Kurokawa Nozomi, Fujiwara Katsuo, Kiyota Naoe
Department of Physical Therapy, Gumma Paz College, 1-7-1 Tonya-machi, Takasaki 370-0006, Japan.
Department of Human Movement and Health, Graduate School of Medical Science, Kanazawa University, 13-1 Takara-machi, Kanazawa 920-8640, Japan.
Perception. 2013;42(7):778-89. doi: 10.1068/p7470.
The aim of this study was to determine the postural response accompanying Achilles tendon vibration stimulation during various phases of the sit-to-stand movement. Twelve healthy young adults performed the sit-to-stand movement in response to an auditory signal 2 s after a first one. Vibration stimulation with a 100 Hz frequency was applied to both Achilles tendons during the following phases: (1) 10 s of sitting before standing up; (2) 10 s plus a period until the standing position was achieved; and (3) 5 s after standing. The postural response after standing was analyzed with the center of foot pressure in the anteroposterior direction. Forward-leaning responses were identified in 78.3% and 63.3% of trials under conditions 1 and 2, respectively. Backward-leaning responses were identified in 93.3% of the trials under condition 3. Response latency (+/- standard deviation) was significantly longer under conditions 1 and 2 than under condition 3 (1: 872 +/- 576, 2: 1026 +/- 542, and 3:555 +/- 322 ms; ps < 0.05). Sensory information at the standing point might be anticipated based on sensory information received while sitting. Consequently, postural response as a compensatory movement would occur via the sensory reference system within the supraspinal nervous system.
本研究的目的是确定在从坐到站运动的各个阶段中，跟腱振动刺激所伴随的姿势反应。12名健康的年轻成年人在听到第一个听觉信号2秒后，根据该信号进行从坐到站的运动。在以下阶段对双侧跟腱施加100Hz频率的振动刺激：(1) 站立前10秒的坐姿；(2) 10秒加上直至达到站立姿势的一段时间；(3) 站立后5秒。通过前后方向的足底压力中心分析站立后的姿势反应。在条件1和条件2下，分别有78.3%和63.3%的试验中出现前倾反应。在条件3下，93.3%的试验中出现后倾反应。条件1和条件2下的反应潜伏期（±标准差）显著长于条件3（条件1：872±576，条件2：1026±542，条件3：555±322毫秒；p<0.05）。站立时的感觉信息可能基于坐着时接收到的感觉信息进行预测。因此，作为一种补偿性运动的姿势反应将通过脊髓上神经系统内的感觉参照系统发生。
