Training Propulsion via Acceleration of the Trailing Limb
Training Propulsion via Acceleration of the Trailing Limb
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DOI：
10.1109/tnsre.2020.3032094
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发表时间：
2020-12-01
影响因子：
4.9
通讯作者：
Sergi, Fabrizio
中科院分区：
文献类型：
--
作者：
Farrens, Andria J.;Lilley, Maria;Sergi, Fabrizio
步行功能是进行许多日常生活活动的关键，通常通过步行速度进行评估。步行速度取决于推进力，而推进力由踝关节力矩和蹬离时的后肢姿势决定。在这里，我们提出了一种新的步态训练模式，利用双带跑步机，通过加速推进的拖曳肢体在推离带训练两个组件。加速要求参与者产生更大的推进力来抵消惯性效应，并通过增加带速度来增加拖曳肢体的伸展。我们假设在这种模式下的一次训练会产生推进力学的后效，从而影响步行速度。我们在两个加速度幅度-7 m/s（2）（HA）和2 m/s（2）（LA）-对健康年轻人进行了测试，并将其结果与第三个对照组（VC）进行了比较，后者在训练期间以更高的速度行走。结果显示，HA组在训练后显著增加了步行速度（平均值+/- s.e.m：0.073 +/- 0.013 m/s，p < 0.001）。LA和VC组的步行速度变化不显著（LA：0.032 +/- 0.013 m/s，VC：-0.003 +/- 0.013 m/s）。应答者分析显示，与LA和VC组相比，HA组的蹬离姿势和踝关节跖屈肌激活的变化导致步态速度增加更大。训练后效应的持续时间表明，神经运动协调的测量变化与使用依赖性学习一致。
Walking function, which is critical to performing many activities of daily living, is commonly assessed by walking speed. Walking speed is dependent on propulsion, which is governed by ankle moment and the posture of the trailing limb during push-off. Here, we present a new gait training paradigm that utilizes a dual belt treadmill to train both components of propulsion by accelerating the belt of the trailing limb during push-off. Accelerations require participants to produce greater propulsive force to counteract inertial effects, and increases extension of the trailing limb through increased belt velocity. We hypothesized that one session of training in this paradigm would produce after effects in propulsion mechanics and, consequently, walking speed. We tested the training paradigm on healthy young adults at two acceleration magnitudes-7 m/s(2) (HA) and 2 m/s(2) (LA)-and compared their results to a third control group (VC) that walked at a higher velocity during training. Results show that the HA group significantly increased walking speed following training (mean +/- s.e.m: 0.073 +/- 0.013 m/s, p < 0.001). The change in walking speed in the LA and VC groups was not significant (LA: 0.032 +/- 0.013 m/s, VC: -0.003 +/- 0.013 m/s). Responder analysis showed that changes in push-off posture and in activation of ankle plantar-flexor muscles contributed to the greater increases in gait speed measured in the HA group compared to the LA and VC groups. The duration of after effects post training suggest that the measured changes in neuromotor coordination are consistent with use-dependent learning.