The fiber type composition of human limb muscles is believed to influence explosive movement ability. Indirect evidence is found in data from power athletes, who tend to have a greater percentage of fast twitch (FT) muscle fibers, and a lower percentage of slow twitch (ST) fibers, than endurance athletes [e.g., 1]. The apparent advantage of having a high proportion of FT fibers in explosive activities is reinforced by the existence of significant positive correlations between the percentage of FT fibers and jump height [e.g., 2].

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