Thanathornwong Bhornsawan, Suebnukarn Siriwan
Faculty of Dentistry, Srinakarinwirot University, Bangkok, Thailand.
Faculty of Dentistry, Thammasat University, Pathumthani, Thailand.
Stud Health Technol Inform. 2015;216:756-60.
Dentists are subject to staying in static or awkward postures for long periods due to their highly concentrated work.
This study describes a real-time personalized biofeedback system developed for dental posture training with the use of vibrotactile biofeedback.
The real-time personalized biofeedback system was an integrated solution that comprised of two components: 1) a wearable device that contained an accelerometer sensor for measuring the tilt angle of the body (input) and provided real-time vibrotactile biofeedback (output); and 2) software for data capturing, processing, and personalized biofeedback generation. The implementation of real-time personalized vibrotactile feedback was computed using Hidden Markov Models (HMMs). For the test case, we calculated the probability and log-likelihood of the test movements under the Work related Musculoskeletal Disorders (WMSD) and non-WMSD HMMs. The vibrotactile biofeedback was provided to the user via a wearable device for a WMSD-predicted case. In the system evaluation, a randomized crossover trial was conducted to compare dental posture measure using tilt angles of the upper back and muscle activities of those dental students that received vibrotactile biofeedback from the system with the control group against the dental students who received no feedback.
The participants who received feedback from the system had a lower tilt angle at 10th, 50th, and 90th percentiles of Backx and Backy, as well as muscular load, which were statistically different (p<0.05) from those who received no feedback from the system.
The results presented here demonstrate that a personalized biofeedback system for posture training in dental students is feasible and associated with quantitative improvements of the dental posture.
由于工作高度集中，牙医需要长时间保持静态或不自然的姿势。
本研究描述了一种利用振动触觉生物反馈为牙科姿势训练开发的实时个性化生物反馈系统。
实时个性化生物反馈系统是一个集成解决方案，由两个部分组成：1）一个可穿戴设备，其中包含一个用于测量身体倾斜角度（输入）并提供实时振动触觉生物反馈（输出）的加速度计传感器；2）用于数据捕获、处理和个性化生物反馈生成的软件。实时个性化振动触觉反馈的实现使用隐马尔可夫模型（HMM）进行计算。对于测试案例，我们计算了与工作相关的肌肉骨骼疾病（WMSD）和非WMSD隐马尔可夫模型下测试动作的概率和对数似然。通过可穿戴设备为预测为WMSD的案例向用户提供振动触觉生物反馈。在系统评估中，进行了一项随机交叉试验，以比较使用上背部倾斜角度和接受系统振动触觉生物反馈的牙科学生的肌肉活动来测量牙科姿势，与未接受反馈的对照组牙科学生进行比较。
从系统中获得反馈的参与者在Backx和Backy的第10、50和90百分位数处的倾斜角度以及肌肉负荷较低，与未从系统中获得反馈的参与者相比，在统计学上有显著差异（p<0.05）。
此处呈现的结果表明，用于牙科学生姿势训练的个性化生物反馈系统是可行的，并且与牙科姿势的定量改善相关。
