CRP and rheumatoid arthritis: Their results indicated circulating post-exercise CRP concentration was higher in RA versus CON group (RA: 14.3 ± 2.1 mg/l; CON: 1.3 ± 1.9 mg/l; p < 0.01); however, there were no significant interactions with either exercise bout or timepoint and no worsening of systemic disease activity post-exercise.