即時HRV分析系統發展及其應用於生物回饋系統

Abstract

目前臨床上許多研究發現失眠、焦慮或輕度憂鬱症等疾病都與心率變異有著密切的相關性，所以為了研究生物回饋是否能夠調節心率變異，進而舒緩現代人因為壓力而產生的許多身心問題，我們需要一具有生物回饋功能的即時心率偵測系統，所以本論文主要目的為設計並製作一即時心率偵測和生物回饋之系統，進而探討聲音和影像生物回饋訊號對心率變異的影響。本系統是以MATLAB為架構基礎，並利用它所提供的Simulink 及Real-Time Workshop 等開發工具設計出一個完整的即時心率偵測和生物回饋系統，其中在生物回饋系統部分是以高低頻功率比作為生物回饋的指標。最後我們從實驗結果發現到透過生物回饋確實可以影響人體自律神經系統的平衡，並發現透過影像生物回饋的方式會比聲音生物回饋的方式更容易去調控心率變異特性。

Clinical reports have shown that problems like insomnia, anxiety, or melancholia mostly relate to the factor of heart rate variation (HRV). In order to reduce stress of the modern life, this study was aimed to investigate the effectiveness of regulating HRV by biological feedback. Accordingly, a real-time HRV analyzer were developed to support the biological feedback function. In addition, we evaluated the efficacy of using different feedback signals (sound and image) on the HRV regulation. The system (called “HRV-based biofeedback system”) was developed under the Matlab environment, with the tools of Simulink and Real-Time Workshop (RTW). The ratio of high- to low-frequency power was used as the biofeedback signal. Our results demonstrate that appropriate biofeedback mechanism indeed improves the autonomous nerve response. Moreover, image cue (visual stimulus) provides more efficient way of regulating the HRV behavior.