Genetic influences on the development of grip strength in adolescence

ABSTRACT Enhanced physical strength is a secondary sex characteristic in males. Sexual dimorphism in physical strength far exceeds sex differences in stature or total body mass, suggesting a legacy of intense sexual selection. Upper‐body strength is a particularly promising marker of intrasexual com...

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Vydáno v:American journal of physical anthropology Ročník 154; číslo 2; s. 189 - 200
Hlavní autoři: Isen, Joshua, McGue, Matt, Iacono, William
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States Blackwell Publishing Ltd 01.06.2014
Wiley Subscription Services, Inc
Témata:
Adolescence
Adolescent
Adolescent Development - physiology
Adolescents
Anthropology, Physical
Body weight
Competition
Competitiveness
Developmental processes
Endogenous
Female
Females
Gender
Gender differences
Gene expression
Genetic effects
Genetic variance
Genetics
Grip strength
growth
Hand Strength - physiology
Height
Heritability
Humans
Individual differences
Male
Males
Muscle Strength - genetics
Partition
physical strength
Sex Characteristics
Sex differences
sexual dimorphism
Twins
Twins - genetics
Variance
Young men
ISSN:0002-9483, 1096-8644, 1096-8644, 2692-7691
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Shrnutí:ABSTRACT Enhanced physical strength is a secondary sex characteristic in males. Sexual dimorphism in physical strength far exceeds sex differences in stature or total body mass, suggesting a legacy of intense sexual selection. Upper‐body strength is a particularly promising marker of intrasexual competitiveness in young men. Consequently, it is assumed that sex‐influenced gene expression contributes to the development of physical strength. It is unclear, however, whether the underlying sources of individual differences in strength development are comparable across sex. We obtained three measurements of hand‐grip strength (HGS) over a six‐year period spanning adolescence in male and female same‐sex twins (N = 2,513). Biometrical latent growth models were used to partition the HGS variance at age 11 (intercept) and its growth over time (slope) into genetic and environmental components. Results demonstrated that variance around the intercept was highly heritable in both males and females (88% and 79%, respectively). In males, variance around the slope exceeded that of the intercept, while the reverse held for females. Additive genetic effects accounted for most (80%) of the variance around the slope in males, but were of less importance in females (heritability = 28%). Absolute genetic variance around the slope was nearly nine‐fold higher in males. This striking disparity suggests that the developmental processes shaping HGS growth are different between the sexes. We propose that this might account for the sex‐specific pattern of associations between HGS and external measures (e.g., digit ratio and physical aggression) typically reported in the literature. Our results underscore the role of endogenous androgenic influences in the development of physical strength. Am J Phys Anthropol 154:189–200, 2014. © 2014 Wiley Periodicals, Inc.
Bibliografie:ArticleID:AJPA22492
ark:/67375/WNG-LZTXDWLZ-7
istex:6B18DFD207097DBF5C47EE7C27A01EF43C22970A
National Institutes of Health - No. DA 013240; No. DA 05147; No. AA 09367
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ISSN:0002-9483
1096-8644
1096-8644
2692-7691
DOI:10.1002/ajpa.22492