title: Sex, Sport, IGF-1 and the Community Effect in Height Hypothesis.
abstract: We test the hypothesis that differences in social status between groups of people within a population may induce variation in insulin-like growth factor-1(IGF-1) levels and, by extension, growth in height. This is called the community effect in height hypothesis. The relationship between IGF-1, assessed via finger-prick dried blood spot, and elite level sport competition outcomes were analysed for a sample of 116 undergraduate men and women. There was a statistically significant difference between winners and losers of a competition. Winners, as a group, had higher average pre-game and post-game IGF-1 levels than losers. We proposed this type of difference as a proxy for social dominance. We found no evidence that winners increased in IGF-1 levels over losers or that members of the same team were more similar in IGF-1 levels than they were to players from other teams. These findings provide limited support toward the community effect in height hypothesis. The findings are discussed in relation to the action of the growth hormone/IGF-1 axis as a transducer of multiple bio-social influences into a coherent signal which allows the growing human to adjust and adapt to local ecological conditions.
authors.affiliation: Centre for Global Health & Human Development, School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough LE11 3TU, UK. b.a.bogin@lboro.ac.uk.
authors.forename: Barry
authors.initials: B
authors.lastname: Bogin
authors.affiliation: Department of General Pediatrics, Christian-Albrechts-Universität Kiel, Kiel 24105, Germany. michael.hermanussen@gmail.com.
authors.forename: Michael
authors.initials: M
authors.lastname: Hermanussen
authors.affiliation: Center of Child and Adolescent Medicine, Justus-Liebig-University, Giessen 61250, Germany. wernblum@gmail.com.
authors.forename: Werner F
authors.initials: WF
authors.lastname: Blum
authors.affiliation: Department of Statistics and Econometrics, Otto-Friedrich-Universität Bamberg, Bamberg 96045, Germany. christian.assmann@uni-bamberg.de.
authors.forename: Christian
authors.initials: C
authors.lastname: Aßmann
mesh_terms: D000293:Adolescent; D000328:Adult; D056352:Athletes; D001827:Body Height; D004739:England; D005260:Female; D006801:Humans; D007334:Insulin-Like Growth Factor I / Q000378:metabolism*; D008297:Male; D012930:Social Dominance; D012944:Social Support; D013177:Sports; D055815:Young Adult
chemical_list: C583557:IGF1 protein, human; D007334:Insulin-Like Growth Factor I