Fig. 1

M-wave, exercise-induced redox stress and CD26-expression. Correlation between the decrease in M-wave amplitude post-exercise (ΔM-wave) and the maximal increase in TBARS level induced by exercise (ΔTBARS) (percent of its resting level; a) Correlation between ΔM-wave and CD26-expression at rest (b). Correlation between ΔTBARS and CD26-expression at rest (c). Data in ME/CFS patients (n = 36) and control healthy subjects (n = 11) are reported. Each point could correspond to different individuals. Least square linear regression with 95 % confidence intervals is shown