Saengsuwan Jittima, Brockmann Lars, Schuster-Amft Corina, Hunt Kenneth J
The Laboratory for Rehabilitation Engineering, Institute for Human Centred Engineering, Bern University of Applied Sciences, Biel, Switzerland.
Department of Physical Medicine and Rehabilitation, Faculty of Medicine, Khon Kaen University, Khon Kaen, Thailand.
Biomed Eng Online. 2024 Dec 26;23(1):132. doi: 10.1186/s12938-024-01328-7.
The aim of this study was to evaluate the feasibility of using a biofeedback-enhanced robotics-assisted tilt table (RATT) to investigate time- and intensity-dependent changes in heart rate variability (HRV) at rest and during heart rate-controlled exercise in patients recovering from a stroke. Twelve patients (age 55.3 years ± 15.6 years, 7 women) completed two separate measurement sessions. The first involved familiarization and system identification to determine parameters of a feedback system for automatic control of heart rate (HR). The second comprised 14 min of rest and 21 min of active exercise during which HR was held constant using feedback control to eliminate cardiovascular drift. HR data were collected using a chest-belt HR sensor, and raw RR intervals were employed for HRV analysis during periods of rest (0-7 min and 7-14 min) and exercise (5-13 min and 13-21 min). A biofeedback-enhanced, robotics-assisted tilt table can be successfully employed to perform heart rate-controlled exercises in patients after a stroke. All HRV metrics were substantially lower during exercise compared to rest. In the rest period, HRV values during 0-7 min were lower than during 7-14 min, in line with a slight HR decrease over the entire rest period. During exercise, HRV values during 5-13 min were higher than during 13-21 min, suggesting a time-dependent HRV decrease. All HRV metrics exhibited intensity- and time-dependent changes: higher HRV at rest and decreasing HRV over time. Understanding these HRV characteristics will support the development of heart rate-controlled exercise regimens and protocols for examining HRV changes during exercise in patients.
本研究的目的是评估使用生物反馈增强型机器人辅助倾斜台（RATT）来研究中风康复患者静息状态下以及心率控制运动期间心率变异性（HRV）随时间和强度的变化的可行性。12名患者（年龄55.3岁±15.6岁，7名女性）完成了两个独立的测量环节。第一个环节包括熟悉和系统识别，以确定用于自动控制心率（HR）的反馈系统的参数。第二个环节包括14分钟的静息和21分钟的主动运动，在此期间使用反馈控制使心率保持恒定以消除心血管漂移。使用胸带式心率传感器收集心率数据，并在静息期（0 - 7分钟和7 - 14分钟）和运动期（5 - 13分钟和13 - 21分钟）采用原始RR间期进行HRV分析。生物反馈增强型机器人辅助倾斜台可成功用于中风后患者的心率控制运动。与静息相比，运动期间所有HRV指标均显著降低。在静息期，0 - 7分钟期间的HRV值低于7 - 14分钟期间，这与整个静息期心率略有下降一致。在运动期间，5 - 13分钟期间的HRV值高于13 - 21分钟期间，表明HRV随时间下降。所有HRV指标均呈现出强度和时间依赖性变化：静息时HRV较高，且随时间降低。了解这些HRV特征将有助于制定心率控制运动方案和协议，以检查患者运动期间的HRV变化。
