Examination of wrist and hip actigraphy using a novel sleep estimation procedure
Abstract
Objective: Improving and validating sleep scoring algorithms for actigraphs enhances their usefulness in clinical and research applications.The MTI® device(ActiGraph, Pensacola, FL) had not been previously validated for sleep. The aims were to(1)compare the accuracy of sleep metrics obtained via wrist - and hip-mounted MTI® actigraphs with polysomnographic (PSG) recordings in a sample that included both normal sleepers and individual swith presumed sleep disorders; and (2) develop a novel sleep scoring algorithm using spline regression to improve the correspondence between the actigraphs and PSG. Methods: Original actigraphy data were amplified and their pattern was estimated using a penalized spline. The magnitude of amplification and the spline were estimated by minimizing the difference in sleep efficiency between wrist-(hip-)actigraphs and PSG recordings. Sleep measures using both the original and spline-modified actigraphy data were compared to PSG using the following: mean sleep summary measures; Spearman rank-order correlations of summary measures; percent of minute-by-minute agreement; sensitivity and specificity; and Bland–Altmanplots. Results: The original wrist actigraphy data showed modest correspondence with PSG, and much less correspondence was found between hip actigraphy and PSG. The spline-modified.
Publication Title
Sleep Science
Recommended Citation
Ray, M., Youngstedt, S., Zhang, H., Robb, S., Harmon, B., Jean-Louis, G., Cai, B., Hurley, T., Hébert, J., Bogan, R., & Burch, J. (2014). Examination of wrist and hip actigraphy using a novel sleep estimation procedure. Sleep Science, 7 (2), 74-81. https://doi.org/10.1016/j.slsci.2014.09.007
