Intensity-level assessment of lower body plyometric exercises based on mechanical output of lower limb joints |
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| Authors: | Norihide Sugisaki Junichi Okada Hiroaki Kanehisa |
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| Institution: | 1. Faculty of Sport Sciences , Waseda University , 2-579-15 Mikajima, Tokorozawa , Saitama , 359-1192 , Japan sugisaki@aoni.waseda.jp;3. Faculty of Sport Sciences , Waseda University , 2-579-15 Mikajima, Tokorozawa , Saitama , 359-1192 , Japan;4. National Institute of Fitness and Sports in Kanoya , 1 Shiromizu, Kanoya , Kagoshima , 891-2311 , Japan |
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| Abstract: | Abstract The present study aimed to quantify the intensity of lower extremity plyometric exercises by determining joint mechanical output. Ten men (age, 27.3 ± 4.1 years; height, 173.6 ± 5.4 cm; weight, 69.4 ± 6.0 kg; 1-repetition maximum 1RM] load in back squat 118.5 ± 12.0 kg) performed the following seven plyometric exercises: two-foot ankle hop, repeated squat jump, double-leg hop, depth jumps from 30 and 60 cm, and single-leg and double-leg tuck jumps. Mechanical output variables (torque, angular impulse, power, and work) at the lower limb joints were determined using inverse-dynamics analysis. For all measured variables, ANOVA revealed significant main effects of exercise type for all joints (P < 0.05) along with significant interactions between joint and exercise (P < 0.01), indicating that the influence of exercise type on mechanical output varied among joints. Paired comparisons revealed that there were marked differences in mechanical output at the ankle and hip joints; most of the variables at the ankle joint were greatest for two-foot ankle hop and tuck jumps, while most hip joint variables were greatest for repeated squat jump or double-leg hop. The present results indicate the necessity for determining mechanical output for each joint when evaluating the intensity of plyometric exercises. |
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| Keywords: | kinetics jump hip knee ankle |
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