Head Impact Exposure in Junior and Adult Australian Football Players

Table 3

Impacts to the head greater than 10 by injury tolerance, injury severity for resultant linear and rotational accelerations, Head Impact Telemetry Severity Profile and Risk Weighted Exposure Combined Probability for total impacts, impacts recorded by junior, senior, and total in an amateur Australian Football League team over a season of matches.

	Junior	Senior	Total
	n = (%)	n = (%)	n = (%)
Injury tolerance
>95	2 (0.2)	6 (0.8)	8 (0.5)
>5500 rad/s^2	153 (17.8)	148 (19.8)	301 (18.7)
Injury severity (linear)
<66	821 (95.4)	723 (96.7)	1,544 (96.0)
66–106	31 (3.6)	18 (2.4)	49 (3.0)
>106	9 (1.0)	7 (0.9)	16 (1.0)
Injury severity (rotational)
<4600 rad/s^2	630 (73.2)	531 (71.0)	1,161 (72.2)
4600–7900 rad/s^2	155 (18.0)	150 (20.1)	305 (19.0)
>7900 rad/s^2	76 (8.8)	67 (9.0)	143 (8.9)
<21	627 (72.8)	554 (74.1)	1,181 (73.4)
21–63	199 (23.1)	177 (23.7)	376 (23.4)
>63	(4.1)	(2.3)	52 (3.2)
<0.2500	788 (91.5)	696 (93.0)	1,484 (92.2)
0.2500–0.7500	45 (5.2)	29 (3.9)	74 (4.6)
>0.7500	28 (3.3)	23 (3.1)	51 (3.2)

Data are presented as number of impacts and percentage of impacts recorded. rad/s²: radians per second; : Head Impact Telemetry Severity Profile; : Risk Weighted Exposure Combined Probability; significant difference compared junior; senior.