Aim: To measure and compare the breathing rate before and after physical activity.

Materials:

• Stopwatch or timer
• Chair or seat
• A quiet area for resting
• A space for running in place (e.g., a clear floor space)

Procedure:

1. Resting Measurement:
   • Sit comfortably in a chair or on a seat in a quiet area.
   • Ensure the individual is at rest and calm for at least 5 minutes.
   • Use the stopwatch to measure the number of breaths (inhalation and exhalation) for one minute.
   • Record the number of breaths as the resting breathing rate.
2. Physical Activity:
   • Have the individual run in place for 5 minutes.
   • Ensure the activity is at a moderate pace.
3. Post-Exercise Measurement:
   • Immediately after running, sit the individual back in the chair or seat.
   • Allow them to rest and recover for at least 1 minute.
   • Measure the number of breaths (inhalation and exhalation) for one minute using the stopwatch.
   • Record the number of breaths as the post-exercise breathing rate.
4. Comparison:
   • Compare the number of breaths per minute recorded during the resting state with the number recorded after running.

Observations:

• The breathing rate should be lower during the resting phase and higher immediately after physical activity.

Conclusion:

• The experiment will show an increase in breathing rate after exercise compared to the resting state, demonstrating the body’s response to increased demand for oxygen.