Lactate + VO2 max Flashcards
Difference between lacate and lactic acid
Lactic acid disassociates from H+ (increasing acidity) and binds with K or Na to form lactate salt
How is lactate formed and how does it affect the muscles
Lactic acid releases H+ and binds with sodium or potassium to form lactate salt
Increasing H+ conc slows enzyme activity, causing muscular fatigue as glycogen cannot be broken down
What is OBLA and what conc does it occur
OBLA is an overwhelming build up of lactate
At OBLA, the conc is 4mmol per litre of blood
What is the concentration of lactate at rest
1-2 mmol per litre
What can measuring OBLA tell us about a performer
Their endurance capacity
What can delaying OBLA lead to
Performer works harder for longer
OBLA is a result of moving from aerobic to anaerobic
What is lactate threshold
The maximum intensity that can be worked before OBLA sets in
What is the relationship between VO2 max and lactate threshold
Lactate threshold can be expressed as percentage of VO2 max
Directly proportional
Factors affecting rate of Lactate accumulation
Exercise Intesnity
Muscle fibre type
Rate of blood lactate removal
Respiratory exchange ratio
Fitness of performer
VO2 max of performer
What factors affect VO2 max
Physiological
Training
Genetics
Age
Gender
Body composition
Lifestyle
What is VO2 max
Maximal amount of O2 that can be taken up and utilised by our muscles per minute
What are the 4 measurements of energy expenditure?
Indirect calorimety
VO2 max test
Lactate sampling
RER
What does RER stand for?
Respiratory exchange ratio
What are the physiological characteristics of an athlete with a high VO2 max?
Increased stroke volume
Greater HRR
Increased RBC count
Increased cappilarisation
Increased number and size of mitochondria
Increase alveoli surface area
Increased lactate tolerance
