Systolic and Diastolic Left Ventricular Mechanics during and after Resistance Exercise

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Author
Stöhr, Eric J.
Stembridge, Mike
Shave, Rob
Samuel, Jake
Stone, Keeron J.
Esformes, Joseph I.
Date
2017-05-16Acceptance date
2017-05-12
Type
Article
Publisher
Lippincott, Williams & Wilkins
ISSN
0195-9131
1530-0315 (ESSN)
Metadata
Show full item recordAbstract
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, 1-repetition-maximum, 1RM). 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 while SVR and LV wall stress increased (P < 0.05). Immediately following effort, stroke volume returned to baseline while SVR and wall stress decreased (P < 0.05). Similarly, acute exercise was accompanied by a significant decrease in systolic parameters of LV muscle mechanics (P < 0.05). However, diastolic parameters, including LV untwisting rate, were statistically unaltered (P > 0.05). Immediately following exercise, systolic LV mechanics returned to baseline levels (P < 0.05) but LV untwisting rate increased significantly (P < 0.05).
CONCLUSIONS:
A single, acute bout of double leg-press resistance exercise transiently reduces systolic LV mechanics, but increases diastolic mechanics following exercise, suggesting that resistance exercise has a differential impact on systolic and diastolic heart muscle function. The findings may explain why acute resistance exercise has been associated with reduced stroke volume but chronic exercise training may result in increased LV volumes.
Journal/conference proceeding
Medicine and Science in Sports and Exercise;
Citation
Stöhr, E.J., Stembridge, M., Shave, R., Samuel, T.J., Stone, K. and Esformes, J.I. (2017) 'Systolic and Diastolic Left Ventricular Mechanics during and after Resistance Exercise', Medicine and Science in Sports and Exercise, 49 (10), pp.2025–2031
Description
This article was published in Medicine and Science in Sports and Exercise on 16.5.17 (online), available at http://dx.doi.org/10.1249/MSS.0000000000001326
Sponsorship
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
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