Changes in Heart Rate Recovery (T30) on Cardiac Rehabilitation in Patients after Coronary Artery Bypass Surgery.
- VernacularTitle:冠動脈バイパス術後患者の心臓リハビリテーションにおける運動後心拍数減衰応答（Ｔ３０）の変化
- Author:
SHINJI SATO
;
MAYUMI TAKAHASHI
;
SHIGERU MAKITA
- Publication Type:Journal Article
- Keywords:
heart rate recovery;
autonomic nervous system;
cardiac rehabilitation;
coronary artery bypass grafting
- From:Japanese Journal of Physical Fitness and Sports Medicine
2002;51(3):275-281
- CountryJapan
- Language:Japanese
-
Abstract:
The time constants of beat-by-beat heart rate decay for the first 30 seconds (T30) after exercise is a specific index for the vagally mediated component of heart rate recovery. The aim of our study was to determine whether cardiac rehabilitation (CR) can accelerate T30 in patients after coronary artery bypass grafting (CABG) . Thirteen male patients who underwent CABG (aged 60.5±7.7years) were assigned to 7-21 day Phase I CR. Exercise training consisted of 30 minutes of aerobic exercise (bicycle ergometer) at the anaerobic threshold 2 times per day. T30 was measured as the heart rate decay regulated in patients who rested immediately after 5 minutes of pedaling exercise. After CR, T30 significantly improved from 413.3±129.7 to 300.1±124.5 sec (p<0.01) . Peak oxygen uptake (peak V02: 14.0±4.0 16.7±3.2mlin/kg: p<0.01) and heart rate at anaerobic threshold (HR @ AT: 111.9±13.4 103.6±11.7 beatsin: p<0.01) also improved significantly. There was no correlation between ΔT30 (Δ: difference before and after CR) and Δpeak VO2or ΔHR @ AT. These results suggest that CR for patients following CABG accelerates vagally mediated heart rate recovery after dynamic exercise.
