Systolic and Diastolic Left Ventricular Mechanics during and after Resistance Exercise

Purpose: To improve the current understanding of the impact of resistance exercise on the heart, by examining the acute responses of left ventricular (LV) strain, twist, and untwisting rate ("LV mechanics"). Methods: LV echocardiographic images were recorded in systole and diastole before, during and immediately after (7–12 s) double-leg press exercise at two intensities (30% and 60% of maximum strength, one-repetition maximum). Speckle tracking analysis generated LV strain, twist, and untwisting rate data. Additionally, beat-by-beat blood pressure was recorded and systemic vascular resistance (SVR) and LV wall stress were calculated. Results: Responses in both exercise trials were statistically similar (P > 0.05). During effort, stroke volume decreased, whereas SVR and LV wall stress increased (P 0.05). Immediately after exercise, systolic LV mechanics returned to baseline levels (P

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