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International Journal of Automotive Technology > Volume 19(6); 2018 > Article
International Journal of Automotive Technology 2018;19(6): 1023-1032.
REDUCTION IN THE HEAD INJURY LEVEL DUE TO JUNIOR HIGH SCHOOL CYCLISTS WEARING HELMETS
Yasuhiro Matsui1, Shoko Oikawa2
1National Traffic Safety and Environment Laboratory
2Tokyo Metropolitan University
PDF Links Corresponding Author.  Yasuhiro Matsui , Email. ymatsui@ntsel.go.jp
ABSTRACT
We assessed the effect of wearing a junior-high-school helmet when the frontal or lateral part of a helmet impacted the upper part and lower part of the A-pillar of a vehicle at 35 km/h (212 J). The head injury criterions (HICs) of the headform impactor without a helmet were respectively 4530 and 4937. In the case of the headform impactor wearing a junior-high-school helmet, the helmet reduced the HIC by 17.5 % and 9.9 % for impacts of the frontal part of the helmet and by 15.0 % and 4.0 % for impacts of the lateral part of the helmet. We also assessed the effect of wearing a junior-high-school helmet when the frontal part of the helmet impacted a road surface from a height of 1.5 m (66 J). The HIC of the headform impactor without a helmet was 6525. The HIC was reduced by 82.7 % when wearing a junior-high-school helmet. Both experiments show that, under a relatively low impact energy condition such as a road surface impact, wearing a junior-highschool helmet greatly reduces the head injury level. Meanwhile, under a relatively high-impact-energy condition such as impact against an A-pillar, wearing a junior-high-school helmet is ineffective in reducing the head injury level.
Key Words: Junior-high-school helmet, Cyclist, Head injury, A-pillar impact, Road surface impact
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