Investigating Sedentary Time in Aging: New Directions

To date, no one has tested whether the prompting features of commercially available wrist-worn devices (e.g., Jawbone Up) improve breaks from sitting. Single case designs are a cost-effective way to conduct a controlled, randomized study that can inform larger intervention trials. Because the investigators are interested in ascertaining the effect of a very specific intervention on a very specific/single outcome, this study is well-suited to this approach.

The investigators will conduct iterative single case experimental studies using randomization tests. This design can help evaluate technologies for behavior change. To increase statistical power, the investigators opted to conduct an ABA study design (also termed a reversal design) where A is baseline and B is an intervention. Using randomization tests, the length of each A and B phase are determined to vary randomly in length prior to the beginning of each participant's experiment. The investigators will constrain the total time of each A and B phase to last a minimum of 5 days to provide adequate exposure to the A (measurement only) and B (intervention) conditions. The maximum total number of days participants will be enrolled is 28.

Inclusion criteria

• Male or female
• BMI of 25+
• Ages 60+
• Continuously enrolled at Group Health for previous 12 months
• No record of death
• Not on the No Contact list
• Speaks, reads, and writes English
• Able to hold a conversation by phone (no hearing or other limitations)
• Self-reported ability to stand
• Self-reported ability to walk one block unassisted
• No history of an injury from a fall in past 3 months
• Work or retirement situations allows for taking breaks from sitting throughout the day
• Available for the study duration
• No unusual activities planned (e.g. travel, moving) during the study period
• Able to come to Group Health Capitol Hill/Central for measurement visits
• Willing to wear activity monitor (activPAL)
• Self-reports taking less than 4 breaks from sitting during an average hour
• Self-reports sitting more than 7 hours per day

Exclusion criteria

• Resides in long-term care, hospice care, or skilled nursing facility (previous 12 months)
• Wheelchair bound
• Diagnosis of dementia, serious mental health disorder, or substance use disorder (previous 24 months)
• Use of an assistive device