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—

The existing adoptive criterion for •¬O2max was created for physically fit subjects who were soldiers and/or sportsmen. However, •¬O2max 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 •¬O2max in consideration of age and gender. The present study attempted to determine the reference range and critical values of the criterion for •¬O2max using the iterative truncation method. Voluntary •¬O2max was measured in 548 healthy volunteers, aged 8 to 82 years, using a treadmill. The %•¬O2max was calculated using the equation of %•¬O2max=measured •¬O2max •~ 100 gage-estimated •¬O2max. Crude data of %•¬O2max was applied to the iterative truncation method, and the reference range of %•¬O2max (70•`130%•¬O2max) was determined. Physiological and biochemical parameters, within the values of 70•`130%•¬O2max, were converted to a percentage using a similar equation of %•¬O2max. 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 •¬O2max. Taking a single or combined application of the critical value of each parameter, the adoptive ratio of •¬O2max was investigated. The present study indicated that there was no difference between •¬O2max selected by the iterative truncation method and that obtained by the existing criterion for •¬O2max. The combination of the critical value of HRmax and bLAmax was recommended as a criterion of •¬O2max. The reference value, critical value of •¬O2max and the critical real value of each parameter were shown as a mean of every 5-year interval with the distinction of gender. (Jpn. J. Phys, Fitness Sports Med. 2003, 52 : 585•`598) key word : reference value of •¬O2max, critical value of •¬O2max, critical value of adoptive criterion for •¬O2max, iterative truncation method, health-related physical fitness

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