Within-group comparisons indicated statistically significant differences between baseline and post-AP pressure HR ( -@ bpm ; @ % confidence interval : -@ , -@ ) and between baseline and post-AP pressure systolic BP ( -@ mmHg ; @ % confidence interval : -@ , -@ ) in the AP group , and between baseline and postplacebo systolic BP ( -@ mmHg ; @ % confidence interval : -@ , -@ ) in the placebo group .