Ac. Lentini et al., LEFT-VENTRICULAR RESPONSE IN HEALTHY-YOUNG MEN DURING HEAVY-INTENSITYWEIGHT-LIFTING EXERCISE, Journal of applied physiology, 75(6), 1993, pp. 2703-2710
We examined cardiac volumes (using echocardiography), intra-arterial b
lood pressure (BP), and intrathoracic pressure (ITP) in healthy males
performing leg press exercise to failure at 95% of their maximum dynam
ic strength. Compared with preexercise, during the lifting phase of ex
ercise, end-diastolic volume (EDV; 147 +/- 8 to 103 +/- 7 ml) and end-
systolic volume (ESV; 54 +/- 5 to 27 +/- 4 ml) decreased (P < 0.05); h
eart rate (82 +/- 6 to 143 +/- 5 beats/min), systolic BP (160 +/- 6 to
270 +/- 21 Torr), diastolic BP (91 +/- 2 to 183 +/- 18 Torr), ITP (0.
8 +/- 0.8 to 57.8 +/- 24 Torr), and peak systolic BP/ESV (SBP/ESV; 3.0
+/- 0.3 to 11.0 +/- 1.5 Torr/ml) increased (P < 0.05); and stroke vol
ume decreased (94 +/- 3 to 77 +/- 4 ml; P > 0.05). Full knee extension
was associated with most values returning to preexercise levels excep
t for ESV (38 +/- 7 ml), heart rate (130 +/- 9 beats/min), and ITP (-1
2.5 +/- 2.1 Torr). During the lowering phase, significant decreases in
EDV to 105 +/- 14 ml and ESV to 27 +/- 7 ml were observed with increa
ses in systolic BP to 207 +/- 23 Torr, diastolic BP to 116 +/- 8 Torr,
and SBP/ESV to 10.0 +/- 2.5 Torr/ml. Stroke volume decreased to 78 +/
- 9 ml (P > 0.05). Thus rapid changes in cardiac volumes, contractilit
y, and pressure occur during weight lifting that are related to differ
ent phases of the lift.