Lecture 7-2notes - Oxygen debt Oxygen debt has two elements...

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10/12/10 1 Locomotion Energetics and Mechanics 10/13 Oxygen debt Oxygen debt has two elements – Consumption of creatine phosphate Creatine phosphate is high energy phosphate compound Creatine-P Creatine Rapid way of getting ATP regenerated without involving mitochondria Does not consume O 2 . ADP ATP Oxygen debt has two elements – Consumption of creatine phosphate – Generation of lactate as a result of glycolysis Occurs in cytoplasm • Anaerobic: does not consume O 2 Oxygen debt glucose pyruvate lactate ADP ATP Recovery Oxygen debt as two elements – Consumption of creatine phosphate – Generation of lactate as a result of glycolysis Recovery also has two elements – Rephosphorylation of creatine, at expense of ATP creatine-P creatine ADP ATP
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10/12/10 2 Recovery Oxygen debt as two elements Recovery also has two elements – Rephosphorylation of creatine – Recovery of lactate lactate pyruvate gluconeogensis glucose AcCoA CO 2 ADP ATP ADP ATP TCA respiration O 2 Cost of exercise Measure steady state O 2 uptake Eckert Animal Physiology Fig. 16-2 Cost of exercise Measure steady state O 2 uptake Vary speed of movement Eckert Animal Physiology Fig. 16-2 Cost of exercise Measure steady state O 2 uptake Vary speed of movement Compare different animals
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10/12/10 3 Cost of exercise Measure steady state O 2 uptake Vary speed of movement Compare different animals – Note: different animals may take different amounts of time to come to steady state oxygen consumption Cost of exercise Large animal requires more energy to start. Steady state not very steady Eckert Animal Physiology Fig. 16-17 Cost of exercise Measure steady state O 2 uptake rate Or, measure total O 2 uptake during all exercise and recovery; divide by time of exercise Vary speed of movement Compare different animals Cost of exercise Consumption of energy at rest is higher (per gram) for smaller animals – Well known: birds, mice – Reasons not clear Eckert Animal Physiology Fig. 16-17
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10/12/10 4 Cost of exercise Consumption of energy at rest is higher (per gram) for smaller animals
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