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The ACTN3 R577X polymorphism a genotype frequencies, b allele frequencies in track and field athletes and controls. *χ 2(2) = 8.50, p < 0.01, genotype frequency, LDR vs. controls. **χ 2(2) = 9.29, p < 0.01, genotype frequency, LDR vs. SDR. ***χ 2(2) = 9.41, p < 0.01, genotype frequency, SDR vs. controls. #χ 2(1) = 3.64, p = 0.06, allele frequency, LDR vs. controls. ##χ 2(1) = 10.42, p < 0.001, allele frequency, LDR vs. SDR. ###χ 2(1) = 4.32, p < 0.05, allele frequency, SDR vs. controls
