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Table 3 Relation of Fatigue Severity Scale, number of tender points and orthostatic intolerance to dO2Hb and dHHb

From: Submaximal exercise testing with near-infrared spectroscopy in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome patients compared to healthy controls: a case–control study

  FSS Number of tender points Orthostatic intolerance
Spearman’s rho P Spearman’s rho P Yes* No* P
dO2Hb (AU) 0.198 0.5 −0.2293 0.4 −0.4 (−5.0;0.52) 0.6 (−4.2;2.3) 0.9
dHHb (AU) −0.2385 0.4 0.0785 0.8 5.3 (4.3;10.0) 4.2 (2.7;12.4) 0.9
  1. N = 16
  2. P value are Spearman’s rank correlation coefficient for FSS and number of tender points and rank sum for orthostatic intolerance.
  3. FSS Fatigue Severity Scale, dO 2 Hb delta-oxy-hemoglobin, dHHb delta-deoxy-hemoglobin and AU arbitrary unit.
  4. * Median (IQR).