ACTN3 genotype, athletic status, and life course physical capability: meta-analysis of the published literature and findings from nine studies. by Alfred, T, Ben-Shlomo, Y, Cooper, R, Hardy, R, Cooper, C, Deary, I, Gunnell, D, Harris, SE, Kumari, M, Martin, R, Moran, C, Pitsiladis, Y, Ring, S, Sayer, A, Smith, G, Starr, J, Kuh, D, Day, I