EXERCISE 67 



Problem. What effect has moderate exercise on the rate of respiration ? 



What to use. Chart for keeping record of class. 



What to do. As teacher keeps time for one minute, count number of breaths taken during the 

 interval. After a brisk two-minute drill or setting-up exercise, count breaths as before for one minute. 



Record your own count : Before exercise After exercise 



Record. In the table below enter in appropriate spaces the number of students who took 12 breaths 

 per minute before exercising, the number who took 13 breaths, and so on. Then record in the same 

 way the number who took 12 breaths after exercising, the number who took 13 breaths, and so on. 1 



Questions. 1 . What is the lowest breathing rate in the class before exercise ? 



2. What is the highest breathing rate ? 



3. What is the average breathing rate ? 



4. What effect has exercise on the rate of breathing ? Can you tell why ? 



5. Can you find any connection between age and the rate of breathing ? between sex and the rate 

 of breathing ? between stature and the rate of breathing ? 



6. What besides exercise makes your breathing rate vary ? 



1 You can show all the facts graphically by drawing a horizontal line across the appropriate space for each student who took 

 a given number of breaths per minute. If the horizontal lines are equal distances apart (say an eighth of an inch), the heights 

 of the columns will correspond to the number of students in each group. 



[72] 



