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From what 4 sources can fat be used from?
-fat consumed during exercise
WHICH type of fat is the largest reservoir of stored energy?
adipose tissue fat
7 determinants of amount and source of fat used during exercise
-type of exercise
-intensity and duration of exercise
-available fat reserves in the msucle
-ability to mobilize the adipose tisue to the musces
-composition of the meal prior to exercise
-availability of carbs or stored
6 Steps to lipolysis
-breakdown of fat in adipose or muscle tissue to create FFAs and glycerol
-when exercise begins, SNS stimulates production of epinephrine
-Epinephrine activates cAMP
-cAMP activates hormone sensitive lipase
-HSL^^ splits off 2 fatty acids from glycerol backbone to produce monoglyceride
-monoglyceride lipase (MGL) removes remaining FA
After lipolysis, how does mobilization and transport of FFAs within the fat cell?
FFAs cross the adipose cell membrane passively or are transported out by fatty acid binding protein FABP or fatty acid translocase FAT
transport of FFAs in the blood
-FFAs released into blood are bound to albumin and transported to the working muscles
Transport of FFAs into the msucle cell
FFAs are released from albumin and actively transported across the muscle membranes
after transport of FFAs into muscle cell, what 2 events happen?
-transport of FFAs to the muscle mitochondria
-oxidation of energy via the TCA cycle
what are 2 effect of exercise on lipolysis?
-during exercise the rate of lipolysis far exceeds the need for FAs for oxidation by the muscles
-immediately after exercise, 90% of the FAs released are re-esterified
Which is the strongest inhibitor of lipolysis?
During exercise, why does insulin concentration decrease?
epinephrine and norepinephrine inhibit the release
whats an advantage of having stored triglycerides within muscle tissue?
the close proximity to the mitochondria
Blood lipids metabolism) waht transports them?
Blood lipids metabolism) are blood lipids a large or small contributor to energy during exercise?
-most people do not exercise strenously after eating a large meal
what are 3 ways to enhance fat oxidation?
what are 4 adaptations that ocur with exercise training?
-improves the ability to use more energy from fat and less from carbs
-enhances the body's ability to oxidize fat as fuel
-improve intramuscular fat storage
-increase fat flux
Who has maximum fat oxidizing capabilities at higher intensities, trained or untrained individual?
Has current research shown any advantage for having a high fat diet?
Description of long chain triglycerides
-3 long chain fatty acids and a glycerol backbone
why Is it not recommended to consume long chain triglycerides before workout?
they are slow gastric emptying thus they stay in GI tract longer and enter into blood stream slower
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