Comenius University in Bratislava.
Slovak University of Technology.
Motor Control. 2021 Apr 21;25(3):437-450. doi: 10.1123/mc.2020-0097.
This study investigates postural responses to unexpected perturbations induced by a load release of different weights. Groups of 26 men (age 22.6 ± 2.4 years, height 178.0 ± 9.1 cm, and body mass 86.9 ± 11.5 kg) and 21 women (age 21.9 ± 2.7 years, height 168.8 ± 6.8 cm, and body mass 65.3 ± 8.7 kg) underwent load-triggered postural perturbations by 1 and 2 kg while standing on a force plate with either eyes open or eyes closed. Postural perturbations induced by a heavier load, representing about 2% and 3% of body weight in men and women, respectively, led to significantly higher peak anterior and peak posterior center of pressure displacements when compared with a lighter load (29.6% and 45.4%, respectively) both with eyes open (36.9%) and closed (42.1%). Their values were significantly lower in men than women only when a higher load was used (∼25%). However, there were no significant differences in time to peak anterior and posterior center of pressure displacements. These findings indicate that heavier load-induced postural perturbations are greater in women than men regardless of visual conditions. This underlines the importance of loading dose in the magnitude of postural responses to externally induced perturbations.
本研究旨在探究在不同重量的负载释放情况下，人体对意外扰动的姿势反应。26 名男性（年龄 22.6 ± 2.4 岁，身高 178.0 ± 9.1cm，体重 86.9 ± 11.5kg）和 21 名女性（年龄 21.9 ± 2.7 岁，身高 168.8 ± 6.8cm，体重 65.3 ± 8.7kg）在睁眼或闭眼状态下站在力板上，通过 1kg 和 2kg 的负载来触发姿势扰动。与较轻的负载（分别为 29.6%和 45.4%）相比，较重负载（分别代表男性和女性体重的 2%和 3%）引起的姿势扰动导致前向和后向峰值中心压力位移明显更高（分别为 36.9%和 42.1%），无论睁眼还是闭眼状态下均如此。只有当使用更高的负载时，男性的这些值才明显低于女性（约 25%）。然而，前向和后向峰值中心压力位移的达到峰值时间并无显著差异。这些发现表明，无论视觉条件如何，女性对较重负载引起的姿势扰动的反应均大于男性。这强调了加载剂量对外部诱导的姿势反应幅度的重要性。
