Cited by 81Muscle activation and electromyography studiesCardiovascular and exercise physiologyMuscle Physiology and Disorders

Power loss is greater in old men than young men during fast plantar flexion contractions

Dalton, Brian H., Power, Geoffrey A., Vandervoort, Anthony A., Rice, Charles L.·2010·Journal of Applied Physiology

Abstract

It is unclear during human aging whether healthy older adults (>70 yr old) experience greater, lesser, or the same fatigability compared with younger adults. The reported disparate findings may be related to the task-dependent nature of fatigue and the limited number of studies exploring nonisometric contractile function and aging. The purpose here was to determine the effects of fast shortening contractions on the fatigability of the triceps surae in 10 young (∼24 yr old) and 10 old (∼78 yr old) men using isometric and dynamic measures. Participants performed 50 maximal velocity-dependent plantar flexions at a constant load of 20% maximal voluntary isometric contraction (MVC). Isometric twitch properties and MVCs were tested at baseline and during and following the fatigue task. Voluntary activation was similar between the old and young (∼98%) and was unaltered with fatigue. The old had 26% lower ( P < 0.01) isometric MVC torque and 18% slower ( P < 0.01) maximal shortening velocity than the young. Hence, peak power was 38% lower in the old ( P < 0.01). At task termination, MVC torque was maintained in the old ( P = 0.15) but decreased by 21% in the young ( P < 0.01). Twitch half-relaxation time was lengthened in the old at task termination by 26% ( P < 0.01) but unchanged in the young ( P = 0.10). Peak power was reduced by 24% and 17% at task termination in the old and young, respectively ( P < 0.01). Despite a better maintenance in isometric MVC torque production, the weaker and slower contracting triceps surae of the old was more fatigable than the young during fast dynamic efforts with an unconstrained velocity.

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Crossref · 10.1152/japplphysiol.00335.2010

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Authors
Dalton, B. H., Power, G. A., Vandervoort, A. A., & Rice, C. L.
Affiliations
Western University (CA)
Corresponding author
Rice, Charles L.
Venue
Journal of Applied Physiology
Published
2010-11
Volume
109
Issue
5
Pages
1441-1447
ISSN
  • 0161-7567 (ISSN-L)
  • 8750-7587
  • 1522-1601
OpenAlex
W2108256304
Cited by
81
References
43
Citations by year
2026: 3 · 2025: 4 · 2024: 4 · 2023: 5 · 2022: 5 · 2021: 4 · 2020: 7 · 2019: 8 · 2018: 3 · 2017: 5 · 2016: 5 · 2015: 8 · 2014: 4 · 2013: 6 · 2012: 6
FWCI
3.02
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Physical Sciences › Engineering › Biomedical Engineering › Muscle activation and electromyography studies
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Muscle Physiology and Disorders
Keywords
aging, muscle fatigue, triceps surae, plantar flexion, muscle power, isometric torque, voluntary activation, older men
MeSH terms
Action Potentials, Adult, Age Factors, Aged, Aging, Biomechanical Phenomena, Electric Stimulation, Electromyography, Humans, Isometric Contraction, Leg, Male, Time Factors, Muscle, Skeletal, Muscle Fatigue, Torque, Muscle Strength, Young Adult

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