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Athletic performance and birth month: Is the relative age effect more than just selection bias?

Sandercock, GRH and Ogunleye, AA and Parry, DA and Cohen, DD and Taylor, MJD and Voss, C (2014) 'Athletic performance and birth month: Is the relative age effect more than just selection bias?' International Journal of Sports Medicine, 35 (12). 1017 - 1023. ISSN 0172-4622

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Abstract

The aim of this study was to determine if month of birth affects performance in 3 tests of physical function in children and adolescents. We measured cardiorespiratory fitness, handgrip strength and lower-body power expressed them relative to (whole year) age then compared scores between calendar year birth-months. We also expressed test performance as the likelihood of achieving criterion-referenced fitness standards. There were significant main effects of birth-month for cardiorespiratory fitness (F=4.54, p<0.001), strength (F=6.81, p<0.001) and power (F=3.67, p<0.001). Children born in November were fitter and more powerful than those born at other times, particularly the summer months (April, May and June). October-born children were stronger than those born in all months except September and November. This relationship was evident despite controlling for decimal age and despite no significant inter-month differences in anthropometric characteristics. There is a clear physical advantage for those born in the autumn and this may explain some of the bias in sports selection attributed to the relative age effect, particularly when the British school-year (September) cut-off is used.

Item Type: Article
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Faculty of Science and Health > Sport, Rehabilitation and Exercise Sciences, School of
Depositing User: Jim Jamieson
Date Deposited: 10 Jun 2014 07:27
Last Modified: 30 Jan 2019 16:19
URI: http://repository.essex.ac.uk/id/eprint/9686

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