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(Chest. 2001;119:150-154.)
© 2001 American College of Chest Physicians

Left Ventricular Wall Stress During Leg-Press Exercise Performed With a Brief Valsalva Maneuver*

Mark Haykowsky, PhD; Dylan Taylor, MD; Koon Teo, MB, PhD; Arthur Quinney, PhD and Dennis Humen, MD

* From the Faculty of Physical Education and Recreation (Drs. Haykowsky and Quinney), and Division of Cardiology (Drs. Haykowsky, Taylor, Teo, and Humen), Faculty of Medicine, University of Alberta, Edmonton, Alberta, Canada.

Correspondence to: Mark Haykowsky, PhD, Faculty of Rehabilitation Medicine, 2–50 Corbett Hall, University of Alberta, Edmonton, Alberta, Canada T6G 2G4; e-mail: mark.haykowsky{at}ualberta.ca

Study objectives: To assess the effects of leg-press (LP) exercise performed with a brief (2 to 3 s) Valsalva maneuver on left ventricular (LV) systolic function and LV wall stress in five healthy men (mean ± SD age, 27.6 ± 2.9 years).

Methods and measurements: Subjects performed submaximal (80% one repetition maximum [1RM], 337.9 ± 109.1 kg; 95% 1RM, 400.6 ± 129.8 kg) and maximal LP exercise (420 ± 118.6 kg) during which central arterial pressure, intrathoracic pressure, and two-dimensional echocardiographic analysis of LV systolic function and LV wall stress were measured.

Results: Compared with baseline, LP exercise resulted in an increase in intrathoracic pressure (baseline, 1.7 ± 2.9 mm Hg; 80% 1RM, 111.7 ± 20.2 mm Hg; 95% 1RM, 112.2 ± 21.1 mm Hg; 100% 1RM, 111.0 ± 21.3 mm Hg; p < 0.05) and LV end-systolic pressure (baseline, 120.0 ± 13.2 mm Hg; 80% 1RM, 251.6 ± 15.3 mm Hg; 95% 1RM, 255.3 ± 12.2 mm Hg; 100% 1RM, 242.8 ± 16.5 mm Hg; p < 0.05) with no changes in LV end-systolic transmural pressure (baseline, 118.3 ± 12.6 mm Hg; 80% 1RM, 140.0 ± 6.1 mm Hg; 95% 1RM, 143.1 ± 16.1 mm Hg; 100% 1RM, 131.8 ± 29.7 mm Hg; p > 0.05), LV end-systolic wall stress (baseline, 91.7 ± 20.2 kilodyne/cm2; 80% 1RM, 78.0 ± 24.4 kilodyne/cm2; 95% 1RM, 81.4 ± 25.3 kilodyne/cm2; 100% 1RM, 85.9 ± 20.1 kilodyne/cm2; p > 0.05), or LV fractional area change (baseline, 0.48 ± 0.03; 80% 1RM, 0.52 ± 0.11; 95% 1RM, 0.53 ± 0.06; 100% 1RM, 0.52 ± 0.05; p > 0.05).

Conclusion: LP exercise performed with a brief Valsalva maneuver is not associated with an alteration in LV wall stress or LV systolic function in healthy young men.

Key Words: left ventricular systolic function • leg-press exercise • Valsalva maneuver • wall stress






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Copyright © 2001 by the American College of Chest Physicians.