Bell, W., Colley, James, Evans, W.D. ![]() |
Abstract
Background and aim: To identify the distribution and explore the relationship between ACTN3 genotypes and power and body composition phenotypes. Subjects and methods: Case control and association studies were employed using a homogeneous group of players (n == 102) and a control group (n == 110). Power-related phenotypes were measured using the counter movement jump (CMJ) and body composition phenotypes by dual-energy X-ray absorptiometry (DXA). Statistics used were Pearson's chi-square, ANCOVA, coefficients of correlation and independent t-tests. Genotyping was carried out using polymerase chain reaction followed by enzymatic Ddel digestion. Results: Genotype proportions of players were compared with controls (p == 0.07). No significant genotype differences occurred between forwards or backs (p == 0.822) or within-forwards (p == 0.882) or within-backs (p == 0.07). Relative force and velocity were significantly larger in backs, power significantly greater in forwards; in body composition, all phenotypes were significantly greater in forwards than backs. Correlations between phenotypes were greater for the RX genotype (p == 0.05-0.01). Conclusions: Relationships between ACTN3 genotypes and power or body composition-related phenotypes were not significant. As fat increased, power-related phenotypes decreased. As body composition increased, power-related phenotypes increased.
Item Type: | Article |
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Date Type: | Publication |
Status: | Published |
Schools: | Medicine |
Subjects: | R Medicine > RC Internal medicine > RC1200 Sports Medicine |
Uncontrolled Keywords: | Rugby union, α-actinin-3, power output, body composition |
Publisher: | Informa Healthcare |
ISSN: | 0301-4460 |
Last Modified: | 20 Oct 2022 08:36 |
URI: | https://orca.cardiff.ac.uk/id/eprint/28927 |
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