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Unformatted text preview: HHS 231 Fall 2007 Outline for Week 3, Lecture 2 “Fueling for Cardiorespiratory Training” The Energetics of Physical Activity 1. What fuels our physical activity & exercise? Atp 2. Where does ATP come from? The 3 energy systems 3. What fuels the energy systems? Glycogen and fats 4. How much glucose and fat am I using? The crossover effect From Fat & Carbohydrate to Physical Activity: The Role of ATP • Adenosine triphosphate (ATP) • The energy “currency” of the body • ATP must be generated continuously • The body only stores enough ATP for… 1-3 seconds of activity. • After depleting ATP stores, muscles… turn to other sources of energy – the energy pathways! Pathway 1: Immediate or “explosive” Quickest, most powerful movements • Can only be sustained for… a very brief time • Approx 10 seconds • does NOT require oxygen • Anaerobic activity • uses Creatine Phosphate (CP) • limited by… CP availability Pathway 2 : Anaerobic or “Glycolysis” High- intensity activities that… can be maintained for a short duration • Used at… the start of exercise • Approx. 10 seconds – 2 minutes • Does NOT utilize oxygen • An aerobic activity • Relies primarily on… Muscle glycogen Pathway 3 : Aerobic or “Oxidative” Lower- intensity activity that… can be maintained for longer durations • Used for activity that… lasts longer than 2 minutes...
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This note was uploaded on 06/16/2008 for the course HHS 231 taught by Professor Catherineboshuizen during the Fall '08 term at Oregon State.
- Fall '08