Development of the SSC prescription programs for the elderly person who wants to continue walking well

科学研究費助成事業(科学研究費補助金)研究成果報告書：基盤研究(C)2009-2011課題番号：2150060

クリーンエクササイズにおける挙上重量と下肢3関節の力発揮特性の関係

The purpose of this study was to identify the ground reaction force and lower extremity joint kinetics during clean exercises performed with light and heavy loads. Thirteen male track and field athletes performed the clean exercises from 20 kg to one repetition maximum (1RM). Kinetic data were collected from recorded data using a Vicon motion system (250 Hz) and force platforms (1,000 Hz). The results of the analyses were as follows: (1) Ground reaction force and joint kinetics of hip and ankle were increased by increasing loads in clean exercises. (2) From light to heavy loads, we found relationships between ground reaction force and joint torque of hip in clean exercises. (3) In progressing from light to heavy loads, some subjects continued to involve the muscle group controlling the hip joint as the main power source, while others did not. The results indicate that clean exercises yield different individual characteristics for training. These results suggest that the clean exercise is effective for selectively the hip extensor in all loads

下肢 Stiffness 特性がバウンディングの踏切動作に及ぼす影響

 In the present study, we aimed to (1) clarify the relationship between stiffness and take-off leg motion during bounding and (2) append the information gathered from the study to a hierarchical training model (Kariyama and Zushi 2013, 2015). Seventeen male track and field athletes (sprinters, jumpers, and decathletes) performed bounding. Jumping motions in the sagittal plane (300 Hz) and ground reaction force data (1,000 Hz) were recorded. Stiffness was calculated using the spring-mass model, and the kinematic and kinetic variables of both the take-off leg and swing leg were calculated. We found correlations between stiffness and the following parameters: vertical ground reaction force impulse during the late phase (r=−0.488), distance between the center of gravity of the body (CG) and the toe at touch down (r=−0.760), hip-toe distance at touch down and at toe off (r=−0.568 and −0.472, respectively), range of flexion at the hip joint angle (r=−0.517), range of extension at the knee joint angle (r=−0.484), negative joint work and relative work at the hip joint (r=−0.462 and −0.511, respectively), positive joint work and relative work at the knee joint (r=−0.619 and −0.534, respectively), swing-leg angle at touch down (r=−0.755), and swing-leg vertical impulse during the late phase (r=−0.535). The results we obtained suggest that take-off motion in bounding is affected by stiffness characteristics, although jump distance is not affected by stiffness (Kariyama and Zushi 2013, 2015). Previous studies (Kariyama and Zushi 2013, 2015) indicated that stiffness in bounding is affected by stiffness in rebound jumping. On the basis of our results and those of previous studies, take-off motion correlated with stiffness in bounding could be affected by rebound jump stiffness. Therefore, an understanding of the characteristics of stiffness in rebound jumping is important for training that changes the above-mentioned take-off motion in bounding

次世代型筋力・パワートレーニングアセスメントの開発

科学研究費助成事業 研究成果報告書：基盤研究(B)2013-2015課題番号 : 2528219