PHYSIOLOGICAL RESPONSES TO PHYSICAL ACTIVITY vce physical education unit 3.

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PHYSIOLOGICAL RESPONSES TO PHYSICAL ACTIVITY vce physical education unit 3. FOODS, FUELS AND ENERGY SYSTEMS. FOOD FUELS. Our food intake consists of three basic nutrients: CARBOHYDRATES FAT PROTEIN. CARBOHYDRATES. - PowerPoint PPT Presentation

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<p>PHYSIOLOGICAL RESPONSES TO PHYSICAL ACTIVITY</p> <p>PHYSIOLOGICAL RESPONSES TO PHYSICAL ACTIVITYvce physical educationunit 3.FOODS, FUELS AND ENERGY SYSTEMSFOOD FUELSOur food intake consists of three basic nutrients:CARBOHYDRATESFATPROTEINCARBOHYDRATESCARBOHYDRATES ARE THE BODYS PREFERRED FUEL SOURCE, ESPECIALLY DURING EXERCISESUGARS AND STARCHES SOURCES: FRUIT, CEREAL, BREAD,PASTA, VEGETABLES.</p> <p>.</p> <p>FATACTS AS A CONCENTRATED FUEL STORAGE IN MUSCLES.IT IS THE BODYS MAIN SOURCE OF FUEL AT REST AND DURING PROLONGED SUBMAXIMAL EXERCISE.</p> <p>SOURCES: BUTTER, CHEESE, OIL, NUTS, FATTY MEATS.</p> <p>PROTEINPROTEINS MAKE A NEGLIGABLE CONTRIBUTION TO ENERGY PRODUCTION DURING EXERCISE.MAINLY USED FOR GROWTH AND REPAIR.</p> <p>SOURCES: MEAT, FISH, POULTRY, LEGUMES, EGGS, GRAINS</p> <p>STORAGE OF FOOD FUELFood FuelStored asSite(s)Recommended daily proportions %CarbohydratesGlycogenMuscles and liver55-60%FatFatty Acids are stored as triglyceridesAdipose tissueMuscles25-30%ProteinProtein or enzymesMuscles10-15%How does food help us move?ALL FOODS ARE BROKEN DOWN AND STORED AS CHEMICAL ENERGY.</p> <p>THIS MUST BE THEN BE CONVERTED TO MECHANICAL ENERGY TO ALLOW MUSCULAR CONTRACTIONS AND MOVEMENT TO OCCUR.ATP ADENOSINE TRIPHOSPHATEMOLECULES OF ATP CONSIST OF ATOMS HELD TOGETHER BY BONDS THAT STORE ENERGY.</p> <p>CHEMICAL ENERGY IS PRODUCED WHEN ATP IS BROKEN DOWN.</p> <p>ENERGY IS THEN RELEASED TO FUEL ALL PROCESSES WITHIN THE BODY.</p> <p>ONLY A VERY SMALL AMOUNT OF ATP EXISTS AT THE MUSCLES.ATPADP + P+P+PIADENOSINEPPPIADENOSINEPPPENERGY FOR MOVEMENTTHREE ENERGY SYSTEMSANAEROBIC SYSTEMS-WITHOUT OXYGEN</p> <p>ATP-PC / ALACTACID SYSTEMLACTIC ACID /ANAEROBIC GLYCOLYSIS</p> <p>AEROBIC SYSTEM WITH OXYGEN</p> <p>AEROBIC SYSTEM / AEROBIC GLYCOLYSISFOOD FUELS AT RESTFAT AND GLYCOGEN ARE THE PREFERRED FUELS UNDER RESTING CONDITIONS.</p> <p>RESTING CONDITIONS SUPPLY THE HEART, LUNGS AND BLOOD VESSELS WITH SUFFICIENT OXYGEN, AND THEREFORE ATP, TO MEET THE ENERGY REQUIREMENTS.FOOD FUELS DURING EXERCISETHE INTENSITY AND DURATION OF EXERCISE DETERMINES WHICH ENERGY SYSTEM IS THE MAJOR CONTRIBUTOR GOR ENERGY.</p> <p>HIGH INTENSITY EXERCISE / ANAEROBIC EXERCISE FOOD FUEL IS CARBOHYDRATES</p> <p>LOW INTENSITY EXERCISE / AEROBIC EXERCISE CARBOHYDRATES THEN FAT.PROTEIN AS A FUEL IS ONLY USED IN EXTREME ULTRA LONG DISTANCE EVENTS, SUCH AS MARATHONS/IRONMAN TRIATHLONS.</p> <p>GLYCEMIC INDEX (GI)THE GLYCEMIC INDEX IS A WAY OF CLASSIFYINNG CARBOHYDRATES BY THEIR IMMEDIATE EFFECT ON BLOOD GLUCOSE LEVELS.</p> <p>GLYCEMIC INDEXHIGH GLYCEMIC INDEX - Carbohydrates are rapidly absorbed into the blood stream and have an immediate effect on blood glucose levels.</p> <p>LOW GLYCEMIC INDEX Carbohydrates take a lot longer to break down and be absorbed into the bloodstream, thus having a slower, more sustained effect on blood glucose levels.GLYCEMIC RESPONSE</p> <p>EXAMPLES OF GI VALUESA low GI value is 55 or less (bananas, grain bread, lentils, apples, porridge, spaghetti)A medium GI value is 56-69 (white bread, mars bar, rye bread, ice cream)A high GI value is 70 or more (glucose, mashed potato, white rice, doughnut, cornflakes)</p> <p>Glycemic index and exerciseBEFORE EXERCISE Low GI carbohydrates should be consumed 45-60 minutes before exercise. These are recommended as they sustain blood glucose levels minimising any increases in insulin release.</p>

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