Training Px for anaerobic adaptations Flashcards
Where is creatine kinase found in a muscle fibre and why?
- Mitochondria
- Site of ATP creation
- ATP can be used to create PCr
- Longer recovery, increased PCr creation
What reaction does Adenylate Kinase catalyse? Ad why is it important?
- ADP+ADP->ATP+AMP
- AMP is a strong signal for metabolic process
What is the role of glycogen phosphorylase?
- Breaks down glycogen
- B form inactive, a form active
What is the role of PFK?
- Glycolysis rate limiter
- Activated by AMP
- Regulates glycolytic flux
What is the acute response to single sprint exercise?
- Glycogen depletion (from glycogen phosphorylase)
- Slight drop in ATP
- No change in ADP or AMP
- Dramatic PCr reduction
What was the contribution % for 6 second sprint?
- Mainly PCr and glycolysis
Why is power affected in repeated sprints?
- Reduced PCR
- Increase H+
- Impairment of enzyme function
What is the acute response to repeated sprint exercise?
- Large drops in glycogenolytic rate
- Large drops in Glycolytic rate
- Decrease in glycogen degradation
How does the % contribution react to repeated sprints?
- Lower glycolysis contribution
- 80% PCr contribution
How does increased mitochondria help sprinting?
- More mitochondria = more ATP
- More ATP = quicker PCr creation
What is responsible for the acute glycolytic response to repeated sprint exercise?
- Reduced GP& PDK activity
- Reduced glycogen availability
- Increased G6P in blood from liver
- Decreased glucose concentration gradient
What happens to energy system contribution at 20-30s sprint?
- More dependent on aerobic system
What adaptations would you expect to see from repeated sprint training?
- No change in GP or LDH activity
- Increase PPO and work done
- Increased hexokinase & PFK activity
Does sprint interval training improve VO2max & oxidative metabolism?
- Stressing mitochondria to generate ATP aerobically
- Increase in oxidative enzymes
What activates glycogen phosphorylase?
Epinephrine
Ca2+
AMP
