Increased Walking's Additive and No Substitution Effect on Total Physical Activity

Area of Science:

• Public Health
• Epidemiology
• Behavioral Science

Background:

• Understanding the relationship between specific physical activities and overall physical activity (PA) is crucial for public health.
• Previous research has explored substitution effects, but the additive nature of walking requires further investigation.

Purpose of the Study:

• To examine the association between changes in walking time and changes in total PA.
• To determine if walking time has an additive or substitutive effect on total PA in urban adults.

Main Methods:

• Utilized objective (accelerometers, GPS) and self-reported (International Physical Activity Questionnaire) data from 437 urban adults in Seattle.
• Assessed changes in walking and total PA over a 1-2 year follow-up period.
• Employed regression analyses to evaluate within-participant changes.

Main Results:

• A 1-minute increase in walking was associated with a 1-minute increase in total PA (objective data) and a 1.2-minute increase (self-reported data).
• An additive effect was consistently observed for utilitarian, transportation, and job-related walking.
• Recreational walking showed mixed results between objective and self-reported measures.

Conclusions:

• Both objective and self-reported data support an additive effect of utilitarian and total walking on overall physical activity.
• Findings suggest that increasing walking time is a viable strategy to boost total PA levels in adults.