title: Obtaining Reliable Estimates of Ambulatory Physical Activity in People with Parkinson's Disease.
abstract: We determined the number of days required, and whether to include weekdays and/or weekends, to obtain reliable measures of ambulatory physical activity in people with Parkinson's disease (PD). Ninety-two persons with PD wore a step activity monitor for seven days. The number of days required to obtain a reliable estimate of daily activity was determined from the mean intraclass correlation (ICC2,1) for all possible combinations of 1-6 consecutive days of monitoring. Two days of monitoring were sufficient to obtain reliable daily activity estimates (ICC2,1 > 0.9). Amount (p = 0.03) but not intensity (p = 0.13) of ambulatory activity was greater on weekdays than weekends. Activity prescription based on amount rather than intensity may be more appropriate for people with PD.
authors.affiliation: Department of Physical Therapy, University of Utah, Salt Lake City, UT, USA.|The George Institute for Global Health, Sydney Medical School, The University of Sydney, Sydney, NSW, Australia.
authors.forename: Serene S
authors.initials: SS
authors.lastname: Paul
authors.affiliation: Department of Physical Therapy and Athletic Training, Boston University, Boston, MA, USA.
authors.forename: Terry D
authors.initials: TD
authors.lastname: Ellis
authors.affiliation: Department of Physical Therapy, University of Utah, Salt Lake City, UT, USA.
authors.forename: Leland E
authors.initials: LE
authors.lastname: Dibble
authors.affiliation: Program in Physical Therapy, Department of Neuroscience, Department of Neurology, Washington University in St. Louis-School of Medicine, St Louis, MO, USA.
authors.forename: Gammon M
authors.initials: GM
authors.lastname: Earhart
authors.affiliation: Department of Physical Therapy, Samford University, Birmingham, AL, USA.
authors.forename: Matthew P
authors.initials: MP
authors.lastname: Ford
authors.affiliation: Department of Physical Therapy, University of Utah, Salt Lake City, UT, USA.
authors.forename: K Bo
authors.initials: KB
authors.lastname: Foreman
authors.affiliation: Department of Physical Therapy, University of New England, Portland, ME, USA.
authors.forename: James T
authors.initials: JT
authors.lastname: Cavanaugh
mesh_terms: D000368:Aged; D015444:Exercise; D005260:Female; D006801:Humans; D008297:Male; D018670:Monitoring, Ambulatory; D010300:Parkinson Disease / Q000175:diagnosis* / Q000503:physiopathology / Q000523:psychology
keywords: Exercise; Parkinson disease; physical fitness; reproducibility of results