Skip to main content

Table 2 Physiological and work variables for Tests 1 and 2 at peak and ventilatory threshold (VT) intensities, N = 22 (mean ± SD)

From: Inability of myalgic encephalomyelitis/chronic fatigue syndrome patients to reproduce VO2peak indicates functional impairment

Peak exercise

Test 1

Test 2

%diff*

P

VO2peak (ml.kg-1.min-1)

21.9 (4.75)

18.6 (4.06)

-13.8%

.000¶

%predVO2peak‡

77.1% (20.22)

65.2% (15.74)

---

.000¶

HRpeak (bpm)

159.4 (21.10)

150.0 (23.05)

-5.9%

.001¶

%predHRpeak†

91.0% (10.75)

85.2% (11.93)

---

.002¶

Work@peak (W)

122.7 (28.77)

105.7 (33.57)

-12.5%

.012||

Ve peak (L .min-1)

54.5 (17.56)

44.6 (12.63)

-14.7%

.003¶

VCO2peak (L .min-1)

1.91 (.477)

1.58 (.464)

-16.1%

.000¶

O2 pulse@peak (ml.beat-1)

10.48 (3.068)

9.46 (2.697)

-8.8%

.003¶

%predVO2peak‡

77.1% (20.22)

65.2% (15.74)

---

.000¶

RERpeak

1.17 (0.079)

1.14 (0.081)

-1.9%

.157

Ventilatory threshold

    

VO2@VT (ml.kg-1.min-1)

12.2 (3.68)

9.9 (2.89)

-15.8%

.003¶

HR@VT (bpm)

113.5 (21.78)

107.9 (20.61)

-4.9%

.086

Work@VT (W)

51.4 (24.97)

41.4 (28.8)

-21.3%

.030||

Ve@VT (L.min-1)

21.2 (6.07)

18.8 (4.86)

-7.4%

.035||

VCO2@VT (L.min-1)

0.86 (.343)

0.72 (.265)

-11.3%

.014||

O2 pulse@VT (ml.beat-1)

8.15 (2.603)

7.00 (2.323)

-12.6%

.003¶

  1. *A negative %diff value indicates a decrease from Test 1 to Test 2.
  2. †Percent of age-predicted maximum heart rate achieved.
  3. ‡% predicted VO2peak for sedentary subjects from Bruce et al. [23].
  4. ||Statistically significant difference between Test 1 and Test 2 at P < 0.05.
  5. ¶Statistically significant difference between Test 1 and Test 2 at P < 0.01.