@article{oai:kanazawa-u.repo.nii.ac.jp:00000809,
 author = {山田, 孝禎 and 出村, 慎一 and 北林, 保},
 issue = {2},
 journal = {日本生理人類学会誌 = Japanese journal of physiological anthropology},
 month = {May},
 note = {This study examined the influence of chair seat heights on floor reaction force (FRF) and strength of lower-limbs during sit-to-stand (STS) movement. Fifteen young・adult male subjects participated in this study (age: 20.7±2 .6 yr, height: 172.8±4.8 cm, body-mass: 66.3±5.2 kg, lower-thigh-length: 40.2±1.7 cm). The subjects performed STS movement twice from a chair height adjusted to 80, 100 and 120% of their lower-thigh-length (LTL). Vertical FRF and electromyogram (EMG) on the rectus femoris and tibialis anterior muscles during STS movement were measured to evaluate the force of knocking over and the burden on the legs. Fifteen parameters (FRF: 10, EMG: 5) were selected for analysis. The FRF at the time of hip-syneresis, the impulse between movement onset and hip-syneresis, and the active mass of the rectus femoris and tibialis anterior muscles from the beginning of movement to finishing were significantly greater in the 80% LTL condition than in the 120% LTL condition. The results of this study suggest that the force of knocking over at the instant of hip-syneresis and the active mass of lower legs muscles during STS movement were greater in the 80% LTL condition as compared with the 120% LTL condition. It is, therefore, inferred that the legs have a greater burden during STS movement in the 80% LTL condition and subjects have more difficulty in achieving STS movement. Moreover, judging from the time-series change of EMG on the rectus femoris and tibialis anterior muscles, their roles in achieving STS movement are different .Namely, the former may contribute mainly to transferring the center of mass upward and the latter may mainly maintain body balance.},
 pages = {47--52},
 title = {立ち上がり動作時における床反力および下肢筋力に及ぼす椅子高の影響},
 volume = {9},
 year = {2004}
}