Fig. 4

Quadriceps Strength over consecutive measurements (a) and Max strength (b) Female ME/CFS patients showed lower levels and stronger decrease of QS compared to HC upon repeat pulls (a) resulting in significantly diminished QS after 20 min (Fmax5) only in the patient group (b). a Mean value with standard deviation and b median with interquartile range, paired t-test. Squares: HC, n = 8, p = 0.7318, and circles: ME/CFS patients, n = 8, p = 0.0018