A fresh look at the use of nonparametric analysis in actimetry.

Actimetry has been used to estimate the sleep-wake cycle instead of the rest-activity rhythm. Although algorithms for assessing sleep from actimetry data exist, it is useful to analyze the rest-activity rhythm using nonparametric methods. This would then allow rest-activity rhythm stability, fragmentation and amplitude to be quantified. In addition, sleep and wakefulness efficiency can be quantified separately. These variables have been used in studies analyzing the effect of age, diseases and their respective treatments on human circadian rhythmicity. In this study, we carried out a comprehensive analysis of the main results from published articles and devised a functional model of interaction among the several components involved in generating the sleep-wake cycle. The nonparametric variables render it possible to infer the main characteristics of circadian rhythms, such as synchronization with a zeitgeber, and its amplitude and robustness.

Does the transition into daylight saving time really cause partial sleep deprivation?

AIM: To identify possible changes in the sleep patterns according to chronotype in undergraduate students during the daylight saving time (DST) transition. METHODS: A total of 378 students answered the Morningness-Eveningness Questionnaire (MEQ) to determine their chronotype and kept a diary about sleep-wake schedules 1 week before and after the DST transition. Oral mucosal cell samples were collected for genetic analysis. RESULTS: After the DST transition, intermediate types (I-types) delayed bedtime and increased their time in bed and all groups delayed their wake-up time. All groups presented a shorter phase angle between sunset and the bedtime after the DST transition. On the other hand, only E-types showed a tendency to reduce the phase angle between sunrise and wake-up time, while I-types and M-types kept the same phase angles between sunrise and wake-up time after the DST transition. The polymorphisms in the human genes CLOCK and PER3 were not associated with individual differences in sleep patterns, nor were they associated with an adjustment to the DST transition. CONCLUSION: Under the new set of social times determined by DST, the adjustment was only partial. I-types delayed bedtime and all groups delayed their wake-up times after the beginning of DST. Consequently, the time in bed after the DST transition was not reduced; Morning (M-types) and Evening-types (E-types) kept the same time in bed and I-types showed an increase on it.

A importância da avaliação da presença de disfunção temporomandibular em pacientes com dor crônica / Importance of evaluating the presence of temporomandibular disorders in chronic pain patients

Justificativa e objetivos:Pacientes com dor crônica apresentam um menor limiar à dor apresentando dessa forma dores em outras topografias. O objetivo deste estudo foi avaliar a presença de disfunção temporomandibular em pacientes com dor crônica em diversas partes do corpo comparando com um grupo controle sem sintomatologia dolorosa. Além disso, buscou-se verificar qual dos grupos apresentou mais sintomas de disfunção temporomandibular e alteração miofascial nos músculos da mastigação. Métodos: A amostra foi composta por 180 indivíduos, divididos em 2 grupos, sendo 90 pacientes com dor crônica em diversas partes do corpo: grupo estudo, e 90 pacientes sem sintomatologia dolorosa: grupo controle. Para o diagnóstico da sintomatologia de disfunção temporomandibular foi utilizado o questionário proposto pela Academia Americana de Dor Orofacial. Foi realizada uma avaliação física dirigida e validada. Análises foram feitas para verificar a frequência de sintoma de disfunção temporomandibular tanto no grupo controle quanto no grupo estudo e a presença de disfunção temporomandibular muscular em ambos os grupos. Resultados: Entre os pacientes com dor crônica 70% apresentaram sintomatologia para disfunção temporomandibular e no grupo controle 55%. Os pacientes que apresentaram sintomatologia foram avaliados fisicamente e constatou-se que 45% apresentaram dor miofascial nos músculos da mastigação, contra 28% no grupo controle. Conclusão: A presença de sintomatologia de disfunção temporomandibular e dor muscular nos músculos da mastigação foi maior em pacientes com dor crônica em relação ao grupo controle e deve ser levada em consideração quando se propõe avaliar e controlar todas as dores nesses pacientes.

Background and objectives:Chronic pain patients have lower pain threshold, thus having pain in other parts of the body. This study aimed at evaluating the presence of temporomandibular disorders in patients with chronic pain in different parts of the body comparing them to a pain-free control group. In addition, we tried to determine which group had more temporomandibular disorder symptoms and myofascial changes in masticatory muscles. Methods: Sample was made up of 180 individuals divided in 2 groups, being 90 patients with chronic pain in different parts of the body: study group, and 90 pain-free patients: control group. The questionnaire proposed by the American Academy of Orofacial Pain was used to diagnose temporomandibular disorder symptoms. A directed and validated physical evaluation was performed. Analyses were done to determine the frequency of temporomandibular symptoms both in the control group and the study group, and the presence of muscular temporomandibular disorders in both groups. Results: Among chronic pain patients, 70% had temporomandibular disorder symptoms and in the control group they were 55%. Patients with symptoms were physically evaluated and it was observed that 45% had masticatory muscles myofascial pain as compared to 28% in the control group. Conclusion: The prevalence of temporomandibular disorder symptoms and masticatory muscles pain was higher among chronic pain patients as compared to the control group and should be taken into consideration when the proposal is to evaluate and control all pains of such patients.