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Interest in the effects of sleeping behavior on health and performance is continuously increasing-both in research and with the general public. Ecologically valid investigations of this research topic necessitate the measurement of sleep within people's natural living contexts. We present evidence that a new approach for ambulatory accelerometry data offers a convenient, reliable, and valid measurement of both people's sleeping duration and quality in their natural environment. Ninety-two participants (14-83 years) wore acceleration sensors on the sternum and right thigh while spending the night in their natural environment and following their normal routine. Physical activity, body posture, and change in body posture during the night were classified using a newly developed classification algorithm based on angular changes of body axes. The duration of supine posture and objective indicators of sleep quality showed convergent validity with self-reports of sleep duration and quality as well as external validity regarding expected age differences. The algorithms for classifying sleep postures and posture changes very reliably distinguished postures with 99.7% accuracy. We conclude that the new algorithm based on body posture classification using ambulatory accelerometry data offers a feasible and ecologically valid approach to monitor sleeping behavior in sizable and heterogeneous samples at home.
Pubmed ID: 23110178
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A portal to educate, engage and create an online community. The Fisher Center for Alzheimer''s Research Foundation, founded in 1995, was created in answer to the recommendations of three U.S. Senate commissioned symposia held in the 1990s by the National Institutes of Health (NIH) to gather information on the cause, care and cure of Alzheimer''s disease. The Fisher Center was created following this design. The funding initiatives of the Foundation are appropriated accordingly to the three areas cited by the NIH task force cause, care and cure. The primary resources of the Foundation are directed toward scientific research into the cause and hopefully the cure of Alzheimer''s disease. To this end, the Foundation under the direction of its founder, Zachary Fisher, and in collaboration with David Rockefeller, constructed the Fisher Center for Alzheimer''s Disease Research at The Rockefeller University, headed by 2000 Nobel Prize winner, Paul Greengard, Ph.D. The 10,000 square foot laboratory is the most advanced facility of its kind in the country equipped with the latest in equipment necessary to undertake an interdisciplinary assault on this disease. The Fisher Center also has collaborative programs at the University of Genoa and supports the work of well over 60 scientists and researchers across the United States and in 17 foreign countries. The Foundation also funds projects for the care of people with Alzheimer''s disease and their caregivers. The Fisher Alzheimer''s Disease Education and Resources Program at the New York University School of Medicine was established under the direction of Barry Reisberg, M.D., internationally known expert in the care of Alzheimer''s patients. The Foundations Alzheimer''s Information Program was created in 2001 to answer the primary need of caregivers for comprehensive, easily accessible information. Our goals are to: Understand the Cause of Alzheimer''s To find a Cure for this devastating disease Improve the Care of people living with the disease to enhance their quality of life and that of their caregivers and families About Our Research Beating Back Beta Amyloid Improving the Quality of Life for Alzheimers Patients Reversing Nerve Cell Damage Using Hormones to Slow the Progress of Disease Curing Early-Onset Alzheimers The Science of Caregiving Scientific Studies
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