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Assessing the Quality of Heart Rate Variability Estimated from Wrist and Finger PPG: A Novel Approach Based on Cross-Mapping Method

机译：评估手腕和手指PPG估算的心率变异性的质量：一种基于交叉映射方法的新方法

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摘要

The non-invasiveness of photoplethysmographic (PPG) acquisition systems, together with their cost-effectiveness and easiness of connection with IoT technologies, is opening up to the possibility of their widespread use. For this reason, the study of the reliability of PPG and pulse rate variability (PRV) signal quality has become of great scientific, technological, and commercial interest. In this field, sensor location has been demonstrated to play a crucial role. The goal of this study was to investigate PPG and PRV signal quality acquired from two body locations: finger and wrist. We simultaneously acquired the PPG and electrocardiographic (ECG) signals from sixteen healthy subjects (aged 28.5 ± 3.5, seven females) who followed an experimental protocol of affective stimulation through visual stimuli. Statistical tests demonstrated that PPG signals acquired from the wrist and the finger presented different signal quality indexes (kurtosis and Shannon entropy), with higher values for the wrist-PPG. Then we propose to apply the cross-mapping (CM) approach as a new method to quantify the PRV signal quality. We found that the performance achieved using the two sites was significantly different in all the experimental sessions ( < 0.01), and the PRV dynamics acquired from the finger were the most similar to heart rate variability (HRV) dynamics.
机译：光电容积描记（PPG）采集系统的非侵入性，以及其成本效益和与物联网技术连接的简便性，为它们的广泛使用开辟了道路。因此，对PPG的可靠性和脉搏率可变性（PRV）信号质量的研究已引起了极大的科学，技术和商业兴趣。在这一领域，传感器的位置已被证明起着至关重要的作用。这项研究的目的是研究从两个身体部位（手指和手腕）获得的PPG和PRV信号质量。我们同时从16名健康受试者（年龄28.5±3.5，7名女性）中获取了PPG和心电图（ECG）信号，这些受试者遵循通过视觉刺激进行情感刺激的实验方案。统计测试表明，从手腕和手指获取的PPG信号呈现出不同的信号质量指标（峰度和香农熵），而手腕PPG的值更高。然后，我们建议将交叉映射（CM）方法作为量化PRV信号质量的新方法。我们发现，在所有实验阶段中，使用这两个位置实现的性能显着不同（<0.01），并且从手指获得的PRV动态与心率变异（HRV）动态最为相似。

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