Physical activity assessment in the general population; validated self-report methods.

Area of Science:

• Epidemiology
• Biostatistics
• Public Health

Background:

• Self-reported questionnaires are widely used for assessing physical activity in large studies.
• Evidence links physical activity to health protection, but questionnaire accuracy is debated.
• Objective measures reveal limitations in survey techniques for physical activity assessment.

Purpose of the Study:

• To evaluate the accuracy and precision of self-reported physical activity questionnaires.
• To compare questionnaire-based assessment with objective measures of physical activity and energy expenditure.
• To identify limitations of current physical activity assessment methods.

Main Methods:

• Review of validation studies comparing self-reported questionnaires with objective measures (e.g., accelerometers, doubly labeled water).
• Analysis of questionnaire design and focus on different types of physical activity.
• Evaluation of advantages and disadvantages of subjective versus objective assessment tools.

Main Results:

• Self-reported questionnaires exhibit limited accuracy and precision, particularly for non-vigorous physical activity.
• Questionnaires often overemphasize volitional exercises and neglect daily living activities.
• Objective tools are preferred for accuracy, but questionnaires offer cost-effectiveness and insights into activity patterns.

Conclusions:

• Traditional survey methods for physical activity measurement lack sufficient precision and accuracy.
• Future research should explore mixed-methods approaches combining objective tools with electronic questionnaires.
• Integrating novel devices and electronic data capture can enhance physical activity assessment.