title: Peak exercise oxygen uptake and left ventricular systolic and diastolic function and arterial mechanics in healthy young men.
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 VO(2)) is unknown. Also, it is not known whether the propagation rate of the early LV filling wave (E wave propagation rate, V(p)), a new pre-load insensitive index of LV diastolic function, and echocardiographically assessed indices of arterial stiffness correlate to peak VO(2). 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 VO(2). 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 VO(2) correlated with V(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 VO(2). We conclude that in young healthy male subjects, resting myocardial contractility and arterial stiffness are not significant correlates of peak VO(2), whereas LV diastolic function, and in particular V(p), influences the variability of peak VO(2).
authors.affiliation: Department of Clinical and Experimental Medicine, Federico II University of Naples, via Pansini 5, Edificio 1/A, 80131 Naples, Italy. vpalmier@med.cornell.ed
authors.forename: Vittorio
authors.initials: V
authors.lastname: Palmieri
authors.forename: Emiliano Antonio
authors.initials: EA
authors.lastname: Palmieri
authors.forename: Emma
authors.initials: E
authors.lastname: Arezzi
authors.forename: Pasquale
authors.initials: P
authors.lastname: Innelli
authors.forename: Maria
authors.initials: M
authors.lastname: Sabatella
authors.forename: Liberato Aldo
authors.initials: LA
authors.lastname: Ferrara
authors.forename: Serafino
authors.initials: S
authors.lastname: Fazio
authors.forename: Aldo
authors.initials: A
authors.lastname: Celentano
mesh_terms: D000293:Adolescent; D000328:Adult; D001011:Aorta / Q000000981:diagnostic imaging* / Q000502:physiology; D003971:Diastole / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D006352:Heart Ventricles / Q000000981:diagnostic imaging; D006801:Humans; D008297:Male; D009200:Myocardial Contraction / Q000502:physiology*; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D013223:Statistics as Topic; D013599:Systole / Q000502:physiology; D014463:Ultrasonography; D016276:Ventricular Function; D016277:Ventricular Function, Left / Q000502:physiology*