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Mechanisms of fatigue differ after low- and high-force fatiguing contractions in men and women.
Muscle Nerve. 2007 Oct; 36(4):515-24.MN

Abstract

The magnitude of failure in voluntary drive after fatiguing contractions of different intensities in men and women is not known. The purpose of this study was to compare the time to task failure and voluntary activation of men and women for a sustained isometric contraction performed at a low and high intensity with the elbow flexor muscles. Nine men and nine women sustained an isometric contraction at 20% and 80% of maximal voluntary contraction (MVC) force until task failure during separate sessions. The men had a shorter time to failure than women for the 20% but not the 80% MVC task. Voluntary activation was reduced to similar levels for the men and women at the end of the fatiguing contractions but was reduced less after the 80% MVC task than the 20% MVC contraction. Twitch amplitude was reduced similarly at task failure for both sexes and to similar levels at termination of the 20% and 80% MVC tasks. The rate of change in mean arterial pressure was the main predictor of time to failure for the low-force sustained contraction. These results suggest that women experienced greater muscle perfusion, less peripheral fatigue, and a longer time to task failure than men during the low-force fatiguing contraction. However, the low-force task induced greater central fatigue than the high-force contraction for both men and women. Thus, low-force, long-duration fatiguing contractions can be used in rehabilitation to induce significant fatigue within the central nervous system and potentially greater neural adaptations in men and women.

Authors+Show Affiliations

Exercise Science Program, Department of Physical Therapy, Marquette University, Milwaukee, WI 53201, USA.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17626289

Citation

Yoon, Tejin, et al. "Mechanisms of Fatigue Differ After Low- and High-force Fatiguing Contractions in Men and Women." Muscle & Nerve, vol. 36, no. 4, 2007, pp. 515-24.
Yoon T, Schlinder Delap B, Griffith EE, et al. Mechanisms of fatigue differ after low- and high-force fatiguing contractions in men and women. Muscle Nerve. 2007;36(4):515-24.
Yoon, T., Schlinder Delap, B., Griffith, E. E., & Hunter, S. K. (2007). Mechanisms of fatigue differ after low- and high-force fatiguing contractions in men and women. Muscle & Nerve, 36(4), 515-24.
Yoon T, et al. Mechanisms of Fatigue Differ After Low- and High-force Fatiguing Contractions in Men and Women. Muscle Nerve. 2007;36(4):515-24. PubMed PMID: 17626289.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Mechanisms of fatigue differ after low- and high-force fatiguing contractions in men and women. AU - Yoon,Tejin, AU - Schlinder Delap,Bonnie, AU - Griffith,Erin E, AU - Hunter,Sandra K, PY - 2007/7/13/pubmed PY - 2007/12/6/medline PY - 2007/7/13/entrez SP - 515 EP - 24 JF - Muscle & nerve JO - Muscle Nerve VL - 36 IS - 4 N2 - The magnitude of failure in voluntary drive after fatiguing contractions of different intensities in men and women is not known. The purpose of this study was to compare the time to task failure and voluntary activation of men and women for a sustained isometric contraction performed at a low and high intensity with the elbow flexor muscles. Nine men and nine women sustained an isometric contraction at 20% and 80% of maximal voluntary contraction (MVC) force until task failure during separate sessions. The men had a shorter time to failure than women for the 20% but not the 80% MVC task. Voluntary activation was reduced to similar levels for the men and women at the end of the fatiguing contractions but was reduced less after the 80% MVC task than the 20% MVC contraction. Twitch amplitude was reduced similarly at task failure for both sexes and to similar levels at termination of the 20% and 80% MVC tasks. The rate of change in mean arterial pressure was the main predictor of time to failure for the low-force sustained contraction. These results suggest that women experienced greater muscle perfusion, less peripheral fatigue, and a longer time to task failure than men during the low-force fatiguing contraction. However, the low-force task induced greater central fatigue than the high-force contraction for both men and women. Thus, low-force, long-duration fatiguing contractions can be used in rehabilitation to induce significant fatigue within the central nervous system and potentially greater neural adaptations in men and women. SN - 0148-639X UR - https://www.unboundmedicine.com/medline/citation/17626289/Mechanisms_of_fatigue_differ_after_low__and_high_force_fatiguing_contractions_in_men_and_women_ L2 - https://doi.org/10.1002/mus.20844 DB - PRIME DP - Unbound Medicine ER -