Cited by 602Exercise and Physiological ResponsesMuscle Physiology and DisordersCardiovascular and exercise physiology

Ultrastructural changes after concentric and eccentric contractions of human muscle

Newham, D.J., McPhail, G., Mills, K.R., Edwards, R.H.T.·1983·Journal of the Neurological Sciences

Abstract

Four normal subjects performed a 20 min step test using a step of the same relative height. During the test the quadriceps muscle of one leg contracted concentrically throughout by stepping up, while the contralateral muscle contracted eccentrically by controlling the step down. Thus both muscles performed the same amount of work. Three subjects had bilateral needle biopsies just prior to exercise. All four had bilateral biopsies immediately after exercise, and 24-48 hours later when the muscles which had contracted eccentrically were painful. The samples were examined by light and electron microscopy. No abnormalities were seen in pre-exercise samples nor after exercise in muscles which had contracted concentrically. The muscles which had contracted eccentrically showed some damage immediately after exercise. In the samples taken 24-48 hours after exercise the damage was more marked and involved a greater percentage of fibres. In view of the known differences between these types of contractions it is suggested that the initial damage is mechanically induced. The exacerbation of damage with time could be due to mechanical or chemical factors.

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Crossref · 10.1016/0022-510x(83)90058-8

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Authors
Newham, D. J., McPhail, G., Mills, K. R., & Edwards, R. H. T.
Affiliations
  • University College London (GB)
  • National Hospital for Neurology and Neurosurgery (GB)
Venue
Journal of the Neurological Sciences
Publisher
Elsevier BV
Published
1983-09
Volume
61
Issue
1
Pages
109-122
ISSN
0022-510X (ISSN-L)
OpenAlex
W2127058444
Cited by
602
References
30
Citations by year
2026: 7 · 2025: 10 · 2024: 7 · 2023: 8 · 2022: 13 · 2021: 13 · 2020: 14 · 2019: 13 · 2018: 12 · 2017: 7 · 2016: 13 · 2015: 19 · 2014: 16 · 2013: 18 · 2012: 29
FWCI
13.22
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of the Neurological Sciences (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
eccentric contraction, concentric contraction, muscle ultrastructure, exercise-induced muscle damage, quadriceps, step test, muscle fiber damage, mechanical damage, chemical injury
MeSH terms
Adult, Biomechanical Phenomena, Biopsy, Physical Exertion, Female, Humans, Male, Microscopy, Electron, Middle Aged, Muscle Contraction, Muscles, Muscular Diseases, Myofibrils

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