“…The rationale for activity pacing can be found in several strategies observed in people with CFS: reduced activity levels resulting from and in anticipation of fatigue (Nijs et al, 2011;Vercoulen et al, 1997), lowered activity peaks followed by very long rest periods (van der Werf, Prins, Vercoulen, van der Meer, & Bleijenberg, 2000), and ability to perform short periods of light to moderate activity without exacerbating symptoms (Clapp et al, 1999;Cook et al, 2005). Several randomized controlled trials (RCTs) have shown positive effects of treatment programs based on activity pacing for people with CFS (Cox, 2002;Crawley et al, 2013;Goudsmit et al, 2012;Jason et al, 2013;Pemberton & Cox, 2014;Taylor, 2004). The findings of these studies are in line with those of a pilot study in which several of the current authors participated (Nijs et al, 2009).…”