ObjectiveTo assess the impact of the closure of group-based cardiac rehabilitation training during the first COVID-19 lockdown in spring 2020 on patients’ physical activity, cardiorespiratory fitness, and cardiovascular risk, and to describe the patient experience of lockdown and home-based exercise training during lockdown.DesignMixed methods study. Prospectively collected post-lockdown measurements were compared to pre-lockdown medical record data. Quantitative measurements were supplemented with qualitative interviews about the patient experience during lockdown.SettingOutpatient CR centre in Salzburg, Austria.ParticipantsTwenty-seven patients [six female, mean age 69 years] (...) who attended weekly CR training sessions until the first COVID-19 lockdown in March 2020.Outcome MeasureQuantitative: exercise capacity, cardiovascular risk. Qualitative: individual semi-structured interviews.ResultsExercise capacity had significantly reduced from pre- to post-lockdown: mean power in maximal ergometry 165 vs. 151, p < 0.001; submaximal ergometer training 99 vs. 97, p = 0.038. There was no significant difference in Framingham risk score and other cardiovascular risk factors. Qualitative data showed that almost all patients had kept physically active during lockdown, but 17 said they had been unable to maintain their exercise levels, and 15 felt their cardiorespiratory fitness had deteriorated. Many patients missed the weekly CR training and the motivation and sense of community from training together with others. Several patients stated that without professional supervision they had felt less confident to carry out home-based exercise training at high intensity.ConclusionThis study highlights the importance of group-based supervised exercise training for patients who engage well in such a setting, and the detrimental impact of disruption to this type of CR service on physical activity levels and exercise capacity. Additionally, learning from the COVID-19 pandemic may inform the development and implementation of remote CR modalities going forward. (shrink)