Physical Activity Questionnaire

Abstract

The Vragenlijst fysieke activiteit (Physical Activity Questionnaire) is a highly concise psychological scale developed for use by healthcare professionals to rapidly screen and inventory a patient’s current level of physical activity. This instrument is uniquely brief, consisting of only two core questions that address engagement in physically heavy activity and moderate-intensity physical activity. The combined scoring derived from these two items allows for a quick determination of whether the patient meets the criteria for being sufficiently active or is categorized as insufficiently active, making it a valuable tool for initial health assessments related to mobility and preventative care.

Keywords

Physical Activity, Vragenlijst fysieke activiteit, Exercise, Questionnaire, Mobility, Health Screening, Sedentary Behavior, Prochaska.

Authors

Prochaska et al. (1999).

Purpose

The primary purpose of the Vragenlijst fysieke activiteit is to serve as an efficient, low-burden screening instrument for medical and psychological professionals. It is specifically designed to quickly quantify a patient’s adherence to recommended levels of physical activity. This rapid inventory is vital for identifying individuals who may require lifestyle counseling or further diagnostic assessment due to insufficient movement patterns.

The instrument’s brevity ensures high utility in high-volume clinical environments where time constraints necessitate quick, actionable data. By focusing on two key intensity levels—heavy and moderate—the scale aims to capture the critical volume of activity necessary for maintaining general health, particularly concerning the prevention and management of conditions related to the circulatory and respiratory system.

Construct

The central construct measured by the Vragenlijst fysieke activiteit is the patient’s overall physical activity engagement, operationalized through the intensity and frequency of movement. The scale assesses two distinct components that are recognized as critical contributors to health outcomes: physically heavy activity (vigorous exercise) and moderate-intensity physical activity. These components are combined to yield a holistic measure of activity level.

This approach aligns with established public health models that emphasize the necessity of incorporating both high- and moderate-intensity movements to achieve optimal health benefits. The scale serves as a practical measure of adherence to movement guidelines, focusing on the behavioral components of mobility and exercise habits.

Validity

Given the ultra-short nature of the Vragenlijst fysieke activiteit, its validity is typically inferred from its correlation with longer, established instruments or objective measures of physical activity. The authorship by Prochaska et al. (1999) suggests that its development may have been rooted in the Transtheoretical Model (Stages of Change), where activity level is a key factor in behavioral health.

The instrument exhibits strong face validity, as its two questions directly address the core types of exercise recommended by health bodies. For comprehensive understanding of its psychometric properties, researchers and clinicians should consult the original validation studies by the authors, which would detail criterion validity against gold-standard measures like accelerometers or comprehensive activity logs.

Reliability

Assessing the internal consistency of a two-item scale like the Vragenlijst fysieke activiteit is limited by its structure. Therefore, reliability is primarily evaluated through stability metrics, such as test-retest reliability. High reliability in this context means that the instrument provides consistent classification (sufficient versus insufficient activity) when administered to the same individual over a short interval, assuming no change in their actual physical activity behavior.

To maximize reliability in a clinical setting, standardized administration procedures are essential. The simplicity of the two questions, focusing on clearly defined activity intensity levels, inherently contributes to its reliable use as a quick screening tool for the target populations, including Adults and the Elderly.

Factor Analysis

Formal factor analysis, which seeks to identify underlying latent variables, is not typically performed or relevant for a scale comprising only two items. The structure of the Vragenlijst fysieke activiteit is inherently unidimensional, designed to produce a single, composite score representing total activity level by summing the responses related to heavy and moderate intensity exercise.

The instrument assumes that both types of physical activity contribute equally to the overall construct of sufficient activity. Therefore, psychometric evaluation focuses on the scale’s predictive utility and its capacity to differentiate between high- and low-activity groups, rather than its internal factor structure.

Instrument

Test Type: Psychological Scale / Health Screening Tool

Format: Brief, self-report or interview-administered Questionnaire.

Language Available: Original version is Dutch (Vragenlijst fysieke activiteit).

Population Group: Clinical and General populations.

Age Group: Adults and Elderly (Volwassenen, Ouderen).

Population Details: Used to assess general physical activity levels, particularly relevant for individuals whose health status is influenced by movement, such as those with or at risk for conditions affecting the circulatory and respiratory system.

Test Methodology: The methodology involves quantifying a patient’s time spent engaging in two specified categories of activity (heavy and moderate intensity). The resulting score is used to determine a binary classification of activity sufficiency.

Keywords

Screening Tool, Mobility/Movement, Physical Activity, Cardiovascular Health, Health Assessment, Two-Item Scale, Prochaska.

Authors

Author ORCID Identifier: Information not provided in source.

Affiliation Email addresses: Information not provided in source.

Correspondence Address: Information not provided in source.

Permissions & Fee and Test Year

The Vragenlijst fysieke activiteit was first introduced by Prochaska et al. in 1999. Users intending to implement this scale should consult the original publishing source or authors to determine current permissions, licensing requirements, and any associated fees for clinical or research use.

The original PDF documentation for the Explanation Form (Toelichtingsformulier) is available here: Vragenlijst fysieke activiteit – Explanation Form PDF.

The original PDF document for the Measurement Instrument (Meetinstrument) is available here: Vragenlijst fysieke activiteit – Measurement Instrument PDF.

Reference’s

Prochaska, J. O., et al. (1999). Specific references detailing the initial development and validation of the Vragenlijst fysieke activiteit are associated with research focusing on exercise behavior and the Transtheoretical Model.

Items of the Vragenlijst fysieke activiteit

IMPORTANT: The following scale items must be preserved in their original language and must not be changed in any way.

The source content indicates that the instrument is composed of two specific questions used for scoring activity sufficiency. These items are:

• A question concerning fysiek zware activiteit.
• A question concerning matig-intensieve fysieke activiteit.