The physiological rationale for using heart rate

Oxygen Heart Rate Rest

In healthy individuals and cardiac patients, the common aim of using heart rate is to act as a marker of the physiological strain of the exercising skeletal muscles. Specific to the cardiac patient, the role of heart rate in conjunction with systolic blood pressure also acts as a key indicator of myocardial strain Froelicher and Myers, 2000 . As a marker of the body's general physiological strain during aerobic exercise, heart rate is usually described as a percentage of maximal heart rate...

Measurement of functional capacity

Exercise tolerance testing ETT , or field tests of functional capacity, can produce an estimated METs value to guide risk stratification and exercise prescription. True values can only be obtained through cardio-pulmonary exercise testing using gas analysis. Predicted VO2max or extrapolated MET values have a degree of error, as compared to true VO2max when measured using gas analysis. Factors Influencing Accuracy in Clinical Practice METs or Vo2max peak The use of a sub-maximal symptom limited...