Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, USA.
Department of Physical Therapy, Marquette University, Milwaukee, Wisconsin, USA.
J Biomech. 2014 May 7;47(7):1739-41. doi: 10.1016/j.jbiomech.2014.03.008. Epub 2014 Mar 14.
Visual biofeedback of tibial peak positive acceleration (PPA) during running has been used successfully as a method of gait retraining to reduce PPAs. Audio biofeedback generated from PPA may present a novel, portable alternative. The purpose of this study was to investigate the feasibility of using PPA-generated audio biofeedback to reduce PPAs while running. Nine runners were fitted with a wireless accelerometer on their left tibia. PPAs were recorded and a custom LabVIEW program was used to emit a single beep once the PPA reached a preset threshold. The numerical difference between this threshold and peak PPA during running was scaled to the pitch of the beep, such that a foot strike with greater PPA would result in a beep with higher pitch. Subjects were then instructed to (1) run without any beeps, and/or (2) keep the pitch of the beep as low as possible. Subjects participated in a single testing session that included a five minute warm-up and two rounds of biofeedback, which consisted of five minutes of running with biofeedback followed by five minutes of running without biofeedback. Subjects were able to significantly reduce PPAs during exposure to audio biofeedback. In addition, two rounds of biofeedback were sufficient for subjects to retain a reduction in PPAs without biofeedback. PPA-generated audio biofeedback therefore appears to be a feasible method of gait retraining to reduce PPAs in runners.
在跑步过程中，胫骨峰值正加速度（PPA）的视觉生物反馈已被成功用作步态再训练的方法，以降低 PPA。PPA 产生的音频生物反馈可能是一种新颖的、便携式的替代方法。本研究的目的是探讨使用 PPA 产生的音频生物反馈来降低跑步时 PPA 的可行性。九名跑步者在左胫骨上安装了一个无线加速度计。记录 PPA，并使用自定义的 LabVIEW 程序在 PPA 达到预设阈值时发出一声哔哔声。这个阈值和跑步过程中的峰值 PPA 之间的数值差异被调整为哔哔声的音高，因此具有更大 PPA 的足触地将产生更高音高的哔哔声。然后，要求受试者（1）在没有任何哔哔声的情况下跑步，和/或（2）使哔哔声的音高尽可能低。受试者参加了一个单一的测试会议，包括五分钟的热身和两轮生物反馈，其中包括五分钟的生物反馈跑步和五分钟的无生物反馈跑步。受试者在接受音频生物反馈时能够显著降低 PPA。此外，两轮生物反馈足以使受试者在没有生物反馈的情况下保持 PPA 的降低。因此，PPA 产生的音频生物反馈似乎是一种可行的步态再训练方法，可以降低跑步者的 PPA。
