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Investigating Oxygen Debt during aerobic & Anaerobic exercise.

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Introduction

INVESTIGATING OXYGEN DEBT DURING AEROBIC & ANAEROBIC EXERCISE Introduction During this experiment I am aiming to investigate the oxygen debt in two people after exercise. During exercise energy is needed in the muscles. Energy comes from food which is converted into glucose and for the most efficient energy supply muscles also need oxygen. When energy is produced using oxygen this is called aerobic respiration. The formula for aerobic respiration is: glucose + oxygen = carbon dioxide + water + ENERGY During aerobic respiration the waste products are carbon dioxide. Carbon dioxide is carried away in the blood and water is taken away by sweating from the body. When muscles do extra work more oxygen and glucose is needed, so more blood must be pumped to the muscles causing the heart to beat faster. Eventually more oxygen is needed in the muscles than is being inhaled by the lungs so the muscles begin to work anaerobically. This means oxygen is no longer used in the equation and the glucose forms lactic acid. The formula for anaerobic respiration is: glucose = lactic acid + ENERGY During anaerobic respiration the waste product is lactic acid. Lactic acid is a poison and causes muscle ache and eventually cramp. Lactic acid burns up some of the energy being produced, therefore anaerobic respiration only produces half the amount of energy that aerobic respiration does. ...read more.

Middle

540m Long Distance - Aerobic Anaerobic For this experiment we measured out a square with 45m sides and then this was to be completed 3 times to have a complete distance of 540m. As soon as each runner had completed the course they immediately took their pulse rate for 15 seconds and then multiplied this by 4. After 1 minute we recorded their pulse rate and continued this at 1 minute intervals till it returned to their resting pulse rate. This test was only performed once as if it was done 3 times the runners would become tired affecting their results and it would not be a fair test. Results On graph paper Conclusion & Evaluation By looking at my results I am able to comment on specific patterns and explain why these occurred. First I am going to look at Amy and her results on the 50m sprint. Each of her runs was very different, her pulse rates varied, unlike Lucy's which were all very similar. The first point I am going to comment on is that Amy's resting pulse rate was very high. A reason for this may be because she was nervous just before her run. I know that her resting pulse rate is not actually this as on the 2nd run her pulse rate went below her resting one. ...read more.

Conclusion

This explains why Amy's pulse rate remained high for a while where as Lucy's dropped straight away. Lucy will not have had any oxygen debt because she is fitter and she will have been able to take in the required amount of oxygen because her heart is stronger and more blood is pumped with one beat. This means more oxygen can be taken to the lungs and therefore her muscles can respire aerobically for longer. My prediction was correct as it took Amy longer to return to her resting pulse rate than Lucy because she had to pay back oxygen debt. I was incorrect when I predicted Amy's pulse rate would go higher than Lucy's, this may be because Lucy was working at a higher effort than Amy, but there is no way to show this. Another odd result was Amy's resting pulse rate changing but I believe the reason for this is nervousness which would result in her pulse rate increasing. Overall I think the experiment worked well but I think we would have benefited from testing more people to get a more widely spread range of results so we could compare someone who does regular training to someone who does no training at all because there would be a bigger contrast. Deborah Sides 10JL Mr Fletcher ...read more.

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