The effects of exercise mode on heart rate variability during the same relative exercise intensities
Conference Contribution ResearchOnline@JCUAbstract
During rest and exercise, heart rate (HR) fluctuates by approximately 2-7%. These normal fluctuations have been termed heart rate variability (HRV) and proposed to reflect the neural control of HR function. Previously, it was reported that HRV was similar at the same relative intensities during steady-state exercise but the influence of exercise mode has not been examined. Subsequently, the current study examined time and frequency domain measures of HRV during moderate exercise intensities of different modes. Seventeen, healthy active male subjects (mean age 21.6 yrs, range 18–39 yrs) volunteered for this study. Following treadmill VO2max determination, HR, HRV, minute ventilation (Ve), VO2, respiratory exchange ratio and perceived exertion were recorded during seated rest and consecutive bouts of steady-state exercise at 50% and 65% of maximum HR (HRmax). Exercise was performed using upper body (arm ergometer), lower body (Monark cycle) and whole body (treadmill) modes in a randomised order. Analysis by 2-way repeated measures ANOVA (p<0.05) demonstrated that all variables were similar between modes at rest, with moderate exercise resulting in a significantly increased HR, Ve, VO2, RER and decreased HRV measures. Despite a significantly lower VO2 and greater RPE for upper body exercise, all HRV measures were similar regardless of exercise mode. The current study has demonstrated: that during steadystate exercise at the same relative intensity (HRmax), the neural modulation of HR is similar regardless of exercise mode; that the change in neural modulation of HR between rest and moderate exercise is independent of exercise mode.
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7(4) Supplement
ISBN/ISSN
1440-2440
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Pages Count
1
Location
Alice Springs, Australia
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Elsevier
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DOI
10.1016/S1440-2440(04)80251-2