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    A prospective randomised longitudinal MRI study of left ventricular adaptation to endurance and resistance exercise training in humans

    Access Status
    Open access via publisher
    Authors
    Spence, Angela
    Naylor, L.
    Carter, H.
    Buck, C.
    Dembo, L.
    Murray, C.
    Watson, P.
    Oxborough, D.
    George, K.
    Green, D.
    Date
    2011
    Type
    Journal Article
    
    Metadata
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    Citation
    Spence, A. and Naylor, L. and Carter, H. and Buck, C. and Dembo, L. and Murray, C. and Watson, P. et al. 2011. A prospective randomised longitudinal MRI study of left ventricular adaptation to endurance and resistance exercise training in humans. Journal of Physiology. 589 (22): pp. 5443-5452.
    Source Title
    Journal of Physiology
    DOI
    10.1113/jphysiol.2011.217125
    ISSN
    0022-3751
    URI
    http://hdl.handle.net/20.500.11937/46454
    Collection
    • Curtin Research Publications
    Abstract

    The principle that 'concentric' cardiac hypertrophy occurs in response to strength training, whilst 'eccentric' hypertrophy results from endurance exercise has been a fundamental tenet of exercise science. This notion is largely based on cross-sectional comparisons of athletes using echocardiography. In this study, young (27.4 ± 1.1 years) untrained subjects were randomly assigned to supervised, intensive, endurance (END, n= 10) or resistance (RES, n= 13) exercise and cardiac MRI scans and myocardial speckle tracking echocardiography were performed at baseline, after 6 months of training and after a subsequent 6 weeks of detraining. Aerobic fitness increased significantly in END (3.5 to 3.8 l min -1, P < 0.05) but was unchanged in RES. Muscular strength significantly improved compared to baseline in both RES and END (?= 53.0 ± 1.1 versus 36.4 ± 4.5 kg, both P < 0.001) as did lean body mass (2.3 ± 0.4 kg, P < 0.001 versus 1.4 ± 0.6 kg P < 0.05). MRI derived left ventricular (LV) mass increased significantly following END (112.5 ± 7.3 to 121.8 ± 6.6 g, P < 0.01) but not RES, whilst training increased end-diastolic volume (?LVEDV, END: +9.0 ± 5.0 versus RES +3.1 ± 3.6 ml, P= 0.05). Interventricular wall thickness significantly increased with training in END (1.06 ± 0.0 to 1.14 ± 0.06, P < 0.05) but not RES. Longitudinal strain and strain rates did not change following exercise training. Detraining reduced aerobic fitness, LV mass and wall thickness in END (P < 0.05), whereas LVEDV remained elevated. This study is the first to use MRI to compare LV adaptation in response to intensive supervised endurance and resistance training. Our findings provide some support for the 'Morganroth hypothesis', as it pertains to LV remodelling in response to endurance training, but cast some doubt over the proposal that remodelling occurs in response to resistance training

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