Mechanisms used to increase propulsive forces on a treadmill in older adults.
Mechanisms used to increase propulsive forces on a treadmill in older adults.
复制标题
用于增加老年人跑步机上推进力的机制。
DOI：
10.1016/j.jbiomech.2020.110139
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发表时间：
2021-01-22
影响因子：
2.4
通讯作者：
Knarr BA
中科院分区：
文献类型：
--
作者：
Hedrick EA;Parker SM;Hsiao H;Knarr BA
与年轻人相比，老年人在地上行走的速度和推进力通常会下降。步行速度的降低是负面健康结果的风险因素。因此，本研究旨在确定自适应速度跑步机控制器对老年人步行速度和推进力的影响，包括不同条件下推进力变化的机制和策略。17名参与者完成了两种跑步机条件，一种是固定的舒适步行速度，另一种是自适应速度控制器。自适应速度跑步机控制器利用一组惯力、步态参数和基于位置的控制器来响应瞬时前惯性力。先前为中风后个体开发的基于生物力学的模型用于老年人，以确定增加速度时促进推进力变化的主要步态参数。与固定速度控制器条件下（0.98 m/s）相比，在自适应速度控制器条件下（1.20 m/s），参与者的平均行走速度更快；然而，这些速度不如地面上的速度（1.44米/秒）快。虽然平均尾肢角（TLA） （p<0.001）和踝关节力矩（p=0.020）随着跑步机速度的增加而增加，但在更快的跑步机速度下，TLA的增加对推进力的增加贡献更大。我们的研究结果表明，与固定速度跑步机相比，老年人在自适应速度跑步机上行走时选择了更快的行走速度和更大的推进力，这表明自适应速度跑步机控制器有可能成为老年人当前运动干预措施的有益替代方案。
Older adults typically demonstrate reductions in overground walking speeds and propulsive forces compared to young adults. These reductions in walking speeds are risk factors for negative health outcomes. Therefore, this study aimed to determine the effect of an adaptive speed treadmill controller on walking speed and propulsive forces in older adults, including the mechanisms and strategies underlying any change in propulsive force between conditions. Seventeen participants completed two treadmill conditions, one with a fixed comfortable walking speed and one with an adaptive speed controller. The adaptive speed treadmill controller utilized a set of inertial-force, gait parameters, and position-based controllers that respond to an instantaneous anterior inertial force. A biomechanical-based model previously developed for individuals post-stroke was implemented for older adults to determine the primary gait parameters that contributed to the change in propulsive forces when increasing speed. Participants walked at faster average speeds during the adaptive speed controller (1.20 m/s) compared to the fixed speed controller conditions (0.98 m/s); however, these speeds were not as fast as their overground speed (1.44 m/s). Although average trailing limb angle (TLA) (p<0.001) and ankle moment (p=0.020) increased when speed also increased between treadmill conditions, increasing TLA contributed more to the increased propulsive forces seen during faster treadmill speeds. Our findings show that older adults chose faster walking speeds and increased propulsive force when walking on an adaptive speed treadmill compared to a fixed speed treadmill, suggesting that an adaptive speed treadmill controller has the potential to be a beneficial alternative to current exercise interventions for older adults.
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