The effect of extremely exhaustive exercise on left ventricular performance was studied echocardiographically in 13 experienced male ultramarathon runners who took part in a competitive 24 hr run, completing distances of 114 to 227 km. Although the left ventricular end-diastolic dimension (EDD) was reduced by 7% (54 ± 5 to 50 ± 7 mm; p < .005), the end-systolic dimension (ESD) increased slightly (33 ± 5 to 34 ± 6 mm; NS). As a consequence, the stroke dimension (21 ± 2 to 16 ± 2 mm; p < .005) and fractional shortening (38 ± 5% to 32 ± 5%; p < 0.005) declined by 24% and 16%, respectively. The reduction in fractional shortening was related to ΔESD (r = -.66; p < .05) but not to ΔEDD (r = .22; NS). In spite of reduced afterload, the mean velocity of circumferential fiber shortening also decreased by an average of 9% (9 < .01) in proportion to the distance completed (r = -.69; p
CITATION STYLE
Niemela, K. O., Palatsi, I. J., & Ikaheimo, M. J. (1984). Evidence of impaired left ventricular performance after an uninterrupted competitive 24 hour run. Circulation, 70(3 I), 350–356. https://doi.org/10.1161/01.CIR.70.3.350
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