Table 2. Impacts to the head greater than 10g in youth Australian Football players by impact location for resultant peak linear and rotational accelerations, head impact telemetry severity profile and risk weighted exposure combined (linear and rotational) probability for number of impacts recorded, impact duration and impact magnitude. Data are presented as mean (± standard deviation) and median [25th to 75th interquartile range]. |
Impact Location |
Impact to the head |
Peak Linear Acceleration (PLA(g)) |
Peak Rotational Acceleration (PRA(deg/s2)) |
Head Impact Telemetry severity profile (HITSP) |
Risk Weighted Exposure combined probability (RWECP) |
|
Impact Duration (ms) |
|
|
N = (%) |
Mean ±SD |
Median [IQR] |
95% |
Median [IQR] |
95% |
Median [IQR] |
95% |
Median [IQR] |
95% |
Total |
Front |
112 (24.7) |
11.0 ±7.5bcd |
17.9 [13.6-25.9]cd |
46.3 |
220,635 [141,624-360,729] |
664,929 |
17.2 [13.6-23.3]c |
48.7 |
.0003 [.0006-.0180]bc |
.82 |
Back |
117 (25.8) |
8.5 ±6.2ad |
14.6 [11.4-24.9]cd |
48.6 |
192,909 [77,229-313,877.7] |
889,294 |
14.1 [11.4-22.2]c |
46.5 |
.0014 [.0002-.0166]a |
.93 |
Side |
201 (44.4) |
10.2 ±8.4a |
14.2 [11.6-22.6]abd |
44.1 |
155,650 [86,557-242,642] |
514,356 |
14.2 [12.3-20.1]ab |
49.8 |
.0007 [.0002-.0038]a |
.31 |
Top |
23 (5.1) |
11.5±9.1ab |
14.1 [13.1-19.1]abc |
40.8 |
206,053 [122,017-315,648] |
600,477 |
14.3 [13.3-19.7] |
46.4 |
.0015 [.0005-.0112] |
.53 |
Injured |
Front |
8 (30.8 |
11.1 ±9.7 |
15.3 [11.1-18.4 |
- |
151,926 [131,924-201,292] |
- |
14.5 [11.3-16.4] |
- |
.0006 [.0006-.0016] |
- |
Back |
6 (23.1) |
4.8 ±3.1 |
12.4 [12.1-13.4] |
- |
222,606 [211,341-272,682] |
- |
12.6 [11.3-13.9] |
- |
.0019 [.0014-.0046] |
- |
Side |
10 (38.5) |
10.3 ±5.3 |
15.4 [12.3-25.1] |
- |
166,261 [82,552-346,628] |
- |
13.8 [12.1-23.7] |
- |
.0009 [.0003-.0097] |
- |
Top |
2 (7.7) |
9.0 ±5.7 |
15.0 [14.2-15.9] |
- |
350,198 [278,125-422,270] |
- |
17.5 [15.9-19.1] |
- |
.0565 [.0290-.0840] |
- |
Non-Injured |
Front |
104 (24.4) |
11.0 ±7.3bcd |
18.4 [13.7-26.9]bcd |
45.9 |
226,846 [144,723-368,859] |
669,186 |
17.5 [13.7-25.1]bc |
49.8 |
.0032 [.0006-.0224]bc |
.83 |
Back |
111 (26.0) |
8.7 ±6.2ad |
15.1 [11.3-26.0]acd |
49.2 |
184,664 [76,152-328,884] |
739,763 |
14.6 [11.4-22.3]ac |
47.9 |
.0012 [.0002-.0168]a |
.92 |
Side |
191 (44.7) |
10.2 ±8.5ad |
14.2 [11.6-22.1]adb |
43.3 |
155,174 [87,496-242,132] |
500,502 |
14.2 [12.3-20.0]ab |
47.6 |
.0007 [.0002-.0037]ad |
.44 |
Top |
21 (4.9) |
11.7 ±9.4abc |
14.1 [13.0-19.9]abc |
41.5 |
201,171 [118,608-303,324] |
621,762 |
14.3 [13.3-18.7] |
47.9 |
.0014 [.0005-.0082]c |
.55 |
|
SD = Standard Deviation; ms = milliseconds; IQR = interquartile [25th-75th] percentile; 95th = 95th percentile; Significant difference (p < 0.05) than (a) = Front, (b) = Back; (c) = Side; (d) = Top |
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