Related Experiment Videos
Bicycle helmet ventilation and comfort angle dependence
Paul A Brühwiler1, Charline Ducas, Roman Huber
1Swiss Federal Laboratories for Materials Testing and Research (EMPA), Lerchenfeldstrasse 5, 9014 St Gallen, Switzerland. Paul.Bruehwiler@empa.ch
European Journal of Applied Physiology
|May 13, 2004
Summary
Bicycle helmet ventilation varies significantly, with head angle impacting cooling power. Angling the head forward improved skull cooling by up to 25% in tested helmets, confirmed by human subject studies.
Area of Science:
- Sports Engineering
- Biomechanics
- Thermal Physiology
Background:
- Bicycle helmets are crucial safety equipment.
- Ventilation is a key factor in helmet comfort and performance.
- Understanding ventilation variations is important for design improvements.
Purpose of the Study:
- To quantify ventilation performance differences among modern bicycle helmets.
- To investigate the influence of wind speed and head angle on helmet cooling power.
- To compare manikin headform results with human subject data.
Main Methods:
- Utilized a heated manikin headform and seven human subjects.
- Measured steady-state heat exchange (cooling power) under varied wind speeds and head angles.
- Compared helmet cooling power to that of a nude headform.
Main Results:
- Cooling power varied from 60% to over 90% of the nude headform across different helmets.
- Angling the head 30 degrees forward increased skull cooling power by up to 25% for some helmets.
- Manikin headform results were strongly supported by human subject comparisons.
Conclusions:
- Significant variations exist in the ventilation performance of current bicycle helmets.
- Head angle is a critical factor influencing helmet cooling efficiency.
- The manikin headform is a reliable tool for assessing bicycle helmet ventilation.