Cardiopulmonary exercise testing and post-exertional malaise in ME/CFS: A retrospective analysis
Staci R. Stevens, Christopher R. Snell, Jared N. Stevens et al.·Journal of Translational Medicine·2018·n=51
ME/CFS patients underwent two consecutive days of cardiopulmonary exercise testing (CPET). On the second day, patients showed significantly reduced VO2 max and anaerobic threshold compared to the first day — and compared to healthy and disease controls who recovered normally. This objective impairment matches the subjective PEM experience.