Kim Ji-Hyun, Choe Yu-Ri, Song Min-Keun, Choi In-Sung, Han Jae-Young
Department of Physical and Rehabilitation Medicine, Regional Cardiocerebrovascular Rehabilitation Center-Research Institute of Medical Sciences, Chonnam National University Medical School & Hospital, Gwangju, Korea.
Department of Physical and Rehabilitation Medicine, Gwangju Veterans Hospital, Gwangju, Korea.
Ann Rehabil Med. 2017 Dec;41(6):1039-1046. doi: 10.5535/arm.2017.41.6.1039. Epub 2017 Dec 28.
To determine whether heart rate recovery (HRR) following an exercise tolerance test (ETT) is correlated with a changing ratio of peak oxygen consumption (VO) and maximal metabolic equivalents (MET).
A total of 60 acute myocardial infarction (AMI) patients who underwent ETT at both assessment points - 3 weeks (T0) after the AMI attack and 3 months after T0 (T1) were included. After achieving a peak workload, the treadmill was stopped with a 5-minute cooldown period, and the patients recovered in a comfortable and relaxed seated position. HRR was defined as the difference between the maximal heart rate (HR) and the HR measured at specific time intervals - immediately after the cool down period (HRR-0) and 3 minutes after the completion of the ETT (HRR-3).
HRR-0 and HRR-3 increased over time, whereas VO and MET did not show significant changes. There was a positive correlation between HRR at T0 and the exercise capacity at T0. HRR at T0 also showed a positive correlation with the exercise capacity at T1. There was no significant correlation between HRR measured at T0 and the change in the ratio of VO and MET, as calculated by subtracting VO and MET obtained at T0 from those obtained at T1, divided by VO at T0 and multiplied by 100.
Post-exercise HRR measured at 3 weeks after the AMI onset can reflect the exercise capacity 3 months after the first ETT. However, it may be difficult to correlate post-exercise HRR at T0 with the degree of increase in cardiopulmonary exercise capacity in patients with AMI.
确定运动耐量试验（ETT）后的心率恢复（HRR）是否与峰值耗氧量（VO）和最大代谢当量（MET）的变化率相关。
纳入60例急性心肌梗死（AMI）患者，他们在两个评估点——AMI发作后3周（T0）和T0后3个月（T1）均接受了ETT。达到峰值工作量后，跑步机停止，进行5分钟的冷却期，患者在舒适放松的坐姿下恢复。HRR定义为最大心率（HR）与在特定时间间隔测量的心率之差——冷却期结束后立即测量的心率（HRR-0）和ETT完成后3分钟测量的心率（HRR-3）。
HRR-0和HRR-3随时间增加，而VO和MET没有显著变化。T0时的HRR与T0时的运动能力呈正相关。T0时的HRR与T1时的运动能力也呈正相关。T0时测量的HRR与VO和MET比值的变化之间没有显著相关性，该比值通过用T1时获得的VO和MET减去T0时获得的VO和MET，除以T0时的VO并乘以100来计算。
AMI发作后3周测量的运动后HRR可反映首次ETT后3个月的运动能力。然而，对于AMI患者，可能难以将T0时的运动后HRR与心肺运动能力的增加程度相关联。
