A rower's breathing rate was measured during an intense training session on a rowing ergometer. The graph below shows the data collected over 10 minutes, with the high-intensity exercise period ending at 8 minutes, followed by a 2-minute recovery period.
Calculate the percentage increase in the rower's breathing rate from 0 minutes to 8 minutes.
Use the equation:
Percentage increase=Breathing rate at 8 minutes−Breathing rate at 0 minutesBreathing rate at 0 minutes×100 \text{Percentage increase} = \frac{\text{Breathing rate at 8 minutes} - \text{Breathing rate at 0 minutes}}{\text{Breathing rate at 0 minutes}} \times 100 Percentage increase=Breathing rate at 0 minutesBreathing rate at 8 minutes−Breathing rate at 0 minutes×100