Warfighter performance may be compromised through the impact of load carriage on dynamic postural stability. Men and women may experience this impact to differing extents due to postural stability differences. Therefore, the authors investigated the effect of load magnitude on dynamic postural stability in men and women during a landing and stabilization task. Dynamic postural stability of 32 subjects (16 women) was assessed during the unilateral landing of submaximal jumps under 3 load conditions: +0%, +20%, and +30% body weight. Dynamic postural stability was measured using the dynamic postural stability index, which is calculated from ground reaction force data sampled at 1200 Hz. Two-way mixed-measures analysis of variance compared dynamic postural stability index scores between sexes and loads. Dynamic postural stability index scores were significantly affected by load (P = .001) but not by sex or by the sex by load interaction (P > .05). Dynamic postural stability index scores increased between the 0% (0.359 ± 0.041), 20% (0.396 ± 0.034), and 30% (0.420 ± 0.028) body weight conditions. Increased load negatively affects dynamic postural stability with similar performance decrements displayed by men and women. Men and women warfighters may experience similar performance decrements under load carriage conditions of similar relative magnitudes.

中文翻译：

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承载量增加时动态姿势稳定性受损。

负载运输对动态姿势稳定性的影响可能会影响作战人员的性能。由于姿势稳定性差异，男性和女性可能会不同程度地经历这种影响。因此，作者研究了在着陆和稳定任务期间负载大小对男性和女性动态姿势稳定性的影响。在 3 种负载条件下，对 32 名受试者（16 名女性）在次最大跳跃单侧着陆期间的动态姿势稳定性进行了评估：+0%、+20% 和 +30% 体重。使用动态姿势稳定性指数来测量动态姿势稳定性，该指数是根据以 1200 Hz 采样的地面反作用力数据计算得出的。双向混合测量方差分析比较了性别和负载之间的动态姿势稳定性指数得分。动态姿势稳定性指数得分显着受负荷影响 (P = .001)，但不受性别或性别与负荷相互作用的影响 (P > .05)。动态姿势稳定性指数得分在0%（0.359±0.041）、20%（0.396±0.034）和30%（0.420±0.028）体重条件下增加。负荷增加会对动态姿势稳定性产生负面影响，男性和女性表现出类似的表现下降。在类似相对量值的负载运输条件下，男性和女性战士可能会经历类似的性能下降。