Standing posture increased the short-term scaling exponent in all subjects and decreased sample entropy in healthy and less severely ill patients compared to supine rest.
Observational
Does standing posture alter nonlinear measures of heart period variability in children and young adults with heart disease compared to healthy controls?
Changes in nonlinear measures of heart period variability upon standing are blunted in patients with severe heart disease compared to healthy controls, likely reflecting altered vagal activity.
Nonlinear measures of heart period variability (HPV) were determined in supine rest and standing posture in children and young adults with heart disease and compared to the control. The aim was to study influence of posture and heart disease on heart period dynamics. It was found that standing increases short-term scaling exponent in all subjects and decreases sample entropy in healthy and less severely ill patients. Severely ill patients compared to control have higher short-term scaling exponent in supine. Changes in nonlinear measures of HPV upon standing are more pronounced in healthy than diseased subjects due to different vagal activity.
Vuksanović et al. (Wed,) conducted a observational in Heart disease. Standing posture vs. Supine rest was evaluated on Nonlinear measures of heart period variability (short-term scaling exponent and sample entropy). Standing posture increased the short-term scaling exponent in all subjects and decreased sample entropy in healthy and less severely ill patients compared to supine rest.