Selected correlates of endurance time.Group mean values for i) peak workrate (Wpeak) and peak oxygen consumption (peak) during incremental exercise (panel A); ii) quadriceps strength assessed during magnetic stimulation of the femoral nerve (Twq) and maximal voluntary contraction (MVC) (panel B) and iii) symptom scores at the end of constant-workrate cycling exercise test (CET) (panel C) in group 1 (Tend<4 min, black bars), group 2 (Tend = 4–6 min, bright grey bars) and group 3 (Tend>6 min, dark grey bars) patients. * p≤0.02 versus group 2; † p≤0.01 versus group 3.
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