Cardiac rehab gains held at every BMI

Exercise-based cardiac rehabilitation is a guideline-recommended part of secondary prevention after cardiovascular disease, yet uptake and expectations vary, and one persistent question is whether body size changes who benefits. Patients with a higher BMI are sometimes assumed to respond less well to structured exercise, which risks them being offered it less enthusiastically. There is also the matter of what rehabilitation actually shifts: objectively measured exercise capacity, subjective wellbeing, or both. This study set out to document changes in both domains across BMI categories in a routine hospital programme.

Seventy-nine patients with cardiovascular disease took part in a structured cardiac rehabilitation programme consisting of 12 in-centre sessions delivered two to three times per week. Assessments were carried out before and after the programme. Exercise capacity was measured with a cardiopulmonary exercise test, capturing oxygen uptake, ventilation and workload at the anaerobic threshold as well as the oxygen uptake efficiency slope. Psychological and quality-of-life outcomes were captured with four questionnaires covering quality of life, depression and anxiety. Participants were grouped by BMI so that responses could be compared across body-size categories.

Oxygen uptake at the anaerobic threshold rose from 10.9 ± 2.9 to 13.3 ± 3.4 mL/min/kg, ventilation from 29.3 ± 7.5 to 35.6 ± 9.3 mL/min/kg, and workload from 56.7 ± 25.4 to 70.0 ± 27.7 W, all statistically significant. The oxygen uptake efficiency slope also improved, from 1,426.8 ± 346.3 to 1,547.2 ± 403.5. Alongside these physiological gains, participants reported significant improvements in quality of life and reductions in depression and anxiety levels after rehabilitation. The authors report that these positive outcomes were consistent across the study groups, meaning the pattern of improvement did not differ meaningfully by BMI category.

The results are consistent with a large existing evidence base showing that supervised exercise improves functional capacity after cardiovascular disease, and they add a specific reassurance that higher body weight did not blunt the response in this cohort. The simultaneous movement in objective exercise measures and in mood and quality-of-life scores fits the broader picture of rehabilitation as more than a cardiorespiratory intervention. What the design cannot do is isolate the effect of the exercise itself: with no control group, part of the improvement could reflect spontaneous recovery after a cardiac event, greater familiarity with the exercise test, or the attention that comes with a supervised programme. Whether the gains persist after the 12 sessions end is not addressed.

This is a reason to think that a short course of supervised cardiac rehabilitation is worth engaging with whatever your body size, and that its returns are measured in both what you can do and how you feel. The size of the change in oxygen uptake at the anaerobic threshold is the kind of shift that tends to translate into everyday activities feeling less punishing. Reductions in reported depression and anxiety alongside it suggest the psychological side is not incidental. As an uncontrolled study in a clinical population, it describes what happened to these patients rather than proving the programme caused every bit of it.