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

Sports Medicine - Open

Table 2 Sensor-recorded and video-verified impact locations ≥ 20 g

		Impact from opposition (teammate)
		Head	Shoulder	Chest	Arm	Waist	Leg/knee	Ground	Total
Point of impact	Head	13^a (4,7,2)	64^b (26,37,1)	34^c (12,22,0)	199^d (120,60,19)	66^e (5,60,1)	26^f (13,13,0)	11 (6,5,0)	413 (186,204,23)
	Shoulder	0 (0,0,0)	30 (11,18,1)	29 (16,13,0)	2 (2,0,0)	13 (1,12,0)	0 (0,0,0)	10 (8,1,1)	84 (38,44,2)
	Chest	0 (0,0,0)	26 (10,16,0)	10 (2,8,0)	5^g (0,3,2)	0 (0,0,0)	0 (0,0,0)	18 (14,2,2)	59 (26,29,4)
	Arm	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	1 (1,0,0)	1 (1,0,0)
	Waist	0 (0,0,0)	3 (3,0,0)	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	0 (0,0,0)	4 (3,1,0)	7 (6,1,0)
	Total	13 (4,7,2)	123 (50,71,2)	73 (30,43,0)	206 (122,63,21)	79 (6,72,1)	26 (13,13,0)	44 (32,9,3)	564 (257,278,29)

Note: Data in the parentheses are for a hit-up, tackle and off-the-ball incident, as follows: (hit-up, tackle, off-the-ball)
^a 4 impacts from teammate’s head (3 tackle, 1 off-the-ball)
^b 7 impacts from teammate’s shoulder (tackle), 1 impact from player’s own shoulder (hit-up)
^c 6 impacts from teammate’s chest (6 tackle)
^d 32 impacts from teammate’s arm (20 tackle, 12 off-the-ball), 2 impacts from player’s own arm (2 off-the-ball)
^e 5 impacts from teammate’s waist (4 tackle, 1 off-the-ball)
^f 2 impacts from teammate’s leg/knee (2 tackle)
^g 1 impacts from teammate’s arm (off-the-ball)