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Table 9 Correlations of the scores in psychological questionnaires with psychophysiological measures within the control group (Relations between the psychological and psychophysiological measures)

From: Muscle activity and acute stress in fibromyalgia

  STAI-A STAI-B PSS Pain Stress %EMG EMG Rest
STAI-B 0.61**       
PSS 0.55** 0.76**      
Pain 0.12 0.24 0.12     
Stress 0.01 -0.04 0.06 -0.07    
%EMG 0.14 0.19 0.26 -0.09 0.19   
EMG Rest -0.34 -0.31 -0.24 0.13 -0.25 -0.55**  
  1. STAI-A State-Trait Anxiety Index State score, STAI-B State-Trait Anxiety Index Trait-score, PSS Perceived Stress Scale score, Pain mean reported pain intensity across the protocol, Stress mean reported stress intensity across the protocol, %EMG mean normalized sEMG across the protocol. * = significant at p < 0.05 level; ** significant at p < 0.001. level