Table 1. Mean estimates of study phenotypes by genotypes of the K153R (rs1805086) polymorphism in the GDF8 gene in men.
| KK (n = 201) | KR (n = 15) | P | R2 | Cohen's d | (95%CI) | |||
| Vertical Jump Tests | ||||||||
| SJ | ||||||||
| Flight time (s) | 563.09 | (38.95) | 533.94 | (43.13) | 0.007 | 0.100 | 0.74 | 0.461–1.014 |
| Vertical displacement of CG (cm) | 39.06 | (5.44) | 35.17 | (5.49) | 0.009 | 0.095 | 0.71 | 0.431–0.983 |
| CMJ | ||||||||
| Flight time (s) | 574.35 | (39.62) | 543.29 | (46.20) | 0.005 | 0.057 | 0.76 | 0.483–1.038 |
| Vertical displacement of CG (cm) | 40.63 | (5.67) | 36.44 | (5.92) | 0.008 | 0.053 | 0.72 | 0.446–0.999 |
| Sprint Tests | ||||||||
| 30m running start | ||||||||
| Time at 15 m (s) | 1.92 | (0.14) | 1.91 | (0.08) | 0.684 | 0.049 | 0.11 | −0.159–0.378 |
| Time at 30 m (s) | 3.76 | (0.21) | 3.75 | (0.17) | 0.987 | 0.065 | 0.00 | −0.263–0.273 |
| 30m standing start | ||||||||
| Time at 15 m (s) | 2.54 | (0.12) | 2.56 | (0.13) | 0.533 | 0.002 | −0.17 | −0.436–0.101 |
| Time at 30 m (s) | 4.41 | (0.19) | 4.44 | (0.23) | 0.559 | 0.014 | 0.16 | −0.111–0.425 |
Values are means (standard deviation).
P values related to group differences (one way analysis of covariance after adjusting for age, weight and height).
Cohen's d (standardized mean differences) and 95% confidence interval (CI). Values of d 0.2, 0.5 and 0.8 are considered small, medium and large effects, respectively.
Abbreviations: SJ, squat jump; CMJ, counter-movement jump; CG, centre of gravity.