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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.