Serum Creatine Kinase Activity and Delayed Onset Muscle Soreness in Prepubescent Children: A Preliminary Study

The Astrand-Ryhming est was modified to overcome problems of predicting V̇O₂max in children. V̇O₂max was measured directly during a maximal treadmill test and estimated by means of a submaximal protocol in a test group of 51 subjects ages 10-18 years. A multiple regression equation was developed with directly measured V̇O₂max as the dependent variable and age, body weight, and V̇O₂max estimated from the Astrand nomogram as independent variables. The validity and reliability of this equation to predict V̇O₂max in children and adolescents was cross-validated. No significant difference was found between the measured V̇O₂max and that estimated from the equation. The correlation coefficient between measured and estimated V̇O₂max for the cross-validation group was 0.89, with a standard error of estimate of 12%. Test-retest reliability was 0.95. It was concluded that this modification of the Astrand nomogram provides a valid and reliable prediction of V̇O₂max in children and adolescents.