Clinical Biomechanics Laboratory, Department of Physical Therapy, University of Chile, 8380453 Santiago, Chile.
Biomechanics and Kinesiology Laboratory, Hospital San José, 8380419 Santiago, Chile.
Sensors (Basel). 2020 May 1;20(9):2585. doi: 10.3390/s20092585.
The assessment of trunk sway smoothness using an accelerometer sensor embedded in a smartphone could be a biomarker for tracking motor learning. This study aimed to determine the reliability of trunk sway smoothness and the effect of visual biofeedback of sway smoothness on motor learning in healthy people during unipedal stance training using an iPhone 5 measurement system. In the first experiment, trunk sway smoothness in the reliability group ( = 11) was assessed on two days, separated by one week. In the second, the biofeedback group ( = 12) and no-biofeedback group ( = 12) were compared during 7 days of unipedal stance test training and one more day of retention (without biofeedback). The intraclass correlation coefficient score 0.98 (0.93-0.99) showed that this method has excellent test-retest reliability. Based on the power law of practice, the biofeedback group showed greater improvement during training days ( = 0.003). Two-way mixed analysis of variance indicates a significant difference between groups ( < 0.001) and between days ( < 0.001), as well as significant interaction ( < 0.001). Post hoc analysis shows better performance in the biofeedback group from training days 2 and 7, as well as on the retention day ( < 0.001). Motor learning objectification through visual biofeedback of trunk sway smoothness enhances postural control learning and is useful and reliable for assessing motor learning.
使用智能手机中嵌入的加速度计传感器评估躯干摆动平稳性可能是跟踪运动学习的生物标志物。本研究旨在确定使用 iPhone 5 测量系统进行单足站立训练期间，躯干摆动平稳性的可靠性以及摆动平稳性的视觉生物反馈对健康人运动学习的影响。在第一个实验中，可靠性组（n=11）在两天内评估了躯干摆动平稳性，间隔一周。在第二个实验中，比较了生物反馈组（n=12）和无生物反馈组（n=12）在 7 天的单足站立测试训练和 1 天的保留期（无生物反馈）中的表现。组内相关系数评分为 0.98（0.93-0.99），表明该方法具有极好的重测可靠性。基于练习的幂律，生物反馈组在训练日期间显示出更大的改善（ = 0.003）。双向混合方差分析表明组间（<0.001）和日间（<0.001）差异显著，以及显著的交互作用（<0.001）。事后分析表明，生物反馈组在训练日 2 和 7 以及保留日的表现更好（<0.001）。通过躯干摆动平稳性的视觉生物反馈客观化运动学习可以增强姿势控制学习，并且对于评估运动学习是有用且可靠的。
