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Diagram of study design. ME/CFS, Myalgic Encephalomyelitis/Chronic Fatigue Syndrome; CPET, cardiopulmonary exercise test; min, minutes; RHR, resting heart rate; HRV, heart rate variability; HR, heart rate; rHRI, maximal rate of heart rate increase; SSHR, steady state heart rate; AUC, area under the curve; HRmax, maximal heart rate; and HRR, heart rate recovery.
