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Table 4 Distribution of the degree of deconditioning according Parsaik and colleagues across ME/CFS hemodynamic groups (normal HR/BP response, POTS, and dOH), all with a significant CBF decrease as measured during HUT

From: Deconditioning does not explain orthostatic intolerance in ME/CFS (myalgic encephalomyelitis/chronic fatigue syndrome)

Degree deconditioning*

NormHRBP (n = 105)(%)

POTS (n = 39) (%)

dOH (n = 27) (%)

Total

No deconditioning: %peak VO2 ≥ 85% (n =)

27 (26%)

4 (11%)

7 (26%)

38

Mild deconditioning %peak VO2 65–85% (n =)

33 (31%)

13 (33%)

7 (26%)

53

Severe deconditioning: %peak VO2 < 65%(n =)

45 (43%)

22 (56%)

13 (48%)

80

Total

105

39

27

171

  1. Chi square statistics = 5.41(p = 0.25)(3 × 3 table)
  2. dOH delayed orthostatic hypotension during HUT, NormHRBP normal heart rate and blood pressure response during HUT, POTS postural orthostatic tachycardia syndrome during HUT, %peak VO2 oxygen consumption as percentage of normal values of a population study [19]
  3. * Subgrouping of the degree of deconditioning according to Parsaik et al. [6]