Musical Auditory Stimulation Influences Heart Rate Autonomic Responses to Endodontic Treatment

Table 2

Mean and standard deviation of SBP, DBP, and cortisol in T1 and T4, heart rate (HR), RR interval, and linear indices in T1, T2, T3, and T4 in the volunteers without auditory stimulus.

Variable	T1	T2	T3	T4	Value p
SAP (mmHg)		—	—		0.7033
DAP (mmHg)		—	—		0.3075
Cortisol (ug/dl)		—	—		0.1334
HR (bpm)					0.1851
RR (ms)
SDNN (ms)					0.4717
RMSSD (ms)					0.0251
pNN50 (ms)					0.0620
RRtri (ms)					0.1472
TINN (ms)					0.0626
SD1 (ms)					0.0240
SD2 (ms)					0.6685
LF (ms^2)					0.3427
LF (nu)					0.8741
HF (ms^2)					0.1104
HF (nu)					0.4329
LF/HF					0.8741

< 0,05: versus T3. ms: milliseconds; bpm: beat per minute; mmHg: millimeters of mercury; ug/dl: micrograms per deciliter; nu: standard unit; ms²: absolute unity; SDNN: standard deviation of all normal RR intervals; pNN50: percentage of adjacent RR intervals lasting difference greater than 50 milliseconds; RMSSD: square root of the mean square of differences between adjacent normal RR intervals; LF: low frequency; HF: high frequency; LF/HF: ratio low frequency/high frequency; RRtri, triangular index; TINN, triangular interpolation of RR intervals; SDI: standard deviation of the instantaneous variability of the beat-to-beat heart rate; SD2: standard deviation of long-term continuous RR interval variability; SD1/SD2 ratio: ratio between the short- and long-term variation of the RR intervals.