Skip to main content

Table 3 Change from Test 1 to Test 2 in functional impairment classification using VO 2 peak and ventilatory threshold criteria[34]

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

VO2peak(ml.kg-1.min-1) Number of classes decreased (# participants)
A (>20) -1 class (N = 5)*  
B (16–20) -1 (2) -2 (1)
C (10–15)   
D (<10)   
Ventilatory threshold (ml . kg -1. min -1 )   
A (>14) -1 (2) -2 (2)
B (12–14) -1 (3) -2 (1)
C (9–10) -1 (4)  
D (6–7)   
Number of participants whose impairment classification decreased on Test 2 based on criteria of VO2peak, VT, or both VO2peak and VT
VO 2 peak only VT only VO 2 peak & VT
4 7 5
  1. * For 5 participants, impairment classification based on Test 1 VO2peak decreased from “A” to “B” using Test 2 VO2peak.
  2. A – Little-no impairment.
  3. B – Mild-moderate impairment.
  4. C – Moderate-severe impairment.
  5. D – Severe impairment.