Association between pulmonary oxygen uptake on-kinetics and acute cardiovascular responses to resistance exercise in patients with coronary artery disease: a preliminary study.
Yusuke Kubo, Daisuke Fujita, Naoya Matsumoto and 2 others
PMID 34393372WHAT IT FOUND
In 7 low-risk heart disease patients, slower oxygen uptake kinetics predicted larger blood pressure spikes during light leg exercises.
This metric worked better than standard fitness or heart function tests. The study is too small to change practice, but suggests oxygen kinetics may help gauge exercise safety.
Key findings
01The time constant for pulmonary oxygen uptake (τVO2p) was significantly associated with the increase in systolic blood pressure (r=0.80) and rate pressure product (r=0.76) during a single session of low-intensity resistance exercise.
02Standard measures of exercise tolerance (ventilatory anaerobic threshold) and cardiac function (left ventricular ejection fraction) were not significantly associated with acute cardiovascular responses to resistance exercise.
03τVO2p was not associated with the increase in heart rate during resistance exercise, possibly due to autonomic dysfunction or beta-blocker use in the participants.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
Extremely small sample size (n=7), limiting statistical power and generalizability. Participants were restricted to low-risk coronary artery disease patients with preserved ejection fraction, so findings may not apply to higher-risk populations. The study only examined low-intensity resistance exercise (30% MVC), so results cannot be extrapolated to moderate or high-intensity training. Potential mediators such as autonomic nerve activity and muscle metabolites were not measured. The lack of association with heart rate may be confounded by beta-blocker medication use in some participants.
Declared interests
None declared.
The easy way to misread this
Do not implement τVO2p testing for resistance exercise prescription based on this paper. With only 7 participants and a focus on low-risk patients doing low-intensity work, the findings are preliminary and do not establish clinical utility or safety thresholds.