Font-Farré Manel, Farche Ana Claudia Silva, de Medeiros Takahashi Anielle C, Guerra-Balic Myriam, Figueroa Arturo, Oviedo Guillermo R
Faculty of Psychology, Education and Sport Science Blanquerna, University Ramon Llull, Barcelona, Spain.
Department of Physiotherapy, Federal University of São Carlos, São Carlos, Brazil.
Front Physiol. 2021 Oct 15;12:702418. doi: 10.3389/fphys.2021.702418. eCollection 2021.
The analysis of the heart rate variability (HRV) consists of changes in the time intervals between consecutive R waves. It provides information on the autonomic nervous system regulation and it is a predictor of adverse cardiovascular events. Several studies analyzed this parameter in youth and adults with Intellectual Disability (ID). Nevertheless, there is a lack of information regarding the HRV before, during, and after exercise in older adults with ID. Therefore, we aimed to describe and compare the cardiac autonomic modulation before, during, and after the six-minute walk test (6MWT) in older adults with and without ID. Twenty-four volunteers with ID and 24 without ID (non-ID) participated in this study. HRV was assessed by R-R intervals at rest, during and after the 6MWT. At rest and recovery periods, the participants remained sited. The symbolic analysis was used to evaluate non-linear HRV components. The recovery HR kinetics was assessed by the mean response time, which is equivalent to time constant (τ)+time delay (TD). Between groups differences in HRV variables were not significant. During the recovery period, HR kinetics time variables showed significant better results in non-ID participants (TD: 6±5s vs. 15±11s; τ: 19±10s vs. 35±17s; and MRT: 25±9s vs. 50±11s, all <0.050). In conclusion, our results suggest that the HRV in older adults with and without ID is similar during rest, exercise, and recovery. Recovery HR kinetics after the 6MWT was slower in older adults with ID. The reason for these results may be a reduced post-exercise vagal rebound in older adults with ID.
心率变异性（HRV）分析包括连续R波之间时间间隔的变化。它提供有关自主神经系统调节的信息，并且是不良心血管事件的预测指标。多项研究分析了智障（ID）青年和成年人的这一参数。然而，关于ID老年成年人运动前、运动中和运动后的HRV信息匮乏。因此，我们旨在描述和比较有ID和无ID的老年成年人在六分钟步行试验（6MWT）前、中、后的心脏自主神经调节情况。24名有ID的志愿者和24名无ID（非ID）的志愿者参与了本研究。通过6MWT期间及之后休息时的R-R间期评估HRV。在休息和恢复期间，参与者保持坐姿。使用符号分析评估非线性HRV成分。通过平均反应时间评估恢复HR动力学，平均反应时间相当于时间常数（τ）+时间延迟（TD）。HRV变量在组间差异不显著。在恢复期间，HR动力学时间变量在非ID参与者中显示出显著更好的结果（TD：6±5秒对15±11秒；τ：19±10秒对35±17秒；MRT：25±9秒对50±11秒，均<0.050）。总之，我们的结果表明，有ID和无ID的老年成年人在休息、运动和恢复期间的HRV相似。6MWT后，有ID的老年成年人的恢复HR动力学较慢。这些结果的原因可能是有ID的老年成年人运动后迷走神经反弹减弱。
