Table 4.
Performance variables during neuromuscular tests with ingestion of 3 mg·kg−1 bm caffeine or a placebo in professional handball players with different genotypes in the 1976T > C polymorphism of the ADORA2A gene.
| Variable (Units) | ADORA2A Genotype | Placebo | Caffeine | % Change | ES [95%CI] | Interaction |
|---|---|---|---|---|---|---|
| CMJ (cm) | TT | 32.70 ± 8.8 | 33.45 ± 8.5 | 2.3 | 0.09 [−0.38, 0.55] | 0.602 |
| C-allele | 33.10 ± 7.7 | 34.24 ± 7.7 | 3.4 | 0.15 [0.04, 0.26] | ||
| SV (s) | TT | 4.75 ± 0.44 | 4.68 ± 0.45 | 1.4 | −0.16 [−0.62, 0.31] | 0.866 |
| C-allele | 4.73 ± 0.40 | 4.59 ± 0.42 | 3.0 | −0.34 [−0.45, −0.23] | ||
| MATT (s) | TT | 6.05 ± 0.65 | 6.06 ± 0.59 | −0.1 | 0.02 [−0.45, 0.48] | 0.600 |
| C-allele | 5.76 ± 0.52 | 5.74 ± 0.39 | 0.3 | −0.04 [−0.15, 0.07] | ||
| IHS (kg) | TT | 40.67 ± 10.17 | 43.70 ± 12.38 | 7.5 | 0.27 [−0.20, 0.73] | 0.575 |
| C-allele | 46.86 ± 12.65 | 47.30 ± 11.81 | 0.9 | 0.04 [−0.07, 0.15] | ||
| BT7M (km/h) | TT | 79.20 ± 9.47 | 77.80 ± 3.63 | −1.8 | −0.20 [−0.66, 0.27] | 0.879 |
| C-allele | 83.88 ± 9.34 | 85.20 ± 9.01 | 1.6 | 0.14 [0.03, 0.25] | ||
| BT7M + GK (km/h) | TT | 78.80 ± 6.91 | 77.40 ± 1.52 | −1.8 | −0.28 [−0.74, 0.18] | 0.151 |
| C-allele | 82.88 ± 7.79 | 83.44 ± 7.63 | 0.7 | 0.07 [−0.04, 0.18] | ||
| BT9M (km/h) | TT | 79.60 ± 4.22 | 79.80 ± 4.66 | 0.3 | 0.04 [−0.42, 0.51] | 0.255 |
| C-allele | 83.32 ± 7.97 | 85.88 ± 7.25 | 3.1 | 0.34 [0.22, 0.45] | ||
| BT9M + GK (km/h) | TT | 78.40 ± 3.65 | 80.40 ± 4.16 | 2.6 | 0.51 [0.04, 0.98] | 0.443 |
| C-allele | 84.80 ± 7.39 | 86.48 ± 7.07 | 2.0 | 0.23 [0.12, 0.34] |
Abbreviations: CMJ: countermovement jump; SV: sprint velocity test; MATT; modified agility t-test; IHS: isometric handgrip strength; BT7M: ball throw 7-m, BT7M + GK: ball throw 7-m with goalkeeper; BT9M: ball throw 9-m; BT9 + GK: ball throw 9-m with goalkeeper; ES: effect size; CI: confidence interval.