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Table 2 Results of exercise test by participant

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

 

CFS cases (N = 16)

Healthy controls (N = 16)

P value case vs. control

Test length (s)

177.1 (176.1;177.5)

176.3 (175.9;177.4)

0.60

TTI (Newton-seconds)

11,388 (8,463;13,934)

15,382 (12,921;16,974)

0.008

Borg at rest*

1.5 (1;2)

0 (0;0)

<0.0005

Borg at end*,**

3 (3;4)

2.5 (1.5;3)

0.01

dHHb (AU)

4.3 (3.4;10.4)

15.3 (9.1;24.2)

0.008

dHHb/dtHb (AU)

0.8 (0.6;1.5)

1.9 (1.2;3.3)

0.04

dHHb/TTI (AU/Newton-seconds)

0.0004 (0.002;0.001)

0.0009 (0.0006;0.002)

0.06

dO2Hb (AU)

0.2 (−4.2;1.4)

−6.7 (−12.9;−3.6)

0.004

dO2Hb/dtHb (AU)

0.2 (−0.5;0.4)

−0.9 (−2.3;−0.2)

0.04

dO2Hb/TTI (AU/Newton-seconds)

0.00002 (−0.0005;0.0001)

−0.0005 (−0.001;−0.003)

0.02

dtHb (AU)

5.2 (2.1;6.9)

9.8 (0.8;13.6)

0.31

dtHb/TTI (AU/Newton-seconds)

0.0005 (0.0002;0.0008)

0.0006 (0.00006;0.0009)

1.000

  1. Results are N (%) for discrete variables or Median (IQR) for continuous and ordinal variables. dO 2 Hb Delta-oxy-hemoglobin, dHHb delta-deoxy-hemoglobin, dtHb delta-total hemoglobin, AU arbitrary unit and TTI tension-time index.
  2. P values are univariate exact test for discrete variables and rank sum for continuous and ordinal variables. Significant P values are indicated in italics. Confidence intervals not provided due to non-parametric analyses.
  3. * Ordinal variable
  4. ** One CFS case did not report Borg at 3 min due to lightheadedness and the need to quickly lie supine.
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Journal of Translational Medicine

ISSN: 1479-5876

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