Energy Sources Flashcards
Energy
Capacity to do work (FxD)
Kilo Calorie
Heat necessary to raise the temperature of 1 kg of water 1 degree Celsius
Six categories of nutrients
Carbohydrates, lipids, proteins, vitamins, minerals, and water
Vitamins
Micronutrient - Organic and can be broken down by heat, air, or acid
Minerals
Micronutrient - Inorganic and hold on to their chemical structure
Strong Bones
Combination of calcium, vitamin D, vitamin K, magnesium, and phosphorus
Prevents birth defects
Take folic acid supplement early in pregnancy. Prevents brain/SC defect in offspring
Protect teeth
Fluoride
Forms of energy
- Chemical
- Electrical
- Heat
- Mechanical
Plants convert sunlight to what
Carbohydrates
Rapid, readily available source of energy
Carbohydrates
3 forms of carbohydrates
- monosaccharides
- Disaccharides
- Polysaccharides
Monosaccharides
glucose, fructose, galactose
Disaccharides
maltose, sucrose
Polysaccharides
starch, cellulose, glycogen
Glycogenesis
Formation of glycogen from glucose
Glycogenolysis
breaking down of glycogen into glucose
what is the most useful simple carbohydrate
glucose
Where are simple carbohydrates found?
Foods that are refined and packaged, such as sugar, honey, milk, and fruit juices (quick energy)
Daily percent of calories from fat
20
Daily percent of calories from carbs
50
daily percent of calories from proteins
30
Kcal from carbs, fat, proteins
4 kcal/g
9 kcal/g
4 kcal/g
Do you produce lactic acid during ATP-PC system utilization?
No. because you are not using glucose at all
Plants convert sunlight to what?
Carbohydrates
Glucose is stored as what for later use?
Glycogen
Can tissues use glycogen
No must be broken down to glucose so the blood can carry it to tissues.
Atoms in carbohydrates
C, H, O
Most useful and simple carbohydrate
Glucose
Approx how much liver glycogen
100 grams
Approx how much muscle glycogen
400 grams
Long distance runners can store more of which type of glycogen
May store up to 700-800 grams of muscle glycogen
Sprint of 100 m shetty vs. bolt. Using the same energy system?
No. Shetty is using ATP-PC (anaerobic) Bolt is using aerobic
What source of energy is used in high intensity activities?
Carbohydrates/glucose
If you eat extra fat how is it stored
Stored as triglycerides
Chemical Structure of glucose
C6 H12 O6
Chemical structure of fat
C16 H32 O2
Energy consumption at rest (fat vs carbs
2/3 from fat
1/3 from carbs
saturated fat comes from where?
animal sources
unsaturated fat comes from where?
plant sources
Palmitic acid is an example of what type of energy source?
fat
Role of lipids in the body
- Energy source and reserve
- Protection of vital organs
- Thermal insulation
- Vitamin carrier
How many essential AA
- Must be ingested by food. Cant be synthesized
How many unessential AA
- Can be synthesized in the body
catabolic reaction
break down substrate into molecules
Anabolic reaction
forming a product from molecules
Can energy liberated through breakdown of food be used directly for work?
No. must go through ATP
Where does energy for muscular contraction come from
Breakdown of ATP
Where is ATP located to make muscle contraction
Located in cross bridges of muscle. Move muscle contraction when broken down
What is an immediate substrate that helps put ATP together
CP. Enzyme that combines with energy
ATP-PC do you deposit lactic acid?
No because you are not depositing glucose
What system is being used when you deposit lactic acid
Anaerobic glycolysis
Products of aerobic metabolism
CO2 and H2O
When is aerobic metabolism used?
rest, long duration exercise, low intensity activity
Products of anaerobic metabolism
CO2, energy, and lactic acid
What does lactic acid cause
decreases production of useful energy, diminishing intensity or speed of activity
Major energy source used during high intensity short duration activities
anaerobic metabolism. Lifting/sprinting
Energy source used in anaerobic metabolism
carbohydrates
Amount of energy produced by ATP-PC
7-12 kcal. lasts about 2-3 seconds
does sprinter or long distance runner replenish ATP faster?
sprinter
How to increase ATP-PC concentrations
short duration, high intensity activities
Once activity ceases what happens to ATP
hydrolysed to rebuild muscle stores
Approx amount of blood glucose
20 grams
What is the rate limiting enzyme in anaerobic metabolism
PFK
How many ATP produced with anaerobic glycolysis
2-3 ATP
PFK glucose converts to what in anaerobic glycolysis
pyruvic acid - then goes to lactic acid
Where does the krebs cycle take place
mitochondria
Substrates in aerobic metabolism
fat, carbs, protein
substrates in anaerobic metabolism
carbohydrates
where does anaerobic glycolysis take place?
cytoplasm (intracellular fluid)
Function of NAD and FAD
Electron carriers in the krebs cycle
Aerobic system: oxidation
Removal of hydrogen ions form substrates. Electrons are removed
Aerobic System: reduction
Ions and electrons are to be carried to the mitochondria for energy production. NAD (vitamin B) and FAD
How many ATP are produced by NAD and FAD
3 - NAD
2 - FAD
PRODUCED IN MITOCHONDRIA
Where does glycolysis take place
cytoplasm
Amount of ATP produced during aerobic glycolysis
36
Type of training to increase IM glycogen stores?
endurance training. Also increase the intensity of the activity aerobic metabolism
Oxidative phosphorylation
production of ATP by ETC
How many times does fat have to go through the krebs cycle to hydrolyze that molecule
may take up to 16 times
How much of the air you breath in is O2
20%
How much you breath out is O2
16%
Equation of minute ventilatoin
minute ventilation = RR x tidal volume
Approx avg. tidal volume
500 mL
Approx RR
10 breaths per min
Approx minute ventilation
5000 mL/min
Amount of air inhaled that is O2 dense
1000mL/min
Amount of air exhaled is O2
800 mL
Amount of air inhaled and used (O2)
200mL
approx amount of blood in body
5L
Blood lactate
10 mg x dL
how much lactic acid produced from blood lactate?
5 grams
What determines that type of energy system used
intensity and duration
RQ value for carbohydrates
1
RQ value for fats
0.70
RQ value for proteins
0.80
As intensity goes up on stress test what is RQ approaching and what energy substrate is used?
Approaching 1 and using carbohydrates
RQ values during rest
0.82
How much O2 needed to lift 1 kg
1.8 mL
if you lift 1 kg 3 times how much O2 is needed?
5.4 mL
Factors resulting in switch of metabolic substrate used for rest vs. exercise
- carbohydrate metabolism produces more energy per liter of O2
- More fast twitch muscle fibers are recruited
- Hormonal changes (increase in epinephrine)
Lactate threshold
exercise intensity at which blood lactic acid exceeds resting concentration
Lactate threshold in untrained individuals
50-60% max O2 consumption
Lactate threshold in trained individuals
65-80% max O2 consumption
Aerobic metabolism at its best
- increased mitochondria density and volume
2. Increased blood supply
Resting O2 consumption
3.5 mL/kg/min
1 MET
3.5 mL/kg/min
Direct calorimetry
measuring heat production to determine metabolic rate
Indirect calorimetry
Using oxygen utilized, CO2 produced, & their ratio to calculate metabolic rate
Resting energy use
- basal metabolic rate
2. resting metabolic rate
1 L of oxygen produces how many kcal of energy?
5 kcal
What does RQ =
V carbon dioxide/ V Oxygen
1kgm = how much oxygen
1.8 mL
Resting value for RQ
0.82
Energy production for steady-state
aerobic metabolism
Main source of energy for 3 second sprint
Intramuscular PC and ATP
As blood lactate increases what happens to the pH
Decreases - more acidic
Lactic acid tolerance
60-70grams
How many kcal used for 1 ATP
10kcal
What system is used during oxygen debt?
Anaerobic contributes
MET
minimum level of energy required to sustain body’s vital functions in resting state
The greatest amount of fat use occurs at what amount of aerobic capacity (VO2max)
60%
how many mets for walking up stairs
4.5
how many mets for walking
3-4
how many METS for sprinting
12-15
Lactate accumulation occurs at about how many METS
6
Blood pressure changes per MET increase
5-10 change in systolic blood pressure. Diastolic pressure should remain the same or slightly decrease
Alactaid
Recovering ATP-PC
Lactacid
removal of lactic acid
Duration for muscle glycogen replenishment
10 hours - continuous exercise
5 hours - intermittent exercise
Restoration of O2 stores
10-15 seconds (plasma,myoglobin)
Restoration of phosphagen stores
2 minutes
High blood lactate threshold
- Slow twitch fibers
- High VO2 max
- High capillary density and mitochondria
Fate of Lactic acid
- Excretion in urine
- Conversion to glucose - need O2
- Oxidation to CO2 and H2O
Pulmonary circulation
Blood from heart to lungs and back to heart
Peripheral circulation
Blood from heart to body and back to heart
Arteries
Large vessels that carry blood away from the heart
Arterioles
small branches of arteries
Capillaries
smallest vessels - site of gas exchange
veins
vessels that carry blood to the heart
Venules
small veins that carry blood toward the heart
Venous blood
blood returning to heart
Arterial blood
blood leaving the heart and going to the body or lungs
2 Atrioventricular valves
- Tricuspid (R)
2. Bicuspid (L) - mitral
2 Semilunar
- Pulmonary (R)
2. Aortic (L)
Pericardium
tough, membranous sac that encases the heart
blood flow from R ventricle to L atrium
Through pulmonary trunk, to pulmonary artery, to lungs, to pulmonary vein, to L atrium
Anastomosis
intercommunication btw 2 arteries ensuring blood flow to area even if one artery is blocked
Major arteries are located where
on the outer surface of the heart, so that they aren’t compressed during contraction
Where is blood pressure the highest
Aorta
Systole
Contraction phase (blood pumped out of chamber
Diatole
Blood fills chamber
Pacemaker of the heart
SA node (sinoatrial)
What delays the impulse by 1/10 of a second allowing atria to contract before ventricle
Atrioventricular node
Purkinje fibers
rapidly spread impulse to contract through ventricles
Diastole trained vs. untrained
Longer in trained - decreases HR
Parasympathetic nerve fibers of the heart
decrease HR
sympathetic nerve fibers of the heart
Increase HR
Bradycardia
slow HR - often training induced
Metabolism of the heart
Uses aerobic metabolism - NO LACTIC ACID
Regular physical training and chronic HTN
- Thickening of L ventricle wall
2. increase in L ventricular mass
Impulse transmission pathway
SA-AV-Bundle of His-Purkinje fibers
How long does it take for one cardiac cycle
0.80 seconds
What is happening during atrial depolarization?
Atrial contraction
What is happening during ventricular depolarization
Ventricular contraction and atrial relaxation
what is happening during ventricular repolarizaiton
ventricular relaxation
How does duration of the cardiac cycle change during exercise
Diastole time decreased so the time per cardiac cycle is decreased. Increased HR
how do you determine cardiac output
SV x HR
What is stroke volume
amount of blood pumped per contraction of the ventricles
Typical cardiac output for men and women
5 L/min for men and 4.5 L/min for women
Resting cardiac output trained vs untrained
same… Trained however have a lower HR and higher SV
End Diastolic Volume
blood in ventricles at end of diastole
End Systolic Volume
Blood in ventricles at end of systole
SV equation
SV = EDV - ESV
Ejection fraction equation
(SV/EDV) * 100… tells you how efficiently the heart is working
Higher ejection fraction does what to fatigue
Reduced fatigue
Endurance training EDV, SV, HR
- Increased EDV
- Increased SV
- Decreased HR
Moderately/untrained people SV increases at what exercise intensity
40-50% peak O2 consumption
What happens to SV at high intensity levels
Decreases