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Special Issue Editor

Special Issue Information

Dear Colleagues,

The objective of this Special Issue is to enhance the understanding of the contribution of nutritional and metabolic factors to the health and performance of sports athletes and practitioners. Consequently, we welcome articles focusing on sports athlete and practitioner supplementation, rapid weight loss, nutritional requirements, and their impact on health and performance. Moreover, this Special Issue aims to explore the effects of sports practice and training on human metabolism and energy requirements. Lastly, we are particularly interested in investigations regarding the influence of nutritional interventions on sports athletes' metabolism and how this can impact their health and performance.

Dr. Emerson Franchini
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Metabolites is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

sports
physiology
metabolism
nutrition
rapid weight loss
body mass maintenance
performance
energy system contributions

Published Papers (2 papers)

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Research

Jump to: Review

9 pages, 374 KiB

Open AccessArticle

Effect of Fluid Intake on Acute Changes in Plasma Volume: A Randomized Controlled Crossover Pilot Trial

by Janis Schierbauer, Sabrina Sanfilippo, Auguste Grothoff, Ulrich Fehr, Nadine Wachsmuth, Thomas Voit, Paul Zimmermann and Othmar Moser

Metabolites 2024, 14(5), 263; https://doi.org/10.3390/metabo14050263 - 6 May 2024

Viewed by 268

Abstract

Plasma volume (PV) undergoes constant and dynamic changes, leading to a large intra-day variability in healthy individuals. Hydration is known to induce PV changes; however, the response to the intake of osmotically different fluids is still not fully understood. In a randomized controlled crossover trial, 18 healthy individuals (10 females) orally received an individual amount of an isotonic sodium-chloride (ISO), Ringer (RIN), or glucose (GLU) solution. Hemoglobin mass (Hbmass) was determined with the optimized carbon monoxide re-breathing method. Fluid-induced changes in PV were subsequently calculated based on capillary hemoglobin concentration ([Hb]) and hematocrit (Hct) before and then every 10 minutes until 120 min (t_0–120) after the fluid intake and compared to a control trial arm (CON), where no fluid was administered. Within GLU and CON trial arms, no statistically significant differences from baseline until t₁₂₀ were found (p > 0.05). In the ISO trial arm, PV was significantly increased at t₇₀ (+138 mL, p = 0.01), t₈₀ (+191 mL, p < 0.01), and t₁₁₀ (+182 mL, p = 0.01) when compared to t₀. Moreover, PV in the ISO trial arm was significantly higher at t₇₀ (p = 0.02), t₁₁₀ (p = 0.04), and t₁₂₀ (p = 0.01) when compared to the same time points in the CON trial arm. Within the RIN trial arm, PV was significantly higher between t₇₀ and t₉₀ (+183 mL, p = 0.01) and between t₁₁₀ (+194 mL, p = 0.03) and t₁₂₀ (+186 mL, p < 0.01) when compared to t₀. These results demonstrated that fluids with a higher content of osmotically active particles lead to acute hemodilution, which is associated with a decrease in [Hb] and Hct. These findings underpin the importance of the hydration state on PV and especially on PV constituent levels in healthy individuals. Full article

(This article belongs to the Special Issue Sports: Nutrition and Metabolism in Relation to Athletes’ Health and Performance)

Review

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14 pages, 839 KiB

Open AccessReview

Physiological Perturbations in Combat Sports: Weight Cycling and Metabolic Function—A Narrative Review

by Modesto A. Lebron, Jeffrey R. Stout and David H. Fukuda

Metabolites 2024, 14(2), 83; https://doi.org/10.3390/metabo14020083 - 24 Jan 2024

Viewed by 2071

Abstract

Combat sports athletes seeking a competitive edge often engage in weight management practices to become larger than their opponents, which ultimately includes periods of gradual weight loss, rapid weight loss, and weight regain. This pattern of weight loss and regain is known as weight cycling and often includes periods of low energy availability, making combat sports athletes susceptible to metabolic dysfunction. This narrative review represents an effort to explore the metabolic perturbations associated with weight cycling and outline the short-, medium-, and long-term effects on metabolic flexibility, function, and health. The short-term effects of rapid weight loss, such as a reduced metabolic rate and alterations to insulin and leptin levels, may prelude the more pronounced metabolic disturbances that occur during weight regain, such as insulin resistance. Although definitive support is not currently available, this cycle of weight loss and regain and associated metabolic changes may contribute to metabolic syndrome or other metabolic dysfunctions over time. Full article

(This article belongs to the Special Issue Sports: Nutrition and Metabolism in Relation to Athletes’ Health and Performance)

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