Abstract
Echocardiography can be used to estimate myocardial contractility by the assessment of the circumferential end-systolic stress-corrected left ventricular (LV) fractional shortening measured at midwall level (stress-corrected MWS). Whether stress-corrected MWS at rest predicts exercise peak oxygen uptake (peak V̇O2) is unknown. Also, it is not known whether the propagation rate of the early LV filling wave (E wave propagation rate, V̇ p), a new pre-load insensitive index of LV diastolic function, and echocardiographically assessed indices of arterial stiffness correlate to peak V̇O2. Accordingly, we performed echocardiographic studies and exercise tests with respiratory gas analysis in 15 young healthy male subjects (mean age 27 years, range 18–36). Neither stress-corrected-MWS (r=0.20, P=NS) nor ejection fraction (r=−0.05, P=NS) correlated significantly with peak V̇O2. Adjustment for age and resting heart rate had no effect on the results. In separate multiple regression models adjusting for standard covariates (age, LV size and heart rate), peak V̇O2 correlated with V̇ p (beta=0.98, P<0.01), as well as with E/A (beta=0.85, P<0.01), and with the isovolumic relaxation time (indicator of LV relaxation) (beta=−0.59, P<0.05). Arterial stiffness indices showed no significant relation to peak V̇O2. We conclude that in young healthy male subjects, resting myocardial contractility and arterial stiffness are not significant correlates of peak V̇O2, whereas LV diastolic function, and in particular V̇ p, influences the variability of peak V̇O2.
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This study was supported in part by the Educational Fund of PhD program “XVI ciclo”, 2002.
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Palmieri, V., Palmieri, E.A., Arezzi, E. et al. Peak exercise oxygen uptake and left ventricular systolic and diastolic function and arterial mechanics in healthy young men. Eur J Appl Physiol 91, 664–668 (2004). https://doi.org/10.1007/s00421-003-0999-8
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DOI: https://doi.org/10.1007/s00421-003-0999-8