Age and gender moderate the effects of localized muscle fatigue on lower extremity joint torques used during quiet stance.
Wojcik-LA; Nussbaum-MA; Lin-D; Shibata-PA; Madigan-ML
Hum Mov Sci 2011 Jun; 30(3):574-583
This study examined the effects of localized muscle fatigue, age, and gender on lower extremity joint torques used during quiet stance. Thirty-two participants performed exercises designed to fatigue the ankle plantarflexors, knee extensors, torso extensors, or shoulder flexors. Body kinematics and ground reaction forces were obtained both before and after the exercises, and joint torques were derived via inverse dynamics. Single joint fatigue affected torque variability at all lower extremity joints, with similar changes for both age groups. Males and females exhibited increased ankle torque variability after different tasks, with males showing more variability after ankle fatigue and females after shoulder and lumbar fatigue. Correlations between peak torques and torque variability differed between males and females and between age groups in certain cases. The results of this study suggested that both age and gender moderate the effects of fatigue on postural control and should be considered when developing strategies to prevent occupational falls.
Biomechanics; Human-factors-engineering; Age-factors; Muscle-function; Men; Women; Fatigue; Extremities; Physiological-fatigue; Physiological-response; Physiology; Posture; Body-mechanics; Physical-exercise; Biodynamics;
Author Keywords: Equilibrium; Working conditions; Fatigue; Aging; Physical strength
L.A. Wojcik & Associates, LLC, 2531 Jackson Avenue, Suite #349, Ann Arbor, MI 48103, USA
Human Movement Science
Virginia Polytechnic Institute and State University