Table 3.
Median [interquartile range] of peak linear acceleration (PLA; g) and peak rotational acceleration (PRA; rad/s2) between CONTROL and SHELL groups across location of measured head Impacts and gameplay characteristics.
| Variable | Factor | CONTROL (n = 547) |
SHELL (n = 421) |
||
|---|---|---|---|---|---|
| PLA | PRA | PLA | PRA | ||
| Helmet Location | Front | 25.20 [17.75] | 1805.10 [1258.54] | 24.55 [15.47] | 1605.63 [1007.14] |
| Left | 15.60 [14.25] | 1291.93 [764.70] | 18.30 [10.15] | 1434.47 [864.92] | |
| Right | 19.30 [11.30] | 1485.84 [775.80] | 19.00 [13.15] | 1395.71 [856.74] | |
| Top/Crown | 38.20 [34.45] | 883.77 [1619.75] | 28.31 [22.47] | 896.65 [887.62] | |
| Back | 19.85 [9.95] | 1254.27 [692.97] | 22.70 [10.75] | 999.38 [758.73] | |
| Observed Direction | Front | 24.80 [17.21] | 1782.04 [1234.63] | 24.11 [15.53] | 1557.53 [995.92] |
| Left | 17.25 [14.62] | 1383.78 [885.91] | 24.80 [13.31] | 1520.97 [1142.53] | |
| Right | 22.32 [12.35] | 1485.84 [938.21] | 20.61 [14.21] | 1440.92 [1043.86] | |
| Starting Stance | 2-point | 25.35 [24.45] | 1829.49 [1820.53] | 27.90 [23.52] | 2189.93 [1752.81] |
| 3-point | 23.70 [16.85] | 1642.07 [1147.51] | 23.44 [14.55] | 1487.22 [888.95] | |
| Closing Distance | ≤5 yards | 23.40 [16.93] | 1650.96 [1154.83] | 23.73 [15.15] | 1529.66 [966.23] |
| >5 yards | 36.62 [26.25] | 2889.21 [2351.35] | 30.15 [32.87] | 2336.86 [1530.25] | |
| Skill | Blocking | 22.65 [16.75] | 1677.50 [1332.35] | 29.21 [22.03] | 2251.74 [1796.01] |
| Engaging | 25.31 [18.42] | 1695.63 [1062.80] | 23.45 [15.02] | 1487.10 [891.26] | |
| Tackling | 21.50 [21.02] | 1493.91 [1442.02] | 20.92 [12.52] | 1400.58 [1528.51] | |
| Striking | Strike | 26.71 [21.05] | 1821.63 [1322.26] | 23.91 [16.15] | 1518.54 [971.27] |
| Struck | 22.35 [15.12] | 1569.63 [1168.09] | 23.80 [13.77] | 1595.56 [1109.25] | |
| Guardian Cap Impacts | None | 24.60 [17.27] | 1712.83 [1247.18] | - | - |
| Yes, 1 Player | 22.30 [10.81] | 1699.71 [1250.72] | 23.90 [15.50] | 1535.03 [1027.92] | |
| Yes, both Players | - | - | 25.85 [14.30] | 1773.37 [944.34] | |
| Play-type | Pass | 21.50 [14.00] | 1562.38 [1021.15] | 22.10 [11.71] | 1430.71 [831.45] |
| Rush | 28.60 [19.62] | 1950.49 [1427.95] | 25.35 [17.43] | 1628.56 [1145.83] | |
| Individual | 22.10 [15.35] | 1625.98 [1149.98] | 20.51 [21.22] | 1458.71 [1460.31] | |
| Inside Run | 25.90 [18.95] | 1763.53 [1556.58] | 24.90 [15.02] | 1748.84 [1295.24] | |
| 1 vs. 1 | 26.91 [19.17] | 1772.92 [1110.48] | 23.42 [15.37] | 1393.53 [653.31] | |
Abbreviations: PLA, peak linear acceleration; PRA, peak rotational acceleration.