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

Area of Science:

• Exercise Physiology
• Pediatric Sports Medicine
• Cardiorespiratory Fitness Assessment

Background:

• Predicting maximal oxygen uptake (V̇O₂max) in children presents challenges with existing methods.
• The Astrand-Ryhming test is a common submaximal protocol for estimating V̇O₂max.

Purpose of the Study:

• To modify the Astrand-Ryhming test for improved V̇O₂max prediction in children and adolescents.
• To develop and validate a new predictive equation for V̇O₂max in this demographic.

Main Methods:

• Direct V̇O₂max measurement via maximal treadmill testing.
• Submaximal protocol estimation using a modified Astrand nomogram.
• Multiple regression analysis incorporating age, body weight, and nomogram-estimated V̇O₂max.
• Cross-validation of the developed predictive equation.

Main Results:

• A multiple regression equation was developed and validated.
• No significant difference was observed between directly measured and equation-estimated V̇O₂max.
• High correlation (r=0.89) and good reliability (test-retest=0.95) were found.
• Standard error of estimate was 12%.

Conclusions:

• The modified Astrand-Ryhming test provides a valid and reliable method for predicting V̇O₂max in children and adolescents.
• This approach overcomes limitations of previous prediction methods.
• It offers a practical tool for assessing aerobic capacity in young populations.