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Unaltered left ventricular mechanics and remodelling after 12 weeks of resistance exercise training – a longitudinal study in men

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Author
Au, Jason
Oikawa, Sara
Morton, Robert
Phillips, Stuart
MacDonald, Maureen
Stöhr, Eric J.
Date
2019-01-08
Acceptance date
2018-12-10
Type
Article
Publisher
Canadian Science Publishing
ISSN
1715-5320
Metadata
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Abstract
Previous longitudinal studies suggest that left ventricular (LV) structure is unaltered with resistance exercise training (RT) in young men. However, evidence from aerobic exercise training suggests that early changes in functional LV wall mechanics may occur prior to and independently of changes in LV size, although short-term changes in LV mechanics and structural remodelling in response to RT protocols have not been reported. Therefore, the purpose of this study was to examine the effects of RT on LV mechanics in healthy men performing 2 different time-under-tension protocols. Forty recreationally trained men (age: 23 ± 3 years) were randomized into 12 weeks of whole-body higher-repetition RT (20–25 repetitions/set to failure at ∼30%–50% 1 repetition maximum (1RM); n = 13), lower-repetition RT (8–12 repetitions/set to failure at ∼75%–90% 1RM; n = 13), or an active control period (n = 14). Speckle tracking echocardiography was performed at baseline and following the intervention period. Neither RT program altered standard measures of LV volumes (end-diastolic volume, end-systolic volume, or ejection fraction; P > 0.05) or indices of LV mechanics (total LV twist, untwisting rate, twist-to-shortening ratio, untwisting-to-twist ratio, or longitudinal strain; P > 0.05). This is the first longitudinal study to assess both LV size and mechanics after RT in healthy men, suggesting a maintenance of LV size and twist mechanics despite peripheral muscle adaptations to the training programs. These results provide no evidence for adverse LV structural or functional remodelling in response to RT in young men and support the positive role of RT in the maintenance of optimal cardiovascular function, even with strenuous RT.
Journal/conference proceeding
Applied Physiology, Nutrition, and Metabolism;
Citation
Au, J.S., Oikawa, S.Y., Morton, R.W., Phillips, S.M., MacDonald, M.J. and Stöhr, E.J. (2019) 'Unaltered left ventricular mechanics and remodelling after 12 weeks of resistance exercise training – a longitudinal study in men', Applied Physiology, Nutrition, and Metabolism, 44(8), pp.820-826. DOI: 10.1139/apnm-2018-0544.
URI
http://hdl.handle.net/10369/10713
DOI
https://doi.org/10.1139/apnm-2018-0544
Description
Article published in Applied Physiology, Nutrition, and Metabolism on 08 January 2019 (online), available at: https://doi.org/10.1139/apnm-2018-0544.
Rights
http://www.rioxx.net/licenses/all-rights-reserved
Sponsorship
Cardiff Metropolitan University (Grant ID: Cardiff Metropolian (Internal))
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  • Sport Research Groups [1088]

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