Evoked tetanic torque and activation level explain strength differences by side

被引:47
作者
Krishnan, Chandramouli [2 ]
Williams, Glenn N. [1 ,2 ,3 ]
机构
[1] Univ Iowa, Carver Coll Med, Musculoskeletal Biomech & Sports Med Res Lab, Iowa City, IA 52242 USA
[2] Univ Iowa, Grad Program Phys Therapy & Rehabil Sci, Iowa City, IA 52242 USA
[3] Univ Iowa, Ctr Sports Med, Iowa City, IA 52242 USA
关键词
Central activation; Antagonist muscle activity; Knee strength; Contractile properties; ITT; VOLUNTARY MUSCLE ACTIVATION; CRUCIATE LIGAMENT INJURY; CROSS-SECTIONAL AREA; CONTRACTILE PROPERTIES; QUADRICEPS WEAKNESS; FORCE; YOUNG; REHABILITATION; ANTERIOR; RECONSTRUCTION;
D O I
10.1007/s00421-009-1057-y
中图分类号
Q4 [生理学];
学科分类号
071003 [生理学];
摘要
Previous studies have demonstrated that healthy young people typically have side-to-side differences in knee strength of about 10% when the peak torque generated by the stronger leg is contrasted with that of the weaker leg. However, the mechanisms responsible for side-to-side differences in knee strength have not been clearly defined. The current study tested the hypothesis that side-to-side knee extensor strength differences are explained by inter-limb variations in voluntary activation, antagonistic hamstrings activity, and electrically evoked torque at rest. Twenty-two volunteers served as subjects. Side-to-side differences in quadriceps activation and electrically evoked knee extensor torque explained 69% of the strength differences by side. Antagonistic hamstrings activity did not contribute significantly. The results suggest both central and peripheral mechanisms contribute to inter-limb variations in strength.
引用
收藏
页码:769 / 774
页数:6
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