Program in Physical Therapy, Washington University School of Medicine, St. Louis, MO 63110, USA.
Department of Kinesiology, University of Alabama, Tuscaloosa, AL 35487, USA.
Sensors (Basel). 2020 Oct 9;20(20):5738. doi: 10.3390/s20205738.
The aim was to examine the validity of heart rate variability (HRV) measurements from photoplethysmography (PPG) via a smartphone application pre- and post-resistance exercise (RE) and to examine the intraday and interday reliability of the smartphone PPG method. Thirty-one adults underwent two simultaneous ultrashort-term electrocardiograph (ECG) and PPG measurements followed by 1-repetition maximum testing for back squats, bench presses, and bent-over rows. The participants then performed RE, where simultaneous ultrashort-term ECG and PPG measurements were taken: two pre- and one post-exercise. The natural logarithm of the root mean square of successive normal-to-normal (R-R) differences (LnRMSSD) values were compared with paired-sample -tests, Pearson product correlations, Cohen's effect sizes (ESs), and Bland-Altman analysis. Intra-class correlations (ICC) were determined between PPG LnRMSSDs. Significant, small-moderate differences were found for all measurements between ECG and PPG: Base (ES = 0.42), Base (0.30), RE (0.26), RE (0.36), and RE (1.14). The correlations ranged from moderate to very large: Base ( = 0.59), Base ( = 0.63), RE ( = 0.63), RE ( = 0.76), and RE ( = 0.41)-all < 0.05. The agreement for all the measurements was "moderate" (0.10-0.16). The PPG LnRMSSD exhibited "nearly-perfect" intraday reliability (ICC = 0.91) and "very large" interday reliability (0.88). The smartphone PPG was comparable to the ECG for measuring HRV at rest, but with larger error after resistance exercise.
目的是检验智能手机应用程序中通过光体积描记法（PPG）测量心率变异性（HRV）在抗阻运动（RE）前后的有效性，并检验智能手机 PPG 方法的日内和日间可靠性。31 名成年人同时进行超短期心电图（ECG）和 PPG 测量，然后进行 1 次最大重复测试，测试动作包括深蹲、卧推和俯身划船。然后，参与者进行 RE，同时进行超短期 ECG 和 PPG 测量：运动前进行 2 次，运动后进行 1 次。比较了自然对数的均方根差的连续正常到正常（R-R）差异（LnRMSSD）值与配对样本 t 检验、Pearson 积差相关、Cohen's 效应大小（ES）和 Bland-Altman 分析。还确定了 PPG LnRMSSD 之间的组内相关系数（ICC）。ECG 和 PPG 之间的所有测量均存在显著的小到中度差异：基础（ES = 0.42）、基础（0.30）、RE（0.26）、RE（0.36）和 RE（1.14）。相关性从中度到非常大：基础（ = 0.59）、基础（ = 0.63）、RE（ = 0.63）、RE（ = 0.76）和 RE（ = 0.41），所有都 < 0.05。所有测量的一致性为“中度”（0.10-0.16）。PPG LnRMSSD 表现出“几乎完美”的日内可靠性（ICC = 0.91）和“非常大”的日间可靠性（0.88）。智能手机 PPG 在测量静息时的 HRV 方面与 ECG 相当，但在抗阻运动后误差更大。
