exercise physiology

Question 1

anaerobic metabolism

ATP-PC or phosphagen system

Answer 1

• ATP production during high intensity, short duration exercises - 11m sprint
• process almost instant: phosphocreatine -> ATP
• provides E for muscle contraction up to 15s
• does not depend on long chemical reactions
• does not depend on O2 transport to muscles
• ATP and PC stored within contractile mechanisms of muscle

Question 2

anaerobic glycolysis

lactic acid system

Answer 2

• major supplier of ATP during high intensity, short duration (sprint 400-800m)
• stored glycogen split into glucose -> split again to pyruvate through glycolysis, E released forms ATP
• no O2 required
• results in lactic acid formation - causes muscular fatigue
• 50% slower than PC system and can provide 30-40s muscle contraction
• does not require O2
• only uses carbohydrates (glycogen and glucose)
• release enough E to synthesize small amounts of ATP

Question 3

aerobic metabolism

oxygen system

Answer 3

• used doring low intensity, long duration exercise (running a marathon)
• yields most ATP by requires series of complex chemical reactions
• E throug oxidation of food – fatty foods, amino acids, glucose with O2 release
• provides E as long as there are nutrients to utilize