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    Can greater muscularity in larger individuals resolve the 3/4 power-law controversy when modelling maximum oxygen uptake?

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    Authors
    Nevill, Alan M.
    Markovic, G
    Vucetic, V
    Holder, Roger L.
    Issue Date
    2004
    Submitted date
    2007-03-14
    
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    Abstract
    BACKGROUND: The power function relationship, MR = a.m(b), between metabolic rate (MR) and body mass m has been the source of much controversy amongst biologists for many years. Various studies have reported mass exponents (b) greater than the anticipated 'surface-area' exponent 0.67, often closer to 0.75 originally identified by Kleiber. AIM: The study aimed to provide a biological explanation for these 'inflated' exponents when modelling maximum oxygen uptake (max), based on the observations from this and previous studies that larger individuals develop disproportionately more muscle mass in the arms and legs. RESEARCH DESIGN AND SUBJECTS: A cross-sectional study of 119 professional soccer players from Croatia aged 18-34 was carried out. RESULTS: Here we confirm that the power function relationship between max and body mass of the professional soccer players results in an 'inflated' mass exponent of 0.75 (95% confidence interval from 0.56 to 0.93), but also the larger soccer players have disproportionately greater leg muscle girths. When the analysis was repeated incorporating the calf and thigh muscle girths rather than body mass as predictor variables, the analysis not only explained significantly more of the variance in max, but the sum of the exponents confirmed a surface-area law. CONCLUSIONS: These findings confirm the pitfalls of fitting body-mass power laws and suggest using muscle-girth methodology as a more appropriate way to scale or normalize metabolic variables such as max for individuals of different body sizes.
    Citation
    Annals of Human Biology, 31(4): 436-445
    Publisher
    Taylor & Francis
    URI
    http://hdl.handle.net/2436/11119
    DOI
    10.1080/03014460410001723996
    PubMed ID
    15513694
    Additional Links
    https://www.tandfonline.com/doi/abs/10.1080/03014460410001723996
    Type
    Journal article
    Language
    en
    ISSN
    0301-4460
    ae974a485f413a2113503eed53cd6c53
    10.1080/03014460410001723996
    Scopus Count
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    Faculty of Education, Health and Wellbeing

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