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1 UKK Institute for Health Promotion Research, and 2 Department of Clinical Physiology, Tampere University Hospital, 33500 Tampere; and 3 Department of Cardiology, Oulu University Hospital, 90220 Oulu, Finland
Endurance-trained
athletes have increased heart rate variability (HRV), but it is not
known whether exercise training improves the HRV and baroreflex
sensitivity (BRS) in sedentary persons. We compared the effects of low-
and high-intensity endurance training on resting heart rate, HRV, and
BRS. The maximal oxygen uptake and endurance time increased
significantly in the high-intensity group compared with the control
group. Heart rate did not change significantly in the low-intensity
group but decreased significantly in the high-intensity group (
6
beats/min, 95% confidence interval; 10 to 1 beats/min, exercise
vs. control). No significant changes occurred in either the time or
frequency domain measures of HRV or BRS in either of the exercise
groups. Exercise training was not able to modify the cardiac vagal
outflow in sedentary, middle-aged persons.
endurance training
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