Mechanical energy output and joint movements in sprint running

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Abstract
The purpose of the present study was to establish the relation between joint movement and the mechanical power output in spring running. Four sprinters ran several times from starting-blocks at various distances from a strain-gauge platform-. Mechanical power in the forward direction (P¯f) increased with the time from start, reaching maximum values of 2000-2500 W. Power against gravity (P¯v) was about 300-500 W and independent of running velocity. Total mechanical power (P¯tot) which was obtained from Pf( plus P¯v increased with velocity up to about 3000 W. Mechanical power (P¯f or P¯tot) developed during the push related linearly to the changes of the angle of the knee and of the ankle joint flexed during the negative phases (Δθk and Δθa. It may be concluded from these results that a portion of the power exerted in the positive phase was due to the energy stored in muscles being lengthened during the negative phase.

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