Zutphen Physical Activity Questionnaire

Abstract

The Zutphen Physical Activity Questionnaire (ZPA) is a specialized, self-administered instrument designed for the assessment and estimation of habitual daily physical activity levels. The questionnaire comprises 17 items focusing on activities performed during the preceding week. It was specifically developed and validated for use with aging populations, primarily targeting individuals aged 65 years and older, particularly within the context of long-term epidemiological studies tracking health and mortality outcomes.

Keywords

Physical activity questionnaire, ZPA, Gerontology, Mobility, Older adults, Epidemiology, Health assessment, Circulatory system, Respiratory system.

Authors

Caspersen (1991)

Purpose

The primary purpose of the ZPA is to quantify the level and pattern of physical activity in older adult cohorts. By focusing on activities relevant to daily living—such as walking, cycling, gardening, and household chores—the instrument provides researchers with data suitable for correlating activity expenditure with major health events, including cardiovascular disease and all-cause mortality. This metric is essential for public health research aimed at identifying modifiable risk factors in aging populations.

The ZPA utilizes a retrospective approach, asking respondents to estimate the frequency and duration of specific activities performed over the last seven days. This methodology allows for the calculation of total energy expenditure, providing a crucial variable for longitudinal studies like the original Zutphen Study.

Construct

The scale measures the construct of habitual physical activity, which encompasses both structured exercise and routine daily movement. The instrument operationalizes this construct by focusing on the domain of movement and mobility, capturing the intensity and time spent on activities ranging from sedentary behavior to vigorous exercise. This comprehensive approach is vital for understanding functional decline and maintenance in older age.

The activities assessed are specifically chosen because of their relevance to the daily life of the target population, ensuring that the measurement reflects real-world energy demands rather than idealized or specialized athletic performance.

Validity

The ZPA demonstrates strong criterion validity against other standardized, objective measures of energy expenditure, such as accelerometer data or measurements derived from heart rate monitoring, though the strength of correlation can vary based on the specific type of activity being assessed (e.g., walking often shows higher correlation than gardening). Its utility is further supported by consistent findings in epidemiological studies where low ZPA scores reliably predict increased morbidity and mortality risk.

The face validity is high, as the 17 items directly address common domains of activity (e.g., household, leisure, transportation) performed by older adults, ensuring that the instrument is perceived as relevant and understandable by the target population.

Reliability

The reliability of the ZPA, typically assessed via test-retest methodology, generally falls within acceptable ranges for self-report questionnaires (Interclass Correlation Coefficients often > 0.70). However, as with all recall instruments, reliability can be influenced by inherent memory biases, particularly when estimating the duration of light-intensity activities. Researchers typically administer the retest within a short period (e.g., 1–2 weeks) to maximize the stability of reported habitual behaviors.

Factor Analysis

Although the ZPA is often utilized as a single, summed score reflecting total energy expenditure, formal factor analysis frequently reveals multidimensional components underlying the 17 items. These components typically separate into domains such as ‘Household and Light Intensity Activities’ (e.g., cleaning, light walking) and ‘Moderate to Vigorous Leisure Activities’ (e.g., cycling, active sports). This structure supports the instrument’s ability to provide domain-specific insights into different types of physical activity crucial for cardiovascular and functional health.

Instrument

Test Type: Questionnaire (Self-report)

Format: 17 questions focusing on the frequency and duration of specific activities over the preceding seven days.

Language Available: Primarily used in Dutch (Zutphen context). No formal, standardized English translation is widely documented as of the original source reference.

Population Group: Adults, primarily older adults (Geriatric population).

Age Group: 65 years and older (Target population), also applicable to general adults.

Population Details: Individuals assessed for general health and epidemiological risk, particularly regarding the function of the circulatory and respiratory systems.

Test Methodology: Retrospective self-report using a structured checklist format to quantify time spent on various activities.

Keywords

ZPA, Activity assessment, Geriatric population, Health outcomes, Physical energy expenditure, Questionnaires, Cardiovascular health.

Authors

Author ORCID Identifier: Not provided in source documentation.

Affiliation Email addresses: Not provided in source documentation.

Correspondence Address: Correspondence typically directed toward the primary investigators of the Zutphen Study cohort.

Permissions & Fee and Test Year

The original conceptual framework for the physical activity assessment used in the Zutphen Study dates back to 1991, referenced by Caspersen. The ZPA is frequently utilized in non-commercial academic research settings, often available without a fee due to its origin in public health epidemiological work. However, researchers must secure formal permission from the relevant research group managing the Zutphen cohort data before implementation.

The original PDF for the explanatory form (Toelichtingsformulier) can be downloaded here: Toelichtingsformulier PDF

The original PDF for the measurement instrument (Meetinstrument) can be downloaded here: Meetinstrument PDF

Reference’s

• Caspersen, C. J. (1991). The contribution of physical activity to health. The Physician and Sportsmedicine, 19(11), 133-144.

• Relevant publications detailing the use and validation of the ZPA within the Zutphen Study cohort should be consulted for specific psychometric properties.

Items of the Zutphen Physical Activity Questionnaire

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

The specific 17 items of the Zutphen Physical Activity Questionnaire are contained within the original instrument PDF document linked above. The items cover various domains of movement, including:

• Walking for transportation or errands.
• Cycling (for transportation or leisure).
• Gardening and heavy yard work.
• Light household chores.
• Participation in sports or structured exercise.