December 2 notes - Case Study on Protein Nutritional Status...

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Case Study on Protein Nutritional Status Meet JT: 33 years old 5’5” tall, 115 lb (but has been losing weight) Runs ~100 km/week (recently increased to this level) On vegan diet for 2 yr Currently takes multivitamin/mineral, and calcium supplements (600 mg) 310
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Nutritional Assessment of JT 1. What are her energy needs? 1. What are her protein needs? Should they be higher than for a non-athlete? 1. How do we assess whether JT has the correct balance of protein, fat and carbohydrate in her diet? 1. What is the impact of her being a vegan vegetarian on her protein needs? 1. What biochemical measures can be taken to assess whether JT has a normal protein nutrition status? 311
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Nutritional Aids to Enhance Exercise Performance p. 245-5, p. 190-91 Did you know that you can increase exercise performance with nutritional aids? What nutritional aids are you familiar with? 312
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The body’s fuel reserves 313
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Fuel sources during exercise (Fig 8.11, 8.12) Use of each substrate depends on extent of exercise: 1. Low-intensity exercise (walking for 2 hr) Plasma FFA and muscle triglycerides 2. Moderate-intensity exercise (running 1-3 hr) Muscle triglycerides but slow as need transport into mitochondria and more O 2 Plasma glucose and muscle glycogen 3. High-intensity exercise (sprint) Muscle and liver glycogen PCr Lactate in muscles 314
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315
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316
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Nutritional ergogenic aids Agents ingested to enhance capacity for sports exercise and physical performance ‘ergo-’ ‘to work’ Enhance energy production , energy control , and/or energy efficiency Some common nutritional interventions/supplements 1. Carbohydrate loading 1.
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