Key result
Seismocardiography reliably estimates VO2max compared to CPET with strong ~0.87 correlation in healthy adults.
Why the study?
Measurement of cardiorespiratory fitness via CPX testing is complex and costly, motivating development of a non-exercise estimation method using seismocardiography.
Does seismocardiography accurately estimate maximal oxygen consumption compared to cardiopulmonary exercise testing in healthy subjects?
Observational (n=295)
Yes
Does seismocardiography accurately estimate maximal oxygen consumption compared to cardiopulmonary exercise testing in healthy subjects?
Seismocardiography provides an accurate and reproducible non-exercise estimation of V̇O2max, offering a simpler and less costly alternative to cardiopulmonary exercise testing for assessing cardiorespiratory fitness.
Answers are grounded in this paper and cite their sources.
May support non-exercise VO2max estimation in healthy adults; leaves open validation in clinical populations.
Cardiorespiratory fitness expressed as maximal oxygen consumption (V̇O2max) is a strong predictor of cardiovascular health, but its measurement through cardiopulmonary exercise (CPX) testing is complex and costly. This study develops and validates an algorithm for non-exercise estimation of V̇O2max using seismocardiography (SCG-V̇O2max). Data from SCG recordings and CPX tests of 300 subjects were combined into a database, with 83 subjects undergoing repeated sessions. SCG was recorded via a sensitive accelerometer on the lower sternum in a supine position. A machine learning algorithm was trained on data from 221 subjects, with 74 subjects comprising a test set. SCG- V̇O2max (44.8 ± 9.4 ml/min/kg) was comparable to CPX V̇O2max (44.0 ± 10.2 ml/min/kg), with a correlation of r = 0.873. Day-to-day variation was low for both methods. SCG-based estimation of V̇O2max is a novel, easy-to-use, and accurate method for assessing cardiorespiratory fitness, with high reproducibility and potential for integration into health evaluations.
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Schmidt et al. (2025) conducted an observational in Healthy (n=295). Seismocardiography (SCG-VO2max) vs. Cardiopulmonary exercise (CPX) testing was evaluated on Estimation of VO2max (ml/min/kg) (r = 0.873, 95% CI 0.83-0.91, p=0.07). Seismocardiography-based estimation of VO2max was comparable to cardiopulmonary exercise testing with a high correlation of r = 0.873 in healthy adults.