PMID: 8964781Apr 1, 1996Paper

Mechanical output from individual muscles during explosive leg extensions: the role of biarticular muscles

Journal of Biomechanics
R JacobsG J van Ingen Schenau

Abstract

The main result of this study is that biarticular leg muscles contribute significantly to the work done at joints, due to transfer of power during explosive leg extensions. In particular, a net power transfer was shown from hip to knee joint during jumping and sprinting. Seven elite athletes performed explosive one legged jump and spring push offs. Kinematics, ground reaction forces and electromyography (EMG) of leg muscles were recorded. The mechanical output of six individual muscle groups was estimated by using Hill-based muscle models. The EMG and kinematics served as input to these models. For jumping as well as for sprinting, the model estimated similar results for the relative work contribution done about a joint due to transfer of power by the biarticular muscles. Rectus femoris showed a power transfer from hip to knee joint, while in contrast hamstrings showed a power transfer from knee to hip joint. Regardless of these opposite directions of power transfer, a net transfer occurred from the hip to the knee joint. The relative work contribution of hamstrings done in hip extension was 7% in jumping and 11% in sprinting. For rectus femoris, the relative work contribution done in knee extension was 21% in jumping and 31% i...Continue Reading

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Citations

Dec 23, 2006·European Journal of Applied Physiology·Hans E BergIgor B Mekjavic
Mar 5, 2004·Journal of Biomechanics·M A Mark A King, M R Maurice R Yeadon
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