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根据支撑时支撑腿的各个关节肌肉收缩特点对支撑腿的腿长变化影响，运用人体在支撑时的转动特点和人体获得的支撑反作用力的特点，分析人体在支撑时的重心轨迹变化。得出：支撑时人体重心最低点是在支撑时的开始，而不是在膝关节角度为最小的支撑时相。
According to the influence of the contractile characteristics of each joint’s supporting muscles on the leg length of support legs, the change of the center of gravity trajectory of the human body when the human body is supported is analyzed by using the rotating characteristics of the human body during the support and the counterforce of the support obtained by the human body. Draw: the lowest point of bodily center of gravity is the beginning of support, not the support phase with the smallest knee angle.