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Table 3 Effects of the 5-week resistance training program in the PLA and BA groups

From: Effects of β-alanine supplementation during a 5-week strength training program: a randomized, controlled study

Variable

Group

Pre (mean ± SD ± CI)

Post (mean ± SD ± CI)

Post-Pre(u)

Post-Pre (%)

CI (95%)

p for Group

p for Time

p for GroupXTime

Kg at 1RM (kg)

PLA

123.92 ± 18.02 (112.38–135.45)

139.33 ± 15.13 (129.45–149.22)

15.41

12.44%

121.16–142.09

0.484

< 0.001*

0.014*

BA

124.57 ± 20.42 (113.89–135.25)

148.50 ± 17.73 (139.35–157.65)

23.93

19.21%

126.85–146.22

AV at 1RM (m·s−1)

PLA

0.325 ± 0.073 (0.29–0.36)

0.370 ± 0.125 (0.29–0.45)

0.045

12.16%

0.31–0.39

0.328

0.023*

0.354

BA

0.324 ± 0.049 (0.29–0.36)

0.426 ± 0.137 (0.35–0.50)

0.102

31.57%

0.34–0.41

PV at 1RM (m·s−1)

PLA

0.844 ± 0.222 (0.71–0.8)

0.951 ± 0.203 (0.86–1.05)

0.107

12.7%

0.80–1.00

0.802

0.044*

0.626

BA

0.881 ± 0.224 (0.76–1.00)

0.947 ± 0.113 (0.86–1.04)

0.066

7.49%

0.82–1.01

AP at 1RM (W)

PLA

392.16 ± 87.69 (342.70–441.63)

474.8 ± 104.58 (409.99–539.61)

82.64

21.07%

384.77–482.19

0.185

< 0.001*

0.056

BA

395.14 ± 78.86 (349.35–440.94)

559.70 ± 112.20 (499.71–619.70)

164.56

41.65%

432.33–522.52

PP at 1RM (W)

PLA

1159.5 ± 338.91 (939.31–1379.69)

1467.42 ± 334.48 (1297.52–1637.31)

307.92

26.56%

1136.50–1490.42

0.332

< 0.001*

0.774

BA

1258.79 ± 393.66 (1054.92–1462.64)

1599.64 ± 235.49 (1442.35–1756.94)

300.85

23.89%

1265.38–1593.05

Kg at Pmax (kg)

PLA

91.42 ± 15.73 (83.02–99.81)

106.00 ± 12.43 (97.71–114.28)

14.58

15.95%

90.90–106.52

0.896

< 0.001*

0.356

BA

90.29 ± 12.53 (82.51–98.06)

108.50 ± 15.03 (100.83–116.17)

18.21

20.17%

92.16–106.62

AV at Pmax (m·s−1)

PLA

0.735 ± 0.096 (0.69–0.78)

0.698 ± 0.072 (0.66–0.74)

− 0.037

−5.03%

0.68–0.75

0.861

0.373

0.226

BA

0.710 ± 0.054 (0.67–0.75)

0.716 ± 0.055 (0.68–0.75)

0.006

0.85%

0.68–0.74

PV at Pmax (m·s−1)

PLA

1.289 ± 0.122 (1.22–1.36)

1.246 ± 0.088 (1.19–1.30)

− 0.043

− 3.34%

1.22–1.32

0.497

0.323

0.354

BA

1.291 ± 0.102 (1.23–1.35)

1.289 ± 0.086 (1.24–1.34)

− 0.002

−0.15%

1.25–1.34

AP at Pmax (W)

PLA

654.75 ± 113.98 (586.27–723.23)

725.08 ± 106.84 (664.74–785.43)

70.33

10.74%

628.31–751.53

0.904

< 0.001*

0.034*

BA

631.21 ± 115.73 (567.82–694.61)

758.50 ± 96.33 (702.63–814.37)

127.29

20.17%

637.82–751.90

PP at Pmax (W)

PLA

1397.25 ± 245.66 (1242.88–1551.62)

1565.75 ± 146.17 (1445.86–1685.63)

168.5

12.06%

1351.76–1611.24

0.494

< 0.001*

0.137

BA

1408.43 ± 269.93 (1265.51–1551.34)

1673.57 ± 238.06 (1562.58–1784.57)

265.14

18.83%

1420.88–1661.12

Mean AV (m·s−1)

PLA

0.673 ± 0.046 (0.65–0.70)

0.705 ± 0.058 (0.68–0.73)

0.032

4.75%

0.67–0.71

0.988

< 0.005*

0.905

BA

0.674 ± 0.049 (0.65–0.70)

0.704 ± 0.033 (0.68–0.73)

0.050

5.05%

0.68–0.71

Mean AP (W)

PLA

506.73 ± 68.56 (458.34–555.21)

589.07 ± 73.10 (543.27–634.87)

82.34

16.25%

502.80–593.04

0.611

< 0.001*

0.383

BA

514.13 ± 90.68 (469.29–558.97)

612.44 ± 79.92 (570.04–654.84)

98.31

19.12%

521.51–605.06

  1. PLA Placebo, BA β-alanine supplementation, Pmax Maximun power, AP Average power, PP Peak power, AV average velocity, PV Peak velocity, 1RM one-repetition maximun, kg Kilogram, W Watts, m·s−1 m·second, * = Significant difference (p < 0.05). Data expressed as mean ± standard deviation (SD), ± 95% confidence intervals (CI)