There is a lack of randomized clinical trials (RCTs) exploring the outcomes of cardiopulmonary rehabilitation programmes (CPRPs) on submaximal aerobic capacity of long COVID-19 patients (LC19Ps). This RCT aimed to evaluate the effect of an ambulatory CPRP on the 6-min walk test (6MWT) data (main outcome: 6-min walk distance (6MWD)) of LC19Ps. Conducted as a single-blinded RCT, the study included Tunisian LC19Ps with persistent dyspnoea (ie modified medical research council (mMRC) level >= 2) at least three months postdiagnosis. LC19Ps were randomly assigned to the intervention (IG, n = 20) or control (CG, n = 10) groups. Pre- and post-CPRP evaluations included dyspnoea assessments (Borg and mMRC scales), anthropometric data, spirometry, and 6MWT. The CPRP (ie, 18 sessions over six weeks) encompassed warm-up, aerobic training, resistance training, respiratory exercises, and therapeutic education. The CPRP significantly improved i) dyspnoea, ie, IG exhibited larger reductions compared to the CG in Borg (-3.5 +/- 2.0 versus -1.3 +/- 1.5) and mMRC (-1.5 +/- 0.8 versus -0.1 +/- 0.3) scales, and ii) 6MWD, ie IG demonstrated larger improvements compared to the CG in 6MWD (m, %) (168 +/- 99 versus 5 +/- 45 m, 28 +/- 8 versus 1 +/- 8%, respectively), and resting heart rate (bpm, % maximal predicted heart rate) (-9 +/- 9 versus 1 +/- 7 bpm; -5 +/- 6 versus 0 +/- 4%, respectively), with small effect sizes. In the IG, the 1.5-point decrease in mMRC and the 168 m increase in 6MWD exceeded the recommended minimal clinical important differences of 1 point and 30 m, respectively. CPRP appears to be effective in enhancing the submaximal exercise capacity of LC19Ps, particularly in improving 6MWD, dyspnoea, and resting heart rate.

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