Final answer:
The intensity for stage 2 can be calculated based on the individual's maximum heart rate (HR) and the average steady state heart rate at the end of the 1st stage. By finding the percentage of the individual's maximum HR within the desired heart rate range, the intensity for stage 2 can be determined.
Step-by-step explanation:
The intensity for stage 2 can be determined based on the individual's maximum heart rate (HR). Maximum HRs are normally in the range of 200-220 bpm. As one ages, the ability to generate maximum rates decreases. This can be estimated by taking the maximal value of 220 bpm and subtracting the individual's age.
Let's assume the individual's age is 40. According to the information provided, a 40-year-old person would achieve a HR of 160 at their maximum rate. If the average steady state heart rate at the end of the 1st stage is 80-89 bpm, then the intensity for stage 2 can be calculated by finding the percentage of the individual's maximum HR within the range 80-89 bpm.
Essentially, we want to find what percentage of the range 80-89 bpm is equivalent to the difference between the individual's maximum HR (160 bpm) and the lower end of the range (80 bpm). This can be calculated using the formula:
Percentage = (Maximum HR - Lower end of range) / (Upper end of range - Lower end of range)
By substituting the given values into the formula:
Percentage = (160 bpm - 80 bpm) / (89 bpm - 80 bpm) = 80 bpm / 9 bpm = 8.89
So, the intensity for stage 2 is approximately 8.89% of the individual's maximum HR.