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Table 4 Effects of balance and plyometric training (BTPT) on measures of physical performance in youth soccer players by intervention group

From: Effects of a blocked versus an alternated sequence of balance and plyometric training on physical performance in youth soccer players

Variables

Blocked BTPT (n = 8)

Alternated BTPT (n = 9)

p-value (Cohen’s d)

Pre

Post

∆%a

Pre

Post

∆%a

Test

Test x Group

Group

Balance

 AT-ND [% LL]

65.9 ± 8.2

67.4 ± 4.4

2.3

72.7 ± 11.1

73.0 ± 10.7

0.4

.418 (.39)

.563 (.29)

.142 (.75)

 PM-ND [% LL]

99.8 ± 3.4

105.6 ± 6.8

5.8

104.3 ± 7.5

106.0 ± 8.2

1.6

.006 (1.54)

.101 (.84)

.400 (.42)

 PL-ND [% LL]

97.1 ± 5.3

104.3 ± 5.4

7.4

103.1 ± 9.3

105.4 ± 11.1

2.2

.002 (1.78)

.076 (.92)

.339 (.48)

 CS-ND [% LL]

86.5 ± 7.5

91.2 ± 7.9

5.4

95.1 ± 16.3

96.6 ± 17.0

1.6

.002 (1.81)

.067 (.95)

.257 (.57)

 AT-D [% LL]

66.0 ± 5.9

66.0 ± 5.7

0

70.3 ± 9.8

73.0 ± 11.1

3.8

.344 (.49)

.343 (.49)

.172 (.71)

 PM-D [% LL]

99.9 ± 4.4

106.4 ± 9.3

6.5

103.4 ± 7.7

106.8 ± 11.2

3.3

.014 (1.38)

.425 (.41)

.604 (.26)

 PL-D [% LL]

97.9 ± 7.1

104.6 ± 10.8

6.8

100.7 ± 8.1

107.3 ± 14.6

6.6

.009 (1.48)

.984 (.01)

.557 (.30)

 CS-D [% LL]

86.5 ± 7.4

90.8 ± 9.7

5.0

93.1 ± 15.4

97.7 ± 20.3

4.9

.014 (1.38)

.929 (.06)

.334 (.50)

Muscle power

 SJ height [cm]

24.5 ± 3.3

26.7 ± 3.6

9.0

25.0 ± 3.9

25.3 ± 3.6

1.2

.029 (1.36)

.098 (.99)

.803 (.14)

 CMJ height [cm]

25.5 ± 3.6

28.1 ± 3.4

10.2

26.2 ± 4.3

28.1 ± 3.3

7.3

.002 (2.21)

.573 (.32)

.857 (.11)

 DJ height [cm]

22.0 ± 3.9

27.0 ± 3.6

22.7

23.7 ± 1.5

25.9 ± 3.2

9.3

.004 (1.96)

.209 (.74)

.807 (.14)

Speed

 0–5 m time [s]

1.21 ± 0.05

1.14 ± 0.07

5.8

1.21 ± 0.10

1.12 ± 0.03

7.4

.001 (2.02)

.538 (.33)

680 (.22)

 0–10 m time [s]

2.04 ± 0.06

1.94 ± 0.09

4.9

2.02 ± 0.12

1.88 ± 0.06

6.9

<.001 (3.08)

.331 (.52)

.309 (.54)

 0–15 m time [s]

2.77 ± 0.08

2.66 ± 0.13

4.0

2.75 ± 0.16

2.60 ± 0.09

5.5

<.001 (2.66)

.431 (.42)

.441 (.41)

Agility

 T test time [s]

10.67 ± 0.53

10.07 ± 0.39

5.6

10.46 ± 0.46

9.99 ± 0.32

4.5

<.001 (3.80)

.396 (.45)

.462 (.39)

  1. Values are mean values ± standard deviations. aPositive values indicate performance improvements. Figures in brackets are effect sizes (Cohen’s d) with 0 ≤ d ≤ 0.49 indicating small, 0.50 ≤ d ≤ 0.79 medium, and d ≥ 0.80 large effects. AT anterior, CS composite score, CMJ countermovement jump, D dominant leg (i.e., kicking leg), DJ drop jump, LL leg length, ND non-dominant leg (i.e., stance leg), PL posterolateral, PM posteromedial, SJ squat jump