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Rehabilitation Practice and Science

Translated Title

運動訓練可促進節律性不足之冠狀動脈疾病患者的體能並改善運動時的心跳率

Abstract

This study investigated whether coronary artery disease patients with chronotropic incompetence (CI) can significantly improve their functional capacity after exercise training. Forty-two men (mean age: 55.3±9.3yr) underwent coronary revascularization and without beta-blockade participated in a threemonth outpatient exercise training program. Patients were separated into a CI group (n=18) and a non-CI group (n=24) based on whether they could reach 85% of the age-predicted peak heart rate (HR). Chronotropic incompetence was defined as failure to achieve 85% of the age-predicted maximal HR. Bicycle exercise workouts were conducted three times weekly. The exercise duration was 30 minutes per session included 5 minutes warm up and 5 minutes cool down, and the exercise intensity was adjusted to the subject's ventilatory threshold (VeT). Graded exercise tests with gas analysis were conducted before and after training to evaluate changes in cardiorespiratory function. Before training, the CI group displayed lower peak oxygen uptake (VO(subscript 2peak)), HR and work rate than the non-CI group (p＜0.01). After training, the VO(subscript 2pea)k increased from 19.5±3.4 to 25.1±5.5 mL•kg-1•min^(-1) in the CI group, while it increased from 22.0±3.9 to 25.4±5.4 mL•kg^(-1)•min^(-1) in the non-CI group. At VeT, the CI group also displayed greater increase in VO2 than the non-CI group. In conclusion, although pre-training V O(subscript 2peak) was lower for the CI group than the non-CI group, both groups can achieve a similar level of functional capacity. CI thus appears not to be a limiting factor for improvement during cardiac rehabilitation.

Language

English

First Page

189

Last Page

196

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