Effects of a randomized-controlled and online-supported physical activity intervention on exercise capacity, fatigue and health related quality of life in patients with post-COVID-19 syndrome.

"Declarations Ethics approval and consent to participateThis study was carried out in accordance with the Declaration of Helsinki and is registered at the German Clinical Trials Register (registration number: DRKS0002793). The institutional ethics review board of Hannover Medical School approved the study (No.9822_BO_S_2021) and written informed consent was obtained prior to the inclusion of patients. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This study was supported and funded by Erwin Röver Foundation. Open Access funding enabled and organized by Projekt DEAL."

"Trial registration German Clinical Trials Register (registration trial number: DRKS00026245) on September 2 2021."