Table 5

Significant correlations with r absolute value ≥ 0.05 between symptom scales and HRV parameters evaluated during sleeping hours (0000 to 0600 hours).

Fibromyalgia

(n = 22)

Control

(n = 22)


r

P value

r

P value


FIQ total score

SDNN

0.69

< 0.001

SDANN

0.60

0.003

FIQ VAS pain

SDSD

-0.65

0.001

RMSSD

-0.65

0.001

pNN50

-0.62

0.002

FIQ VAS fatigue

SDNN

0.65

0.001

SDANN

0.57

0.005

FIQ VAS anxiety

SDNN

0.62

0.002

SDANN

0.53

0.011

FIQ VAS depression

SDNN

0.52

0.012

SDANN

0.51

0.015

COMPASS constipation

SDNN

-0.53

0.010

HADS depression

Mean NN

-0.53

0.010

SF-36 mental component

SDSD

0.64

0.001

RMSSD

pNN50

0.64

0.64

0.001

0.001


COMPASS, composite autonomic symptom scale; HADS, hospital anxiety and depression scale; FIQ, fibromyalgia impact questionnaire; Mean NN, mean NN interval; pNN50, percentage of adjacent pairs of R-R intervals that differ by more than 50 ms from each other in a given time period; RMSSD, square root of the mean of the squares of differences between adjacent NN intervals; SDANN, mean standard deviation of the average NN intervals calculated over 5 minutes; SDNN, standard deviation of the NN intervals; SDSD, standard deviation of the successive NN differences; SF-36, health survey short format 36 items; VAS, visual analogue scale.

Lerma et al. Arthritis Research & Therapy 2011 13:R185   doi:10.1186/ar3513

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