| 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 |
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| ABSTRACT |
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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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Corresponding Author.
Yasuhiro Matsui , Email. 
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