Journal Description
Physiologia
Physiologia
is an international, peer-reviewed, open access journal on physiology published quarterly online by MDPI.
- Open Access free for readers, with article processing charges (APC) paid by authors or their institutions.
- High Visibility: indexed within AGRIS, and other databases.
- Rapid Publication: manuscripts are peer-reviewed and a first decision is provided to authors approximately 27.9 days after submission; acceptance to publication is undertaken in 5.8 days (median values for papers published in this journal in the first half of 2024).
- Recognition of Reviewers: APC discount vouchers, optional signed peer review and reviewer names are published annually in the journal.
- Physiologia is a companion journal of Life.
Latest Articles
The Effect of Post-Exercise Warm Water Immersion on Anaerobic Power Performance in College Students
Physiologia 2024, 4(4), 363-372; https://doi.org/10.3390/physiologia4040022 (registering DOI) - 29 Oct 2024
Abstract
Background/Objectives: The purpose of this study was to investigate the effect of a short-term passive post-exercise heat acclimation (HA) protocol on anaerobic performance in college students. Methods: In total, 28 participants (age 22.3 ± 2.1 years, height 168 ± 9.1 cm, mass 71.5
[...] Read more.
Background/Objectives: The purpose of this study was to investigate the effect of a short-term passive post-exercise heat acclimation (HA) protocol on anaerobic performance in college students. Methods: In total, 28 participants (age 22.3 ± 2.1 years, height 168 ± 9.1 cm, mass 71.5 ± 16.6 kg) volunteered and were randomly divided into either an intervention (INT) or control (CON) group. Both groups followed a consecutive two-day protocol, consisting of a 25 min submaximal cycle @ 50–60% heart rate reserve (HRR), followed by a 25 min hot water immersion (INT) or nothing (CON). All participants performed a 30 s Wingate Anaerobic Test (WAnT) on four separate occasions—familiarization, pre-intervention, acutely post-intervention, and 24 h post intervention. The WAnT measured their peak power (W), relative peak power (W/kg), mean power (W), fatigue index (%), and total work (kJ). Results: From the results of the Factorial ANOVA, it was found that there were no significant differences, with no main effect for group (INT vs. CON) or time (Trials 1–4) and no significant interaction across all measured variables (p > 0.05). Conclusions: A two-day post-exercise passive HA protocol utilizing hot water immersion had no significant effect on the measurement of anaerobic performance in college students.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry: 2nd Edition)
►
Show Figures
Open AccessReview
Circulating Extracellular Mitochondria in Cardiometabolic Disease: Harnessing the Potential for Diagnosis, Prognosis, and Treatment
by
Michail Spanos, Priyanka Gokulnath, Olivia Rosina Whittaker, Christopher Azzam, Emeli Chatterjee, Aarush Singh, Dimitrios Varrias, Michail Kladas, Gururaja Vulugundam, Dimitrios Raptis, Hamza Sabir, Zainab Sabir, Saman Zarghom, Amr Aljareh, Steve Kong, Donclair Brown, Guoping Li and Saumya Das
Physiologia 2024, 4(4), 341-362; https://doi.org/10.3390/physiologia4040021 - 14 Oct 2024
Abstract
Mitochondria are crucial for cellular functioning, serving as both an intracellular energy source and a signaling organelle. Recent evidence also highlights their existence outside of cells, where they participate in cell-to-cell communication. Cardiometabolic disease (CMD) has a complex pathogenesis closely associated with mitochondrial
[...] Read more.
Mitochondria are crucial for cellular functioning, serving as both an intracellular energy source and a signaling organelle. Recent evidence also highlights their existence outside of cells, where they participate in cell-to-cell communication. Cardiometabolic disease (CMD) has a complex pathogenesis closely associated with mitochondrial dysregulation, inflammation, and metabolic abnormalities. This review explores the roles of circulating extracellular mitochondria (CEMI) in CMD, detailing how their various forms, whether as intact structures or within vesicles, contribute to CMD pathogenesis. We classify different forms of CEMIs and discuss their potential as biomarkers and therapeutic agents in CMDs. We also describe mitochondrial transplantation as an emerging therapy for restoring cellular function in damaged tissues. Finally, to standardize CEMI assessment, we propose the Universal CEMI Assessment Protocol (UCAP), a framework aimed at enhancing comparability and reproducibility across studies.
Full article
(This article belongs to the Special Issue Feature Papers in Human Physiology–2nd Edition)
►▼
Show Figures
Figure 1
Open AccessReview
The Role of Resistance and Plyometric Training in Firefighter Safety and Performance: A Narrative Review
by
Austin A. Kohler, Andrew R. Moore and Angelia M. Holland-Winkler
Physiologia 2024, 4(4), 327-340; https://doi.org/10.3390/physiologia4040020 - 25 Sep 2024
Abstract
Firefighting is a physically demanding occupation that requires optimal fitness and coordination in addition to other physical and cognitive skills. When firefighters lack the physical fitness necessary to perform their duties, they put themselves and others in danger of injury and even death.
[...] Read more.
Firefighting is a physically demanding occupation that requires optimal fitness and coordination in addition to other physical and cognitive skills. When firefighters lack the physical fitness necessary to perform their duties, they put themselves and others in danger of injury and even death. The heavy, unbreathable personal protective equipment worn to shield firefighters from harmful conditions also promotes overall performance decrements via restricted range of motion as well as energy expenditure and heat-related fatigue. Firefighters are expected to carry other heavy loads, such as hose packs, tools, and victims, while working in hazardous environments. In addition to external load carriage, many firefighters also carry excess body fat that may contribute to poor physical fitness and performance. Therefore, it is imperative to incorporate training strategies to optimize load carriage and improve body composition for improved physical performance during emergencies. Thus, the aims of this narrative review are to (1) explore the impact of firefighter-specific issues on physical performance and safety and (2) identify strategies to assess and optimize occupational performance and safety. Plyometrics; resistance training; and exercise selection, volume, and intensity specifically for improving physical performance in firefighters will be discussed.
Full article
(This article belongs to the Special Issue Resistance Training Is Medicine)
►▼
Show Figures
Figure 1
Open AccessReview
Physiology of Marathon: A Narrative Review of Runners’ Profile and Predictors of Performance
by
Pantelis T. Nikolaidis and Beat Knechtle
Physiologia 2024, 4(3), 317-326; https://doi.org/10.3390/physiologia4030019 - 23 Sep 2024
Abstract
Marathon sports events and those who participate in them have grown over the last years, reflecting notably an augmentation of women and master runners’ participation. The aim of the present narrative review was to briefly present the results of studies on anthropometric, physiological,
[...] Read more.
Marathon sports events and those who participate in them have grown over the last years, reflecting notably an augmentation of women and master runners’ participation. The aim of the present narrative review was to briefly present the results of studies on anthropometric, physiological, and training characteristics, as well as predictors of performance, in marathon runners. It was observed that performance was better in runners with a small body weight, body mass index, body fat percentage, and rate of endomorphy. Regarding physiology, an increased maximal oxygen uptake, anaerobic threshold, and improved running economy could result in a faster race time. The training variables that could predict performance involved weekly training volume (distance) and intensity (running speed), as well as history of training (years). A combination of these three broad categories of characteristics may offer an approximate estimation of the race speed considering that other aspects (e.g., nutrition, biomechanics, and motivation) influence race performance, too. In summary, the findings of the present study provided an overview of the anthropometric, physiological, and training characteristics associated with marathon race times; thus, optimization of any of these characteristics would be expected to improve the race time.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry: 2nd Edition)
Open AccessArticle
Physiological Key Determinants of Elite Open-Water Swimmers
by
Robin Pla, Yannis Raineteau, Xavier Barbier and Anaël Aubry
Physiologia 2024, 4(3), 305-316; https://doi.org/10.3390/physiologia4030018 - 11 Sep 2024
Abstract
This study describes the relationships between different physiological measurements and combinations of critical velocity and performance in elite open-water swimmers. A total of 15 international male open-water swimmers performed a 5 × 200 m front crawl incremental test to estimate maximal aerobic speed
[...] Read more.
This study describes the relationships between different physiological measurements and combinations of critical velocity and performance in elite open-water swimmers. A total of 15 international male open-water swimmers performed a 5 × 200 m front crawl incremental test to estimate maximal aerobic speed (MAS), maximal oxygen consumption (VO2max), the first lactate threshold (VLT1), the second lactate threshold (VLT2), the speed corresponding to 2 mmol/L (V2mmol/L) and to 4 mmol/L (V4mmol/L), and the lactate threshold (VDmax). A 10 km pool trial was also performed to assess swimming performance. Official competition performances in 200, 400, 800, and 1500 m events were collected and were also used to calculate critical velocity (CV) with various combinations of distances. Personal best performances in 1500 m events were 941.76 ± 20.28 s. For the 10 km trial, performance was strongly correlated to VLT1 and moderately to V2mmol/L (r = 0.73 and 0.67, respectively). For the 400, 800, and 1500 m events, strong correlations were observed for V2mmol/L and V4mmol/L. Moderate correlations with these events were also observed for VLT1 and for VDmax (400 and 800 m only). For long-distance swimmers, assessment with a fixed blood lactate value seems to be a good option to estimate swimming performance in distance events. In addition, 10 km performance seems to be more related to the aerobic threshold than the anaerobic threshold.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry: 2nd Edition)
►▼
Show Figures
Figure 1
Open AccessArticle
Isometric Fatigue Resistance of Lumbar Extensors and Cardiovascular Strain in Lower Back Pain Patients Are Associated with Angiotensin-Converting Enzyme and Tenascin-C Gene Polymorphisms
by
Martin Flück, Paola Valdivieso, Marie-Noëlle Giraud and Barry Kim Humphreys
Physiologia 2024, 4(3), 286-304; https://doi.org/10.3390/physiologia4030017 - 31 Aug 2024
Abstract
Background: We tested whether gene polymorphisms for angiotensin-converting enzyme (ACE, rs1799752) and tenascin-C (TNC, rs2104772) are associated with variability in fatigue resistance and metabolic strain during static lumbar exercise through interactions with chronic nonspecific lower back pain and habitual physical exercise levels (PA).
[...] Read more.
Background: We tested whether gene polymorphisms for angiotensin-converting enzyme (ACE, rs1799752) and tenascin-C (TNC, rs2104772) are associated with variability in fatigue resistance and metabolic strain during static lumbar exercise through interactions with chronic nonspecific lower back pain and habitual physical exercise levels (PA). Methods: Forty-eight patients and matched controls performed an isometric endurance test for lumbar extensors. Metabolic strain to longissimus muscle (oxygen saturation, lactate) and cardiovascular system (muscle hemoglobin, blood pressure) and holding time were monitored. Subjects were genotyped for rs1799752 (II, ID, DD) and rs2104772 (AA, AT, TT). Associations of variance with group, genotype, and PA were analyzed under a 5% false discovery rate. Results: The holding time was lower in patients than in controls (150.9 vs. 188.6 s). This difference was associated with both genotypes, as patients with DD-rs1799752-genotype (p = 0.007) and TT-rs2104772-genotype (p = 0.041) showed lower fatigue resistance. Muscle deoxygenation during exercise varied in positive association with the rs2104772-genotype and PA (p = 0.010, η2 = 0.236). Mean arterial blood pressure (p = 0.028, η2 = 0.108) and recovery of hemoglobin concentration (p = 0.003, η2 = 0.907) demonstrated complex group x rs2104772 interactions. Conclusions: Polymorphisms rs1799752 and rs2104772 influence back pain-related variability in lumbar fatigue resistance. rs2104772 was linked to cardiovascular strain during isometric exercise and recovery via muscle perfusion.
Full article
(This article belongs to the Special Issue Advances in Cardiac Physiology and Pathophysiology)
►▼
Show Figures
Figure 1
Open AccessReview
The Impact of Protein in Post-Menopausal Women on Muscle Mass and Strength: A Narrative Review
by
Katherine Elizabeth Black and Penelope Matkin-Hussey
Physiologia 2024, 4(3), 266-285; https://doi.org/10.3390/physiologia4030016 - 31 Jul 2024
Abstract
Background: Menopause is a significant period in the life of a female; many hormonal and lifestyle changes occur, which can have a catastrophic effect on their health and well-being. Amongst these changes is the loss of muscle mass and strength. Resistance training is
[...] Read more.
Background: Menopause is a significant period in the life of a female; many hormonal and lifestyle changes occur, which can have a catastrophic effect on their health and well-being. Amongst these changes is the loss of muscle mass and strength. Resistance training is recommended for post-menopausal women; however, the role of protein in muscle mass and strength in this population is unclear. Methods: This narrative review discusses the research evidence regarding daily protein needs, dose and timings of intake, and protein quality. Results: Observational and interventional studies suggest post-menopausal females should ingest at least the RDA 0.8 g·kg−1·d−1 of protein, the dosing at each meal maybe important. Both whey and soy protein may provide some benefit to muscle strength. Conclusions: Overall, there is limited evidence and not of high quality, making it difficult to make inferences about the protein needs of post-menopausal females.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry)
Open AccessArticle
Comparison of Blood Flow Characteristics in Young Healthy Males between High-Intensity Interval and Moderate-Intensity Continuous Exercise
by
Brett R. Baughman and Brandon J. Sawyer
Physiologia 2024, 4(3), 253-265; https://doi.org/10.3390/physiologia4030015 - 18 Jul 2024
Abstract
Researchers have hypothesized that high-intensity interval exercise (HIIE) and moderate-intensity continuous exercise (MOD) lead to different patterns of shear stress in the brachial artery. These differing patterns of shear stress are thought to partially explain the differing chronic adaptations to these two types
[...] Read more.
Researchers have hypothesized that high-intensity interval exercise (HIIE) and moderate-intensity continuous exercise (MOD) lead to different patterns of shear stress in the brachial artery. These differing patterns of shear stress are thought to partially explain the differing chronic adaptations to these two types of exercise. No study has directly compared blood flow characteristics during HIIE and MOD. Sixteen healthy males (Age: 23 ± 3 years) completed two randomly assigned exercise visits: HIIE (10 × 1 min intervals at 90–95% of HRmax with 1 min of recovery between) or MOD (30 min at 70% of HRmax) on an electronically braked cycle ergometer. Brachial artery blood flow velocity and diameter were measured for a total of 12 min during each of the exercise sessions. Both anterograde blood flow (MOD: 191.3 ± 80.3 mL/min, HIIE: 153.9 ± 67.5 mL/min, p = 0.03) and shear rate (MOD: 203.5 ± 78.1 s−1, HIIE: 170.8 ± 55.5 s−1, p = 0.04) were higher during MOD compared to HIIE. Both retrograde blood flow (MOD: −48.7 ± 21.3 mL/min, HIIE: −63.9 ± 23.3 cm/s, p < 0.01) and shear rate (MOD: −51.5 ± 19.8 s−1, HIIE: −73.8 ± 28.4 s−1, p < 0.01) were of greater magnitude during HIIE compared to MOD. During exercise, brachial artery diameter (p = 0.34) did not differ between HIIE and MOD. Continuous moderate cycling exercise leads to higher brachial artery anterograde shear rate and blood flow, but lower retrograde shear rate and blood flow when compared to high-intensity interval exercise. These differences during exercise in blood flow characteristics could shed light on the differing chronic adaptations to these two types of exercise.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry: 2nd Edition)
►▼
Show Figures
Figure 1
Open AccessArticle
Citrulline Malate Fails to Improve Repeated 300 m Swimming Times in Highly Trained Swimmers
by
Josh W. Newbury, Matthew Cole, Stephen J. Bailey, Adam L. Kelly and Lewis A. Gough
Physiologia 2024, 4(2), 243-252; https://doi.org/10.3390/physiologia4020014 - 13 Jun 2024
Abstract
Citrulline malate (CM) has been touted as a nutritional ergogenic aid for sports performance, with purported mechanisms of increased muscle blood flow, ammonia clearance, and adenosine triphosphate resynthesis. Combined, these physiological benefits may be best applied to whole-body endurance exercises, such as swimming,
[...] Read more.
Citrulline malate (CM) has been touted as a nutritional ergogenic aid for sports performance, with purported mechanisms of increased muscle blood flow, ammonia clearance, and adenosine triphosphate resynthesis. Combined, these physiological benefits may be best applied to whole-body endurance exercises, such as swimming, though this postulate has not yet been explored. In a double-blind, randomised, and crossover design, 11 national-level swimmers (age: 17 ± 3 years, height: 1.71 ± 0.05 m, body mass: 60.6 ± 8.3 kg) from a high-performance swimming club ingested either 15 g CM or a placebo (PLA) 60 min before six × 300 m freestyle bouts (at 4.5 min intervals). Blood lactate, blood pressure, and ratings of perceived exertion were measured at baseline, 60 min post-ingestion, and immediately post-exercise. Neither mean 300 m swimming time (CM: 212.0 ± 9.6 vs. PLA: 212.8 ± 7.7 s, p = 0.683, g = 0.09) nor any individual swimming bouts (p = 0.679, Pŋ2 = 0.02) were improved with CM ingestion. Moreover, no differences in any physiological or subjective measures were identified between conditions (all p > 0.05). Whether the proposed CM mechanisms were active was unclear as more direct physiological measures (i.e., plasma NO, ammonia) may have been required. Resultantly, these observations do not support an ergogenic effect of acute CM ingestion in highly trained swimmers.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry: 2nd Edition)
►▼
Show Figures
Figure 1
Open AccessArticle
Physiological, Perceptual, and Neuromuscular Responses to
by
Pasquale J. Succi, Taylor K. Dinyer-McNeely, Caleb C. Voskuil, Brian Benitez, Minyoung Kwak, Clara J. Mitchinson, Mark G. Abel, Jody L. Clasey and Haley C. Bergstrom
Physiologia 2024, 4(2), 226-242; https://doi.org/10.3390/physiologia4020013 - 27 May 2024
Abstract
Recommendations for endurance exercise prescription are often based on percentages of heart rate (HR) or the volume of oxygen consumption ( O2) maximum or reserve that is extrapolated to a power output (P) or velocity. Previous work has demonstrated
[...] Read more.
Recommendations for endurance exercise prescription are often based on percentages of heart rate (HR) or the volume of oxygen consumption ( O2) maximum or reserve that is extrapolated to a power output (P) or velocity. Previous work has demonstrated dissociations of the expected responses to exercise anchored to the critical heart rate (CHR) compared with the P associated with CHR. However, it is unclear if similar dissociations due to reductions in P to maintain the designated intensity would be present during exercise anchored to the O2 associated with CHR ( O2CHR). The purpose of this study was to examine the patterns in physiological ( O2, HR, P, respiration rate [RR], muscle oxygen saturation [%SmO2]), neuromuscular (electromyographic and mechanomyographic amplitude [EMG AMP, MMG AMP], mean power frequency [EMG MPF, MMG MPF]), and perceptual (rating of perceived exertion [RPE]) responses during exercise at O2CHR ( O2-clamp). On separate days, ten participants (age: 25 ± 4 yr) performed a graded exercise test and four constant P trials at 85–100% of peak P (PP) to derive CHR and O2CHR. Responses were recorded during a trial to exhaustion at O2CHR (32.86 ± 7.12 mL·kg−1·min−1; TLim = 31.31 ± 21.37 min) and normalized in 10% intervals of TLim to their respective values at PP. The one-way repeated-measures ANOVA with post hoc, Bonferroni-corrected, pairwise comparisons indicated differences (p < 0.001) from baseline for HR (mean ± SD %change = 8 ± 3%), RR (43 ± 38%), P (−15 ± 5%), EMG MPF (10 ± 8%), and RPE (65 ± 38%), but no differences (p = 0.077–0.955) for %SmO2 (−17 ± 53%), EMG AMP (−3 ± 16%), MMG AMP (40 ± 61%), and MMG MPF (1 ± 7%). The loss in performance observed during O2-Clamp exercise may provide a quantification of the inefficiency associated with the O2 slow component phenomenon. The neuromuscular responses suggested constant muscle excitation despite the reductions in P, but the metabolic and perceptual responses suggested a combination of feedforward and feedback mechanisms regulating TLim. Future studies should further examine responses to the O2-Clamp exercise at a uniform threshold.
Full article
(This article belongs to the Special Issue Feature Papers in Human Physiology–2nd Edition)
►▼
Show Figures
Figure 1
Open AccessReview
Body Condition in Small Ruminants—Effects of Nutrition on the Hypothalamic–Pituitary–Gonad Axis and Ovarian Activity That Controls Reproduction
by
Ana Sofia Chaves, Filipe Silva, Ramiro Valentim and Hélder Quintas
Physiologia 2024, 4(2), 213-225; https://doi.org/10.3390/physiologia4020012 - 16 May 2024
Abstract
►▼
Show Figures
Nutritional status plays a vital role in regulating ovary activity. This regulation is mediated by the hypothalamus–pituitary–gonad axis and by effects exerted directly on the ovary. Therefore, to achieve the best reproductive performance, it is essential to know how the nutritional status affects
[...] Read more.
Nutritional status plays a vital role in regulating ovary activity. This regulation is mediated by the hypothalamus–pituitary–gonad axis and by effects exerted directly on the ovary. Therefore, to achieve the best reproductive performance, it is essential to know how the nutritional status affects the secretion of GnRH, gonadotrophins, and sex steroid hormones. Adequate body reserves and energy balance are critical for optimal reproductive performance in sheep and goats. However, over- or under-conditioned animals experience issues like extended anestrus, irregular ovarian cycles, and reduced conception. Body condition scoring allows for the evaluation of the relationships between adiposity, nutritional status, and fertility. Acute feed deficits briefly stimulate processes, but chronic restrictions suppress pulsatile LH release, disrupting ovarian function. The process of follicle development is a very complex one which involves intricate interactions between the pituitary gonadotrophins and metabolic hormones as well as between the locally produced factors by the ovarian somatic and germ cells including the IGF system and the TGF-β superfamily members. Genotype and nutrition are factors that have an impact on follicular development, and seasonal factors are also involved. This review will give a brief overview on how the body condition can be evaluated and the effects of nutrition on the hypothalamus–pituitary–gonad axis and ovarian activity, which are responsible for reproductive regulation. This paper presents a clear and reasonable summary of the pathway that runs from the nutritional status of small ruminants to ovarian activity through the hypothalamic–pituitary–gonadal axis. This review summarizes methods for body condition evaluation in small ruminants and evidence regarding acute versus prolonged nutritional impacts on the hypothalamic–pituitary–gonadal axis and ovarian activity controlling reproduction.
Full article
Figure 1
Open AccessReview
Exercise Physiology: A Review of Established Concepts and Current Questions
by
Michael J. Matthews, Shibani Kanungo, Robert J. Baker and Keith Kenter
Physiologia 2024, 4(2), 202-212; https://doi.org/10.3390/physiologia4020011 - 30 Apr 2024
Abstract
Exercise physiology is the science that studies the processes of physical activity and their impact on the body. It usually requires a multidisciplinary approach with a team of experts because of the multiple physiological systems involved. At the cellular level, exercise can trigger
[...] Read more.
Exercise physiology is the science that studies the processes of physical activity and their impact on the body. It usually requires a multidisciplinary approach with a team of experts because of the multiple physiological systems involved. At the cellular level, exercise can trigger a cascade of events that involve metabolic pathways, muscle recruitment and conditioning, neuromuscular adaptations, and optimization of energy production. On a systematic level, this has involved the cardiovascular system, the respiratory system, the musculoskeletal system, the peripheral and central nervous systems, and even the endocrine system to improve adaptation to meet the demands of exercise, improving strength and endurance with the goal of maximizing performance. This field, which began largely with a focus on the kinetics of oxygen consumption and the relationship between aerobic and anaerobic metabolism, has expanded with technological advancements such as wearable devices, advanced imaging techniques, and genomics, which has allowed for a greater appreciation of the physiologic responses of exercise at the level of molecular and cellular interactions. Recently, this science has evolved into the study of overall health promotion and disease prevention to meet individual fitness needs and goals. This philosophy, which is captured by the motto “Exercise is Medicine”, has been adopted as a Global Health Initiative by the World Health Organization (WHO). Despite the advancements in technology and impactful, large-scale studies, a variety of questions, such as how physical activity interacts with aging to affect physical and cognitive function, how inactivity influences acute and chronic disease states, and how we maximize human performance in extreme conditions like microgravity environments, remain. The purpose of this review is to present and discuss established concepts, controversial topics, and unanswered questions within exercise physiology that have allowed this field to become a science that embraces the overall well-being of individuals.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry)
►▼
Show Figures
Figure 1
Open AccessReview
Understanding and Modeling the Pathophysiology of Hydrocephalus: In Search of Better Treatment Options
by
Verayna Newland, Lauren L. Jantzie and Bonnie L. Blazer-Yost
Physiologia 2024, 4(2), 182-201; https://doi.org/10.3390/physiologia4020010 - 17 Apr 2024
Abstract
Hydrocephalus is caused by an overproduction of cerebrospinal fluid (CSF), an obstruction of fluid movement, or improper reabsorption. CSF accumulation in the brain’s ventricles causes ventriculomegaly, increased intracranial pressure, inflammation, and neural cell injury. Hydrocephalus can arise from brain trauma, hemorrhage, infection, tumors,
[...] Read more.
Hydrocephalus is caused by an overproduction of cerebrospinal fluid (CSF), an obstruction of fluid movement, or improper reabsorption. CSF accumulation in the brain’s ventricles causes ventriculomegaly, increased intracranial pressure, inflammation, and neural cell injury. Hydrocephalus can arise from brain trauma, hemorrhage, infection, tumors, or genetic mutations. Currently, there is no cure for hydrocephalus. Treatments like shunting and endoscopic third ventriculostomies are used, but, unfortunately, these therapeutic approaches require brain surgery and have high failure rates. The choroid plexus epithelium (CPe) is thought to be the major producer of CSF in the brain. It is a polarized epithelium that regulates ion and water movement from a fenestrated capillary exudate to the ventricles. Despite decades of research, control of electrolyte movement in the CPe is still not fully understood. This review discusses important transporters on the CPe, how some of these are regulated, and which of them could be potential targets for hydrocephalus treatment. To advance the development of hydrocephalus treatments, physiologically relevant preclinical models are crucial. This review covers some of the current animal and cell culture methods used to study hydrocephalus and highlights the need to develop standardized preclinical models that are used by multiple investigators in order to replicate critical findings and resolve controversies regarding potential drug targets.
Full article
(This article belongs to the Section Exercise Physiology)
►▼
Show Figures
Figure 1
Open AccessReview
Identification of Putative Causal Relationships between Blood-Based Biomarkers and Prediabetes-Induced Senescence: A Comprehensive Review
by
Nonkululeko Avril Mbatha, Aganze Gloire-Aimé Mushebenge and Andile Khathi
Physiologia 2024, 4(2), 149-181; https://doi.org/10.3390/physiologia4020009 - 8 Apr 2024
Abstract
Prediabetes, a pivotal phase in glucose metabolism between normalcy and diabetes, exerts a profound influence on the aging process and the risk of age-related diseases. This comprehensive review delves into the intricate web of blood-based biomarkers that collectively expedite senescence, marking the transition
[...] Read more.
Prediabetes, a pivotal phase in glucose metabolism between normalcy and diabetes, exerts a profound influence on the aging process and the risk of age-related diseases. This comprehensive review delves into the intricate web of blood-based biomarkers that collectively expedite senescence, marking the transition from a state of health to age-related complications. Key findings underscore the significance of diverse biomarkers, such as telomere length, p16INK4a, senescence-associated secretory phenotype (SASP) factors, DNA methylation clocks, advanced glycation end products (AGEs), inflammatory and oxidative stress markers, circulating hormones, and additional factors such as folate, B12, and osteocalcin. Not only do these biomarkers serve as indicators of senescence but they also actively fuel chronic inflammation, oxidative stress, and metabolic dysregulation, all of which contribute to accelerated aging. The implications of this understanding are profound, as prediabetes emerges as a critical period in an individual’s life, influencing various physiological systems, including the vascular and neural systems, metabolic functions, hormonal regulation, and bone health. Recognizing the profound influence of prediabetes on senescence provides a foundation for personalized intervention strategies to mitigate age-related complications and promote healthy aging. Future research directions call for a more diverse array of biomarkers, the in-depth exploration of their roles, and the development of tailored precision medicine strategies to ensure a holistic understanding and effective management of prediabetes-induced senescence and its implications for aging. This knowledge has far-reaching implications for public health and clinical practice, emphasizing the need for early detection and intervention in prediabetic individuals to enhance the quality of life in an aging population with diverse needs.
Full article
(This article belongs to the Special Issue Feature Papers in Human Physiology–2nd Edition)
►▼
Show Figures
Figure 1
Open AccessBrief Report
Lightness Peaks during the Menstrual Phase: A Retrospective Challenge to a Visual Arousal Theory of Estrogen
by
Brian Foutch
Physiologia 2024, 4(2), 139-148; https://doi.org/10.3390/physiologia4020008 - 25 Mar 2024
Abstract
(1) Background: The influence of estrogen on cognitive and perceptual functions is debated. Some research suggests that estrogen increases arousal, improving cognitive function, while others propose that increased arousal might reduce performance in certain tasks. This study investigates the effects of menstrual cycle
[...] Read more.
(1) Background: The influence of estrogen on cognitive and perceptual functions is debated. Some research suggests that estrogen increases arousal, improving cognitive function, while others propose that increased arousal might reduce performance in certain tasks. This study investigates the effects of menstrual cycle phase and estrogen levels on lightness perception in cycling women and hormonal contraceptive (HC) users. (2) Methods: Sixteen women (nine with natural cycles and seven HC users) completed three sessions aligned with different menstrual cycle phases. During these sessions, participants adjusted the luminance of five test stimuli (representing blue, green, green-yellow, yellow, and red) until they matched a flickering reference white stimulus. Lightness was calculated as the ratio of the reference stimulus luminance (5 cd/m2) divided by the test luminance required to match. Estrogen levels were also determined for each participant from saliva samples collected on the morning of each session. The effects of wavelength and menstrual cycle phase on lightness perception were analyzed, followed by post hoc comparisons and correlations between lightness perception and estrogen levels for both cycling women and HC users. (3) Results: Lightness varied by menstrual phase (MCP) in cycling women and was slightly higher during the low estrogen menstrual phase compared to peri-ovulation or luteal phases. In HC users, lightness measures were equivalent across phases. For cycling women, lightness was negatively correlated with estrogen for the green and green-yellow stimuli. There were no such associations among HC users. (4) Conclusions: This report challenges the concept that high estrogen phases of the menstrual cycle always positively influence perception. Conversely, these results revealed that—at least in cycling, non-hormonal contraceptive users—lightness perception was both at a maximum during the low estrogen menstrual phase and negatively associated with estrogen levels across all tested wavelengths.
Full article
(This article belongs to the Special Issue Feature Papers in Human Physiology–2nd Edition)
►▼
Show Figures
Figure 1
Open AccessReview
Healthy Aging in Menopause: Prevention of Cognitive Decline, Depression and Dementia through Physical Exercise
by
Carmen Guerrero-González, Cristina Cueto-Ureña, Vanesa Cantón-Habas, María Jesús Ramírez-Expósito and José Manuel Martínez-Martos
Physiologia 2024, 4(1), 115-138; https://doi.org/10.3390/physiologia4010007 - 7 Mar 2024
Cited by 1
Abstract
The aging of the global population is a significant and complex phenomenon with far-reaching implications for healthcare systems and society. By 2030, it is projected that the number of individuals over the age of 65 will increase by nearly 1 billion, largely due
[...] Read more.
The aging of the global population is a significant and complex phenomenon with far-reaching implications for healthcare systems and society. By 2030, it is projected that the number of individuals over the age of 65 will increase by nearly 1 billion, largely due to advancements in healthcare and improvements in quality of life. Aging is a multifaceted process that encompasses a wide array of changes, spanning from the cellular level to the intricate physiological systems of the human body. At the central nervous system level, aging represents a major risk factor for conditions such as depression and cognitive impairment, which are likely linked to neuroinflammatory processes and can potentially lead to more severe dementias, including Alzheimer’s disease (AD). The higher prevalence of AD in women compared to men has led to speculation that the onset of menopause and associated phenomena, particularly the decline in estrogen levels, may play a role in the development of the disease. Furthermore, research has shown that physical exercise confers both physical and mental health benefits to older adults, with women potentially experiencing the greatest advantages. Understanding the multifaceted nature of aging and its implications for health will ensure that older adults receive the support and care essential for maintaining their health and quality of life.
Full article
(This article belongs to the Section Exercise Physiology)
►▼
Show Figures
Figure 1
Open AccessArticle
Decrease in Leptin Expression in the Liver after Prolonged Every-Other-Day Feeding in C57Bl/6 Male Mice
by
Katarzyna Piotrowska, Maciej Tarnowski, Patrycja Tomasiak, Michał Czerewaty, Katarzyna Zgutka and Andrzej Pawlik
Physiologia 2024, 4(1), 100-114; https://doi.org/10.3390/physiologia4010006 - 17 Feb 2024
Abstract
►▼
Show Figures
Background: The positive effects of prolonged every-other-day (EOD) feeding include decreased body weight and prolonged life span, but also changes in liver metabolism and functions. In the present paper, our aim was to examine the expression of adiponectin (ADIPOQ), leptin, and their receptors
[...] Read more.
Background: The positive effects of prolonged every-other-day (EOD) feeding include decreased body weight and prolonged life span, but also changes in liver metabolism and functions. In the present paper, our aim was to examine the expression of adiponectin (ADIPOQ), leptin, and their receptors (ADIPOR1, ADIPOR2, and LEPR) in the liver tissue of EOD-fed mice in comparison to ad libitum (AL)-treated mice. Methods: After 9 months of EOD treatment, liver tissue was harvested and prepared for analysis. RT-PCR, protein semi-quantitative estimation, and cellular immunolocalization was performed. Results: We noted a decreased expression of leptin in the liver tissue of the EOD male mice in comparison to the AL mice on the protein level. ADIPOQ receptor R1 protein expression was decreased in the liver of EOD-fed male mice, while the expression of ADIPOR2 on the protein level was increased in the EOD animals. Conclusions: To the best of our knowledge, this is the first report showing ADIPOQ and leptin immunolocalization in the liver tissue in a dietary regime experiment. Decreases in leptin expression and IL-6 expression in liver tissue and increases in ADIPOR2 expression may be partly responsible for the beneficial effects of EOD treatment in the liver, including the decrease in inflammation. Further studies are needed to establish whether these changes depend on factors like the type of treatment, species, strain, gender, time of treatment, and others.
Full article
Figure 1
Open AccessReview
The Past, Present, Future: Pathophysiology, Diagnosis, and Treatment of Human Skin Diseases
by
Niki Ebrahimnejad, Duaa Jaafar and Heidi Goodarzi
Physiologia 2024, 4(1), 81-99; https://doi.org/10.3390/physiologia4010005 - 8 Feb 2024
Abstract
When thinking of skin disease, cancer comes up almost immediately as an example. While the American Cancer Society lists 6 major cancer types, the National Institute of Arthritis and Musculoskeletal and Skin Diseases identifies 13 significant benign skin disorders, reflecting the diversity of
[...] Read more.
When thinking of skin disease, cancer comes up almost immediately as an example. While the American Cancer Society lists 6 major cancer types, the National Institute of Arthritis and Musculoskeletal and Skin Diseases identifies 13 significant benign skin disorders, reflecting the diversity of skin conditions in dermatology. This topical review aims to provide an overview of the pathophysiology of these major skin cancers and disorders and to summarize conventional diagnostic methods and current treatment approaches.
Full article
(This article belongs to the Special Issue Feature Papers in Human Physiology–2nd Edition)
►▼
Show Figures
Figure 1
Open AccessArticle
Heat Stress but Not Capsaicin Application Alleviates the Hypertensive Response to Isometric Exercise
by
Alexandros Sotiridis, Anastasios Makris, Maria D. Koskolou and Nickos D. Geladas
Physiologia 2024, 4(1), 64-80; https://doi.org/10.3390/physiologia4010004 - 23 Jan 2024
Abstract
►▼
Show Figures
Heat stress and cutaneous capsaicin application act independently to reduce mean arterial blood pressure (MAP) at rest. The present study investigated whether a mixed intervention might alleviate to a greater extent the hypertensive response to isometric exercise. An end-exercise systolic blood pressure (SBP)
[...] Read more.
Heat stress and cutaneous capsaicin application act independently to reduce mean arterial blood pressure (MAP) at rest. The present study investigated whether a mixed intervention might alleviate to a greater extent the hypertensive response to isometric exercise. An end-exercise systolic blood pressure (SBP) lower than 215 mmHg or higher than 220 mmHg was set for the inclusion in the group observed with typical (CON, n = 9) or hypertensive (HRE, n = 8) response to dynamic exercise, respectively. The participants performed four trials held in thermoneutral (TN:23 °C) or hot (HT:33 °C) conditions with capsaicin (CA:4.8 mg·patch−1) or placebo (PL) patches (12 × 18 cm2) applied to their two quadriceps, left pectoralis major and left scapula. The trials comprised: a 5 min baseline period preceding patch application, a 30 min rest period and a 5 min isometric handgrip exercise (20% maximal voluntary contraction, 10.1 ± 1.9 kg). Thermoregulatory and cardiovascular data were analyzed using mixed three-way ANOVA. End-resting MAP and pain sensation were higher in PL-TN (p = 0.008) and CA-HT (p = 0.012), respectively. End-exercise SBP tended to be higher in HRE individuals across environments (p = 0.10). Total peripheral resistance and MAP remained lower in HT across groups (p < 0.05). Despite the alleviating effect of the heat stressor, an augmented burning sensation-induced peripheral vasoconstriction might have blunted the pressure-lowering action of capsaicin.
Full article
Figure 1
Open AccessArticle
Essential Fatty Acid Associated with Heart Rate Variability in Highly Trained Male Cross-Country Skiers: A Pilot Study
by
Aleksandra Y. Lyudinina, Alexander L. Markov and Evgeny R. Bojko
Physiologia 2024, 4(1), 54-63; https://doi.org/10.3390/physiologia4010003 - 19 Jan 2024
Cited by 1
Abstract
Polyunsaturated fatty acid (PUFA) metabolites play important roles in the modulation of vascular tone, heart rate variability (HRV), and cardiovascular diseases. This study was undertaken to examine the relationship between HRV and the plasma levels of essential acids. Methods: Highly trained cross-country skiers
[...] Read more.
Polyunsaturated fatty acid (PUFA) metabolites play important roles in the modulation of vascular tone, heart rate variability (HRV), and cardiovascular diseases. This study was undertaken to examine the relationship between HRV and the plasma levels of essential acids. Methods: Highly trained cross-country skiers participated in the study (n = 19). Time-domain and frequency-domain HRV analyses were performed. The plasma levels of fatty acids were determined using gas–liquid chromatography. Results: Plasma eicosapentaenoic acid and docosahexaenoic acid were found to be negatively correlated with resting heart rate (HR) (p = 0.026). The plasma levels of alpha-linolenic acid (ALA) were positively associated with the relative value of high-frequency power (rs = 0.465, p = 0.045) and negatively correlated with the sympathovagal balance ratio (rs = −0.493, p = 0.032) and the absolute and relative values of low-frequency power (rs = −0.490, p = 0.028). The plasma levels of arachidonic acid (ARA) were positively associated with the relative value of high-frequency power (rs = 0.59, p = 0.006) and negatively correlated with the sympathovagal balance ratio (rs = −0.54, p = 0.017) and the relative values of low-frequency power (rs = −0.52, p = 0.022). No correlation was found between n6/n3 and HRV parameters except for HR and pNN50. Conclusions: n-3 PUFAs and ARA play an important role in the autonomic regulation of heart rate in highly trained skiers. Athletes with substantial deficiencies in plasma ALA and excess levels of ARA had increased sympathetic and decreased parasympathetic activity.
Full article
(This article belongs to the Special Issue Exercise Physiology and Biochemistry)
►▼
Show Figures
Figure 1
Highly Accessed Articles
Latest Books
E-Mail Alert
News
Topics
Topic in
Agriculture, Animals, Applied Biosciences, Metabolites, Physiologia, Dairy, Pets
New Perspectives on Metabolism and Metabolic Disease in Wildlife, Domestic, and Exotic Pets and Livestock
Topic Editors: Filipe da Costa Silva, Isabel PiresDeadline: 3 July 2027
Conferences
Special Issues
Special Issue in
Physiologia
The Brain Barriers: Functions and Their Implications
Guest Editors: Ana Catarina Duarte, Telma QuintelaDeadline: 30 December 2024
Special Issue in
Physiologia
Resistance Training Is Medicine
Guest Editor: Daniel J. McDonoughDeadline: 31 December 2024
Special Issue in
Physiologia
Exercise Physiology and Biochemistry: 2nd Edition
Guest Editors: Michael Koutsilieris, Anastassios PhilippouDeadline: 31 January 2025
Special Issue in
Physiologia
Update on the Regulation Networks of the Circadian Clock in Plants
Guest Editor: Mathias FooDeadline: 31 March 2025