Cameras and light fittings

For all discussions about this "lively" subject. All topics that are substantially about helmet usage will be moved here.
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Steady rider
Posts: 2749
Joined: 4 Jan 2009, 4:31pm

Cameras and light fittings

Post by Steady rider »

Cycle, June/July 2021, included a short article about helmet camera risk. Copy of a letter submitted, it is intended to inform cyclists of other research that could be worth knowing about.
Letter to Cycle
The details in ‘Helmet camera risks? ‘, were interesting and the report commissioned by the BBC, ‘Safety performance testing of climbing helmet-mounted cameras’. A word of caution may be needed in that the findings reported for rotational headform velocities and accelerations were ω: 35–43 rad/s1 and α: 5994–5859 rad/s2 respectively. It refers to other research, Mills and Gilchrist, peak rotational accelerations to be 1000–1500 rad/s2 and 4800–7500 rad/s2 and. McIntosh et al, found peak rotational accelerations were 6361 rad/s2 . It did not refer to StClaire and Chinn 2007 , who reported ‘However, for the most severe cases using a size 57cm (J) headform, rotational acceleration was typically greater than 10,000rad/s² and increased to levels of 20,000rad/s², a level at which a 35% - 50% risk of serious AIS3+ injuries is anticipated. Overall, it was concluded that for the majority of cases considered, the helmet can provide life saving protection during typical linear impacts and, in addition, the typical level of rotational acceleration observed using a helmeted headform would generally be no more injurious than expected for a bare human head. However, in both low speed linear impacts and the most severe oblique cases, linear and rotational accelerations may increase to levels corresponding to injury severities as high as AIS 2 or 3, at which a marginal increase (up to 1 AIS interval) in injury outcome may be expected for a helmeted head. The true response of the bare human head to oblique, glancing blows is not known and these observations could not be concluded with certainty, but may be indicative of possible trends’. A recent article by Moore et al reported on postconcussion syndrome (PCS) in adult cyclists, stating, ‘The mean duration of PCS for helmet wearers was 22.9 months, and 16.8 months for patients not wearing a helmet at the time of concussion (p=0.41)’. There remains uncertainty about helmet safety and adding cameras or other fixtures as rotational levels may reach critical levels.
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