英文摘要
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This study investigated the effects of the plantar flexion angle of the front foot on the joint angle of the lower extremity, the range of motion, the stroke distance, the stroke force, as well as the muscle activities of the tibialis anterior, gastrocnemius, quadriceps, and biceps femoris. Five Canadian canoe athletes were recruited from Taipei Physical Education College as the participants for this study. All subjects conducted a 15-second stroke with the maximum effort under the angle of the front foot at 0° 5°, 10°, 15°, and 20°, respectively. Ten cameras with the 100 Hz of motion analysis system, a load cell, and the surface EMG electrodes were used to collect the kinematics, kinetics and muscle activity parameters. The results revealed that the knee and ankle joints had a bigger range of motion at 20°. The stroke distance only slightly changed with the increasing plantar flexion angle. The peak stroke force lowered to 10°. The mEMG of quadriceps increased and muscle activities of other muscle groups decreased, when the front foot of the plantar flexion angle was bigger. The finding of this study suggested that the canoe athletes could get a good stroke performance through changing the range of motion and the pattern of muscle contraction of the lower extremity, which resulted from the front foot of the change of the plantar flexion angle.
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