Table 1: Indications for termination of an exercise testing protocol 22  
Low risk   Moderate risk   High risk
Subject indicates so
VO2 max has been attained (two of the following):
-

increase in VO2 of less than 100 ml/min despite an increase in exercise intensity

-

age predicted heart rate within 5 beats per minute

- R greater than 1.15
 
  Subject indicates so
- Heart rate reaches 90% predicted maximum
- R greater than 1.1
 
  Subject indicates so
-

Heart rate reaches 80% predicted maximum

- R greater than 1