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    Many endurance athletes train at high altitudes before a major sporting event. They do this because they think that training at high altitude changes the number of red blood cells in their body. Describe an investigation to find out if training at high altitude does change the number of red blood cells in the human body. what are the control variables? (6marks)
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    Im not sure if this will be right but here goes:
    First, get 2 athletes/people that nearly have the same body mass, weight, heart rate, and red blood cell numbers. label the 2 people A and B. Place A at a high altitude and place B on surface ground. Let both people do the same exercises at the same rate for the same amount of time. take a blood sample (same volume of blood removed) from each athlete and test it for the red blood cell count. Repeat the experiment for accuracy and compare both blood samples, if they are similar, then altitude doesnt affect the rbc count. If not, then it does.

    (im really not sure of my answer though so i may be mistaken. Hopefully it helped)
 
 
 
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Updated: February 12, 2018
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