Figure 2. Effect of Intrapersonal and Interpersonal Behavior Change Strategies (BCSs) on Older Adults’ Total Physical Activity (PA).

Quantity of PA was operationalized as mean (SE) changes in daily minutes of total PA (light, moderate, and vigorous intensities) averaged over 7 to 10 days. Physical activity was measured objectively using accelerometers within participants’ wearable activity monitors at 4 time points. Participants received 5 intrapersonal or interpersonal BCSs or did not (yes or no).