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The illustration of I.T.T. at each force level. The Ti is the twitch force evoked during a voluntary contracted muscle. The Tc is the twitch force that evoked in a resting muscle. Different traces represented the I.T.T. applied on different voluntary force level. While the voluntary forces increased, the superimposed twitch force (Ti) decreased (arrows). The steep decline of force after Ti was due to the muscle relaxation which was not analyzed in this study.
