Submaximal, Low-Dose Eccentric vs Traditional Cycling Exercise: Reduced Oxygen Uptake and Pulmonary Artery Pressure Assessed by Echocardiography in Healthy Middle-aged Adults. A Randomized Controlled, Crossover Trial.
Julian Müller, Meret Bauer, Simon R Schneider and 9 others
PMID 39006112WHAT IT FOUND
Eccentric cycling lowered oxygen uptake by 40% and pulmonary artery pressure by 26% compared to traditional cycling in healthy adults.
Participants felt less breathless but reported similar leg fatigue, suggesting a lower cardiopulmonary load at the same external work.
Key findings
01Oxygen uptake was significantly lower during eccentric cycling compared to traditional cycling.
02Pulmonary artery pressure, assessed by tricuspid regurgitation pressure gradient, was lower during eccentric cycling.
03Perceived breathlessness was reduced during eccentric cycling, while leg fatigue remained unchanged.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study was conducted on healthy participants, so the findings may not directly apply to patients with cardiopulmonary disease. Maximum exercise capacity was not measured, so the submaximal intensities were estimated based on self-reported fitness. The body position differed between the two tests (upright for traditional, Fowler's for eccentric), which may have influenced hemodynamic responses. One participant discontinued the eccentric test due to knee pain, highlighting a potential risk of musculoskeletal strain.
Declared interests
No conflicts of interest or specific funding sources were explicitly declared in the provided text.
The easy way to misread this
Do not assume eccentric cycling is safe or effective for patients with cardiopulmonary disease based on this trial alone. The study was conducted in healthy adults, and one participant dropped out due to knee pain. The lower physiological strain does not guarantee safety in clinical populations, and the lack of familiarization for eccentric movement can lead to muscle damage.