Ib Biology Design Ia
Design IA
Research Question
How Does Increasing the Intensity of Exercise Affect Respiratory Rate?
Hypothesis
My experiment will involve sprinting which is a very demanding and fatiguing sport. In order to increase the intensity of it, I will be increasing the weight the subject has to carry as he sprints. My hypothesis is that as you increase the weight, the respiratory rate will also increase. At rest, the average breathing rate for adults is 12-24 breaths per minute and for new born babies it is 30-60 breaths per minute. Younger people breathe more because they require more oxygen to accommodate for their rapid growth. Similarly, when we exercise we continually form ATP, which is generated by the oxidation of glucose. The oxidation of glucose requires oxygen. If we increase the intensity of exercise, we would need a lot more ATP and therefore we would need to oxidize glucose at a faster rate and hence our breathing rate would increase so that we can increase intake of oxygen.
Variables Independent Variable * Weight: measured in kilograms using a weight scale and will start from 0kg and be increased by 3kg for each trial up until 12kg. Books will be used as weights in this experiment. Dependent Variable * Respiratory rate: measured by counting the number of breaths for 30 seconds then doubling the number of breaths to calculate breathing rate Control Variable * Distance (50m) will be measured in meters using a tape measure and will be kept the same throughout the experiment because the same 50m stretch will be used throughout the whole experiment * Timing period (30s) while counting number of breathes will be controlled by having the same person manning the stopwatch for each trial to reduce the impact of random errors and variation. The number of breathes will then be multiplied by 2 each time to get breathes per minute * There will only be one person participating in the experiment and that one person will remain the
Research Question
How Does Increasing the Intensity of Exercise Affect Respiratory Rate?
Hypothesis
My experiment will involve sprinting which is a very demanding and fatiguing sport. In order to increase the intensity of it, I will be increasing the weight the subject has to carry as he sprints. My hypothesis is that as you increase the weight, the respiratory rate will also increase. At rest, the average breathing rate for adults is 12-24 breaths per minute and for new born babies it is 30-60 breaths per minute. Younger people breathe more because they require more oxygen to accommodate for their rapid growth. Similarly, when we exercise we continually form ATP, which is generated by the oxidation of glucose. The oxidation of glucose requires oxygen. If we increase the intensity of exercise, we would need a lot more ATP and therefore we would need to oxidize glucose at a faster rate and hence our breathing rate would increase so that we can increase intake of oxygen.
Variables Independent Variable * Weight: measured in kilograms using a weight scale and will start from 0kg and be increased by 3kg for each trial up until 12kg. Books will be used as weights in this experiment. Dependent Variable * Respiratory rate: measured by counting the number of breaths for 30 seconds then doubling the number of breaths to calculate breathing rate Control Variable * Distance (50m) will be measured in meters using a tape measure and will be kept the same throughout the experiment because the same 50m stretch will be used throughout the whole experiment * Timing period (30s) while counting number of breathes will be controlled by having the same person manning the stopwatch for each trial to reduce the impact of random errors and variation. The number of breathes will then be multiplied by 2 each time to get breathes per minute * There will only be one person participating in the experiment and that one person will remain the