Head Impact Exposure in Junior and Adult Australian Football Players
Table 2
Impacts to the head greater than 10 by impact location for total impacts, impacts recorded by junior and senior players in an amateur Australian Football League team over a season of matches.
Location
%
Duration ms ± SD
PLA ()
PRA (rad/s2)
Median [IQR]
0.95
Median [IQR]
0.95
Median [IQR]
0.95
Median [IQR]
0.95
Total
Front
35.0
11.0 ± 7.6
16.2 [12.2–24.6]
44.8
[2,050.0–5,212.4]
9,684.3
[13.0–21.4]
39.2
[0.0004–0.0085]
0.5046
Back
22.9
15.5 [11.7–23.5]
42.4
2,705.7 [1,343.1–4,873.5]
8,832.4
14.6 [11.5–23.0]
46.0
0.0007 [0.0002–0.0065]
0.2269
Side
37.4
14.9 [11.8–21.9]
51.3
[1,517.6–4,294.6]
9,728.9
15.4 [13.6–20.2]
42.3
[0.0002–0.0037]
0.4449
Top
4.7
13.0 ± 10.2
16.0 [11.8–22.1]
48.2
[1,469.0–4,458.2]
11,139.3
[12.5–19.4]
53.6
[0.0002–0.0042]
0.7728
Juniors
Front
37.9
10.8 ± 7.3
15.8 [12.1–23.9]
44.0
[2,062.2–5,213.4]
9,640.6
14.6 [11.4–20.7]
48.0
[0.0004–0.0079]
0.5156
Back
25.0
10.2 ± 7.8
15.5 [11.8–22.9]
40.3
[1,348.7–4,653.7]
8,839.1
14.5 [12.0–23.2]
47.1
[0.0002–0.0047]
0.2247
Side
32.2
10.0 ± 7.1
14.2 [11.8–20.5]
49.1
[1,527.0–3,944.1]
10,267.7
15.4 [13.5–19.9]
45.1
[0.0002–0.0027]
0.5151
Top
5.0
11.4 ± 9.9
16.1 [11.7–21.1]
44.0
2,302.9 [1,562.9–3,823.5]
10,491.6
15.6 [12.9–19.2]
47.9
0.0005 [0.0003–0.0021]
0.5334
Seniors
Front
31.7
15.2 [11.7–22.8]
46.0
2,334.9 [1,481.9–4,363.1]
10,158.3
15.3 [13.4–20.4]
35.6
0.0005 [0.0002–0.0039]
0.5140
Back
20.5
15.3 [11.7–24.6]
43.3
2,711.6 [1,302.2–5,187.3]
8,841.5
14.2 [10.5–23.4]
46.3
0.0008 [0.0002–0.0080]
0.2271
Side
43.4
12.0 ± 8.7
14.6 [11.6–20.7]
53.2
2,198.3 [1,441.5–4,061.1]
9,028.1
14.9 [13.3–18.8]
40.4
0.0005 [0.0002–0.0029]
0.3909
Top
4.4
16.0 [12.2–32.8]
58.0
2,760.9 [1,110.3–4,916.3]
12,029.2
13.5 [11.8–23.9]
67.8
0.0008 [0.0002–0.0105]
0.9019
Data are presented as mean (±SD) for impact duration (ms) and median [IQR] and 95th percentile for total impacts, juniors, seniors, resultant linear, and rotational acceleration, Head Impact Telemetry Severity Profile, and Risk Weighted Exposure Combined Probability. IQR: = interquartile (25th to 75th) percentile; 95%: = 95th percentile; PLA (): peak linear acceleration in gravitational force (); PRA (rad/s2): = peak rotational acceleration in radians per second; : = Head Impact Telemetry Severity Profile; : = Risk Weighted Exposure Combined Probability; significant difference compared to junior; senior; front; back; side; top.
