NUTRITION TIPS. PART NINE

Pre and Post Competition Eating

Long gone are the days when athletes thought that eating a big steak before a game would give them lots of energy. Today's elite sports men and women follow a strict diet, particularly on the day of a competitive match or event. While diet won't turn poor athletes into great ones, it can make the difference between performing poorly and tapping your full potential.

The Glycemic Index

Not all carbohydrate is digested and absorbed at the same rate. The Glycemic Index (GI) is a scale of how much a particular type of food raises blood sugar over a two-hour period compared to pure glucose.

For example, a piece of food with a GI score of 45 means that it raises blood sugar 45% as much as pure glucose in that two-hour period.

Common sense says that simple sugars which are broken down quickly, like fructose in fruit, should have a higher GI than complex carbohydrates, but that's not always the case. White bread, white rice and potatoes (all classed as complex carbohydarets) have a very high GI. That means they raise blood sugar almost as much or even more than pure glucose. Fructose has medium GI because the fibre found in fruit slows digestion and absorption.

Choosing foods with a high GI will help to quickly replenish carbohydrate stores after a game or event. Before a game or event, low GI foods are more appropriate as they release energy more slowly and for a longer period.


Pre Match Eating

The goal prior to a game or event (and even a training session) is to maximise carbohydrate stores in the muscles and liver and to top up blood glucose stores. Studies have shown that consuming foods with a high GI within an hour of exercise can actually lower blood glucose, which is not what an athlete wants! The reason is because the body produces an "overshoot" of insulin, which helps muscles to take up sugar in the blood. This in turn causes low blood sugar levels.

Athletes should eat foods with a low to medium GI before a match. This allows for a relatively slow release of glucose into the blood and avoids the unwanted insulin surge.

Consuming carbohydrate at least an hour before the start allows any hormonal imbalance to return to normal.

Example low GI foods include pasta, whole grain breads and rice, oatmeal, milk and milk products and fruit (except bananas and dried fruit).

The pre-match meal might consist of pasta in a low-fat tomato sauce, baked beans or scrambled eggs on toast and fresh fruit such as apples, pears or orange juice. Some grilled fish or chicken and vegetables could accompany the carbohydrates. Ideally this meal should be eaten at least three hours prior to the start - especially if nerves are a factor, which can impair digestion.

Food in the stomach is given a high priority to be digested before it has chance to spoil. As a result greater blood flow is directed to the digestive tract - not good news when players' muscles will soon be demanding an increase in blood flow too. The result of performing with a full stomach is nausea - the body's attempt to cease exercise so that it can redirect blood flow back to the stomach.

There is one exception to consuming carbohydrate immediately prior to the start of a game and it's in the form of a sports drink 5 or 10 minutes before kick off.

For more details I strongly recomend you to consider THE EVERY OTHER DAY DIET GUIDE

NUTRITION TIPS. PART EIGHT

MINERALS

Minerals account for roughly 4% of a person's body mass. They provide the structure for forming bone and teeth. They also help muscles to contract, maintain normal heart rhythm and control the acid-base balance as well as other important bodily functions.

Minerals are classed as either major or trace depending on how much is required per day. Major minerals include calcium, phosphorus, sodium, potassium and magnesium. Trace minerals include iron, zinc, copper, selenium and chromium.

CALCIUM

The typical Western diet contains too little calcium. The RDA for calcium is 800-1000 mg for adults and 1200 mg for adolescents. The average adult consumes just 500-700 mg per day and for many it's as little as 300 mg per day. Calcium deficiency can lead to a condition called osteoporosis - a weakening of the bones. Exercise actually helps to maintain healthy bone density.

SODIUM

Most adults consume too much sodium (found in abundance in processed foods), which can lead to high blood pressure. The RDA of 1100-3300 mg is equivalent to 0.5-1.5 teaspoons of table salt. Most people consume more than 2 teaspoons from processed foods even when table salt isn't used as seasoning.

IRON

Iron is helps the blood to carry oxygen so an iron deficiency (called anaemia) can lead to fatigue even with mild exercise. Some research has suggested that heavy exercise training creates an increased demand for iron. However, even in elite athletes, supplements are unnecessary if the diet contains iron-rich foods.

As with vitamins there is no convincing research to suggest taking mineral supplements can improve sporting performance. Exceeding the recommended daily allowance can also be potentially harmful. The only exception is adding a small amount of sodium to sports drinks during hot weather (¼ -½ teaspoon per litre of water).

This is the end of Part 4. In Part 5 we will examine pre and post competition eating. We'll cover sample meals and snacks that are ideal before a match or following a heavy training session.

MORE DETAILED INFORMATION IS HERE


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NUTRITIONS TIPS. PART SEVEN

VITAMINS

Thirteen different vitamins have been identified and studied to date. They are classed as either fat-soluble (vitamins A, D, E, K) or water-soluble (vitamin B complex, vitamin C). Together they are responsible for blood clotting, neuromuscular function, healthy skin, teeth and bones and numerous other bodily functions.

A well-balanced diet should provide an adequate supply of all the vitamins regardless of age and level of physical activity. During periods of intense training, a natural increase in food intake supplies any extra vitamin demand the body may have.

Free Radicals, Antioxidants & Exercise

Free radicals are highly reactive molecules that can cause damage to the cells and are thought to accelerate the aging process and contribute to cancer, heart disease and diabetes. They are found in cigarette smoke, environmental pollution and some medications. Exercise may also increase the production of free radicals.

The body has an elaborate defence system against free radicals in the form of antioxidant enzymes. Vitamins A, C and E are known as antioxidant vitamins and can protect the cells against free radical damage. Although foods like citrus fruits, green vegetables and nuts contain antioxidant vitamins, some athletes feel the need to take a supplement due to the high level of training they undergo.

Although exercise is thought to increase free radical production, it also appears to increase the body's antioxidant defence system at the same time. However, there is some research to suggest that a vitamin E supplement can reduce harmful free radical production associated with exercise. Whether this offers any overall health benefits is still unclear.

Over 40 years of research has failed to show that vitamin supplementation can offer any sort of performance enhancement when a nutritionally balanced diet is present. Some vitamins (such as vitamin C) taken in excess can actually be harmful. The recommendation is to eat a well balanced diet rich in fresh fruit and vegetables.

EXELLENT LEARNING MATERIAL CAN BE FOUND AT THE EVERY OTHER DAY DIET GUIDE