Document Detail


Sex differences in fatigue resistance are muscle group dependent.
MedLine Citation:
PMID:  20195184     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
PURPOSE: Women are often reported to be generally more resistant to fatigue than men for relative-intensity tasks. This has been observed repeatedly for elbow flexors, whereas at the ankle, sex differences appear less robust, suggesting localized rather than systemic influences. Thus, the purpose of this study was to examine sex differences in fatigue resistance at muscle groups in a single cohort and which factors, if any, predict endurance time.
METHODS: Thirty-two young adults (age = 19-44 yr, 16 women) performed sustained isometric contractions at 50% maximum voluntary isometric contraction to failure for elbow flexion and ankle dorsiflexion. Pain, exertion, and muscle EMG were assessed throughout. Self-reported baseline activity was measured using the International Physical Activity Questionnaire.
RESULTS: Women were significantly more resistant to fatigue than men at the elbow (112.3 ± 6.2 vs 80.3 ± 5.8 s, P = 0.001) but not at the ankle (140.6 ± 10.7 vs 129.2 ± 10.5 s, P = 0.45). Peak torque was greater in men than that in women (P < 0.0001) at the ankle (45.0 ± 1.7 vs 30.1 ± 1.0 N·m) and at the elbow (75.7 ± 3.1 vs 34.4 ± 2.2 N·m). Peak torque was significantly related to endurance time at the elbow (R2= 0.30) but not at the ankle (R2 = 0.03). Peak pain, rate of pain increase, peak exertion, EMG, and baseline physical activity did not differ between sexes.
CONCLUSIONS: Sex differences in fatigue resistance are muscle group specific. Women were more fatigue resistant at the elbow but not at the ankle during a sustained isometric contraction. Further, factors that may contribute to fatigue resistance for one muscle group (e.g., sex, peak torque) may not be critical at another.
Authors:
Keith G Avin; Maureen R Naughton; Brett W Ford; Haley E Moore; Maya N Monitto-Webber; Amy M Stark; A John Gentile; Laura A Frey Law
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Medicine and science in sports and exercise     Volume:  42     ISSN:  1530-0315     ISO Abbreviation:  Med Sci Sports Exerc     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-09-21     Completed Date:  2011-01-13     Revised Date:  2014-09-05    
Medline Journal Info:
Nlm Unique ID:  8005433     Medline TA:  Med Sci Sports Exerc     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1943-50     Citation Subset:  IM; S    
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MeSH Terms
Descriptor/Qualifier:
Adult
Ankle / physiology
Cohort Studies
Elbow / physiology
Female
Humans
Isometric Contraction / physiology
Male
Motor Activity / physiology
Muscle Fatigue / physiology*
Muscle, Skeletal / physiology
Pain / physiopathology
Physical Endurance / physiology*
Sex Factors
Torque
Young Adult
Grant Support
ID/Acronym/Agency:
1K01AR056134/AR/NIAMS NIH HHS; F31 AR056175/AR/NIAMS NIH HHS; K01 AR056134/AR/NIAMS NIH HHS; K12 HD055931/HD/NICHD NIH HHS; K12 HD055931/HD/NICHD NIH HHS
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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