Developing and validating equations to predict O₂ peak from the 6MWT in Childhood ALL Survivors

Area of Science:

• Exercise Physiology
• Pediatric Oncology
• Rehabilitation Medicine

Background:

• The 6-minute walking test (6MWT) assesses functional capacity, but existing prediction equations for maximal oxygen consumption (V̇O₂ peak) are inaccurate in cancer survivors.
• Childhood acute lymphoblastic leukemia (ALL) survivors require accurate methods to assess cardiorespiratory fitness for optimal rehabilitation and long-term health management.

Purpose of the Study:

• To develop and validate new prediction equations for V̇O₂ peak in childhood ALL survivors.
• To utilize the 6MWT combined with clinical and disease-specific variables for improved V̇O₂ peak estimation.

Main Methods:

• 200 childhood ALL survivors underwent cardiopulmonary exercise testing and 6MWT.
• Multiple linear regression analysis was used to establish new V̇O₂ peak prediction equations.
• The Bland and Altman method assessed the accuracy of the developed equations.

Main Results:

• A clinical V̇O₂ peak equation was established: V̇O₂ peak = (-0.283*age) - (0.099*weight) + (0.071*6MWD) - (0.135*HR_end) + 22.789 (mean bias 2.67).
• A disease-specific V̇O₂ peak equation was developed: V̇O₂ peak = (-0.236*age) - (0.094*weight) - (0.120*HR_end) + (0.067*6MWD) + (0.065*MVLPA) - (0.204*DT) + 25.145 (mean bias 2.51).
• Both equations demonstrated good accuracy in predicting V̇O₂ peak.

Conclusions:

• This study presents the first validated V̇O₂ peak prediction equations for childhood ALL survivors using the 6MWT.
• These new equations provide an accurate tool for assessing cardiorespiratory fitness, aiding in better follow-up and tailored physical training.
• The findings have significant implications for rehabilitation, enabling healthcare professionals and exercise physiologists to optimize survivor care.