EXSC_exam_no.1_notes(2)

EXSC_exam_no.1_notes(2) - 1/13 Lecture Preview...

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1/13 Lecture Preview Questions/Statements 1. An attempt to understand what limits and what facilitates one’s optimal performance Why does fatigue occur after running 1-2 miles? o Limiting factor is: cardiovascular Is it caused by the same factors as in a marathon? o Limiting factor: ability to conserve carbs o Glycogen reserves deplete at about 18-22 mi (marathon 26 mi) What about 100 meters? o Limiting factor: muscle mass, ATP (immediate energy) 2. What are the best and most efficient methods of training athletes for their respective sports? Understanding limits helps to determine optimal training Consider football players: should they train for distance or sprinting? o Sprinting: consider how much actual distance running a football player does (field is only 100 meters long) No way to determine if there are racial factors in muscle type composition 3. What makes the elite or super athelete? Body composition, aerobic ability can be determined in a lab Are average individuals attain elite status by training? o There are certain physiological factors that give advantage, genetics far outweigh training o Ex: number of muscle fibers an individual has
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But now there are gene manipulations that can change create these natural advantages 4. Effects of environment on performance: heat, cold, altitude, air pollution etc. 1/15 Lecture Metabolism: chemical conversion of food to useable energy ATP: adenosine triphosphate, universal source of energy for muscles (limited amount) o Is a single enzyme system and an immediate source of energy Rephosphorylation: makes more ATP, energy comes from food broken down in metabolic process CP: creatine phosphate also rephosphorylates ADP: adenosine diphosphate, makes more ATP (called rephosphorylation) o Energy comes from food broken down in metabolic process Fuel reserves o ATP+CP= calories (10-15) and to put in to perspective, it takes about 100 calories to run a mile, and expend about 1 calorie/min at rest o Glycogen= 100-1500 calories (in animals and stored in skeletal muscle and some in liver) Glycogen stores will be maintained unless under extreme conditions (like starvation or marathon) o Fat: is variable Ex: a man is 180lb and 10% body fat 18lb of fat in the body at 4000 calories per lb of fat 72,000 calories in fat in the body Fat is limit, however, because the body cannot readily metabolize fat in exercise
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Glycolysis: is anaerobic, breakdown of sugar (glucose) o NAD is hydrogen transporter, delivers them to aerobic system combines with O2 to make H2O Nicotinamide adenine dinucleotide Is limited in glycolysis Derived from vitamin B1,B2,B3 (niocyn,
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EXSC_exam_no.1_notes(2) - 1/13 Lecture Preview...

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