The use of heart rate as an index of training intensities has been widely accepted for healthy people. Recently, a number of studies have demonstrated that relationship between %HRmax and %VO2max described by American college sport science (ACSM) is not applicable to the some disorders. The objective of this investigation was to determine the relationship between %HRmax and %VO2max in 25 adolescent with diplegia spastic cerebral palsy. HR and VO2 responses to at rest and each stage of a standard ergometery protocol were measured in 25 adolescent with spastic that participated in study with consent of their parents as well as specialist physician. These parameters were then used for calculation %HRmax and %VO2max in all stages. A spearman method was conducted to determine correlation between %HRmax and %VO2max. Although, the study findings showed a significant correlation between %HRmax and %VO2max, but their regression line is not according to the identity line. These results suggest that the relationship between these indexes is not similar to guideline of ACSM in spastic patients. Thus, the %HRmax versus %VO2max relationship should be determined directly in each patient.
