REFERENCE RANGE AND ADOPTIVE CRITERION FOR MAXIMAL OXYGEN UPTAKE (VO2max) IN CONSIDERATION OF AGE AND GENDER-REFERENCE RANGE FOR VO2max ATTAINED BY MEANS OF THE ITERATIVE TRUNCATION METHOD / 体力科学

ABSTRACT

The existing adoptive criterion for VO<SUB>2</SUB>max was created for physically fit subjects who were soldiers and/or sportsmen. However, VO<SUB>2</SUB>max is widely used at present as one of the health-related physical fitness determinants from children to aged persons. It might be appropriate to determine the criterion and the critical values for VO<SUB>2</SUB>max in consideration of age and gender.<BR>The present study attempted to determine the reference range and critical values of the criterion for VO<SUB>2</SUB>max using the iterative truncation method. Voluntary VO<SUB>2</SUB>max was measured in 548 healthy volunteers, aged 8 to 82 years, using a treadmill. The % VO<SUB>2</SUB>max was calculated using the equation of %VO<SUB>2</SUB>max=measured VO<SUB>2</SUB>max × 100 gage-estimated VO<SUB>2</SUB>max. Crude data of %VO<SUB>2</SUB>max was applied to the iterative truncation method, and the reference range of %VO<SUB>2</SUB>max (70-130%VO<SUB>2</SUB>max) was determined. Physiological and biochemical parameters, within the values of 70-130%VO<SUB>2</SUB>max, were converted to a percentage using a similar equation of %VO<SUB>2</SUB>max. The value corresponding to 10% of the lower area of the distribution of each parameter was defined as the critical value, which was the minimum level to adopt as the VO<SUB>2</SUB>max. Taking a single or combined application of the critical value of each parameter, the adoptive ratio of VO<SUB>2</SUB>max was investigated.<BR>The present study indicated that there was no difference between VO<SUB>2</SUB>max selected by the iterative truncation method and that obtained by the existing criterion for VO<SUB>2</SUB>max. The combination of the critical value of HRmax and bLAmax was recommended as a criterion of VO<SUB>2</SUB>max. The reference value, critical value of VO<SUB>2</SUB>max and the critical real value of each parameter were shown as a mean of every 5-year interval with the distinction of gender.