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

José Luis Maté-Muñoz; Juan H. Lougedo; Manuel V. Garnacho-Castaño; Pablo Veiga-Herreros; María del Carmen Lozano-Estevan; Pablo García-Fernández; Fernando de Jesús; Jesús Guodemar-Pérez; Alejandro F. San Juan; Raúl Domínguez

doi:10.1186/s12970-018-0224-0

Journal of the International Society of Sports Nutrition

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*
Kg at 1RM (kg)	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	0.484	< 0.001*	0.014*
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
AV at 1RM (m·s⁻¹)	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	0.328	0.023*	0.354
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
PV at 1RM (m·s⁻¹)	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	0.802	0.044*	0.626
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
AP at 1RM (W)	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	0.185	< 0.001*	0.056
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
PP at 1RM (W)	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	0.332	< 0.001*	0.774
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
Kg at Pmax (kg)	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	0.896	< 0.001*	0.356
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
AV at Pmax (m·s⁻¹)	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	0.861	0.373	0.226
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
PV at Pmax (m·s⁻¹)	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	0.497	0.323	0.354
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*
AP at Pmax (W)	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	0.904	< 0.001*	0.034*
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
PP at Pmax (W)	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	0.494	< 0.001*	0.137
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
Mean AV (m·s⁻¹)	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	0.988	< 0.005*	0.905
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
Mean AP (W)	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	0.611	< 0.001*	0.383

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)

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