Energy transfer during short duration/High intensity exercise Flashcards
What causes lactate accumulation
Lactate accumulation occurs when there’s not enough oxygen in the muscles to break down glucose and glycogen.
Lactate threshold
The point during exercise at which lactic acid quickly accumulates in the blood
What does OBLA stand for
Onset Blood Lactate Accumulation
OBLA
The point when lactate levels go above 4 millimoles per litre
What does measuring OBLA give an indication of
Endurance capacity
How is lactate threshold expressed
Percentage of VO2 max
Why does training have a limited effect on VO2 max
Because it is genetically determined
What happens to out lactate threshold teh fitter we are
The fitter we are, the higher our lactate threshold as a % of VO2 max and hence the harder we can work
What test can measure OBLA
Multi stage fitness test
What are the 5 factors that can affect the rate of lactate accumulation
- Exercise intensity
- Muscle fibre type
- Rate of blood lactate removal
- Respiratory exchange ratio
- Fitness of the performer
How does exercise intensity affect lactate accumulation
The higher the exercise intensity, the greater demand for energy and the faster OBLA occurs
How does muscle fibre type affect lactate accumulation
Slow twitch muscle fibres produce less lactate than fast twitch fibres
How does rate of blood lactate removal affect lactate accumulation
If lactate production increases, then lactate will start to accumulate in the blood until OBLA is reached
How does respiratory exchange ratio affect lactate accumulation
When glycogen is the preferred fuel, this ratio has a value close to 1:0 and there is a greater chance of the accumulation of lactate
How does fitness of the performer affect lactate accumulation
A person who trains regularly will be in a better position to delay OBLA as adaptions occur to trained muscles (Increased mito and myoglobin)
