Laboratoire IRISSE - EA4075, UFR des Sciences de l'Homme et de l'Environnement, Université de la Réunion, 117 rue du Général Ailleret, 97430, Le Tampon, Ile de la Réunion, France.
Mouvement - Interactions - Performance, MIP, Le Mans Université, EA 4334, 72000, Le Mans, France.
Sci Rep. 2021 Oct 7;11(1):19969. doi: 10.1038/s41598-021-99519-y.
Recent evidence suggests that during volitional stepping older adults control whole-body angular momentum (H) less effectively than younger adults, which may impose a greater challenge for balance control during this task in the elderly. This study investigated the influence of aging on the segment angular momenta and their contributions to H during stepping. Eighteen old and 15 young healthy adults were instructed to perform a series of stepping at two speed conditions: preferred and as fast as possible. Full-body kinematics were recorded to compute angular momenta of the trunk, arms and legs and their contributions to total absolute H on the entire stepping movement. Results indicated that older adults exhibited larger angular momenta of the trunk and legs in the sagittal plane, which contributed to a higher sagittal plane H range during stepping compared to young adults. Results also revealed that older adults had a greater trunk contribution and lower leg contribution to total absolute H in the sagittal plane compared to young adults, even though there was no difference in the other two planes. These results stress that age-related changes in H control during stepping arise as a result of changes in trunk and leg rotational dynamics.
最近的证据表明，在自主跨步时，老年人对整个身体角动量（H）的控制不如年轻人有效，这可能会对老年人在这项任务中的平衡控制造成更大的挑战。本研究调查了衰老对跨步时分段角动量及其对 H 的贡献的影响。18 名老年和 15 名年轻健康成年人被要求以两种速度条件进行一系列跨步：尽可能快和偏好速度。记录全身运动学以计算躯干、手臂和腿部的角动量及其对整个跨步运动的总绝对 H 的贡献。结果表明，与年轻人相比，老年人在矢状面的躯干和腿部具有更大的角动量，这导致跨步时矢状面 H 范围更高。结果还表明，与年轻人相比，老年人在矢状面的总绝对 H 中，躯干的贡献更大，小腿的贡献更小，尽管在其他两个平面上没有差异。这些结果强调了在跨步过程中 H 控制的与年龄相关的变化是由于躯干和腿部旋转动力学的变化引起的。
