LECTURE 5 and 6 Lipids

E this doesnt mimic true intracellular conditions but

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Unformatted text preview: assic markers" used to demonstrate training status Aaron A note about science: •  generally, scientists measure maximal rates of these enzymes in a test tube under optimized and artificial conditions •  i.e. this doesn't mimic true intracellular conditions! •  but in general, there is good agreement that more mitochondria allows for a greater utilization of fat, and less dependency on carbohydrate (especially glycogen) What happens to fat oxidation with aerobic training? At a given workload, the contribution from fat oxidation increases in exercise-trained subjects Klein et al. Am J Physiol 267:E394, 1994. What happens to plasma fatty acid levels with aerobic training? untrained individuals, fatty acid in the plasma goes way up -in trained individuals, it doesnt go up as high BUT they still oxidize more than untrained, how is that possible? untrained trained Klein et al. Am J Physiol 267:E394, 1994. So, trained individuals use more total fat during aerobic exercise, but they have lower circulating FFA levels - is this right? Sure - for two reasons: 1. This simply illustrates a possible shift from where the fat comes from: •  i.e. less dependency on plasma FFAs, but a greater dependency on intramuscular TGs 2.  Don't be too sure tha...
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This note was uploaded on 11/14/2013 for the course NUTR 4210 taught by Professor Guelphuniversity during the Fall '13 term at University of Guelph.

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