Journal ArticleDOI
The effect of the squat exercise on knee stability.
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Over an 8-wk training program, full or half squats did not consistently affect knee stability compared to non-squatting controls and powerlifters and weightlifters were significantly tighter than controls on the quadriceps active drawer at 90 degrees of knee flexion.Abstract:
Past studies have produced conflicting results as to the effect of squat exercises on knee stability. One hundred male and female college students were measured using a knee ligament arthrometer on nine tests of knee stability. Over an 8-wk training program, full or half squats did not consistently affect knee stability compared to non-squatting controls. To measure the effect of long-term squat training 27 male powerlifters (14 Elite or Master Class) and 28 male weightlifters (8 Elite or Master Class) were measured on the same tests. Powerlifters were significantly tighter than controls on the anterior drawer at 90 degrees of knee flexion. Both powerlifters and weightlifters were significantly tighter than controls on the quadriceps active drawer at 90 degrees of knee flexion. Data on powerlifters and weightlifters were also analyzed by years of experience and skill level. No effect of squat training on knee stability was demonstrated in any of the groups tested.read more
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Journal ArticleDOI
Knee biomechanics of the dynamic squat exercise.
TL;DR: The squat was shown to be an effective exercise to employ during cruciate ligament or patellofemoral rehabilitation, and can enhance stability if performed correctly.
Journal ArticleDOI
Effect of knee position on hip and knee torques during the barbell squat.
TL;DR: Although restricting forward movement of the knees may minimize stress on the knees, it is likely that forces are inappropriately transferred to the hips and low-back region and appropriate joint loading during this exercise may require the knees to move slightly past the toes.
Journal ArticleDOI
Greater movement-related cortical potential during human eccentric versus concentric muscle contractions.
Yin Fang,Yin Fang,Vlodek Siemionow,Vlodek Siemionow,Vinod Sahgal,Fuqin Xiong,Guang H. Yue,Guang H. Yue,Guang H. Yue +8 more
TL;DR: Although the elbow flexor muscle activation (EMG) was lower during eccentric than concentric actions, the amplitude of two major MRCP components-one related to movement planning and execution and the other associated with feedback signals from the peripheral systems-was significantly greater for eccentric than for concentric action.
Journal ArticleDOI
Estimation of Relative Load From Bar Velocity in the Full Back Squat Exercise.
Luis Sánchez-Medina,Jesús G. Pallarés,Carlos E. Pérez,Ricardo Morán-Navarro,Juan José González-Badillo +4 more
TL;DR: Provided that repetitions are performed at maximal intended velocity, a good estimation of load can be obtained from mean velocity as soon as the first repetition is completed and allows implementing a velocity-based resistance training approach.
Journal ArticleDOI
Health- and performance-related potential of resistance training.
Michael H. Stone,Michael H. Stone,Steven J. Fleck,Steven J. Fleck,N. Travis Triplett,N. Travis Triplett,William J. Kraemer,William J. Kraemer +7 more
TL;DR: Weight-training has generally been believed to have limited value in modifying risks of cardiovascular disease, but cross-sectional and longitudinal studies of bodybuilders suggest that weight-training may beneficially alter glucose tolerance and insulin sensitivity.