Key result
High levels of physical activity in older women decreased parasympathetic modulations of heart rate during incremental submaximal exercise (p <.01) compared with less active groups.
Why the study?
Does the level of physical activity affect heart rate variability at rest and during exercise in older women?
Cross-Sectional
Does the level of physical activity affect heart rate variability at rest and during exercise in older women?
p-value: p=<.01
A high level of physical training in older women induces a higher sensitivity of sinus node response to the autonomic nervous system during exercise.
May alter HRV interpretation during exercise testing in active older women; leaves open clinical relevance pending longitudinal studies.
The purpose of this study was to determine the effect of the level of physical activity in older women on heart rate (HR) response to its neural control at rest and during exercise by using heart rate variability (HRV) analysis. Electrocardiogram (ECG) was recorded in 3 (low, moderately, and highly) active groups of older women at rest and during submaximal exercise. Spectral HRV indexes were obtained from the ECG signal. At rest, highly active subjects have low HR without any alteration of HRV. During incremental submaximal exercise, parasympathetic modulations of HR decreased only in the highly active subjects (p <.01) without any alteration of HR, compared with the other groups. In older women, the effects of the level of physical activity on HR and HRV are dissociated. Quite a high level of physical training induces a higher sensitivity of sinus node response to the autonomic nervous system during exercise.
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Reland et al. (2003) reported a cross-sectional. High level of physical activity vs. Low and moderately active levels was evaluated on Heart rate (HR) and heart rate variability (HRV) response at rest and during exercise (p=<.01). High levels of physical activity in older women decreased parasympathetic modulations of heart rate during incremental submaximal exercise (p <.01) compared with less active groups.
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