Monitoring of ventilation in humans at rest and after mild and vigorous exercise.
Work in pairs. Both of you should complete the practical, taking it in turns to exercise.
1) Before you begin open a word document and write an appropriate title and the aim of the investigation and hypothesis.
2) Open an excel spreadsheet and copy out the tables below. Add the appropriate uncertainties.
3) Find out your average resting ventilation rate. To do this, sit quietly for a minute or two. Then count your breaths for 30 seconds. Repeat after mild exercise and then intense exercise.
3) Multiply by 2 to get your ventilation rate in breaths per minute.
4) Using excel, produce a bar chart showing the mean ventilation rate at each level of intensity. Copy the tables and graphs to a word document.
5) Calculate the mean % increase in ventilation from rest to mild exercise, rest to intense exercise and mild exercise. Show your answers and working out clearly on the word document.
7) Design a table to show the class data for the mean ventilation rate at each activity. Calculate the mean ventilation rate and standard deviation for each activity. Produce a chart to show this and add error bars to show the standard variation.
6) Describe the results and write an explanation for what you observe using scientific knowledge.
7) Evaluate to what extent the data you have collected supports your hypothesis. Suggest realistic improvements for your investigation.
8) A similar investigation was carried out measuring the ventilation rate of 5 people, A, B, C, D and E as they
walk at different speeds. The data collected is shown below. Copy it into an excel spreadsheet.
(a) Calculate the average ventilation rate and standard deviation for each walking speed.
(b) Produce a scatter graph showing the relationship between walking speed and the ventilation rate. Include error bars to represent the STDV. Ensure it is correctly labeled.
(c) Describe the relationship between speed of walking and breathing rate.
(d) Write an explanation for what you observe using scientific knowledge.
(e) Evaluate the validity of the data collected and suggest realistic improvements for this investigation. Think about confounding variables that cannot be easily controlled when investigating humans. Think about sufficient samples sizes to try and mitigate this.