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Impact of exercise training on endothelial function and body composition in young people: a study of mono- and di-zygotic twins

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Abstract

Flow mediated dilation (FMD) is a surrogate marker of arterial function which can be improved by exercise training. To date, no study has assessed the magnitude of FMD changes in response to exercise training between groups of mono- (MZ) and di-zygotic (DZ) twins. The purpose of this study was therefore to compare FMD in MZ- and DZ twins before and after identical exercise training interventions. At baseline, FMD was assessed using high resolution Duplex ultrasound in 12 twin pairs (6 MZ pairs 13.5 ± 0.8 years, 6 DZ pairs 13.4 ± 0.8 years). Twins completed 8 weeks of exercise training (65–85% HRmax), consisting of three 45-min sessions per week. Change (Δ) scores were entered into twin versus twin intraclass correlation analyses by group. Change in %body fat (r = 0.63, P = 0.05) was significantly correlated in the MZ, but not the DZ group (r = 0.31, P = 0.23). Change in FMD was also highly correlated in MZ (r = 0.74, P = 0.02) but not in the DZ group (r = 0.37, P = 0.18). Heritability of ΔFMD was estimated at 0.74. Exercise induced changes in FMD were similar within sets of monozygotic twins but not dizygotic twins. These data suggest that a significant portion of the arterial function response to exercise training may be genetically determined.

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Acknowledgments

This work was supported by the Liverpool Area Based Grants Scheme. Professor Green is supported by the National Heart Foundation of Australia and the Australian Research Council. The authors have no conflicts of interest to declare.

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Authors and Affiliations

  1. Research Institute for Sport and Exercise Sciences, Tom Reilly Building, Liverpool John Moores University, Byrom St., Liverpool, L3 3AF, UK

    N. D. Hopkins, G. Stratton, N. T. Cable, T. M. Tinken, L. E. F. Graves & D. J. Green

  2. School of Sports Science, Exercise and Health, The University of Western Australia, Crawley, 6009, Australia

    D. J. Green

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  1. N. D. Hopkins
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  2. G. Stratton
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  3. N. T. Cable
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  4. T. M. Tinken
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  5. L. E. F. Graves
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  6. D. J. Green
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Correspondence to N. D. Hopkins.

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Communicated by Niels H. Secher.

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Hopkins, N.D., Stratton, G., Cable, N.T. et al. Impact of exercise training on endothelial function and body composition in young people: a study of mono- and di-zygotic twins. Eur J Appl Physiol 112, 421–427 (2012). https://doi.org/10.1007/s00421-011-1993-1

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  • DOI: https://doi.org/10.1007/s00421-011-1993-1

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