Hanawa Hiroki, Miyazawa Taku, Hirata Keisuke, Kubota Keisuke, Fujino Tsutomu
Department of Rehabilitation, Faculty of Health Science, University of Human Arts and Sciences, 354-3 Shinshoji-Guruwa, Ota-aza, Iwatsuki-ku, Saitama-shi 339-8555, Saitama, Japan.
Department of Rehabilitation, Faculty of Health Sciences, Tokyo Kasei University, 2-15-1 Inariyama, Sayama-shi 350-1398, Saitama, Japan.
J Funct Morphol Kinesiol. 2025 May 1;10(2):156. doi: 10.3390/jfmk10020156.
The role of tibialis anterior activity in sit-to-stand motion is unclear. We hypothesized that contraction of the tibialis anterior would slightly lift the forefoot and shift the center of pressure backward. The objective of this study was to clarify this movement and its role in tibialis anterior activity. Ten healthy adults performed the sit-to-stand motion. Cross-correlation coefficients among tibialis anterior activity, shank inclination angle, and center of pressure were calculated. Whole-body joint moments were simulated when the center of pressure varied within the foot. The angle of the ground reaction force during seat-off was calculated. The center of pressure moved backward in all trials for all participants. The mean lag time for peak cross-correlation coefficients between the tibialis anterior and shank tilt and between the tibialis anterior and center of pressure was 0.37 and 0.13 s, respectively. Simulating the center of pressure forward resulted in greater whole-body joint moments than those measured (mean 1.88 times). The ground reaction forces were nearly perpendicular to the floor. From the perspective of temporal synchrony, tibialis anterior activity significantly contributed to the backward shift of the center of pressure. The center of pressure shift minimized the force exerted by the entire body.
胫骨前肌活动在从坐到站动作中的作用尚不清楚。我们假设胫骨前肌的收缩会轻微抬起前足并使压力中心向后移动。本研究的目的是阐明这种运动及其在胫骨前肌活动中的作用。10名健康成年人进行了从坐到站的动作。计算了胫骨前肌活动、小腿倾斜角度和压力中心之间的互相关系数。当压力中心在足部范围内变化时，模拟了全身关节力矩。计算了离座时地面反作用力的角度。在所有参与者的所有试验中，压力中心均向后移动。胫骨前肌与小腿倾斜之间以及胫骨前肌与压力中心之间峰值互相关系数的平均滞后时间分别为0.37秒和0.13秒。将压力中心向前模拟产生的全身关节力矩比测量值更大（平均为1.88倍）。地面反作用力几乎垂直于地面。从时间同步的角度来看，胫骨前肌活动对压力中心的向后移动有显著贡献。压力中心的移动使全身施加的力最小化。
