Lecture 3 - Overview of exercise metabolism Flashcards Preview

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Flashcards in Lecture 3 - Overview of exercise metabolism Deck (18)
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1
Q

What are the ATP dependent processses in skeletal muscle

A

Cross-bridge cycling (myosin ATPase) - takes up the most energy

Sarcolemmal excitablity (Na+ / K+ ATPase) - depolarising and re-polarising

Calcium pumping into SR (SERCA - Ca2+ ATPase)

2
Q

Fatigue is often related to disturbances of the..

A

Na+ K+ balance

3
Q

because muscle is about 70% water there’s about a 4-fold increase in concentration when it’s reported as

A

wet , as opposed to dry

4
Q

many of the metablic pathways are sensitive to…

A

the level of ATP

5
Q

If you inject ATP into muscle what happens?

A

the metabolic pathways are deactivated

ATP levels are the regulating variable - if depleted, you turn on the metabolic pathways

6
Q

Fats can only be…

A

oxidised

7
Q

Protein is only used in the oxidative metabolism when the subject is

A

Exercising ALOT or starving

8
Q

PCr + ADP + H+ –>

A

ATP + creatine

9
Q

2ADP —>

A

ATP + AMP

10
Q

Glycogen + 3ADP + 3P(i) —>

A

2 Lactic acid + H+ + 3ATP

11
Q

What is the power of the energy systems?

A

The rate of generating ATP

12
Q

The power of the system is inversely related to the ..

A

capacity of the system - how long it can sustain ATP production

13
Q

The energy systems used at onset of exercise are

A

PCr and Glycolysis

14
Q

The heavier the weight lifted in resistance training, the more likely you will

A

occlude the oxygen supply by compresssing the capillaries

will start to rely of Creatine phosphate and other anaerobic substrates

15
Q

In aerobic exercise the oxygen uptake is linearly related to the …

A

power output / exercise intensity

once gone above the maximum, need to start using anaerobic systems

16
Q

true or false

Fat sources for energy expendture are at the highest proportion of fuels used during maximum exercise intensity?

A

False

make up a higher proportion of energy expendature in medium intensity exercise

17
Q

over time, muscle glycogen ____ as an energy source

A

decreases as an energy source, fat oxidation and glucose usage go up

18
Q

What are the main factors influencing exercise metabolism?

A

intensity and duration

diet - high carb high = more carb consumption

training

Environmental temperature - hot conditions tend to burn more carbs

Age and gender - older you get the more you burn fat (exercise intensity is increase)
Women tend to oxidise more fat than men, thought to be due to oestrogen

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