Re-interpreting anaerobic metabolism: an argument for the application of both anaerobic glycolysis and excess post-exercise oxygen comsumption (EPOC) as independent sources of energy expenditure

European Journal of Applied Physiology and Occupational Physiology
C B Scott

Abstract

Due to current technical difficulties and changing cellular conditions, the measurement of anaerobic and recovery energy expenditure remains elusive. During rest and low-intensity steady-state exercise, indirect calorimetric measurements successfully represent energy expenditure. The same steady-state O2 uptake methods are often used to describe the O2 deficit and excess post-oxygen consumption (EPOC): 1 l O2 = 5 kcal = 20.9 kJ. However, an O2 deficit plus exercise O2 uptake measurement ignores energy expenditure during recovery, and an exercise O2 uptake plus EPOC measurement misrepresents anaerobic energy expenditure. An alternative solution has not yet been proposed. Anaerobic glycolysis and mitochondrial respiration are construed here as a symbiotic union of metabolic pathways, each contributing independently to energy expenditure and heat production. Care must be taken when using O2 uptake alone to quantify energy expenditure because various high-intensity exercise models reveal that O2 uptake can lag behind estimated energy demands or exceed them. The independent bioenergetics behind anaerobic glycolysis and mitochondrial respiration can acknowledge these discrepancies. Anaerobic glycolysis is an additive component to an ...Continue Reading

Citations

Jun 9, 2005·European Journal of Applied Physiology·W A BraunM M Markofski
Nov 6, 2003·Sports Medicine·Elisabet Børsheim, Roald Bahr
Jun 10, 2011·Advances in Physiology Education·Donald C Jackson
Apr 5, 2002·Medicine and Science in Sports and Exercise·M Kathleen Thornton, Jeffery A Potteiger

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