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Sports Drinks

AQA GCSE Biology - B3.1.1

Peter Fearon

on 9 September 2012

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Transcript of Sports Drinks

Sports Drinks Learning Objective To understand how sports drinks differ from soft drinks and to evaluate the claims made by sports drink manufacturers. People love soft drinks FACT So what are the ingredients of these 'soft' drinks? water colourings SUGAR!!! Sweeteners (Diet versions) Carbon Dioxide (FIZZ) Athletes and amateurs alike, often buy special sports drinks These athletes think these drinks boost their performance and help recovery after activity. £250m £ the amount spent on sports drinks in the UK last year The question is:

Do these drinks actually boost performance or do other drinks do the same thing? The Impact of Exercise What happens when you exercise? 1 Respiration increases When doing exercise, your muscles are contracting more so that you can move - this uses up energy (in the form of sugars) by respiration. 2 Fluid Loss During exercise, your body sweats to keep its temperature stable. Sweat contains mineral ions and water - the more you sweat, the more you lose. The action of sweating can affect the concentration of your body fluids. LOW HIGH Concentration Gradient Affected What will happen if body fluids become more concentrated? If body fluids become more concentrated, water will leave cells by osmosis - leaving them dehydrated. If the water/mineral ions lost during exercise are not replaced, the balance of water and mineral ions in your body will be disturbed. Without the right balance of water and minerals, your cells will not work properly. This is why it important to replace the sugars used in respiration and the water and mineral ions that are lost. Enter the sports drink companies! SPORTS DRINKS Water sugar
(mostly glucose) colourings flavourings The Claim: "RotYerTeethade keeps you hydrated and replaces important electrolytes lost during exercise - an essential addition to any smelly gym bag!" Really? The Facts: Sports drinks are mainly water so they dilute body fluids. This allows water to move back into the cells and rehydrate them by osmosis. High Concentration Body Fluids
(Dehydration) Sports drink is drunk water osmosis Cells The sports drinks also contain salts - this restores your mineral ion balance. The sugar in the drinks restores blood sugar levels - glucose moves into the cells by diffusion and active transport. sugars active transport +
diffusion Sports drinks are expensive and not everyone thinks they are worth the money. 'Isotonic sports drinks are not really necessary for activities lasting less than one hour - plain water will suffice.'
Jeanette Crossland - Team GB Nutritional Consultant. Look at this data: How should we best present it? Draw four bar charts based on the information contained in the table. TASK Use your understanding of the roles of energy, protein, carbohydrates and ions to draw conclusions about the suitability of each of the drinks. All of the drinks will rehydrate the body (they are mostly made up of water). There is evidence that milk is one of the more effective ways of rehydrating cells, replacing lost sugars/salts and providing your muscles with protein of repair and growth. TASK Explain why a long-distance runner should chose an isotonic drink rather than a soft drink after a race.
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