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Cited by 310

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Changes in human skeletal muscle ultrastructure and force production after acute resistance exercise

Gibala, M. J., MacDougall, J. D., Tarnopolsky, M. A., Stauber, W. T., Elorriaga, A.·1995·Journal of Applied Physiology
DOI 10.1152/jappl.1995.78.2.702
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Abstract

Muscle ultrastructure and contractile properties were examined before and after a single bout of resistance exercise (8 sets of 8 repetitions at 80% of 1 repetition maximum). Eight untrained males performed the concentric (Con) phase of arm-curl exercise with one arm and the eccentric (Ecc) phase with the other arm. Needle biopsies were obtained from biceps brachii before exercise (Base), immediately postexercise from each arm (post-Con and post-Ecc), and 48 h postexercise from each arm (48 h-Con and 48 h-Ecc). Electron microscopy was used to quantify the presence of disrupted fibers in each sample. Analysis of variance revealed a greater (P < or = 0.05) proportion of disrupted fibers in post-Con, post-Ecc, 48 h-Con, and 48 h-Ecc samples compared with Base. Significantly more fibers were disrupted in post-Ecc (82%) and 48 h-Ecc (80%) samples compared with post-Con (33%) and 48 h-Con (37%), respectively. Voluntary and evoked strength measurements recovered to Base values within 24 h in the Con arm but remained depressed (P < or = 0.05) for 72–96 h in the Ecc arm. These data indicate that both the raising and lowering phases of weightlifting produced myofibrillar disruption, with the greatest disruption occurring during the lowering phase.

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Authors
Gibala, M. J., MacDougall, J. D., Tarnopolsky, M. A., Stauber, W. T., & Elorriaga, A.
Venue
Journal of Applied Physiology
Publisher
American Physiological Society
Published
1995-02-01
Volume
78
Issue
2
Pages
702-708
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
DOI
10.1152/jappl.1995.78.2.702
OpenAlex
W2098483586
Cited by
310
References
0
FWCI
7.47
Type
journal article
Language
en
Open access
closed

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