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Table 5 Anaerobic capacity repeated sprint performance results

From: Effects of 28 days of beta-alanine and creatine supplementation on muscle carnosine, body composition and exercise performance in recreationally active females

  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
  1. 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
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