Skip to main content

Table 2 Subjective, heart rate and ventilatory parameters obtained during consecutive days of maximal exercise testing

From: Diagnostic sensitivity of 2-day cardiopulmonary exercise testing in Myalgic Encephalomyelitis/Chronic Fatigue Syndrome

Variable

Controls Day 1

ME/CFS Day 1

Controls Day 2

ME/CFS Day 2

‘Group’ effect p-value

‘Time’ effect p-value

‘Group’ × ‘Time’ interaction p-value

Chalder Fatigue Score

11.2 (0.6)

20.3 (6.8)

11.2 (0.6)

25.3 (7.0)

<0.001

0.005

0.005

Resting

 HR (bpm)

69.5 (8.4)

74.0 (12.1)

70.1 (10.9)

72.0 (12.0)

0.47

0.60

0.35

 VO2 (ml/kg/min)

4.1 (0.8)

4.5 (1.4)

4.1 (0.7)

4.1 (1.3)

0.57

0.46

0.49

Steady state (30 W for female, 40 W for male)

 HR (bpm)

100.6 (11.1)

106.5 (12.6)

101.0 (12.7)

104.5 (14.2)

0.31

0.71

0.57

 VO2 (ml/kg/min)

11.6 (1.3)

11.4 (1.3)

11.4 (1.3)

11.3 (2.1)

0.80

0.49

0.83

 RPE

8.3 (1.6)

10.5 (1.9)

7.5 (1.7)

10.4 (2.3)

0.001

0.32

0.40

Ventilatory threshold

 HR (bpm)

122.4 (13.2)

124.0 (18.3)

120.8 (14.2)

117.4 (17.6)

0.89

0.03

0.17

 WR (watts)

90.5 (17.1)

87.8 (29.6)

88.0 (16.7)

72.5 (27.7)

0.37

<0.001

0.003

 VO2 (ml/kg/min)

16.5 (2.0)

15.9 (4.1)

15.9 (1.5)

15.4 (3.4)

0.69

0.08

0.82

 RPE

10.8 (1.9)

13.0 (1.4)

10.7 (1.6)

12.6 (2.0)

0.003

0.41

0.63

Maximal exercise

 HR (bpm)

170.3 (10.0)

167.8 (20.0)

170.9 (11.0)

167.0 (15.7)

0.60

0.93

0.66

 WR (watts)

172.0 (35.5)

154.4 (56.0)

174.0 (36.6)

152.5 (51.7)

0.32

0.97

0.27

 VO2 (ml/kg/min)

29.9 (6.1)

27.3 (9.2)

30.3 (6.2)

27.4 (8.8)

0.40

0.54

0.73

 RPE

16.4 (1.4)

17.5 (1.4)

17.0 (1.6)

17.6 (1.3)

0.11

0.20

0.40

  1. Values are mean (SD), Italic text indicates p-value < 0.05
  2. ME/CFS Myalgic Encephalomyelitis/Chronic Fatigue Syndrome, HR heart rate, VO2 volume of oxygen uptake, ml millilitres, kg kilogram, min minute, RPE rating of perceived exertion, WR work rate