抄録
Eight male subjects performed maximal-effort 1: ankle plantarflexion jumping (AJ) from the standing position, 2: squat jumping (SQJ) from the squat position, 3: counter movement jumping (CMJ) from the standing position, and 4: straight legged drop jumping (DJ) from a height of 0.20 m. Biomechanical data were obtained using a high-speed camera and a force platform system. Also, fascicles and tendinous structures of gastrocnemius were observed using ultrasonography. During the push-off phase, 2.1J (47% of total muscle-tendon complex work), 4.4J (86%), 3.8J (79%) and 5.8J (75%) of the stored energy in gastrocnemius was reutilized in AJ, SQJ, CMJ and DJ, respectively.
