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• W2617744089 abstract "Equipping athletes with properly fitted helmets is purported to ensure devices are performing to manufacturer’s product claims. Traditional methods of verifying product safety claims are based on linear acceleration measures. A more recent measure, the Summation of Tests for the Analysis of Risk (STAR) rating system, also incorporates linear acceleration weighted at each location by on-field season exposure. However, little research is available linking the influence proper fit may have on the helmet’s ability to mitigate impact energy. PURPOSE: To investigate whether helmet fit, adjusted by jaw pad thickness, affects an American football helmet’s ability to mitigate linear acceleration measures (peak g, STAR). METHODS: The fit of nine, new, size large, widely used make and model helmets (3 STAR rated), was manipulated using jaw pads of three different thicknesses (S = 1.65, M = 2.4, and L = 3.5cm). Helmets were fit to a medium National Operating Committee on Standards for Athletic Equipment (NOCSAE) headform and then impacted per guidelines detailed in the STAR rating system. Helmets were impacted twice at 4 locations (front, rear, side, top), and 5 drop heights (0.31, 0.61, 0.91, 1.22, 1.52m). Linear acceleration in the three cardinal planes was measured with a triaxial accelerometer mounted in the center of gravity of the headform (sampling rate 20 kHz). A three-way (thickness x height x location) ANOVA with repeated measures was used to test for differences in vector resultant linear peak g accelerations (α = 0.05). RESULTS: Statistical differences in resultant linear peak g by location (F3,45 = 43.2, p <0.01, ƒ = 3.34), drop height (F1.76,60 =2720.85, p <0.01, ƒ = 19.5), and location*height (F3.9,51 = 27.97, p <0.01, ƒ = 2.31) were found. There were no statistical differences for thicknesses (Means ± SD, S = 75.15 ± 23.22, M = 76.75 ± 22.58, L = 78.39 ± 23.51g, p=0.068), height*thickness (p = 0.058), or location*thickness (p =.124). STAR values were calculated to be S = 0.43 (3 STAR), M = 0.47 (3 STAR), and L = 0.52 (2 STAR). CONCLUSIONS: Jaw pad thickness had no influence on linear acceleration measures. However, application of the thickest jaw pad in our test set-up resulted in a reduction of the advertised STAR rating, from 3 to 2 STARS (Good, Adequate respectively)." @default.
• W2617744089 created "2017-06-05" @default.
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• W2617744089 date "2017-05-01" @default.
• W2617744089 modified "2023-09-27" @default.
• W2617744089 title "Effect of Jaw Pad Thickness on American Football Helmet Performance" @default.
• W2617744089 doi "https://doi.org/10.1249/01.mss.0000517896.21693.57" @default.
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