Lecture 3 - Overview of exercise metabolism Flashcards Preview

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

What are the ATP dependent processses in skeletal muscle

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

Fatigue is often related to disturbances of the..

Na+ K+ balance

3

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

wet , as opposed to dry

4

many of the metablic pathways are sensitive to...

the level of ATP

5

If you inject ATP into muscle what happens?

the metabolic pathways are deactivated

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

6

Fats can only be...

oxidised

7

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

Exercising ALOT or starving

8

PCr + ADP + H+ -->

ATP + creatine

9

2ADP --->

ATP + AMP

10

Glycogen + 3ADP + 3P(i) --->

2 Lactic acid + H+ + 3ATP

11

What is the power of the energy systems?

The rate of generating ATP

12

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

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

13

The energy systems used at onset of exercise are

PCr and Glycolysis

14

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

occlude the oxygen supply by compresssing the capillaries

will start to rely of Creatine phosphate and other anaerobic substrates

15

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

power output / exercise intensity

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

16

true or false

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

False

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

17

over time, muscle glycogen ____ as an energy source

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

18

What are the main factors influencing exercise metabolism?

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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