Anaerobic Performance Flashcards
What happens to our stored PCR at the onset of light intensity exercise?
Consumed to a level commensurate w/ intensity of exercise
Following a 30s all-out sprint, how much would PCr be expected to recover in 15-minutes (as a % of resting values)?
100%
What is a potent stimulus for an increase in aerobic respiration?
ADP conc.
Which muscle fibres are more adept at consuming PCR?
Type 2
What test did Vanhatalo and Jones (2009) use to examine the impact of prior exercise on the power profile of very high intensity exercise?
3-min all-out test
What did Kindig et al 2005 investigate
Impact of the inhibition of creatine kinase on muscle performance
What are the 2 high-energy phosphates stored WITHIN muscles?
ATP
PCr
How many moles of ATP and PCr does 1kg of skeletal muscle store?
5 mmol ATP
15 mmol PCr
Which enzyme triggers PCr hydrolysis to resynthesize ATP in order to regulate phosphagen breakdown rate?
Creatine kinase
During intense exercise, what provides as the energy source to phosphorylate ADP during anaerobic glycogenolysis to form lactate?
Intramuscular stored glycogen
What prevents “net” lactate build up?
Removal by heart muscle + nonactive skeletal muscle.
For a healthy, untrained person, when does blood lactate begin to accumulate + rise in an exponential manner?
At about 50-55% of max capacity of aerobic metabolism.
What factors are related to ones lactate threshold?
Tissue O2
Glycolysis
Fast-twitch muscle fibres
Lactate removal
Equation for the ON-SET / START of exercise
ATP –> ADP + Pi + energy
Equation for the OFF-SET/REDUCTION in exercise intensity
PCr + ADP –> Cr + ATP
What is the 1st system to ALWAYS respond when theres an increase in energy requirement due an an increase in exercise intensity?
ATP-PCr system
How is the replenishment of ATP achieved?
Through the breakdown of PCr
To how much can a max 6s all out sprint reduce PCr?
To 35-55% of resting levels
- Complete recovery can take 2-5mins.
How is the recovery of PCr levels quicker in young and healthy individuals and in endurance athletes?
As the recovery takes place through AEROBIC pathways
How are the recoveries of power output and PCr resyntehsis similar?
Their recovery follows a similar time course.
What is peak power output during all out exercise dependent on?
Intramuscular PCr content
What is a key determinant of the work capacity during all-out exercise?
Intramuscular PCr
Which athletes tend to have a lower fatigue index?
Endurance athletes a.k.a those with lots of type 1 fibres
What does a fatigue index show
Diff between peak + min power
What does it mean if an individual has a low fatigue index
Means theres less of a difference between peak + min power.
What is the Wingate Anaerobic Power test designed to measure?
The high-intensity anaerobic component of energy transfer.
What does the computer software calculate in the Wingate anaerobic power test?
Power output
Max value
Average over the 30 secs
What do inter-individual variations in the % change in peak power in the 1 min bout indicate?
Differences in rates of PCr resynthesis - those who had recovered more have a better maintenance of peak power.
Assuming Pcr has completely recovered in the 10 min bouts, what are potential explanations for the reduced peak power in some individuals in this condition?
Accumulation of metabolites implicated with fatigue, that have potentially had an impact on muscle function (H+, and Pi).
What are the explanations for an increased peak power in some individuals in the 10 min condition?
The priming (warm-up) effect - likely alterations in enzyme activity resulting in an alleviation of metabolic inertia at the onset of exercise.
+ there could be a bigger + more uniformed recruitment of muscle contributing force production at exercise onset.
What are potential explanations in min power changes in the 1 min bout vs the 10 min bout?
1 min bout would have had lower PCr + pot. greater amount of H+ + Pi.
10 min bout would likely be underpinned by factors affecting muscle function, or red. in muscle glycogen that would have occurred following the 1st bout.
What insight does the fatigue index provide into an individual’s physiology? (i.e. what do greater or smaller values for F.I indicate?)
Greater values = usually ind who are ‘anaerobically’ trained- have a higher peak, but a more pronounced drop off in power.
Smaller peak = Endurance trained athletes but better able to maintain power throughout test = less of a diff between max + min powers.
