Use este identificador para citar ou linkar para este item:
Título: Nonparametric methods in actigraphy: An update
Autor(es): Gonçalves, Bruno S.B.
Cavalcanti, Paula R.A.
Tavares, Gracilene R.
Campos, Tania F.
Araujo, John F.
Palavras-chave: Actigraphy;Fragmentation;Synchronization;Amplitude;Activity;Rest
Data do documento: 3-Set-2014
Referência: GONÇALVES, Bruno S.B.. et al. Nonparametric methods in actigraphy: An update. Sleep Science, v. 7, p. 158-164, 2014. ISSN 1984-0659. Disponivel em: <!>. Acesso em: 18 jun. 2018.
Resumo: Circadian rhythmicity in humans has been well studied using actigraphy, a method of measuring gross motor movement. As actigraphic technology continues to evolve, it is important for data analysis to keep pace with new variables and features. Our objective is to study the behavior of two variables, interdaily stability and intradaily variability, to describe rest activity rhythm. Simulated data and actigraphy data of humans, rats, and marmosets were used in this study. We modified the method of calculation for IV and IS by modifying the time intervals of analysis. For each variable, we calculated the average value (IVm and ISm) results for each time interval. Simulated data showed that (1) synchronization analysis depends on sample size, and (2) fragmentation is independent of the amplitude of the generated noise. We were able to obtain a significant difference in the fragmentation patterns of stroke patients using an IVm variable, while the variable IV60 was not identified. Rhythmic synchronization of activity and rest was significantly higher in young than adults with Parkinson׳s when using the ISM variable; however, this difference was not seen using IS60. We propose an updated format to calculate rhythmic fragmentation, including two additional optional variables. These alternative methods of nonparametric analysis aim to more precisely detect sleep–wake cycle fragmentation and synchronization.
ISSN: 1984-0659
Aparece nas coleções:CB - DFIS - Artigos publicados em periódicos

Arquivos associados a este item:
Arquivo Descrição TamanhoFormato 
NonparametricMethodsInActigraphy_2014_.pdf1,64 MBAdobe PDFThumbnail

Os itens no repositório estão protegidos por copyright, com todos os direitos reservados, salvo quando é indicado o contrário.