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NUTRITION

NUTRITION. ADVANCED CERTIFICATE: EXERCISE SCIENCE HFPA. ATHLETES AND NUTRITION.

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NUTRITION

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  1. NUTRITION ADVANCED CERTIFICATE: EXERCISE SCIENCE HFPA

  2. ATHLETES AND NUTRITION ‘Proper nutrition is an important consideration for athletes who seek to maximise their performance. No diet directly increases strength, power or aerobic endurance but an adequate diet allows athletes to train and compete to the best of their ability’ (Baechle & Earle, 2008, p. 201).

  3. IDEAL DIET DEPENDS ON: • Age • Body size • Sex • Genetics • Environmental training conditions • Duration, frequency and intensity of training Therefore the ideal diet for an athlete is one that is individualised.

  4. YOUR ROLE As an Exercise Specialist, you will spend many hours with athletes and thus you are in a perfect position to recognise signs of eating disorders and provide information about the athlete’s training to a Nutritionist.

  5. WHO IS AT RISK?

  6. FOOD PYRAMID

  7. MACRONUTRIENTS A macronutrient is defined as a nutrient which is required in significant amounts in the diet. (Macro is defined as large scale by the Concise Oxford English Dictionary). Three important classes of macronutrients are proteins, carbohydrates and lipids.

  8. MICRONUTRIENTS A micronutrient is a nutrient (vitamins and minerals) that is required in small amounts in the diet.

  9. FLUID AND ELECTROLYTES Water is crucial when exercising as it plays a role in thermoregulation. Thermoregulation is defined as the controlling of temperature at a core temperature of 37 degrees Celsius. The body generates heat (thermogenesis) when exercising and therefore the body needs to have ways of loosing this ‘excess heat’ as an increase in core temperature could cause heat damage. One of the ways in which heat is lost is through sweating i.e. water is secreted by sweat glands onto the surface of the skin and when this sweat evaporates it reduces the surface temperature.

  10. FLUID REPLACEMENT • The rate of fluid loss (through sweating) can have an adverse effect on performance and is extremely dangerous because it causes dehydration. • The effects of dehydration are: fatigue, lowered blood pressure, lowered performance, increased body temperature, reduced urine output, increased pulse rate and circulatory collapse.

  11. Avoiding Dehydration • Athletes should be well hydrated prior to beginning a workout or competition. • Athletes should consume 150-300ml of fluid every fifteen to twenty minutes during exercise. • Athletes should monitor fluid losses during exercise by monitoring body weight before and after exercise. • Monitor the colour of urine between workouts i.e. colour of lemonade then athlete is well hydrated whereas dark-yellow urine indicates dehydration.

  12. PRE-COMPETITION Purpose: Provide fluid and energy for the athlete during the performance. Timing: 3-4 hours prior to the event • Contact sports • Lose appetite or feel nauseous • Get diarrhea before or during event • Exercise in heat • High intensity sport OR 30 minutes • Hungry during an event • Feel shaky or weak • Aerobic – maximise stores

  13. PRACTICAL CONSIDERATIONS • What they like • That they tolerate well • That they are used to consuming • That they believe result in a winnning performance

  14. CARBOHYDRATE LOADING • Used to enhance muscle glycogen prior to long term aerobic endurance. • Most effective regime – three days with tapering exercise the week before competition and complete rest on day before competition. • Adequate calories with 600g of carbohydrate per day or 8 to 10g / kg of body weight. • Increase muscle glycogen stores 20- 40% above normal. • Benefits for: distance runners, road cyclists, cross-country skiers • Side-effects: increased water retention and weight gain, flatulence and diarrhea

  15. POST-COMPETITION • High GI replenish faster than low GI • Directly after exercise??? Up to 8-24 hours later. • Balanced meal seems preferable – effective way to achieve caloric intake and to enhance recovery.

  16. WEIGHT GAIN • Why? Improve physical appearance or enhace athletic performance. • Muscle mass = combination diet + progressive resistance training But genetic predisposition, somatotype and compliance determine athlete’s progress. • Muscle tissue = 70% water+ 22% protein + 8% fatty acids and glycogen. • 350 to 700kcal above daily requirements for 0.4 – 0.9 kg weekly gain • Larger portions • More items • Eat frequently – minimum 5 times a day • Higher caloric foods

  17. WEIGHT LOSS • Why? Lower weight category or lower body fat • Minimal body fat is largely genetic • Well balanced diet with caloric deficit • Loose body mass as well as lean body mass in athletes • Gradual weight loss ensures maximum fat loss and preservation of lean body mass. • Not less than 1800 to 2000 kcal per day for athletes • Foods high in nutrient density and low in energy density. • Weight loss should occur in off-season or pre-season • Self monitoring most effective for achieving weight loss • Amount and type of food consumed • Feelings, times and places of intake • Exercise habits

  18. ERGOGENIC AIDS • An ergogenic aid is defined ‘as work-producing substances or phenomena believed to increase performance’ (Powers & Howley, 2010, p.535). They therefore include nutrients, drugs, warm-up exercises, hypnosis, stress management, blood doping, oxygen breathing, music and extrinsic biomechanical aids. When Baechle & Earle (2008) – NSCA textbook -consider ergogenic aids they refer specifically to pharmacological aids such as: 1. hormones and drugs and 2. dietary supplements.

  19. ANABOLIC STEROID • Synthetic testosterone / pre-cursors for testosterone • Stimulate protein synthesis • Stacking regime and cyclic regime • Increased muscle mass, strength and athletic performance.

  20. INSULIN • Anabolic hormone • Facilitate uptake of glucose and amino acids • Increases protein synthesis • Potentiate effects of growth hormone • Side effect: Hypoglycaemia

  21. HUMAN GROWTH HORMONE • Stimulates muscle and bone growth, maintains blood glucose levels, increases uptake of glucose and amino acids in muscle cells and release of fatty acids from fat cells. • Effects – gigantism and acromegaly

  22. ERYTHROPOIETIN (EPO) • Elevations in haemoglobin and haemocrit • Increases in RBC increases blood viscosity • Risk of blood clotting, elevations in systolic blood pressure and compromised thermoregulatory system.

  23. Beta adrenergic agonists and Beta blockers • Regulate lipolysis and thermogenesis. • E.g. Clenbuteral (asthma medication) • Reduce anxiety and tremors during performance

  24. CREATINE • Creatine phosphate • Saturation limit (150 -160 mmol / kg) • 20 – 25 g daily for 5 days and then 2g per day thereafter • Reduce fatigue • Increases in body weight • No adverse effects accounted through research

  25. STIMULANTS • Caffeine • Central nervous system stimulant • Fat oxidation • Slows glycogen depletion and delays fatigue • Enhanced power production • Ephedrine • Thermogenic quality • Stacking agent with caffeine enhance effect • Citrus Aurantium • Appetite suppression • Increased metabolic rate • Lipolysis

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