Protocol of the 6-year follow-up (Wave 2) of the mobility, activity, and social interactions study (MOASIS): a measurement burst design

Understanding how daily activities relate to health and well-being across the aging process requires data that capture short-term dynamics and long-term development. The Mobility, Activity, and Social Interactions Study (MOASIS) was originally launched in 2018 to investigate everyday activities, mobility, and social interactions in older adults using a combination of wearable sensors and smartphone-based experience sampling and cognitive assessments. The present protocol describes the 6-year follow-up (MOASIS Wave 2), which extends the original data collection to a measurement burst design to examine intraindividual dynamics of daily experiences evolving over longer periods of adult development and aging. A total of 77 older adult participants from the original cohort returned for the follow-up assessment. Further, 45 older adults were newly recruited, resulting in a total Wave 2 sample of 122 older adults aged 65 to 91 years, alongside 121 newly recruited younger adults aged 18 to 32 years. The design consists of three phases: (1) a baseline assessment including telephone interviews, online questionnaires, and laboratory-based cognitive and physical functioning tests; (2) a two-week ambulatory assessment combining passive sensing via the uTrail device (i.e., GPS, accelerometer, audio recording) and smartphone-based experience sampling and cognitive tasks administered seven times per day; and (3) posttest sessions including a map-based questionnaire linking participants’ GPS trajectories to contextualized reports about places visited and activities performed. Wave 2 expands the original Wave 1 measurement battery to include views on aging, mobility motivation, neighborhood social environments, and place-based restorative experiences. In sum, this study enables examination of the interplay between daily activities, environmental contexts, health and well-being across short- and long-term timescales and age group comparisons.