
How quickly does drinking impair motor skills?
Public advocacy organization Mothers Against Drunk Driving (MADD) has assembled an informative chart based on information gathered from a variety of sources including the National Highway Traffic Safety Administration, the National Institute on Alcohol Abuse and Alcoholism, the American Medical Association, the National Commission Against Drunk Driving, and www.webMD.com. The purpose of this chart is to provide readers with an idea of the ways in which the motor controls of a person who is drinking will be impeded as his or her blood alcohol concentration (BAC) increases. A person’s BAC depends on several factors, including weight and gender, the percentage of alcohol content of the drink consumed, the volume of alcohol consumed and the amount of time spent drinking. As an example, a 170-pound man who drinks 2 beers over the course of an hour will probably have a BAC of just under .05 percent.- At .02 percent the person will experience relaxation and a decline in the visual functions involved in tracking moving objects
- At .05 percent the person loses some degree of the small muscle control involved in focusing the eyes, along with a reduced ability to track moving objects and respond to an emergency situation
- At .08 percent the person will suffer from poor muscle coordination, with impairment or disruption of balance, speech, vision, reaction time, and hearing
- At .10 percent there will be a clear deterioration of reaction time and control, along with slurred speech and poor physical coordination
- At .15 percent the person will possess far less muscle control than he or she normally does, along with a major loss of balance and substantial overall impairment
Source: http://www.madd.org/drunk-driving/about/understanding-08.html