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- Title
Effects of Circuit Exercises on Heart Rate and Qt Interval Among Young Adults in Malaysia.
- Authors
Phan, A. Y.; Padmavathy, K. M.; Noorzaid, M.
- Abstract
Introduction: Vigorous exercise can acutely increase the risk of cardiovascular event during or immediately after exertion in young adults. Sympathetic withdrawal with parasympathetic reactivation contributes to heart rate recovery, thus resulting in lengthening of QT interval. An exercise electrocardiogram (ECG) screening is suggested to observe if the circuit exercises can further trigger a more extensive cardiovascular event. The study aimed to investigate the immediate effects of circuit exercises on heart rate and QT interval in young adults. Methods: 100 healthy subjects aged between 18 to 24 participated in this study. All subjects underwent two different circuit exercises: upper limb isotonic circuit and lower limb isotonic circuit exercises. A baseline ECG and post-exercise ECG after completion of each circuit exercise were recorded immediately. Paired t-test was used to compare the pre- and post-circuit exercises while independent t-test was used to compare between pre- and post-upper and lower limb circuit exercise. Results: The mean heart rate rises significantly after the circuit exercises, and the lower limb circuit exercise increases the heart rate more than the upper limb circuit exercise. The study found a significant (p<0.05) decrease of QT interval duration after both circuit exercises of upper and lower limb when compared to pre-exercise values. QT interval duration reduced from 0.33 seconds to 0.30 seconds and 0.29 seconds after the upper limb circuit exercise and lower limb circuit exercises. There was no prolongation of QT interval duration observed after both isometric and isotonic circuit exercises training. Conclusion: Immediately after the circuit exercise, there are changes of heart rate and QT interval duration. The shortening of the QT interval duration after exercise is due to the increased heart rate. Despite that, the risk of exercise should not be overestimated, and strategies need to be taken to reduce acute cardiovascular events.
- Subjects
MALAYSIA; HEART beat; YOUNG adults; EXERCISE therapy; WARMUP; COOLDOWN
- Publication
Malaysian Journal of Medicine & Health Sciences, 2024, Vol 20, p69
- ISSN
1675-8544
- Publication type
Abstract