What makes implementation intentions (in)effective for physical activity among older adults?

Area of Science:

• Gerontology
• Behavioral Science
• Public Health

Background:

• Implementation intentions (IIs) are a behavior change technique proven effective for promoting physical activity (PA) in general populations.
• Evidence for II effectiveness in older adults is mixed, necessitating investigation into specific II characteristics that enhance PA enactment in this demographic.

Purpose of the Study:

• To analyze the content of implementation intentions (IIs) created by older adults within a self-regulatory intervention.
• To identify specific characteristics of IIs that predict successful physical activity (PA) enactment among older adults.

Main Methods:

• A sample of 126 German-speaking adults aged 64+ created up to six IIs for PA.
• Multilevel models analyzed associations between II characteristics (e.g., rank, specificity, heterogeneity, routines) and self-reported PA enactment after 5 weeks, controlling for age and sex.

Main Results:

• The chronological rank of an II was significant; earlier IIs were more effective than later ones.
• Greater heterogeneity in planned activities and specificity of 'when' cues (e.g., time, day) positively predicted PA enactment.
• Integration of pre-existing routines into IIs was strongly associated with successful PA enactment.

Conclusions:

• Older adults are more likely to engage in planned physical activity (PA) when their implementation intentions (IIs) involve diverse activities, specific timing, and integration into existing routines.
• The first three IIs were enacted more frequently than the last three.
• Future research should experimentally test interventions that guide older adults in creating IIs with these identified effective characteristics to improve health behavior change.