_2_3 Diet, activity, body comp assessment2010

_2_3 Diet, activity, body comp assessment2010 -...

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Unformatted text preview: Announcements Reminder that MyPyramid assignment due Wednesday (see Scholar) Introduction Sports Nutrition Overall goals of training & nutrition for athletes Maintain health Optimize performance Optimize performance Avoid injury Enhance recovery Nutritional long-term goals (chronic diet) are to provide adequate: Energy intake to meet demands Replacement of expended fuels Protein and other nutrients for growth & repai repair Diet to maintain healthy immunity Nutritional short-term goals (shortly before or during event/exercise) : Delay fatigue Prevent depletion fuels Prevent build up of compounds that contribute to fatigue Minimize dehydration Utilize strategies that could enhance performance In order to make recommendations on changes need to know current status Assessment in sports nutrition Body composition, Energy expenditure, Dietary intake Body Composition Assessment How is it done? What are the recommended guidelines? How do you answer this question? How do you calculate body fat from BMI? How about this one from a coach: Provide the ideal body fat for each position on a football team Terms FM: fat mass (all lipid in body) FFM: fat-free mass (everything else = bone mass (BM) + protein mass (PM) + bone mass (BM) + protein mass (PM) + water (W) Two, Three, and Four Compartment Models of Body Composition Figure 11.2 Most of the methods we use are two compartment General methods Laboratory methods Field methods We arent going to discuss every method or discuss theoretical issues in this class We will focus on practical issues of those methods youd be likely to use with athletes you counsel Considerations When Estimating Body Composition Accuracy Practicality and portability Ease of use Cost Subject comfort and effort Technician training Ease of use Time Technician training Comparison of methods textbook Table 11.1 Comparison of Methods to Estimate Body Composition, cont Table 11.1 Densitometry (density = M/V) Underwater weighing body volume is proportional to amount of weight lost from air to water http://www youtube com/watch?v=uv9UTK http://www.youtube.com/watch?v=uv9UTKj s1_0&NR=1 Plethysmography body volume is estimated by air displacement (Bod Pod) http://www.youtube.com/watch?v=Ch3Ln5 1wumU Densitometry is gold standard but assumes: Density of fat tissue at 0.9 gm/cm 3 Density of lean tissue is 1.1 gm/cm 3 When would this be violated? dehydration (e.g. wrestlers, dieters) high bone mass and density (e.g. resistance trainers, African American) low bone mass and density (e.g. older indiv., children) BodPod- Plethysmography Estimates body volume based on displacement of air in the chamber If know weight (mass) and volume can compute body Density Field Measurements Anthropometry Skinfolds Bioelectric impedance Skinfold measurement Assumes these sites are representative...
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This note was uploaded on 03/23/2010 for the course HNFE 4174 taught by Professor Rankin during the Spring '10 term at Virginia Tech.

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_2_3 Diet, activity, body comp assessment2010 -...

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