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Article

EMG Amplitude–Force Relationship of Lumbar Back Muscles during Isometric Submaximal Tasks in Healthy Inactive, Endurance and Strength-Trained Subjects

Division of Motor Research, Pathophysiology and Biomechanics, Experimental Trauma Surgery, Department for Hand, Reconstructive, and Trauma Surgery, Jena University Hospital, Friedrich-Schiller University, 07743 Jena, Germany
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Author to whom correspondence should be addressed.
J. Funct. Morphol. Kinesiol. 2023, 8(1), 29; https://doi.org/10.3390/jfmk8010029
Submission received: 23 January 2023 / Revised: 22 February 2023 / Accepted: 22 February 2023 / Published: 23 February 2023

Abstract

Previous data suggest a correlation between the cross-sectional area of Type II muscle fibers and the degree of non-linearity of the EMG amplitude–force relationship (AFR). In this study we investigated whether the AFR of back muscles could be altered systematically by using different training modalities. We investigated 38 healthy male subjects (aged 19–31 years) who regularly performed either strength or endurance training (ST and ET, n = 13 each) or were physically inactive (controls (C), n = 12). Graded submaximal forces on the back were applied by defined forward tilts in a full-body training device. Surface EMG was measured utilizing a monopolar 4 × 4 quadratic electrode scheme in the lower back area. The polynomial AFR slopes were determined. Between-group tests revealed significant differences for ET vs. ST and C vs. ST comparisons at the medial and caudal electrode positions, but not for ET vs. C. Further, systematic main effects of the “electrode position” could be proven for ET and C groups with decreasing x2 coefficients from cranial to caudal and lateral to medial. For ST, there was no systematic main effect of the “electrode position”. The results point towards training-related changes to the fiber-type composition of muscles in the strength-trained participants, particularly for their paravertebral region.
Keywords: trunk muscles; training modality; amplitude–force relationship; human trunk muscles; training modality; amplitude–force relationship; human

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MDPI and ACS Style

Schönau, T.; Anders, C. EMG Amplitude–Force Relationship of Lumbar Back Muscles during Isometric Submaximal Tasks in Healthy Inactive, Endurance and Strength-Trained Subjects. J. Funct. Morphol. Kinesiol. 2023, 8, 29. https://doi.org/10.3390/jfmk8010029

AMA Style

Schönau T, Anders C. EMG Amplitude–Force Relationship of Lumbar Back Muscles during Isometric Submaximal Tasks in Healthy Inactive, Endurance and Strength-Trained Subjects. Journal of Functional Morphology and Kinesiology. 2023; 8(1):29. https://doi.org/10.3390/jfmk8010029

Chicago/Turabian Style

Schönau, Tim, and Christoph Anders. 2023. "EMG Amplitude–Force Relationship of Lumbar Back Muscles during Isometric Submaximal Tasks in Healthy Inactive, Endurance and Strength-Trained Subjects" Journal of Functional Morphology and Kinesiology 8, no. 1: 29. https://doi.org/10.3390/jfmk8010029

APA Style

Schönau, T., & Anders, C. (2023). EMG Amplitude–Force Relationship of Lumbar Back Muscles during Isometric Submaximal Tasks in Healthy Inactive, Endurance and Strength-Trained Subjects. Journal of Functional Morphology and Kinesiology, 8(1), 29. https://doi.org/10.3390/jfmk8010029

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