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Am J Physiol Heart Circ Physiol. 2008 Mar;294(3):H1174-82. Epub 2007 Dec 27.

The effects of caloric restriction- and exercise-induced weight loss on left ventricular diastolic function.

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  • 1Cardiovascular Biophysics Laboratory, Cardiovascular Division, Department of Internal Medicine, Washington University School of Medicine, St. Louis, MO 63110, USA.

Abstract

Little is known about the effects of weight loss on diastolic function. Furthermore, it is not known whether both caloric restriction (CR)- and exercise (Ex)-induced weight loss have salutary effects on diastolic function. Therefore, we assessed the effects of yearlong CR (n = 12) and Ex (n = 13) interventions, which induced approximately 12% weight loss, on diastolic function in healthy, nonobese (body mass index = 23.5-29.9 kg/m2) men and women aged 50 to 60 yr. Recordings of Doppler transmitral flow and Doppler tissue imaging were acquired and analyzed by conventional approaches and a validated parameterized diastolic filling (PDF) formalism. Isovolumic relaxation time decreased after weight loss in both groups (P < 0.05). Septal peak early mitral annular velocity (E') increased (P < 0.01) and peak E-wave velocity/E' decreased (P < 0.05) after weight loss in the CR group. Based on the PDF-derived indexes, CR resulted in a decrease in global ventricular stiffness (k) and increases in longitudinal (septal annulus motion) stored elastic strain (chi'o), peak force (k'chi'o), and peak stored strain energy (1/2k'chi'o2). In the Ex group, k was unchanged, although septal chi'o and 1/2k'chi'o2 increased significantly and k'chi'o (P = 0.13) tended to increase. We conclude that weight loss, whether induced by CR or Ex, has salutary effects on diastolic function.

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