Heart-rate variability effects of β-adrenoceptor agonists (xamoterol, prenalterol, and salbutamol) assessed nonlinearly with scatterplots and sequence methods

Summary:Full antagonists of the cardiac β-adrenoceptor improve heart-rate variability (HRV) in humans; however, partial agonism at the β2-adrenoceptor has been suggested to decrease HRV. We therefore studied the HRV effects of some partial agonists of the β1- and β2-adrenoceptors in normal volunteer