Cardiac fatigue after prolonged exercise.
- 1 December 1987
- journal article
- research article
- Published by Wolters Kluwer Health in Circulation
- Vol. 76 (6), 1206-1213
- https://doi.org/10.1161/01.cir.76.6.1206
Abstract
To determine the effects of prolonged exercise on systolic and diastolic left ventricular function, we studied 21 athletes before, at the finish (within 11 +/- 5 min), and during recovery (28 +/- 9 hr) after the Hawaii Ironman Triathlon (2.4 mile swim, 112 mile bike, 26.2 mile run). Two-dimensionally guided M mode echocardiograms were digitized for wall thickness, cavity dimension, fractional shortening, and peak rates of cavity enlargement and wall thinning. Pulsed Doppler left ventricular inflow recordings were analyzed for peak early and late velocities and their ratio. Left ventricular diastolic dimension was reduced at race finish (5.4 +/- 0.6 to 5.1 +/- 0.6 cm) and remained reduced after 1 day of recovery (5.2 +/- 0.6 cm, p less than .05). Fractional shortening fell at race finish (39 +/- 5% to 35 +/- 5%), although systolic blood pressure was unchanged, and rose to 40 +/- 4% after recovery (p less than .05). The return to prerace shortening values after recovery occurred despite continued reduction in diastolic size. Peak circumferential shortening did not change significantly. Individual reductions in fractional shortening were correlated with increases in systolic cavity size (r = -.64, p less than .01), but not with decreases in diastolic size. The stress-shortening relationship was displaced downward at race finish, but returned toward baseline after 1 day of recovery, despite a persistent reduction in cavity size. This suggests that the decrease in shortening was due to impaired contractility as well as altered preload.(ABSTRACT TRUNCATED AT 250 WORDS)This publication has 23 references indexed in Scilit:
- 496Medicine & Science in Sports & Exercise, 1987
- Echocardiographic assessment of left ventricular performance before and after marathon runningAmerican Heart Journal, 1986
- Doppler evaluation of left ventricular diastolic filling in children with systemic hypertensionThe American Journal of Cardiology, 1985
- Augmentation of atrial contribution to left ventricular inflow with aging as assessed by intracardiac doppler flowmetryThe American Journal of Cardiology, 1984
- Left ventricular end-systolic stress-shortening and stress-length relations in humansThe American Journal of Cardiology, 1982
- Computerized M-mode echocardiographic analysis of left ventricular dysfunction in cardiac amyloid.Circulation, 1982
- Effect of brief and prolonged exercise on left ventricular functionThe American Journal of Cardiology, 1980
- Echocardiographic assessment of left ventricular filling after mitral valve surgery.Heart, 1977
- Effects of changes in preload, afterload and inotropic state on ejection and isovolumic phase measures of contractility in the conscious dogThe American Journal of Cardiology, 1975
- Comparison of angiocardiographic and thermal washout technics for left ventricular volume measurementThe American Journal of Cardiology, 1966