Key result
Orthostatic stress is linked to HRV patterns showing increased sympathetic and reduced parasympathetic activity.
Coarse graining spectral analysis of heart rate variability provides a novel method to simultaneously assess autonomic tone and cardiovascular system complexity during orthostatic stress.
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Supports HRV assessment of orthostatic autonomic shifts; leaves open whether fractal dimension improves risk stratification or management.
Butler et al. (1994) conducted a review in Orthostatic stress and cardiovascular deconditioning. Orthostatic stress was evaluated on Heart rate variability patterns (parasympathetic and sympathetic indicators, and fractal dimension). Orthostatic stress is associated with patterns of heart rate variability indicating reduced parasympathetic activity, increased sympathetic activity, and reduced fractal dimension.
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