Heart Rate Variability analysis of chronotropic response to exercise in rickshaw-pullers
Journal Title: International Journal of Applied Exercise Physiology - Year 2018, Vol 7, Issue 3
Abstract
Heart rate variability (HRV) reflects a healthy autonomic nervous system and is increased with endurance physical training. This study aimed to quantify the cardiovascular system regulation in terms of heart rate variability under a physiological stress-acute graded and controlled exercise in chronic rickshaw pullers. Primary focus of the study was on the recovery of HRV parameters after the exercise. Forty healthy male subjects were included in the study. Twenty of them were rickshaw-pullers, who had been engaged in active cycling for more than 10 years and they constituted the aerobic training model or experimental group. Twenty other healthy male sedentary male constituted the control group. After 15 min supine rest standard limb lead I was used for recording entire epoch of ECG for HRV. ECG was recorded at rest, during exercise and immediately after termination of exercise in supine position for 6 min at spontaneous respiration. Acute exercise testing was done by automated bicycle ergometer in supine position for 6 minutes. It had automated load increment program. Initial load was 25W and at every 2-min of intervals it was increased by 25W and finally reached up to 100W. Constant frequency of paddling was maintained during the period of six minutes exercise. Along with continuous ECG recording simultaneously blood pressure and heart rate were also measured at every 2 min of intervals. The ECG and respiratory signals were recorded at the sample rate of 4000 Hz for each signal. The ectopic beats or artefacts of ECG were excluded by visual inspection of entire recording. Recovery of SDNN was less in rickshaw pullers than in the controls (p<0.05). Both the groups showed significant difference in power (nu) of HF, when compared the resting vs exercise vs recovery (p<0.001) Significant difference were observed in power (nu) of HF, when compared the exercise-resting vs recovery- exercise vs recovery-resting (p<0.001) From this study it was concluded that the rickshaw pullers were found to be physically well trained as evidenced by faster recovery in heart rate and heart rate variability (LF and HF). The normalised units of LF or HF are found to be better indicator of recovery from exercise than the SDNN.
Authors and Affiliations
Jha A, Paudel BH
Keywords
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- EP ID EP570190
- DOI 10.30472/ijaep.v7i3.260
- Views 54
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