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Table 7 Hierarchically reduced generalized linear models for the outcome measures within the fibromyalgia subgroup (Responses to the stress-relaxation protocol)

From: Muscle activity and acute stress in fibromyalgia

  %EMG EMG rest time Pain Stress  
Predictors Estimates CI p Estimates CI p Estimates CI p Estimates CI p
(Intercept) -0.01 -0.37–0.35 0.969 -0.02 -0.04–0.00 0.126 -1.25 -2.06 – -0.44 0.003 -0.07 -1.25–1.11 0.906
baseline 0.83 0.78–0.88 < 0.001 0.98 0.95–1.01 < 0.001 0.83 0.75–0.90 < 0.001 0.86 0.79–0.93 < 0.001
time [2: stress] 0.34 0.04–0.65 0.029 -0.01 -0.03–0.01 0.254 0.39 -0.10–0.88 0.117 1.98 1.56–2.40 < 0.001
time [3: relaxation] 0.26 -0.05–0.57 0.102 0.04 0.02–0.07 0.001 0.49 0.03–0.95 0.040 0.75 0.34–1.15 < 0.001
time [4: stress] 0.40 0.11–0.68 0.007 -0.01 -0.03–0.02 0.606 0.65 0.16–1.14 0.010 2.02 1.47–2.57 < 0.001
time [5: relaxation] -0.10 -0.41–0.20 0.520 0.04 0.02–0.07 0.001 0.77 0.26–1.28 0.003 0.43 -0.05–0.90 0.079
BMI 0.01 0.00–0.02 0.034        -0.03 -0.06 – -0.01 0.020
Leisure time physical activity -0.15 -0.28 – -0.02 0.023 0.02 0.00–0.03 0.016     -0.46 -0.78 – -0.14 0.005
PSS     -0.00 -0.00 – -0.00 0.035       
FIQ     0.00 0.00–0.00 0.001       
STAI-B        0.04 0.02–0.05 < 0.001 0.02 0.01–0.04 0.008
time [2] * baseline -0.11 -0.21 – -0.01 0.030          
time [3] * baseline -0.23 -0.33 – -0.13 < 0.001          
time [4] * baseline -0.22 -0.31 – -0.13 < 0.001          
time [5] * baseline -0.11 -0.21 – -0.01 0.029          
Observations 255 255 254 254  
  1. %EMG Normalized surface electromyography, EMGrest EMG rest time, BMI Body Mass Index, PSS Perceived Stress Scale, FIQ Fibromyalgia Impact Questionnaire score, STAI-B State-Trait Anxiety Index Trait score