Table 3 Electromyography results for control group and plyometric group (mean ± SD).

From: Effects of a 4-week plyometric training on activity patterns during different phases of one-leg drop jump with focus on jump height

Muscle

Variable

Phases

Control group

Plyometric group

Univariate ANCOVA

Pre-test

Post-test

Pre-test

Post-test

Pre-test

Phases

Group

Phases × Group

F

p

F

p

F

p

F

p

Rector femoris

Signal amplitude (μv)

PR

10.73 ± 12.00

5.34 ± 5.36

4.80 ± 6.58

5.94 ± 6.25

0.46

0.49

3.86

0.03*

0.04

0.84

0.18

0.84

CO

26.75 ± 25.70

13.11 ± 7.10

9.88 ± 8.60

12.50 ± 14.63

FL

36.41 ± 30.82

19.61 ± 9.31

13.82 ± 10.55

18.82 ± 24.33

Maximum activity (μv)

PR

56.1 ± 38.82

64.9 ± 50.83

55.80 ± 40.86

57.80 ± 41.02

8.84

0.000**

1.32

0.27

0.94

0.33

0.41

0.66

CO

170.6 ± 111.63

164.5 ± 127.99

152.0 ± 97.59

141.1 ± 13.09

FL

196.1 ± 118.49

241.2 ± 191.54

183.6 ± 95.60

166.6 ± 19.08

Time to peak (s)

PR

0.194 ± 0.10

0.216 ± 0.07

0.187 ± 0.10

0.153 ± 0.09

20.02

0.16

5.9

0.000**

0.17

0.68

3.73

0.03*

CO

0.231 ± 0.05

0.213 ± 0.07

0.233 ± 0.09

0.268 ± 0.07

FL

0.169 ± 0.08

0.135 ± 0.07

0.221 ± 0.07

0.176 ± 0.07

Biceps femoris

Signal amplitude (μv)

PR

2.44 ± 1.80

4.10 ± 4.1

2.65 ± 2.16

3.1 ± 1.74

3.11

0.08

3.99

0.000**

7.75

0.000**

1.24

0.29

CO

6.82 ± 3.59

10.98 ± 7.00

5.73 ± 4.00

6.27 ± 4.13

FL

10.00 ± 5.45

15.41 ± 9.48

8.0 ± 5.37

8.0 ± 4.30

Maximum activity (μv)

PR

46.0 ± 42.35

51.5 ± 40.77

46.0 ± 29.97

59.1 ± 41.81

3.93

0.05*

12.39

0.000**

1.64

0.20

0.92

0.41

CO

100.1 ± 48.76

118.7 ± 45.40

79.6 ± 34.13

99.2 ± 52.68

FL

119.0 ± 60.13

131.9 ± 51.90

103.1 ± 41.88

107.3 ± 54.91

Time to peak (s)

PR

0.228 ± 0.05

0.216 ± 0.06

0.201 ± 0.07

0.165 ± 0.10

3.41

0.07

4.35

0.01*

0.28

0.59

1.43

0.24

CO

0.233 ± 0.05

0.207 ± 0.09

0.247 ± 0.08

0.25 ± 0.08

FL

0.142 ± 0.10

0.133 ± 0.09

0.199 ± 0.09

0.119 ± 0.09

Tibialis anterior

Signal amplitude (μv)

PR

11.24 ± 7.00

13.77 ± 15.19

5.97 ± 7.73

4.45 ± 2.66

10.93

0.000**

0.18

0.83

4.90

0.03*

0.20

0.82

CO

16.28 ± 12.78

13.36 ± 12.28

6.0 ± 8.0

12.50 ± 14.63

FL

16.94 ± 15.0

12.76 ± 10.12

4.34 ± 3.16

4.24 ± 4.69

Maximum activity (μv)

PR

216.3 ± 110.36

169.5 ± 92.44

215.2 ± 15.8

164.1 ± 134.0

16.05

0.000**

0.05

0.95

0.73

0.39

0.12

0.89

CO

259.9 ± 105.35

210.6 ± 113.35

212.4 ± 151.7

160.6 ± 115.4

FL

246.6 ± 88.16

201.2 ± 130.72

167.9 ± 108.9

133.0 ± 78.08

Time to peak (s)

PR

0.199 ± 0.09

0.184 ± 0.09

0.183 ± 0.06

0.117 ± 0.10

1.7

0.25

0.42

0.65

0.05

0.83

1.33

0.27

CO

0.200 ± 0.10

0.115 ± 0.12

0.085 ± 0.10

0.121 ± 0.10

FL

0.064 ± 0.08

0.086 ± 0.10

0.149 ± 0.10

0.105 ± 0.08

Medial gastrocnemius

Signal amplitude (μv)

PR

7.87 ± 14.4

4.61 ± 8.9

1.04 ± 0.55

1.66 ± 0.66

5.32

0.03*

0.80

0.45

0.65

0.42

0.04

0.96

CO

13.48 ± 17.61

8.51 ± 12.37

2.49 ± 1.42

3.99 ± 3.49

FL

14.82 ± 14.89

10.45 ± 14.63

3.38 ± 2.0

4.93 ± 4.29

Maximum activity (μv)

PR

105.0 ± 63.01

205.7 ± 167.8

127.5 ± 122.3

147.8 ± 118.9

0.34

0.56

5.58

0.000**

5.56

0.02*

0.18

0.83

CO

215.7 ± 83.12

342.6 ± 145.89

236.1 ± 175.3

245.6 ± 121.0

FL

243.5 ± 105.07

374.2 ± 159.28

256.5 ± 188.6

265.4 ± 121.5

Time to peak (s)

PR

0.154 ± 0.10

0.185 ± 0.09

0.155 ± 0.10

0.151 ± 0.11

0.56

0.46

4.21

0.02*

0.03

0.86

0.38

0.68

CO

0.141 ± 0.04

0.230 ± 0.07

0.250 ± 0.08

0.250 ± 0.10

FL

0.141 ± 0.10

0.136 ± 0.11

0.214 ± 0.05

0.150 ± 0.10

  1. *P < 0.05, **P < 0.01.
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