Effects of wrist position on eccentric exercise-induced muscle damage of the elbow flexors
Document Type
Journal Article
Publication Title
Scandinavian Journal of Medicine & Science in Sports
Volume
31
Issue
6
First Page
1290
Last Page
1300
Publisher
Wiley
School
School of Medical and Health Sciences / Centre for Exercise and Sports Science Research
RAS ID
36894
Abstract
We tested the hypothesis that the magnitude of changes in indirect muscle damage markers would be greater after maximal elbow flexor eccentric exercise in the supinated (shorter biceps brachii) than neutral wrist (longer) position, and the difference in the magnitude would be associated with greater elongation over contractions for the supinated than neutral position, rather than the initial muscle length. Ten untrained men (21-39 years) performed two bouts of 10 sets of 6 maximal isokinetic eccentric contractions of the elbow flexors in the supinated position for one arm and neutral position for the other arm separated by 2 weeks in a randomized order. Biceps brachii myotendinous junction (MTJ) movements during eccentric contractions were recorded by B-mode ultrasonography, and the displacement from the start to end of each contraction was quantified. Peak torque (supinated: 367.8 ± 112.5 Nm, neutral: 381.5 ± 120.4 Nm) and total work (1816 ± 539 J, 1865 ± 673 J) produced during eccentric contractions were similar between conditions. The average MTJ displacement increased (P < .05) from the 1st set (8.0 ± 2.0 mm) to 10th set (15.8 ± 1.9 mm) for the supinated condition, but no such increase was found in the neutral condition (1st set: 5.1 ± 1.0 mm, 10th set: 5.0 ± 0.8 mm). Changes in indirect muscle damage markers (maximal voluntary isometric contraction torque, range of motion, serum creatine kinase activity, and muscle soreness) after exercise were greater (P < .05) for the supinated than neutral condition. These results suggest that the greater muscle damage marker changes for the supinated than neutral wrist position was associated with the greater muscle lengthening (strain).
DOI
10.1111/sms.13936
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Comments
Lau, W. Y., Blazevich, A. J., Newton, M. J., Wu, S. S. X., & Nosaka, K. (2021). Effects of wrist position on eccentric exercise‐induced muscle damage of the elbow flexors. Scandinavian Journal of Medicine & Science in Sports, 31(6), 1290-1300. https://doi.org/10.1111/sms.13936