In-Car Nocturnal Blue Light Exposure Improves Motorway Driving: A Randomized Controlled Trial

Jacques Taillard, Aurore Capelli, Patricia Sagaspe, Anna Anund, Torbjorn Akerstedt, Pierre Philip
PLoS ONE. 2012-10-19; 7(10): e46750
DOI: 10.1371/journal.pone.0046750

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1. PLoS One. 2012;7(10):e46750. doi: 10.1371/journal.pone.0046750. Epub 2012 Oct 19.

In-car nocturnal blue light exposure improves motorway driving: a randomized
controlled trial.

Taillard J(1), Capelli A, Sagaspe P, Anund A, Akerstedt T, Philip P.

Author information:
(1)University of Bordeaux, Sommeil, Attention et Neuropsychiatrie, USR 3413,
Bordeaux, France.

Prolonged wakefulness greatly decreases nocturnal driving performance. The
development of in-car countermeasures is a future challenge to prevent
sleep-related accidents. The aim of this study is to determine whether continuous
exposure to monochromatic light in the short wavelengths (blue light), placed on
the dashboard, improves night-time driving performance. In this randomized,
double-blind, placebo-controlled, cross-over study, 48 healthy male participants
(aged 20-50 years) drove 400 km (250 miles) on motorway during night-time. They
randomly and consecutively received either continuous blue light exposure
(GOLite, Philips, 468 nm) during driving or 2*200 mg of caffeine or placebo of
caffeine before and during the break. Treatments were separated by at least 1
week. The outcomes were number of inappropriate line crossings (ILC) and mean
standard deviation of the lateral position (SDLP). Eight participants (17%)
complained about dazzle during blue light exposure and were removed from the
analysis. Results from the 40 remaining participants (mean age ± SD: 32.9±11.1)
showed that countermeasures reduced the number of inappropriate line crossings
(ILC) (F(2,91.11) = 6.64; p

Auteurs Bordeaux Neurocampus