Table 1.
Demographic and baseline data* for ME/CFS patients and controls.
Table 2.
Cardiopulmonary responses at the gas exchange threshold during exercise testing in ME/CFS patients and controls.
Table 3.
CPET variables of ventilatory and heart rate performance during exercise testing in ME/CFS patients and controls.
Table 4.
Cardiopulmonary responses at peak exercise in ME/CFS patients and controls.
Fig 1.
Mean (95% CI) cardiopulmonary exercise testing values for participants with ME/CFS and otherwise healthy controls.
Plots in the left column show values for the full study sample (ME/CFS = 178; Controls = 169) and plots in the right column show values for the fitness-matched subgroup (ME/CFS = 99; Controls = 99). Data are expressed as 20, 40, 60, 80, and 100% of peak oxygen uptake. Significant findings from the linear mixed effects models of the entire exercise response are denoted with *. a. Ventilatory parameters—ventilation (), respiratory frequency (fR), and tidal volume (VT). b. Heart rate parameters—heart rate (HR), oxygen pulse (
), and chronotropic index (CTI). c. Efficiency related parameters—ventilatory equivalent for oxygen (
), ventilatory equivalent for oxygen (
), and oxygen uptake/work rate (
). d. Ratings of perceived exertion (RPE) on the Borg 6–20 scale.