Impairment of left ventricular function during maximal isometric dead lifting

Abstract

High-intensity short-duration lifting is frequently performed by athletes and laborers. Little is known about the magnitude and pattern of blood pressure response and resultant effects on left ventricular (LV) function during this form of intense isometric exercise. We monitored brachial intra-arterial pressure and LV ejection fraction (LVEF) during upright isometric dead lifting performed on a force platform. Fourteen healthy male subjects (age 27 yr) maintained maximal sustained isometric dead lift (140 +/- 34 kg) for 32 s. LVEF was measured by 99mTc first-pass radionuclide ventriculography. Mean arterial pressure increased from 107 +/- 15 mmHg at rest to a peak of 174 +/- 28 mmHg and fell precipitously to 88 +/- 13 mmHg within 10 s after release of the dead lift. LVEF decreased from 63 +/- 8 to 51 +/- 14% (P less than 0.02) in seven subjects with technically acceptable ventriculograms. We conclude that maximal upright isometric dead-lift exercise produces a marked increase in arterial pressure and corresponding LV afterload that is associated with a transient reduction in LVEF in normal men.