Biomedical Engineering Institute, Kaunas University of Technology, 51423 Kaunas, Lithuania.
Sensors (Basel). 2019 May 7;19(9):2113. doi: 10.3390/s19092113.
Heart rate recovery (HRR) after physical exercise is a convenient method to assesscardiovascular autonomic function. Since stair climbing is a common daily activity, usually followedby a slow walking or rest, this type of activity can be considered as an alternative HRR test.The present study explores the feasibility to estimate HRR parameters after stair climbing usinga wrist-worn device with embedded photoplethysmography and barometric pressure sensors.A custom-made wrist-worn device, capable of acquiring heart rate and altitude, was used to estimatethe time-constant of exponential decay t, the short-term time constant S, and the decay of heart ratein 1 min D. Fifty-four healthy volunteers were instructed to climb the stairs at three different climbingrates. When compared to the reference electrocardiogram, the absolute and percentage errors werefound to be ≤ 21.0 s ( 52.7%) for , ≤ 0.14 (≤ 19.2%) for , and ≤ 7.16 bpm (≤ 20.7%) for in 75%of recovery phases available for analysis. The proposed approach to monitoring HRR parameters inan unobtrusive way may complement information provided by personal health monitoring devices(e.g., weight loss, physical activity), as well as have clinical relevance when evaluating the efficiencyof cardiac rehabilitation program outside the clinical setting.
运动后心率恢复（HRR）是评估心血管自主功能的一种便捷方法。由于爬楼梯是一种常见的日常活动，通常之后会进行缓慢的行走或休息，因此这种活动可以被视为替代 HRR 测试的方法。本研究探索了使用具有嵌入式光体积描记法和气压传感器的腕戴式设备来估计爬楼梯后 HRR 参数的可行性。一个定制的腕戴式设备，能够采集心率和海拔高度，用于估计指数衰减时间常数 t、短期时间常数 S 和心率在 1 分钟内的衰减 D。54 名健康志愿者被指示以三种不同的爬楼速度爬楼梯。与参考心电图相比，在可用于分析的 75%的恢复阶段中，对于 t，绝对误差和百分比误差均≤21.0 秒（≤52.7%），对于 ，绝对误差和百分比误差均≤0.14（≤19.2%），对于 D，绝对误差和百分比误差均≤7.16 bpm（≤20.7%）。这种以非侵入方式监测 HRR 参数的方法可以补充个人健康监测设备（例如，体重减轻、身体活动）提供的信息，并且在评估临床环境之外的心脏康复计划的效率时具有临床相关性。
