Materials and Methods
Study design and recruitment
One-week surveillance of objectively assessed physical activity as part of the substudy of the “Life-space mobility in old age” (LISPE) cohort study in community-dwelling, 75–90-yearsold people, living in the municipalities of Muurame and Jyväskylä in central Finland. Study methods were published previously [18]. Baseline data were collected during an interview in the
participants’ homes (N = 848). Eligibility for participation (living independently, able to communicate, residing in the recruitment area and willing to participate) was determined during an initial phone interview. From March 26th to June 15th, 2012, a tri-axial accelerometer