Skip to main content

Advertisement

Table 5 Significant correlations with r absolute value ≥ 0.05 between symptom scales and HRV parameters evaluated during sleeping hours (0000 to 0600 hours).

From: Nocturnal heart rate variability parameters as potential fibromyalgia biomarker: correlation with symptoms severity

  Fibromyalgia (n = 22) Control (n = 22)
   r P value   r sP 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    
  1. 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.