Abstract
Five modern bicycle helmets were studied to elucidate some of the variations in ventilation performance, using both a heated manikin headform and human subjects (n=7). Wind speed and head angle were varied to test their influence on the measured steady-state heat exchange (cooling power) in the skull section of the headform. The cooling power transmitted by the helmets varied from about 60% to over 90% of that of the nude headform, illustrating the range of present manufacturer designs. Angling the head forward by 30° was found to provide better cooling power to the skull (up to 25%) for three of the helmets and almost equal cooling power in the remaining two cases. Comparisons of skull ventilation at these angles with human subjects strongly supported the headform results.
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Acknowledgements
We gratefully acknowledge the enthusiastic participation of the subjects in this study, B. Wüst for setting up subject tests, and M. Weder, M. Richards, R. Rossi, and G. Havenith for helpful discussions.
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Brühwiler, P.A., Ducas, C., Huber, R. et al. Bicycle helmet ventilation and comfort angle dependence. Eur J Appl Physiol 92, 698–701 (2004). https://doi.org/10.1007/s00421-004-1114-5
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DOI: https://doi.org/10.1007/s00421-004-1114-5