Hear Rate Reserve Max

• • Moderate to vigorous intensity is represented by 40% to 70% of this heart rate reserve
  • For a patient presenting with a high risk of cardiac events during exercise you would more likely select 40% to 60% of this range whereas an uncomplicated person at low risk of cardiac events during exercise the upper range of 70% could be selected
  • However, for an individual who is unaccustomed to engaging in regular physical activity you would use the lower end of the range (40%) irrespective of risk if you were recommending continuous exercise
• reminder of the four steps required to work out the full 40% to 70% (i.e. moderate to vigorous intensity) training heart rate range:

  • Step 1: Calculate age predicted maximum heart rate
  • Predicted HR max (220-age) minus an additional 30 beats if beta blocked
  • Step 2: Calculate HRR
  • HRR = Predicted HR max – HR rest
  • Step 3: Calculate % of HRR for training heart rate range (e.g. 40 - 70% of HRR)
  • 0.4 x HRR
  • 0.70 x HRR
  • Step 4: Add resting heart rate
  • 0.40 x HRR + HR rest
  • 0.70 x HRR + HR rest
• • For anyone under the age of 45 we will be using 220 minus age
  • For anyone over the age of 45 we will be using the Inbar formula
  • 205.8 - (0.685 x age)
  • Where patients are on betablockers we also need to adjust for this by subtracting 30 beats from the estimated HR max
  • for heart failure, the Keteyian et al (2012) method is use