Lower extremity muscle functions during full squats

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Bibliographic Details
Title translated into German:Die Muskelfunktionen der unteren Extremität bei tiefen Kniebeugen
Author:Robertson, D.G.E.; Wilson, Jean-Marie J.; St. Pierre,Taunya A.
Published in:Journal of applied biomechanics
Published:24 (2008), 4, S. 333-339, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
Language:English
ISSN:1065-8483, 1543-2688
Keywords:
Online Access:
Identification number:PU201001000207
Source:BISp

Abstract

The purpose of this research was to determine the functions of the gluteus maximus, biceps femoris, semitendinosus, rectus femoris, vastus lateralis, soleus, gastrocnemius, and tibialis anterior muscles about their associated joints during full (deep-knee) squats. Muscle function was determined from joint kinematics, inverse dynamics, electromyography, and muscle length changes. The subjects were six experienced, male weight lifters. Analyses revealed that the prime movers during ascent were the monoarticular gluteus maximus and vasti muscles (as exemplified by vastus lateralis) and to a lesser extent the soleus muscles. The biarticular muscles functioned mainly as stabilizers of the ankle, knee, and hip joints by working eccentrically to control descent or transferring energy among the segments during scent. During the ascent phase, the hip extensor moments of force produced the largest powers followed by the ankle plantar flexors and then the knee extensors. The hip and knee extensors provided the initial bursts of power during ascent with the ankle extensors and especially a second burst from the hip extensors adding power during the latter half of the ascent. Verf.-Referat