BMI energy calculations

High School ・Biology ・MLA ・1 Sources

Q1. Create a table and show the BMI energy calculations (You have already provided them in the results)

Part b. explain why BMI is required?

The BMI is the amount of energy needed by the body to perform its vital functions. It is used to assess whether there is a relationship between excess weight of the body, measure of BMI, and flow rate of gases into the alveoli. Their relationship would elaborate as to whether there is an increase in the consumption of oxygen in overweight individuals in comparison to underweight individuals, since the rate of flow of gases is in direct proportion to the oxygen requirements in the body.

Calculation of BMI

BMI= weight in kilograms/ height in cms

Normal= 18.5-24.9 kg/m2
Overweight = 25-29.9 kg/m2
Obese= 30-39.9 kg/m2
>40 kg/m2 over obese

Areas of uncertainties

BMI of 16.64, 18.3,18.5, 17.27, 18.46 kg/m2

From the graph above, if a line best of fit is drawn, the above line will deviate below the line of fit. The lines above show a reduction in the flow rate as compared with other values. The uncertainties may be due to difference in the gender since it has some little effect on the basal metabolic rate hence affect the rate of oxygen exchange within the alveoli. From the above diagram, the above points can be located and ascertained to be deviated from the trends of the graph.

Correlation Coefficient

There is no correlation coefficient from the results obtained in the graph above. From the results obtained, the BMI has no correlation with the rate of flow of the gases. BMI is a measure of excess weight in the body and therefore do not have direct link with the rate of flow of the gases. For example, from the figure above, BMI of 18.79 kg/m2 has an average rate of flow of 0.09 while a low BMI of 18.5 has a flow rate of 0.5. At the same time, BMI of 20 has flow rate of 1.13. The results show that, there is no direct link between the BMI and flow rate hence no correlation coefficient.

Observation from the graph.

From the graph, there is an increase in the BMI for flow rate of 0.07-0.26. The BMI then reduces to 19.67 for the flow rate of 0.29 and further decreases for flow rate of 16.64 at a flow rate of 0.31. The trend changes and a steep graph showing increase of BMI to 21.97 is observed at flow rate of 0.33. The BMI again decreases to 18.3 and 18.5 respectively for flow rate of 0.35 and 0.5 respectively. A steep line is observed showing increase in BMI to 22.32 at flow rate 0.58 before declining steeply to 17.27 at flow rate of 0.6. From the point, the BMI increases until 21.46 at flow rate of 12 and stop at 20 when the flow rate is highest at 1.13. The graph is not linear hence no correlation exists for the graph. The graph shoots before showing steep decline in all the scenarios showing no relationship between the two variables.


From the above graph, the results show weak or nearly no relationship between the BMI and rate of flow. BMI is a measure of excess weight in the body and therefore has no direct link with the rate of flow of the gases in the alveoli. Generally, weight is affected by muscle mass, age and sex and flow of gases has little correlation with the BMI and this explains the non-uniform curve obtained when BMI is plotted against the corresponding flow rate.


  1. The subject may not breathe exclusively through the mouth hence affecting the values obtained. The error can be solved by obtaining consent from the subject to lip his or her nose
  2. Human error in conducting and using the recording machines- can be solved by having the experiment performed by experienced person
  3. Timing on recording the data- Can be solved by taking the data while exhaling for more accurate results.
  4. Error due to the instruments- Can be solved by testing the equipment prior to the procedure and ensuring that they are good condition and working.

Work Cited

Index, Body Mass. "Body Mass Index (BMI)." (2015).

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