Actigraphy has been widely used for the analysis of circadian rhythm. Current practice applies regression analysis to data from multiple days to estimate the circadian phase. This paper presents a filtering method for online processing of biometric data to estimate the circadian phase. We apply the proposed method on actigraphy data of fruit flies (Drosophila melanogaster).

BACKGROUND Human African trypanosomiasis (HAT) or sleeping sickness leads to a complex neuropsychiatric syndrome with characteristic sleep alterations. Current division into a first, hemolymphatic stage and second, meningoencephalitic stage is primarily based on the detection of white blood cells and/or trypanosomes in the cerebrospinal fluid. The validity of this criterion is, however, debated...

Abstract Actigraphy has been used for more than 60 years to objectively measure sleep–wake rhythms. Improved modern devices are increasingly employed diagnose sleep medicine disorders in the clinical setting. Although less accurate polysomnography, chief advantage of actigraphs lies cost-effective collection objective data over prolonged periods time under everyday conditions. Since cost wrist ...

INTRODUCTION Sleep-wake disturbances and concomitant cognitive dysfunction in Parkinson's disease (PD) contribute significantly to morbidity in patients and their carers. Subjectively reported daytime sleep disturbance is observed in over half of all patients with PD and has been linked to executive cognitive dysfunction. The current study used daytime actigraphy, a novel objective measure of n...

STUDY OBJECTIVES The majority of adolescent sleep research has utilized self-reported sleep duration and some have based information on a solitary question. Whilst some have claimed to have validated sleep survey data with objective actigraphy measures in adolescents, the statistical approach applied only demonstrates the strength of the association between subjective and objective sleep durati...

BACKGROUND Actigraphy provides a way to objectively measure activity in human subjects. This paper describes a novel family of statistical methods that can be used to analyze this data in a more comprehensive way. METHODS A statistical method for testing differences in activity patterns measured by actigraphy across subgroups using functional data analysis is described. For illustration this ...

We compared subjective and objective sleep patterns and problems, and examined cross-method correspondence across parent reports, child reports, and actigraphy-derived sleep variables in clinically-anxious children and healthy controls. In a multi-site, cross-sectional study, 75 pre-adolescent children (6 to 11 years; M = 8.7 years; SD = 1.4; n = 39/52 % female) were examined including 39 with ...

STUDY OBJECTIVES Sleep patterns of young adults are different from those of other age groups.. This study examined sleep patterns of cadets during their first year at the United States Military Academy. DESIGN This paper presents initial results of a 4-year longitudinal investigation into sleep patterns of college-age men and women. SETTING Data were collected at the United States Military ...