This is a great companion to the Respiration Rate Lab. In this activity, students hypothesize about the changes to their heart rates before and after exercise. Before you begin, you will need to help students find a way to count their heart rate. The carotid artery works well. Radial arteries are not as easy for students to monitor, but you should have them try, as this is where most doctors take pulse rates.
This activity, and the Respiration Rate Lab, are great ways to get students moving during science class. I love activities in which students get to experience the subject, rather than just hear about it or observe it. This is such an activity.
Included with these materials is a not that I included with the lab when I returned it. It was apparent form their responses that many students needed some further explanation. I attached this note to the rubric when I returned the lab.
I have included my rubric. You may use the Word file to alter it to suit your needs. My emphasis in class is to have students respond to the questions in full detailed sentences. There is not one correct answer, but I would like to see their responses reflect a participation in our class discussions. Students should use our discussion time to edit and revise their responses.