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    Hormonal factors in the development of differences in strength between boys and girls during adolescence: a longitudinal study.

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    Authors
    Round, J. M.
    Jones, David A.
    Honour, J. W.
    Nevill, Alan M.
    Issue Date
    1999
    
    Metadata
    Show full item record
    Abstract
    The development of elbow flexor (biceps) and knee extensor (quadriceps) strength has been followed in a mixed longitudinal study of 50 boys and 50 girls from the age of 8 to 17 years. Sex differences in strength emerged at the time of peak height velocity and were especially marked for the biceps. Data for individual children were aligned to the time of peak height velocity and associations between strength, height, weight and circulating testosterone were investigated using multi-level modelling. The results show that, for girls, quadriceps strength is proportional to height and weight while for boys there is an additional factor which can be fully attributed to increasing levels of testosterone. Testosterone is important in explaining differences in biceps strength between the sexes but an additional factor is also required. It is suggested that, in addition to a direct effect on muscle, testosterone could have a second indirect action on biceps strength by promoting growth in length of the humerus as part of the general development of the male upper limb girdle.
    Citation
    Annals of Human Biology, 26(1): 49-62
    Publisher
    Taylor & Francis for the Society for the Study of Human Biology
    Journal
    Annals of Human Biology
    URI
    http://hdl.handle.net/2436/66083
    PubMed ID
    9974083
    Additional Links
    http://www.ingentaconnect.com/content/apl/tahb/1999/00000026/00000001/art00005
    Type
    Journal article
    Language
    en
    ISSN
    0301-4460
    Collections
    Faculty of Education, Health and Wellbeing

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