Navegando por Autor "Oliveira, Fernando Luiz Pereira"

Agora exibindo 1 - 3 de 3

Association of hypovitaminosis D with sleep parameters in rotating shift worker drivers.
(2023) Menezes Júnior, Luiz Antônio Alves de; Fajardo, Virgínia Capistrano; Nascimento Neto, Raimundo Marques do; Freitas, Silvia Nascimento de; Oliveira, Fernando Luiz Pereira; Pimenta, Fausto Aloísio Pedrosa; Coelho, George Luiz Lins Machado; Meireles, Adriana Lúcia
Objective To evaluate the association between sleep parameters and hypovitaminosis D in rotating shift drivers. Material and Methods We conducted a cross-sectional study on 82 male rotating shift workers (24–57 years old) with at least one cardiovascular risk factor (such as hyperglycemia, dyslipidemia, abdominal obesity, physical inactivity, hypertension, and smoking). Polysomnography was used to evaluate sleep parameters. Logistic regression was used to model the association between hypovitaminosis D and sleep parameters after adjustment for relevant covariates. Results Hypovitaminosis D (< 20 ng/mL) was seen in 30.5% of the workers. Shift workers with hypovitaminosis D had lower sleep efficiency (odds ratio [OR]: 3.68; 95% confidence interval [CI]: 1.95–5.53), lower arterial oxygen saturation (OR: 5.35; 95% CI: 3.37–6.12), and increased microarousal index (OR: 3.85; 95% CI: 1.26–5.63) after adjusting. Conclusion We suggest that hypovitaminosis D is associated with greater sleep disturbances in rotating shift workers.
Detecção do comprimento do período adequado de aquecimento em modelos de simulação a tempo discreto.
(2016) Duarte, Anderson Ribeiro; Norato, Hélida Mara Gomes; Silva, Victor Ferreira da; Oliveira, Fernando Luiz Pereira
Este artigo tem o objetivo de comparar dois procedimentos utilizados para detecção do comprimento adequado de períodos de aquecimento (warm-up) em modelos de simulação para sistemas de filas. Os modelos de simulação para sistemas de filas visam reproduzir fluxos para sistemas de fila. Entretanto, ao obter estimativas para determinados parâmetros de interesse, associados a estes sistemas, é possível que tais estimativas sejam comprometidas pela presença de algum viés associado à falta de estacionariedade na série temporal obtida ao longo do procedimento de simulação. Existem diversas técnicas para avaliação do período adequado de warm-up em sistemas de filas presentes na literatura, algumas destas técnicas são baseadas em procedimentos estatísticos. Neste trabalho estamos interessados em utilizar dois métodos de detecção de períodos de aquecimento, visando uma comparação e análise de qualidade de resultados obtidos.
Dynamics of haemocytes from Pseudosuccinea columella circulating infected by Fasciola hepatica.
(2017) Ribeiro, Vinicius Marques Antunes; Coaglio, Aytube Lucas; Oliveira, Fernando Luiz Pereira; Pereira, Cíntia Aparecida de Jesus; Lima, Walter dos Santos
The lymnaeids are important in the epidemiology of Fasciola hepatica, a neglected and endemic zoonosis. The interaction between the internal defense system of Pseudosuccinea columella and F. hepatica has been little studied. In the present study the effect of infection by F. hepatica on P. columella circulating haemocytes was investigated. Changes in the average number of total circulating haemocytes have been observed at 30 minutes post-infection and 1, 7, 10, 14, 21, 28 and 50 days post-infection (dpi). Miracidia were observed head-foot and mantle at 30 minutes post-infection. Miracidia/Sporocysts in the mantle skirt 1 dpi, and fully formed sporocysts were observed in the head-foot at 7 dpi. Rediae became evident at 10 dpi and were located between the haemocoel and the muscles from 14 dpi; 50 dpi, the rediae in the digestive gland contained cercariae. The statistical analysis of the total haemocytes of P. columella infected by F. hepatica showed significant differences on the 30 minutes post-infection and 1, 14, 21, and 28 dpi in comparison to uninfected molluscs (0 dpi). Therefore, the interference observed on the internal defence system of P. columella may have direct association with the development of F. hepatica.