Table 2.

Correlations Between Heart Rate Variability Parameters and Physiological and Psychological Data

HRV parameters	Controls (n = 31)		IBS (n = 156)
	%HF	LF/HF	%HF	LF/HF
Motility index (MI)
Baseline	−0.208	0.145	−0.098	0.102
Distention	0.266	−0.250	0.013	−0.016
Postprandial	0.003	0.067	−0.231a	0.229a
Pain threshold	0.046	−0.034	0.003	0.004
Urge threshold	−0.329	0.231	−0.031	0.059
IBS-SSS	−0.109	0.015	0.018	−0.011
IBS-QOL	0.287	−0.291	0.106	−0.107
BSI-18
General	−0.069	0.047	−0.199b	0.206b
Somatization	−0.063	0.059	−0.062	0.067
Depression	−0.251	0.258	−0.178b	0.182b
Anxiety	0.020	−0.084	−0.125	0.133

^aP < 0.01.

^bP < 0.05.

HRV, heart rate variability; HF, high frequency; LF, low frequency; IBS-SSS, Irritable Bowel Syndrome Symptom Severity Scale; IBS-QOL, Irritable Bowel Syndrome Quality of Life; BSI, Brief Symptom Inventory.

Data are shown as rho scores by the Spearman rank correlation coefficient. Baseline data for %HF or LF/HF were used to assess the correlations except motility index during distention and postprandial periods.