ANSC 330 Exercise Physiology I

Glycolysis glycolysis 2 krebs cycle cycle 3 pyruvate

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: t, Fast, but low ATP yield (36 ATP) Fuel for ATP Generation Cr-P + ADP + H+ Cr + ATP ADP + ADP ATP + AMP 14 Pathway 3: Aerobic Phosphorylation of ADP using Fatty Acids BetaBeta-oxidation Fatty acids used as fuels for energy Fatty acids broken down into acetyl co-A co- Dependent on O2 p Mobilization slow from TG in adipose and muscle Palmitate + 23O2 + 130ADP → 16CO2 + 16H2O +130ATP Relatively slow, high yield (Yields 36 ATP) 2 Lactate (Yields 3 ATP) (Yields 130 ATP) Stages of g glycogen and fat breakdown Marlin and Nankervis, 2002 15 Fuel for ATP Generation Cr-P + ADP + H+ Cr + ATP ADP + ADP ATP + AMP Pathway 4: Anaerobic (No Oxygen) Oxygen) Phosphorylation of ADP Using Carbohydrate: Carbohydrates used as fuels for energy h li it d when O2 limited Speed/intensity too high to get enough O2 to working muscle Glucose supplied from blood, muscle glycogen, liver glycogen l li l Anaerobic glycolysis: glucose to lactate glycolysis: Glucose + 2ADP → 2Lactate + 2H+ + 2ATP 16 Pathway 4: Anaerobic (No Oxygen) (No Oxygen) Phosphorylation of ADP Using Carbohydrate: Lactate and H+ are waste products Lactate: Lactate: Diffuses out of muscle Either metabolized to carbon dioxide and water Or recycled to glucose in liver, kidney and inactive muscle cells Hydrogen buffered in the cell, but still causes marked acidosis in the body Fast, low yield (3 ATP) (The Athletic Horse, Hodgson and Rose, 1994) Fuel Metabolism During Exercise 100 90 Percent of Total Energy 80 Aerobic Anaerobic 70 60 50 40 30 20 10 0 400m QH Race 1000m 1600m TB Race 3200m 1600m 3200m SB Race Day 2 80 km Ride 3 DE Endurance 17 Time to Exhaust Fuel Stores VO2max: max. capacity of body to transport and use oxygen during exercise, reflects physical fitness • 60% = endurance • 90% = four-star three day event steeplechase speed • 120% = flat race Marlin and Nankervis, 2002 Generating Energy for Work ATP required for muscle contraction Carbohydrates and fat primary fuel sources Aerobic metabolism of carbs and fats requires O2 Anaerobic metabolism of carbs occurs in the absence of O2 Contribution of ATP generated from aerobic vs anaerobic depends on level of exercise and training 18...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online