(Division of Physical Education,Shandong Architecture College , Jinan 250014,China) Abstract:In dash running, the hind-hip joint does not bend, but continually stretch, ankle joint and knee joint does not bend actively but passively when leg lands. Thrusting against the ground actively can shorten the braking time and help decrease braking impulse, it is necessary for understanding the running principle to divide carefully the cushioning action of landing, the cushioning action of landing include fore-thrusting and hind-thrusting, we should devote much attention to the leg thrust, it is important to define the leg thrust explicitly. Key words: dash; landing cushion; braking impulse |
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