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Flashcards in ATP-PC Deck (32)
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0
Q

ATP PC system

A

High power/low capacity
Peak power 0.1-3 seconds
Low capacity - resting levels of PC and ATP in the SR can give energy for 8-12 seconds during intense activity

1
Q

2 pathways of ATP PC

A

Creative kinase

Myokinase rxn

2
Q

Max speed in a sprint

A

cannot be maintained throughout the run

3
Q

Phosphocreatine storage numbers compared to ATP

A

3-6 times more store than ATP
ATP 6mmol/kg muscle about 3g/kg
PC 18mmol/kg about 3.8 g/kg

4
Q

Muscle fibre and PC storage

A

Fast twitch have more PC than slow twitch muscle fibres

5
Q

Creatine storage

A

60-70stored as phosphocreatine, rest as creatine

6
Q

Is PC a high capacity energy source?

A

No

7
Q

The PC in an ind with 20kg active muscle is enough for

A

5-8 second sprint
1 min brisk walk
20-30 s marathon run

8
Q

What is the lohmann reaction?

A

ADP + PC + H = ATP + creatine
Creatine kinase catalyzed breakdown of PC releasing energy needed to resynthesize ATP from ADP and Pi
Hydrogen is recycled from the hydrolysis of ATP so no decrease in pH
Reaction occurs in sarcoplasm, easily reversible

9
Q

Myokinase / adenylate kinase reaction enhances 2

A

Power of ATP PC to 5 seconds
Capacity of ATP PC to 15 seconds
ADP+ADP = AMP+ATP

11
Q

Evaluation of ATP PC anaerobic power with technology

A

Phosphorus NMR 31 spectroscopy
Non invasive to measure ATP and PC concentration with exercise
Very expensive
Put them in MRI and look at phosphate properties with MVIC as inorganic phosphate would accumulate with anaerobic
Difficult to measure changes in ATP PC in Vivo

12
Q

field tests for ATP-PC anaerobic power (4)

A

Vertical jump test - force platform for actual power calculations (some from PC)
Margaria-Kalamen test - test for alactic power
- switch mats/photoelectric cells are essential for accuracy
Short running springs (30m)
Wingate peak power
- peak 5 second power during 30 second wingate test (usually first)

13
Q

Time frame for training the ATPPC system

A

15 seconds or less

- not giving it enough time to recover

14
Q

ATPPC training adaptations (4)

A

increased ATPPC turnover
-increased ATPase activity -30%
-increased myokinase activity -20%
-increased creatine kinase activity - 30-55%
increased ATPPC storage
-increased 40% cellular PC
-small increase in ATP
decreased depletion of ATP and PC at same absolute workload
no change in ATP and PC depletion at same relative workload

15
Q

How does ATPPC training increase in your 1RM

A

level of intensity increases as you train

16
Q

Production of creatine

A

endogenously by liver, kidney, pancreas, brain and testes from AA(arginine, glycine, methionine)/consumed from fish/meat

17
Q

to maintain creatine levels

A

2g/day(1 from body 1 from food) for normal muscle creatine levels
(1kg red meat = 5g creatine)

18
Q

who has low levels of muscle creatine?

A

vegetarians

19
Q

what do people take as creatine supplements?

A

creatine monohydrate

20
Q

4 rationales/claims for creatine’s ergogenic effects

A

increase PC and power and capacity of ATPPC which gives speedy recovery from short but high intensity activity
more hydrogen molecules sequestered during the creatine kinase reaction limiting decrease in pH
ATP can only fall to about 30 % but PC can fall to almost zero
increase lean body mass

21
Q

Creatine supplementation protocol

A

loading - 20g/day for 5-7 days (0.3g/kg/day)
- could give you greater than 30% retained intramuscular PC

Maintenance - 3-5g/day 1wk-6m

22
Q

Excess creatine

A

turned into creatinine and excreted

23
Q

Creatine supplementation most effective for

A

repeated bouts of high intensity strength and sprint exercise

24
Q

creatine supplementation show low increase in

A

max speed/power

25
Q

How many do not respond to creatine supplementation and why?

A

20-30%

  • responders are ones that have low levels of creatine like vegetarians and those who consume low lvls of animal protein
  • if you have lower % fast twitch muscle fibers
  • PC store only increases from 10-30 %
26
Q

creatine and muscle hypertrophy?

A

no clear evidence

- potentially increased lean mass - indirect effect of increased work capacity

27
Q

Is creatine safe?

A

yes

28
Q

weight gain and creatine

A

up to 3kg

- may be ergolytic depending on sport - occurs quickly in first 1-2 days, mostly due to water retention

29
Q

3 adverse effects

A

stiff muslces
endogenous production of creatine stops but appears to resume after supplementation stops
possible contamination with undeclared banned substance

30
Q

creatine and renal function

A

no known adverse affects, but can impair in ind. with pre existing kidney problems

31
Q

most effective sports for creatine supplementation

A

football/hockey for your small rests in between bouts

32
Q

creatine and short track events

A

no but during off training