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Table 4 Blood lactate results observed during the maximal exercise test

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
Resting lactate (mmol/L)
 Baseline 1.44 ± 0.64 1.51 ± 0.44 1.33 ± 0.24 2.03 ± 0.96 1.56 ± 0.63 T = 0.71
 1 Week 1.60 ± 0.61 1.43 ± 0.58 1.18 ± 0.28 1.54 ± 0.46 1.43 ± 0.51 G = 0.15
 4 Weeks 1.58 ± 0.43 1.36 ± 0.49 1.53 ± 0.47 1.66 ± 0.45 1.52 ± 0.45 T × G = 0.38
 Group 1.54 ± 0.12 1.43 ± 0.11 1.34 ± 0.12 1.74 ± 0.13   
Peak lactate (mmol/L)  
 Baseline 12.91 ± 4.48bcd 8.63 ± 3.34a 9.71 ± 1.83a 7.54 ± 2.26 9.73 ± 3.64 T = 0.10
 1 Week 10.43 ± 2.27 8.93 ± 3.18 9.20 ± 2.15 8.76 ± 1.25 9.33 ± 2.36 G = 0.07
 4 Weeks 9.85 ± 1.89† 8.04 ± 2.59 8.99 ± 1.46 8.64 ± 2.28 8.87 ± 2.12 T × G = 0.05
 Group 11.06 ± 0.77bd 8.54 ± 0.73a 9.30 ± 0.77 8.31 ± 0.83a   
Lactate threshold (% Peak VO2)
 Baseline 65.18 ± 8.37 67.12 ± 14.08 66.09 ± 7.54 66.40 ± 10.14 66.22 ± 7.45 T = 0.14
 1 Week 68.86 ± 5.98 69.92 ± 7.44 67.31 ± 6.64 64.51 ± 6.88 67.82 ± 6/75 G = 0.91
 4 Weeks 67.04 ± 7.66 69.04 ± 6.91 69.61 ± 9.42 73.53 ± 5.83 69.67 ± 7.58 T × G = 0.86
 Group 67.03 ± 1.73 68.70 ± 1.63 67.67 ± 1.73 68.15 ± 1.85   
Onset of blood lactate (%VO2peak)
 Baseline 77.50 ± 9.89 82.94 ± 10.9 81.71 ± 8.82 83.81 ± 8.82 81.47 ± 9.54 T = 0.13
 1 Week 78.50 ± 10.1 84.90 ± 9.30 83.48 ± 7.67 75.17 ± 17.43 80.82 ± 11.5 G = 0.58
 4 Weeks 84.14 ± 8.35 86.68 ± 8.51 83.76 ± 11.68 84.77 ± 11.93 84.90 ± 9.70 T × G = 0.81
 Group 80.05 ± 2.61 84.84 ± 2.46 82.98 ± 2.61 81.25 ± 2.79   
Blood lactate difference from baseline to max (mmol/L)
 Baseline 11.48 ± 4.19bcd 7.10 ± 3.52a 8.39 ± 1.75ad 5.51 ± 2.15ac 8.17 ± 3.67 T = 0.08
 1 Week 8.83 ± 2.64† 7.43 ± 3.31 8.03 ± 2.03 7.20 ± 1.59 7.88 ± 2.49 G = 0.06
 4 Weeks 8.28 ± 1.88† 6.61 ± 2.73 7.46 ± 1.26 6.81 ± 2.24 7.28 ± 2.12 T × G = 0.02
 Group 9.53 ± 0.79 7.05 ± 0.74 7.96 ± 0.79 6.51 ± 0.84   
  1. Individual group and time data are presented as means ± SD while time and group effects are presented as means ± SEM. MANOVA analysis revealed overall Wilks’ Lambda time (p = 0.33) and group × time (p = 0.34) effects. Univariate ANOVA p-levels from MANOVA analysis are presented for each variable. 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, and T × G represents interaction. † represents p < 0.05 difference from 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.
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