VO2 max and OBLA
- Created by: phie_collinsx
- Created on: 26-03-15 13:37
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- VO2 max
- Maximum oxygen consumption attainable during maximal work
- Affecting Factors:
- Age
- Gender
- Genetics
- Training Intensity
- Amount of haemoglobin in the blood
- Amount of capillaries around the lungs and the working muscles
- Maximum volume of oxygen that can be consumed during maximal workout
- For training aimed at improving a performer's VO2 max using the aerobic system:
- The work - relief ratio is normally longer in duration and intensity, just below the anaerobic threshold.
- The relief ratio is typically shorter (ratio 1:1), which helps reduce the OBLA and delay muscle fatigue and therefore prolong the aerobic system adaptations
- VO2 = Volume of oxygen consumeed
- APPLY IT: some elite marathon runners and cross country skiers can perform at up to 90% VO2 max without significant lactic acid production (OBLA)
- OBLA = stands for ONSET OF BLOOD LACTATE ACCUMULATION
- This means the point at which the muscle can no longer get rid of the lactic acid and it begins to pool in the blood
- Normal amount of lactate in the blood = 1ml/kg
- OBLA occurs at = 4ml/kg
- If the intensity of the activity increases, the performer will have to switch from using aerobic capability to anaerobic which results in increased lactate build up
- OBLA occurs at = 4ml/kg
- Once the blood contains four times as much lactic acidd as normal, it can NO LONGER OPERATE THE ENERGY SYSTEMS EFFECTIVELY and the body begins to slow and eventually fail
- The affects of OBLA:
- Stops oxygen being collected by the haemoglobin
- Causes the pH of the blood to rise causing pain in the working muscle
- Also decreases the amount of oxygen that can be used for phosphorylation
- Will eventually lead to the muscle failing - YOU WILL COLLAPSE!
- Average person reaches OBLA at 40% of VO2 max - meaning that the average person can only work at less than half their maximum ability before fatigue sets in
- OBLA = stands for ONSET OF BLOOD LACTATE ACCUMULATION
- The amount of oxygen the body can take in and use in one minute
- Why? - Gives an accurate idea of how well a person's body can perform over a long period of time OR the intensity in which they will be able to perform
- Training effects
- Increased haemoglobin
- Increased OBLA
- Factors affecting OBLA
- Muscle fibre type being used
- Training adaptations to exercise
- Intensity of exercise
- Factors affecting OBLA
- Reduced body fat (therefore less oxygen being used for the energy systems
- Increased cardiac output and stroke volume
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