Alcohol affects people in different amounts, under different conditions and in various ways and, in moderation, may not affect you at all. But there are a number of common side effects that may impede your running performance, says the Running Times website.
Dehydration
According to the British Broadcasting Corporation Sport website, running causes dehydration, primarily through heavy breathing and sweat. This can limit your performance -- in fact, losing 1 percent of fluid can equate to a 3 percent reduction in running performance, says Running Times. Since alcohol also causes dehydration, starting a run with a hangover or after a few drinks means you have already reduced your performance before you've even started.
Reduced Muscle Function
If you are dehydrated from alcohol before starting a run, you may suffer from reduced muscle function sooner than someone who hasn't been drinking. According to the Human Kinetics website, dehydration causes a decrease in blood volume but increases the blood's thickness, meaning less of it is pumped around your body to reach and oxygenate your muscles. This causes them to work less efficiently and, therefore, you are forced to run slower.
Dulled Senses
According to drinkaware website from the United Kingdom, alcohol is a depressant, which means that your central nervous system and brain function is reduced. This, in turn, says "Running Times," affects your balance, co-ordination and reaction times, all of which are necessary abilities for running at your best and avoiding injury.
Recovery
After a run, you should focus on replenishing your fluids. Because alcohol is a diuretic -- which means it increases urination -- it can prevent you from rehydrating, says "Running Times." If you are going to drink before or after a run, have a glass of water between each alcoholic drink, limit your intake and make sure you are properly hydrated with water before setting off on your run.
