Table 2.

Training effects (with 95% confidence limits) for the jump performance variables for the control group (CONTROL, n = 9), plyometric training group receiving placebo (PLACEBO, n = 8) and plyometric training group receiving beta-alanine supplementation (BA, n = 8).

	Baseline Mean ± SD	Post Mean ± SD	Change (%)	Effect sizes
Peak jump power (W)
CONTROL	2003 ± 341	1989 ± 272	0.0 (-5.7, 5.7)	0.01 (-0.29, 0.27)
PLACEBO	1974 ± 259	2140 ± 250	8.6 (5.2, 12.0)bc	0.59 (0.41, 0.76)
BA	1944 ± 340	2122±318	9.6 (5.6, 13.5)bc	0.54 (0.36, 0.71)
Squat jump (cm)
CONTROL	25.4 ± 5.3	25.5 ± 4.9	0.8 (-1.6, 3.1)	0.04 (-0.05, 0.12)
PLACEBO	23.4 ± 2.4	25.0 ± 2.9	5.9 (3.0, 8.8)bc	0.46 (0.28, 0.64)
BA	25.4 ± 5.2	27.0 ± 5.5	6.1 (4.0, 8.1)bc	0.27 (0.20, 0.34)
Countermovement jump (cm)
CONTROL	28.9 ± 5.8	29.4 ± 6.3	1.6 (-1.1, 4.3)	0.07 (-0.03, 0.16)
PLACEBO	24.8 ± 3.4	26.4 ± 3.0	8.7 (4.4, 12.9)bc	0.56 (0.35, 0.76)
BA	28.1 ± 3.5	30.6 ± 3.1	9.3 (6.1, 12.5)bc	0.68 (0.50, 0.87)
40 cm reactive strength index (mm.ms-1)
CONTROL	1.33 ± 0.3	1.33 ± 0.5	-2.0 (-20.7, 16.7)	-0.12 (-0.52, 0.28)
PLACEBO	1.24 ± 0.4	1.67 ± 0.6	36.6 (13.4,+59.8)bc	0.74 (0.41, 1.08)
BA	1.11 ± 0.2	1.53 ± 0.5	36.8 (18.3, 55.2)bc	1.00 (0.67, 1.34)
60 s countermovement jump power (W.kg-1)
CONTROL	15.3 ± 0.7	15.4 ± 0.8	0.9 (-0.2, 1.9)	0.16 (0.0, 0.31)
PLACEBO	15.1 ± 0.7	15.3 ± 0.7	1.7 (1.0, 2.4)a	0.32 (0.21, 0.43)
BA	14.8 ± 1.0	15.3 ± 1.1	3.6 (2.3, 4.9)bcd	0.45 (0.32, 0.58)e

^bdenote significant change pre to post training (p < 0.05 and p < 0.01, respectively).

^cdenotes greater change compared to CONTROL (p < 0.05);

^adenote significant change pre to post training (p < 0.05 and p < 0.01, respectively).

^ddenotes greater change compared to PLACEBO (p < 0.05);

^edenotes small meaningfully greater effect compared to PLACEBO.