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.

这项研究调查了对由不同重量的负载释放引起的意外扰动的姿势反应。26 名男性（年龄 22.6 ± 2.4 岁，身高 178.0 ± 9.1 厘米，体重 86.9 ± 11.5 公斤）和 21 名女性（年龄 21.9 ± 2.7 岁，身高 168.8 ± 6.8 厘米，体重 65.3 ± 65.3 公斤）接受了 ± 8.7 公斤的试验。在睁眼或闭眼的情况下站在测力板上时，负载触发的姿势扰动分别为 1 和 2 公斤。与较轻的负荷（29.6% 和 45.4%）相比，较重负荷引起的姿势扰动（分别约占男性和女性体重的 2% 和 3%）导致压力位移的峰值前部和后部峰值显着更高，分别）睁眼 (36.9%) 和闭眼 (42.1%)。仅当使用更高的负荷（~25%）时，它们的值在男性中显着低于女性。然而，压力位移的前部和后部中心达到峰值的时间没有显着差异。这些发现表明，无论视觉条件如何，女性较重的负荷引起的姿势扰动都比男性大。这强调了负荷剂量在对外部引起的扰动的姿势反应幅度中的重要性。