European Journal of Echocardiography Advance Access originally published online on March 11, 2008
European Journal of Echocardiography 2008 9(4):542-546; doi:10.1093/ejechocard/jen114
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Longitudinal plane colour tissue-Doppler myocardial velocities and their association with left ventricular length, volume, and mass in humans
1 Centre for Food, Physical Activity, and Obesity Research, University of Teesside, Middlesbrough, UK
2 Centre for Sport Medicine and Human Performance, Brunel University, Uxbridge, London, UK
3 School of Healthcare, Leeds University, Leeds, UK
4 Research Institute for Sport and Exercise Sciences, Liverpool John Moores University, 15–21 Webster Street, Liverpool L3 2ET, UK
Received 16 May 2007; accepted after revision 30 September 2007; online publish-ahead-of-print 11 March 2008.
* Corresponding author. Tel: +44 151 231 4088; fax: +44 151 231 4353. E-mail address: k.george{at}ljmu.ac.uk
| Abstract |
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Aims: We investigated the relationships between colour tissue-Doppler parameters of left ventricular (LV) function and indices of LV morphology.
Methods and results: LV length, end-diastolic volume, and mass were assessed in 40 healthy adult subjects. Further, colour tissue-Doppler scans assessed peak myocardial velocities during systole (S') and early diastole (E') as well as acceleration during isovolumic contraction (IVCa) at the mitral annulus. Non-linear allometric relationships (Y = aXb) were calculated to provide size exponents (b), with 95% confidence intervals, for tissue-Doppler variables (Y) and LV morphology parameters (X). The b exponents for LV length with Peaks S' and E' were not substantially different from unity (b = 0.87 and 0.95, respectively, P > 0.05). Peak E' was also associated with LV volume (b = 0.39, r = 0.53, P < 0.05). IVCa was not related to any LV morphology parameter.
Conclusion: Peak S' or E' divided by LV length was confirmed as a valid size-independent scaling index. Conversely, IVCa is seemingly size independent.
Keywords: Scaling; Normalisation; Allometry; Athlete's heart