title: Effect of blood withdrawal on the left ventricular systolic time intervals at rest and during prolonged recovery following submaximal exercise.
abstract: 0.40 1 of full blood were withdrawn from 18 males aged 19-23. One day before withdrawal, one hour and 24 h after withdrawal the subjects performed a 10-min exercise on a Monark bicycle ergometer with a load producing heart rate acceleration up to 170/min. At rest and in the course of 120-min post-exercise recovery ventricular systolic time intervals were investigated using the method of Weissler. Immediately after blood withdrawal and one hour later the authors observed a decreased left ventricular ejection time index (LVETI), increased pre-ejection period (PEP), and increased isovolumetric contraction time (ICT), as well as increased PEP/LVET ratio. In the course of recovery following exercise performed one hour after withdrawal the LVET value was lower, and the values of PEP, ICT and PEP/LVET ratio higher than those obtained after identical exercise performed before withdrawal.
mesh_terms: D000328:Adult; D001810:Blood Volume; D006339:Heart Rate; D006801:Humans; D008297:Male; D009200:Myocardial Contraction; D005082:Physical Exertion; D013318:Stroke Volume; D013599:Systole