Investigating the relationship between changes in ventilation rate after exercise and vital capacity
The grade 11 students are working on their next internal assessment. In the first lesson, they measured their ventilation (breathing) rate before and after exercise. In the second lesson, we demoed the use of a spirometer and then blew into balloons and calculated the volume to determine their vital capacity. They will calculate the correlation coefficient of the two factors to determine whether these is a relationship and its strength. This investigation also offers many opportunities to discuss limitations and improvements of the method.