Department of Kinesiology and Health, Georgia State University, Atlanta, GA, USA.
School of Medicine, Emory University, Atlanta, GA, USA.
J Appl Biomech. 2023 Oct 27;40(1):66-72. doi: 10.1123/jab.2023-0041. Print 2024 Feb 1.
Treadmill walking has been used as a surrogate for overground walking to examine how load carriage affects gait. The validity of using treadmill walking to investigate load carriage's effects on stability has not been established. Thirty young adults were randomized into 3 front-loaded groups (group 1: 0%, 2: 10%, or 3: 20% of bodyweight). Participants carried their load during overground and treadmill walking. Dynamic gait stability (primary outcome) was determined for 2 gait events (touchdown and liftoff). Secondary variables included step length, gait speed, and trunk angle. Groups 1 and 2 demonstrated similar stability between walking surfaces. Group 3 was less stable during treadmill walking than overground (P ≤ .005). Besides trunk angle, all secondary outcomes were similar between groups (P > .272) but different between surfaces (P ≤ .001). The trunk angle at both events showed significant group- and surface-related differences (P ≤ .046). Results suggested that walking with an anterior load of up to 10% bodyweight causes comparable stability between surfaces. A 20% bodyweight front load could render participants less stable on the treadmill than overground. This indicates that anteriorly loaded treadmill walking may not be interchangeable with overground walking concerning stability for anterior loads of 20% bodyweight.
treadmill 行走已被用作模拟地面行走，以研究负荷携带如何影响步态。使用 treadmill 行走来研究负荷携带对稳定性的影响的有效性尚未得到证实。30 名年轻人被随机分为 3 个前加载组（组 1：0%、2：10%或 3：20%体重）。参与者在地面和 treadmill 行走时携带他们的负载。动态步态稳定性（主要结果）是在 2 个步态事件（触地和离地）下确定的。次要变量包括步长、步态速度和躯干角度。组 1 和 2 在行走表面之间表现出相似的稳定性。组 3 在 treadmill 行走时比地面行走时更不稳定（P ≤.005）。除了躯干角度外，所有次要结果在组间相似（P >.272）但在表面间不同（P ≤.001）。在两个事件中，躯干角度都显示出显著的组间和表面相关差异（P ≤.046）。结果表明，携带高达 10%体重的前负荷在表面之间会导致相似的稳定性。20%体重的前负荷可能会使参与者在 treadmill 上比在地面上更不稳定。这表明，对于 20%体重的前负荷，带负荷的 treadmill 行走可能与地面行走在稳定性方面不能互换。
