Week 3 - Energy, Enzymes, Food & Ergometry Flashcards
Define law 1 of thermodynamics
Energy can’t be created nor destroyed but simply changed from 1 form to another.
== Conservation of Energy in living + non-living things.
Define fuel
“Compound for which some of its chemical energy can be transformed into other forms when a chemical reaction takes place”.
What is glycogen stored with?
1g of glycogen w/ 3g H20.
Where is triacylglycerol stored
Adipose tissue
Occupies about 80% of adipose tissue
What does the total energy of a system relate to?
Pot + KE
Define chemical energy
Type of pot. energy stored in bonds of comp. + mol.
Define law 2 of thermodynamics
= All of the pot. energy in a system degrade to the unusable form of KE or heat energy.
Process of change reflects entropy.
What is 1 joule of energy
Energy expended when 1 newton moves 1m.
How many joules is 1 megajoule
1,000,000 J
How many kJ is 1kCal
4.184kJ
How many kCal is 1kJ
0.239kCal
How many kCal are there per g of CHO - GROSS
4.2
How many kCal are there per g of Protein - GROSS
5.65
How many kCal are there per g of lipid - GROSS
9.4
How many kCal are there per g of CHO - NET
4.2
How many kCal are there per g of protein - NET
4.65
How many kCal are there per g of lipid - NET
9.4
What do bomb calorimeters measure?
Gross energy value of macronutrients
What does direct calorimetry measure
Heat liberated as food burns
Reversible reactions properties
Small energy change
Equilibrium reaction
More common
Irreversible reactions properties
Large energy change
Non-equilibrium reaction
Less common
Cadence
Speed of legs
Calculation to work out work (J)
Work (J) = Force (N) x Distance (m)
How to calculate force (N)
Force (N) = Mass (kg) x Acceleration (m/s^2)
How to calculate Power (W)
Power (W) = work (J) / Time (s)
