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Comparison of neuromuscular adjustments associated with sustained isometric contractions of four different muscle groups.
J Appl Physiol (1985). 2013 May 15; 114(10):1426-34.JA

Abstract

The extent and characteristics of muscle fatigue of different muscle groups when subjected to a similar fatiguing task may differ. Thirteen healthy young men performed sustained contractions at 50% maximal voluntary contraction (MVC) force until task failure, with four different muscle groups, over two sessions. Per session, one upper limb and one lower limb muscle group were tested (knee extensors and thumb adductor, or plantar and elbow flexors). Changes in voluntary activation level and contractile properties were derived from doublet responses evoked during and after MVCs before and after exercise. Time to task failure differed (P < 0.05) between muscle groups (220 ± 64 s for plantar flexors, 114 ± 27 s for thumb adductor, 77 ± 25 s for knee extensors, and 72 ± 14 s for elbow flexors). MVC force loss immediately after voluntary task failure was similar (-30 ± 11% for plantar flexors, -37 ± 13% for thumb adductor, -34 ± 15% for knee extensors, and -40 ± 12% for elbow flexors, P > 0.05). Voluntary activation was decreased for plantar flexors only (from 95 ± 5% to 82 ± 9%, P < 0.05). Potentiated evoked doublet amplitude was more depressed for upper limb muscles (-59.3 ± 14.7% for elbow flexors and -60.1 ± 24.1% for thumb adductor, P < 0.05) than for knee extensors (-28 ± 15%, P < 0.05); no reduction was found in plantar flexors (-7 ± 12%, P > 0.05). In conclusion, despite different times to task failure when sustaining an isometric contraction at 50% MVC force for as long as possible, diverse muscle groups present similar loss of MVC force after task failure. Thus the extent of muscle fatigue is not affected by time to task failure, whereas this latter determines the etiology of fatigue.

Authors+Show Affiliations

Institute of Movement Sciences and Sports Medicine, University of Geneva, Geneva, Switzerland.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

23471948

Citation

Neyroud, Daria, et al. "Comparison of Neuromuscular Adjustments Associated With Sustained Isometric Contractions of Four Different Muscle Groups." Journal of Applied Physiology (Bethesda, Md. : 1985), vol. 114, no. 10, 2013, pp. 1426-34.
Neyroud D, Rüttimann J, Mannion AF, et al. Comparison of neuromuscular adjustments associated with sustained isometric contractions of four different muscle groups. J Appl Physiol (1985). 2013;114(10):1426-34.
Neyroud, D., Rüttimann, J., Mannion, A. F., Millet, G. Y., Maffiuletti, N. A., Kayser, B., & Place, N. (2013). Comparison of neuromuscular adjustments associated with sustained isometric contractions of four different muscle groups. Journal of Applied Physiology (Bethesda, Md. : 1985), 114(10), 1426-34. https://doi.org/10.1152/japplphysiol.01539.2012
Neyroud D, et al. Comparison of Neuromuscular Adjustments Associated With Sustained Isometric Contractions of Four Different Muscle Groups. J Appl Physiol (1985). 2013 May 15;114(10):1426-34. PubMed PMID: 23471948.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Comparison of neuromuscular adjustments associated with sustained isometric contractions of four different muscle groups. AU - Neyroud,Daria, AU - Rüttimann,Jennifer, AU - Mannion,Anne F, AU - Millet,Guillaume Y, AU - Maffiuletti,Nicola A, AU - Kayser,Bengt, AU - Place,Nicolas, Y1 - 2013/03/07/ PY - 2013/3/9/entrez PY - 2013/3/9/pubmed PY - 2014/4/15/medline KW - contractile properties KW - endurance time KW - fatigue KW - maximal voluntary contraction KW - surface electromyography SP - 1426 EP - 34 JF - Journal of applied physiology (Bethesda, Md. : 1985) JO - J Appl Physiol (1985) VL - 114 IS - 10 N2 - The extent and characteristics of muscle fatigue of different muscle groups when subjected to a similar fatiguing task may differ. Thirteen healthy young men performed sustained contractions at 50% maximal voluntary contraction (MVC) force until task failure, with four different muscle groups, over two sessions. Per session, one upper limb and one lower limb muscle group were tested (knee extensors and thumb adductor, or plantar and elbow flexors). Changes in voluntary activation level and contractile properties were derived from doublet responses evoked during and after MVCs before and after exercise. Time to task failure differed (P < 0.05) between muscle groups (220 ± 64 s for plantar flexors, 114 ± 27 s for thumb adductor, 77 ± 25 s for knee extensors, and 72 ± 14 s for elbow flexors). MVC force loss immediately after voluntary task failure was similar (-30 ± 11% for plantar flexors, -37 ± 13% for thumb adductor, -34 ± 15% for knee extensors, and -40 ± 12% for elbow flexors, P > 0.05). Voluntary activation was decreased for plantar flexors only (from 95 ± 5% to 82 ± 9%, P < 0.05). Potentiated evoked doublet amplitude was more depressed for upper limb muscles (-59.3 ± 14.7% for elbow flexors and -60.1 ± 24.1% for thumb adductor, P < 0.05) than for knee extensors (-28 ± 15%, P < 0.05); no reduction was found in plantar flexors (-7 ± 12%, P > 0.05). In conclusion, despite different times to task failure when sustaining an isometric contraction at 50% MVC force for as long as possible, diverse muscle groups present similar loss of MVC force after task failure. Thus the extent of muscle fatigue is not affected by time to task failure, whereas this latter determines the etiology of fatigue. SN - 1522-1601 UR - https://www.unboundmedicine.com/medline/citation/23471948/Comparison_of_neuromuscular_adjustments_associated_with_sustained_isometric_contractions_of_four_different_muscle_groups_ L2 - https://journals.physiology.org/doi/10.1152/japplphysiol.01539.2012?url_ver=Z39.88-2003&amp;rfr_id=ori:rid:crossref.org&amp;rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -