News Release

Long working days with too few hours' sleep slow responses as much as alcohol

Peer-Reviewed Publication

Center for Advancing Health

After 17 to 19 hours of staying awake -- a normal working day for many people -- reaction times are up to 50 percent slower than they are after drinking alcohol, shows research in Occupational and Environmental Medicine. The research focused on legally accepted limits for alcohol in Scandinavia, of 50 mg/dl; in the UK this is almost twice as high at 80 mg/dl.

Mental and physical reaction times, accuracy, coordination and attention span were tested using a range of manual and cognitive tasks in 39 people in their 30s and 40s. The tests were carried out over a period of 28 hours during which the volunteers were given alcohol up to a maximum of 100 mg/dl. And after a night's sleep, the tests were repeated over the same time frame without alcohol. All those assessed worked in transport.

The results showed that after staying awake for 17 to 19 hours -- a normal working day for many people -- performance of some tasks was the same or worse than after 50mg/dl of alcohol. Reaction times were up to 50 per cent slower, and accuracy was significantly poorer. The longer the volunteers stayed awake, the worse they performed, reaching levels normally expected from alcohol intake above the legally accepted limit in Scandinavia and the UK.

The authors note that lowest performance levels did not parallel the sleep-wake cycle that occurs as a result of the body's natural biorhythms (circadian rhythms). And they suggest that this is because it is sleep deprivation rather than dips in the natural cycles that most strongly impair performance, but that the effects are likely to be exaggerated by these rhythms.

The effects of fatigue are thought to play a part in almost two-thirds of the road accidents in the United States, say the authors. Extended working hours, shift work, and lifestyle choices are likely to decrease the amounts of sleep we have, they conclude. The effects, which are likely to be cumulative, pose a serious risk to safety, they say.

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[Moderate sleep deprivation produces impairments in cognitive and motor performance equivalent to legally prescribed levels of alcohol intoxication. Occupational and Environmental Medicine, 2000; 57: 649-55

For further information about Occupational and Environmental Medicine or to obtain a copy of the article, please contact Public Affairs Division, British Medical Association, BMA House, Tavistock Square, London WC1H 9JP, Tel: 020 7383 6254 or email: pressoffice@bma.org.uk. After 6 p.m. and on weekends telephone: +44 (0)208 241 6386 / +44 (0)208 997 3653/+44 (0)208 674 6294 / +44 (0)1525 379792 / +44 (0)208 651 5130.

Posted by the Center for the Advancement of Health <http://www.cfah.org>. For information about the Center, call Petrina Chong, <pchong@cfah.org> (202) 387-2829.

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