Reducing Systematic Overestimation Bias in the Duke Activity Status Index Estimated Peak Oxygen Uptake: A...

Area of Science:

• Cardiology
• Exercise Physiology
• Geriatrics

Background:

• The Duke Activity Status Index (DASI) is a common tool for estimating functional capacity.
• Cardiopulmonary exercise testing (CPET) provides a more accurate measure of peak oxygen uptake (VO2).
• Previous studies suggest DASI may overestimate VO2, particularly in certain populations.

Purpose of the Study:

• To investigate anthropometric and demographic differences in DASI's overestimation of peak VO2 compared to submaximal CPET (smCPET) in adults over 60.
• To identify predictors of DASI overestimation.
• To develop a correction factor for DASI-derived VO2 estimates.

Main Methods:

• Analysis of anthropometric and demographic data from 226 participants >60 years old.
• Comparison of DASI-estimated VO2 with smCPET-derived peak VO2.
• Regression analysis to identify predictors of overestimation.
• Development of a correction formula.

Main Results:

• Both males and females overestimated peak VO2 using DASI compared to smCPET (males: 5.9±7.7 mL kg-1 min-1; females: 7.2±7.1 mL kg-1 min-1).
• Body Mass Index (BMI) was a significant predictor of overestimation, with higher BMI correlating with greater overestimation.
• A correction factor incorporating DASI sum, BMI, age, and sex was developed to adjust VO2 estimates.

Conclusions:

• DASI overestimates peak VO2 in older adults, with the degree of overestimation influenced by BMI.
• The developed correction factor can improve the accuracy of DASI-based VO2 estimations in this age group.
• Accurate VO2 assessment is crucial for clinical decision-making in older populations.