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Post by imperfectgolfer on Apr 20, 2020 10:25:17 GMT -5
Dr Mann Is this correct below that the isometric contraction of the hamstrings can keep the leg flexed and are also responsible for the raising and lowering of the thigh from a flexed position? DG I think that both isometric and eccentric loading of the right knee joint flexor/extensor muscles are likely happening at the same time. So, if the right knee straightens slightly, it is probably due to concentric contraction of the right knee quadriceps muscles combined with eccentric contraction of the right hamstring muscles. I suspect that all those muscles are also isometrically active during the late backswing and early downswing. Contraction of the iliopsoas muscles increases hip joint flexion and it can potentially help "stabilise" the right leg/foot by increasing pressure-loading of the right leg/foot during the hip-squaring phase. The right gluteus maximus muscle is probably eccentrically contracting at the same time. It is impossible for me to really know to what degree any pelvic girdle muscle is isometrically contracting versus eccentrically contracting because EMG studies cannot answer that question. Jeff.
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Post by dubiousgolfer on Apr 20, 2020 21:40:41 GMT -5
Dr Mann Is this correct below that the isometric contraction of the hamstrings can keep the leg flexed and are also responsible for the raising and lowering of the thigh from a flexed position? DG I think that both isometric and eccentric loading of the right knee joint flexor/extensor muscles are likely happening at the same time. So, if the right knee straightens slightly, it is probably due to concentric contraction of the right knee quadriceps muscles combined with eccentric contraction of the right hamstring muscles. I suspect that all those muscles are also isometrically active during the late backswing and early downswing. Contraction of the iliopsoas muscles increases hip joint flexion and it can potentially help "stabilise" the right leg/foot by increasing pressure-loading of the right leg/foot during the hip-squaring phase. The right gluteus maximus muscle is probably eccentrically contracting at the same time. It is impossible for me to really know to what degree any pelvic girdle muscle is isometrically contracting versus eccentrically contracting because EMG studies cannot answer that question. Jeff. Many thanks Dr Mann DG
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