Working out and alcohol, do they mix?

Alcohol (ethyl alcohol or ethanol), one of the worlds oldest, most widely used, drugs, has many effects on the body, some positive, but most negative. Historically, alcohol has been blamed for many of the worlds tragedies and problems, from the fall of the Roman Empire (What's Your Poison; 1997) (1) to the disbanding of many families. Ironically, it is made from relatively innocuous substances.

Fermented grain, fruit juice and honey have been used to make alcohol for thousands of years. Alcohol's use spans nationalities and demographics as it serves to relax and provide a source of enjoyment. It has even been shown to have some salutary effects, such as a blood thinning action beneficial to the cardiovascular system, in addition to the aforementioned social and relaxation aspects.

However, the doses required in these instances are very minimal (1-2 glasses in most cases), and anything beyond this more than outweighs any potential benefits. This is partly because alcohol is classed as a central nervous system depressant, causing the brain to relax and inhibitions to decrease.

Ones rational thought, emotional status, judgement, speech and muscle coordination are adversely affected through alcohol consumption. Alcohol is specifically detrimental to those on a muscle building program or fat loss plan, or any athlete, in that it can interfere with recovery, protein synthesis, hydration, motivation, and nutrient intake.

A review of the research will show that alcohol is poisonous to every organ in the body and will adversely affect everyone who engages in its use to some Extent (1, 6, 7, 8). This article is not intended to dissuade people from using alcohol moderately, for recreational purposes, but will point out, from an athlete and a researchers point of view, its significant shortcomings.



Implications For Trainees


Alcohol is particularly detrimental for athletes or anyone following a fitness regimen as it interferes with many of the processes so vital to success (3,5). Focus, performance, recovery and rebuilding are all affected. Given that alcohol's effects can linger on for days an athlete would be wise to refrain from its use when competing.

Although alcohol is absorbed rapidly it is metabolized very slowly and its effects may still impact athletic performance up to 48 hours after the last drink.

Assuming the athlete is performing within 48 hours of its consumption, as little as two to three standard drinks can directly:

Decrease strength

Impair reaction time

Impair balance and eye/hand coordination

Impair fine motor and gross motor coordination

Increase fatigue: Liver function is significantly impacted following the ingestion of alcohol. Up to 48 hours after the last drink the liver may still be metabolizing alcohol at the expense of glycogen (metabolized carbohydrate). Given that glycogen is vital for most of the body's cellular functions, body fatigue, cognitive decline and loss of strength will result when it cannot be used efficiently. Reaction time, balance, coordination are also impacted by this process in addition to the direct aforementioned neurochemical effects alcohol has on the brain.

Interfere with body temperature regulation

Cause dehydration: Alcohol has an impact on kidney function, which interferes with the regulation of electrolytes and fluids in the body (7). Cellular waste removal and nutrient supply are the main functions of fluid and electrolytes, which are controlled through kidney function.
The kidneys filter large amounts of water from many parts of the body, including the brain, to break down alcohol. This causes dehydration and can cripple an athletes performance.

Deplete aerobic capacity and negatively impact endurance for up to 48 hours after the last drink

Impact cellular repair: Protein metabolism is negatively impacted when alcohol is in the system. This has obvious implications for muscle repair.

Impacts the cardiovascular system: Alcohol consumption raises blood pressure and this can result in the heart having work harder to pump blood through the body (8). An abnormally fast heart beat (tachycardia) can also result from alcohol consumption. Further, alcohol increases the synthesis of cholesterol and this can increase the risk of coronary heart disease.

Disrupt sleep: Alcohol significantly interferes with restful sleep (4). It can make falling to sleep easier to begin with due to its sedative effects but the quality of sleep (particularly rapid eye movement) will be disturbed.

Cause vitamin and mineral depletion: Vitamins and minerals so necessary for our health have their absorption interfered with, while the body's own supply are slowly depleted, when alcohol is consumed. Even one or two drinks per day (supposedly the "recommended" amount) can have this effect. B vitamins, which have important enzymatic and metabolic functions are depleted extra rapidly (8).
This deleteriously effects the heart, liver, thyroid and kidneys. Vitamin A is also depleted and this interferes with the body's ability to fight disease. Vitamin C depletion makes one susceptible to anemia. Also, when alcohol is ingested the body excretes calcium at twice the normal rate, thus impacting on bone growth and wound healing.

Cause cognitive impairment: cognitive impairment (disruption of thought processes and brain damage) occur through a number of mechanisms (6,7). Alcohol related sleep disruption contributes to the insufficient restoration of ones neural processes. The effects of GABA-A stimulation, as explained, have been shown to contribute to neural death. Lack of glycogen to the brain, as a result of alcohol metabolism, causes slow, disoriented, thinking. These are just some factors. There are many more. The implications of cognitive impairment are severe for athletes: loss of motivation, focus and desire in addition to lessened perspicacity and even neuromuscular response.

The effects outlined here are just some of the more obvious ones. There are many others, and it would probably take a book to outline and explain them in sufficient detail.


Conclusion


Even though alcohol will greatly impact performance 25 to 48 hours after the last drink, it has longer lasting, more indirect, effects. The reduction in quality of training and sleep in the period after its consumption, may cause a reduction in performance over the days following this period.