Human Energy Systems. NFSC 303. You will not be required to do the mathematical conversions from one for of energy to another (p. 83-85 of textbook). Energy Balance = “energy in” vs. “energy out” Energy in: Energy out: . How do we measure Calories?. Direct Calorimetry: In food:
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Human Energy Systems
NFSC 303
Energy Balance = “energy in” vs. “energy out”
Energy in:
Energy out:
To estimate BEE:
Men:
Women:
Example:
Total Daily Energy Expenditure (kcals)
TEE
TEF
Remember: BMR is measured 12 hours after any physical exercise and in a fasted state.
BEE
Fueling Activity
A-P~P~P
High-energy bonds “store” energy
Cleaved to release E for
A-P~P /P = ADP
A-P/ P = AMP
To regenerate ATP, we need a source of P with high energy bonds:
ADP + P
AMP + 2P
These high-energy bonds will come from:
Overview of Pathways
So to fuel activity, we need ATP.
ATP is generated by metabolizing our fuel sources: carbohydrate, fat, and some protein.
So how much of each fuel do we use during exercise? (What’s the fuel mix for a given exercise?)
Remember: only CHO can be burned when oxygen availability is low
FAT
CHO
rest
TIME