Previous exposure to musical auditory stimulation immediately influences the cardiac autonomic responses to the postural change maneuver in women

Table 2 Mean and standard deviation for time-domain indices between before, 0–5 minutes, 5–10 minutes and 10–15 minutes after the postural change maneuver in the control protocol

Index	Seated rest	0-5 min	5-10 min	10-15 min	p
SDNN (ms)	45.1±9	44.6±13	44.6±13	*34.7±8	0.040
RMSSD (ms)	30.4±12	19.2±7	17.7±7	*16.9±7	0.030
pNN50 (%)	11.4±14	3.2±4	2.7±3	*2±3	0.0189

*Different from Control. N=12.
Legend: SDNN standard deviation of normal-to-normal R-R intervals, pNN50 the percentage of adjacent RR intervals with a difference of duration greater than 50 ms, RMSSD root-mean square of differences between adjacent normal RR intervals in a time interval. ms millisecond.