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Sex comparisons of non-local muscle fatigue in human elbow flexors and knee extensors.
J Musculoskelet Neuronal Interact. 2018 03 01; 18(1):92-99.JM

Abstract

OBJECTIVES

To examine non-local muscle fatigue (NLMF) in both contralateral homologous and non-related heterogonous muscles for both sexes.

METHODS

Ten men and nine women participated in this study. After the familiarization visit, subjects completed four separate randomly sequenced experimental visits, during which the fatiguing interventions (six sets of 30-second maximal isometric contractions) were performed on either their right elbow flexors or knee extensors. Before (Pre-) and after (Post-) the fatiguing interventions, the isometric strength and the corresponding surface electromyographic (EMG) amplitude were measured for the non-exercised left elbow flexors or knee extensors.

RESULTS

For the non-exercised elbow flexors, the isometric strength decreased for both sexes (sex combined mean±SE: Pre vs. Post=339.67±18.02 N vs. 314.41±16.37 N; p⟨0.001). For the non-exercised knee extensors, there is a time × sex interaction (p=0.025), showing a decreased isometric knee extension strength for men (Pre vs. Post =845.02±66.26 N vs. 817.39±67.64 N; p=0.019), but not for women.

CONCLUSIONS

The presence of NMLF can be affected by factors such as sex and muscle being tested. Women are less likely to demonstrate NLMF in lower body muscle groups.

Authors+Show Affiliations

The University of Mississippi, Department of Health, Exercise Science, and Recreation Management, University, MS 38677, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29504584

Citation

Ye, Xin, et al. "Sex Comparisons of Non-local Muscle Fatigue in Human Elbow Flexors and Knee Extensors." Journal of Musculoskeletal & Neuronal Interactions, vol. 18, no. 1, 2018, pp. 92-99.
Ye X, Beck TW, Wages NP, et al. Sex comparisons of non-local muscle fatigue in human elbow flexors and knee extensors. J Musculoskelet Neuronal Interact. 2018;18(1):92-99.
Ye, X., Beck, T. W., Wages, N. P., & Carr, J. C. (2018). Sex comparisons of non-local muscle fatigue in human elbow flexors and knee extensors. Journal of Musculoskeletal & Neuronal Interactions, 18(1), 92-99.
Ye X, et al. Sex Comparisons of Non-local Muscle Fatigue in Human Elbow Flexors and Knee Extensors. J Musculoskelet Neuronal Interact. 2018 03 1;18(1):92-99. PubMed PMID: 29504584.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sex comparisons of non-local muscle fatigue in human elbow flexors and knee extensors. AU - Ye,Xin, AU - Beck,Travis W, AU - Wages,Nathan P, AU - Carr,Joshua C, PY - 2018/3/6/entrez PY - 2018/3/6/pubmed PY - 2019/10/1/medline SP - 92 EP - 99 JF - Journal of musculoskeletal & neuronal interactions JO - J Musculoskelet Neuronal Interact VL - 18 IS - 1 N2 - OBJECTIVES: To examine non-local muscle fatigue (NLMF) in both contralateral homologous and non-related heterogonous muscles for both sexes. METHODS: Ten men and nine women participated in this study. After the familiarization visit, subjects completed four separate randomly sequenced experimental visits, during which the fatiguing interventions (six sets of 30-second maximal isometric contractions) were performed on either their right elbow flexors or knee extensors. Before (Pre-) and after (Post-) the fatiguing interventions, the isometric strength and the corresponding surface electromyographic (EMG) amplitude were measured for the non-exercised left elbow flexors or knee extensors. RESULTS: For the non-exercised elbow flexors, the isometric strength decreased for both sexes (sex combined mean±SE: Pre vs. Post=339.67±18.02 N vs. 314.41±16.37 N; p⟨0.001). For the non-exercised knee extensors, there is a time × sex interaction (p=0.025), showing a decreased isometric knee extension strength for men (Pre vs. Post =845.02±66.26 N vs. 817.39±67.64 N; p=0.019), but not for women. CONCLUSIONS: The presence of NMLF can be affected by factors such as sex and muscle being tested. Women are less likely to demonstrate NLMF in lower body muscle groups. SN - 1108-7161 UR - https://www.unboundmedicine.com/medline/citation/29504584/Sex_comparisons_of_non_local_muscle_fatigue_in_human_elbow_flexors_and_knee_extensors_ L2 - http://www.ismni.org/jmni/pdf/71/jmni_18_092.pdf DB - PRIME DP - Unbound Medicine ER -