Table 5.
Anaerobic capacity repeated sprint performance results
| BA (n = 8) | BAC (n = 9) | CRE (n = 8) | PLA (n =7) | Time | P value | |
|---|---|---|---|---|---|---|
| Peak power (W/kg) | ||||||
| Wingate 1 | ||||||
| Baseline | 15.24 ± 4.87d | 14.74 ± 5.81d | 15.00 ± 3.95d | 11.09 ± 2.33abc | 14.13 ± 4.62 | T = 0.67 |
| 1 Week | 15.68 ± 3.85 | 13.88 ± 2.95 | 14.63 ± 2.82 | 13.43 ± 1.93 | 14.42 ± 2.97 | G = 0.46 |
| 4 Weeks | 14.77 ± 1.82 | 13.00 ± 3.40 | 13.46 ± 2.69 | 14.26 ± 4.73† | 13.83 ± 3.19 | T × G = 0.58 |
| Wingate 2 | G × W = 0.91 | |||||
| Baseline | 13.51 ± 1.37 | 13.22 ± 3.15 | 12.70 ± 3.22† | 13.77 ± 3.62 | 13.28 ± 2.83 | W = 0.59 |
| 1 Week | 14.97 ± 1.95 | 14.96 ± 3.80 | 13.30 ± 3.38 | 12.67 ± 3.04 | 14.05 ± 3.16 | T × W = 0.46 |
| 4 Weeks | 13.68 ± 1.40 | 13.60 ± 3.89 | 15.48 ± 4.47 | 12.61 ± 2.47 | 13.87 ± 3.33 | T × W × G = 0.02 |
| Mean power (W/kg) | ||||||
| Wingate 1 | ||||||
| Baseline | 6.13 ± 0.97 | 5.77 ± 0.59 | 5.87 ± 0.53 | 5.44 ± 1.21 | 5.81 ± 0.84 | T = 0.46 |
| 1 Week | 6.25 ± 0.83 | 5.89 ± 0.65 | 6.01 ± 0.65 | 5.39 ± 0.67 | 5.90 ± 0.74 | G = 0.36 |
| 4 Weeks | 6.07 ± 0.80 | 5.75 ± 0.61 | 5.65 ± 0.86 | 5.69 ± 0.76 | 5.79 ± 0.74 | T × G = 0.48 |
| Wingate 2 | G × W = 0.89 | |||||
| Baseline | 5.60 ± 0.87 | 5.42 ± 0.55 | 5.20 ± 0.54 | 5.10 ± 1.01 | 5.34 ± 0.74 | W = 0.006 |
| 1 Week | 5.48 ± 0.86 | 5.48 ± 0.62 | 5.37 ± 0.64 | 5.21 ± 0.96 | 5.39 ± 0.74 | T × W =0.58 |
| 4 Weeks | 5.27 ± 0.86 | 5.34 ± 0.57 | 5.19 ± 0.71 | 5.14 ± 1.05 | 5.24 ± 0.76 | T × W × G = 0.70 |
| Total work (J) | ||||||
| Wingate 1 | ||||||
| Baseline | 11,467 ± 1,048 | 10,476 ± 1,499 | 10,764 ± 1,420 | 9,541 ± 2,262 | 10,591 ± 1,653 | T = 0.97 |
| 1 Week | 11,793 ± 1,438 | 10,719 ± 1,531 | 11,081 ± 1,726 | 9,566 ± 1,422 | 10,826 ± 1,660 | G = 0.07 |
| 4 Weeks | 11,494 ± 1,430 | 10,561 ± 1,223 | 10,437 ± 2,071 | 10,152 ± 1,698 | 10,674 ± 1,621 | T × G = 0.33 |
| Wingate 2 | G × W = 0.92 | |||||
| Baseline | 10,565 ± 1,862 | 9,878 ± 1,678 | 9,545 ± 1,235 | 8,939 ± 1,800 | 9,761 ± 1,678 | W = 0.02 |
| 1 Week | 10,363 ± 1,767 | 9,986 ± 1,617 | 9,903 ± 1,605 | 8,220 ± 1,673 | 9,892 ± 1,633 | T × W =0.48 |
| 4 Weeks | 10,019 ± 1,785 | 9,835 ± 1,320 | 9,548 ± 1,556 | 9,168 ± 2,041 | 9,663 ± 1,619 | T × W × G = 0.66 |
| Rate of fatigue (%) | ||||||
| Wingate 1 | ||||||
| Baseline | 107.4 ± 13.9d | 104.1 ± 14.3d | 103.7 ± 21.0 | 92.4 ± 9.4ab | 102.3 ± 15.6 | T = 0.40 |
| 1 Week | 105.8 ± 14.1 | 102.0 ± 9.9 | 96.2 ± 16.6 | 108.4 ± 9.4† | 102.9 ± 13.1 | G = 0.09 |
| 4 Weeks | 109.8 ± 10.9d | 103.4 ± 10.3 | 104.2 ± 15.9 | 93.1 ± 12.4a | 102.7 ± 13.1 | T × G = 0.52 |
| Wingate 2 | G × W = 0.96 | |||||
| Baseline | 91.7 ± 12.0† | 101.9 ± 11.4 | 96.0 ± 14.8 | 92.9 ± 13.7 | 95.9 ± 13.0 | W = 0.02 |
| 1 Week | 102.4 ± 9.5 | 97.9 ± 13.5 | 99.6 ± 11.2 | 90.3 ± 21.0 | 97.8 ± 14.1 | T × W = 0.66 |
| 4 Weeks | 108.5 ± 13.8‡bd | 95.3 ± 16.6ad | 99.6 ± 15.9d | 82.8 ± 11.1abc | 99.1 ± 15.2 | T × W × Gq = 0.04 |
Data are means ± SD. BA signifies beta-alanine only group; BAC represents beta-alanine and creatine combined group; CRE represents the creatine only group; PLA represents the placebo group; T represents time p-level; G represents group p-level, W represents Wingate p-level, T × G represents time by group interaction, T × W × G represents time × group × Wingate interactions, q represents quadratic p-level. MANOVA analysis revealed overall Wilks’ Lambda time (p = 0.004), T × G (0.65), T × W (0.97), and T × G × W effects (p = 0.21). Univariate ANOVA p-levels from MANOVA analysis are presented for each variable. † represents p < 0.05 difference from Wingate 1 baseline while ‡ represents p < 0.05 difference from Wingate 2 baseline. arepresents p < 0.05 difference from BA group. brepresents p < 0.05 difference from BAC group. crepresents p < 0.05 difference from CRE group. drepresents p < 0.05 difference from PLA group. B