esxc 9-17

esxc 9-17 - Uphill 30% more energy Down 24% less energy 6%...

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1L O2 = 5 Calories = 2153Kgm = 15575 ft lb @100eff. If eff is lower – then ^ calorie cost! Efficiency Eg = work/energy En = work/energy-rest Problem Work is 900 kgm/mm First convert to VO2 900/2153 = 0.42 L O2 x 5 = 2.1 Cal/min Was 16% 2.1/.16=13 cal/min 2 groups Males A B 170lbs 170lbs Runners Seditary but healthy ^ (uses more energy on the run) Runner head bobs, walker steady Derek Clayton Greta Waitz 8 min/mile x 276 mL O2/Kg/Min Untrained x 336 (delta) ^ = 22% Limitations of fuel reserves for endurance Economy- these two marathon runners are more economic than untrained controls. Middle-distance vs marathon More economical in marathon Energy costs aren’t critical in mid
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Unformatted text preview: Uphill 30% more energy Down 24% less energy 6% greater energy Pre-pubertal 9-10 <<<< Least efficient Motor uncoordination High energy expenditure HS 17-18 USC 20-22 Concepts of ht/wt body comp Ht vs wt. Body mass inex BMI = mass/ht^2 Skeleton is only 5% of fat free mass 1 kg = 2.2 lb Mass (kg)/ ht (m^2) Inch to m x 0.0254 18-24 ok >/25 overweight </17 underweight Mortality 12 BMI 24 1991-51% BMI >/ 25 2001 60 2005-65% 2030? 80% Weight vs body comp Males 59 189 BMI 28 2% fat 64 311lb BMI 38 11% fat Female 59 170 BMI 25.3 17% fat good 67 110lb 27% 17.5 Normal and starving...
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This note was uploaded on 10/27/2008 for the course EXSC 205Lxg taught by Professor Girandola during the Fall '07 term at USC.

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esxc 9-17 - Uphill 30% more energy Down 24% less energy 6%...

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