A Systematic Review and Meta-analysis of the Association Between ACTN3 R577X Genotypes and Performance in Endurance Versus Power Athletes and Non-athletes

Sports Medicine - Open

Table 3 Percentage distribution of RR, RX and XX genotypes in the different groups. Values are means and 95% CI

Groups	Mean	Lower 95% CI	Upper 95% CI
Power athletes
RR	38.44	34.45	42.43
RX	47.50	44.84	50.17
XX	14.05	10.93	17.18
Endurance athletes
RR	33.07	26.22	39.91
RX	48.80	44.99	52.61
XX	18.13	10.75	25.50
Controls
RR	29.22	24.82	33.62
RX	52.09	48.80	55.38
XX	18.65	15.09	22.20
Male power athletes
RR	42.09	29.96	54.23
RX	48.85	40.71	56.99
XX	9.05	− 1.83	19.94
Female power athletes
RR	42.50	38.85	46.16
RX	45.45	37.38	53.52
XX	12.05	4.28	19.81