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Table 1 Cross-tabulation of frequency of verified in-game impacts ≥ 20g measured by the X-patchTM

From: Video Analysis and Verification of Direct Head Impacts Recorded by Wearable Sensors in Junior Rugby League Players

 

Playing position

Player time in game (min)

All X-patchTM-recorded impacts during game time

X-patchTM-recorded direct impacts

Sensor-recorded in-game impacts

Video verified game impacts

Percentage of impacts verified (%)

Video verified impacts per game hour

Video verified direct impacts

Video verified direct impacts per game hour

Player 1

Back

211

17

16

94.1

4.5

12

3.4

Player 2

Back

337

22

22

100

3.9

17

3.0

Player 3

Back

490

46

44

95.7

5.4

30

3.7

Player 4

Back

463

36

36

100

4.7

24

3.1

Player 5

Back

300

14

14

100

2.8

9

1.8

Player 6

Back

390

15

15

100

2.3

10

1.5

 

Forward

30

2

2

100

4

1

2

Player 7

Forward

259

26

25

96.2

5.8

14

3.2

Player 8

Forward

192

39

35

89.7

10.9

22

6.9

Player 9

Forward

204

67

56

83.6

16.5

44

12.9

Player 10

Forward

398

37

37

100

5.6

31

4.7

Player 11

Forward

272

25

25

100

5.5

20

4.4

Player 12

Forward

247

63

63

100

15.3

45

10.9

Player 13

Back

87

12

11

91.7

7.6

8

5.5

 

Forward

63

10

8

80

7.6

7

6.7

Player 14

Forward

118

24

16

66.7

8.1

13

6.6

Player 15

Forward

91

30

26

86.7

17.1

20

13.2

Player 16

Forward

185

62

47

75.8

15.2

37

12

Player 17

Back

180

20

18

90

6

12

4

Player 18

Forward

36

9

8

88.9

13.3

3

5

Player 19

Forward

72

12

11

91.7

9.2

9

7.5

Player 20

Forward

56

26

21

80.8

22.5

17

18.2

Player 21

Back

21

1

0

0

0

0

0

 

Forward

60

9

8

88.9

8

7

7

Total

4762

624

564

90.4

7.1

413

5.2

  1. Note: Season totals. Players 6, 13, and 21 played in both forward and back positions during the season. Sensor-recorded impacts were ≥ 20gs