RAPID TRANSMERIDIAN TRAVEL CAN PRODUCE JET LAG, WHICH IS CHARACTERIZED BY A CONSTELLATION OF SYMPTOMS, INCLUDING POOR NIGHTTIME SLEEP, INCREASED DAYTIME SLEEPINESS, DECREASED ALERTNESS, IMPAIRED PERFORMANCE, FATIGUE, IRRITABILITY, DEPRESSED MOOD, AND GASTROINTESTINAL DISTRESS.1-5 It is caused by a temporary misalignment between the endogenous circadian clock and the desired destination sleep/wa...

STUDY OBJECTIVES To study the adaptation and readaptation processes to 1 week of night work (6:30 PM to 6:30 AM) followed by 1 week of day work (6:30 AM to 6:30 PM). DESIGN Part of a randomized, placebo-controlled, crossover field study. Here, data from the placebo arm are presented. SETTING Oil rig in the North Sea. Work schedule: 2 weeks on a 12-hour shift, with the first week on the nigh...

AIMS There is increasing evidence linking a shift work schedule with various adverse health effects. The present study aimed to examine the relationship between shift work and the metabolic syndrome (MetS) in male steel workers, and also the possible mechanism of shift work-related metabolic derangements. METHODS A total of 1732 men aged 42 ± 8 years were enrolled in this cross-sectional stud...

Prolonged night shift is associated with high burnout rate, but the physiological effects of a 16 h shift remain undetermined. Here we evaluated fatigue and stress via salivary assays to determine the correlation between stress and fatigue and prolonged night shifts. Twenty-five nurses (9 men, 16 women; 16 h night shift (n = 13), 8 h day shift (n = 12)) from Juntendo University Koshigaya Hospit...

Shift work is associated with diet-related chronic conditions such as obesity and cardiovascular disease. This study aimed to explore factors influencing food choice and dietary intake in shift workers. A fixed mixed method study design was undertaken on a convenience sample of firefighters who continually work a rotating roster. Six focus groups (n = 41) were conducted to establish factors aff...

BACKGROUND Some medical disorders have higher prevalence in shift workers than others. This study was designed to evaluate the effect of night-shift-working on total plasma antioxidant capacity, with respect to the causative role of oxidative stress in induction of some of these disorders. METHODS Two blood samples were taken from 44 workers with a rotational shift schedule, one after their d...

Modafinil (Provigil) is a medication used to promote wakefulness. Originally marketed in 1998, modafinil, a Schedule C-IV drug, was approved by the Food and Drug Administration (FDA) for the treatment of excessive sleepiness (ES) associated with narcolepsy. In 2003, the FDA approved modafinil for the treatment of ES associated with obstructive sleep apnea-hypopnea syndrome (only as an adjunct t...

Heavy-duty vehicle hydrodynamic mechanical automatic transmission shifting operation system was designed, mathematical model of its simplified hydraulic system was established and simulation model of shifting operation system was established with AMESim, the simulation experiment was carried out, then oil pressure curves of each clutch hydraulic cylinder were obtained when giving forward gear o...

background one of most important operations research problems is nurse scheduling problem (nsp) that tries to find an optimal way to assign nurses to shifts with a set of hard constraints. most of the researches are dealing with this problem in deterministic environment with constant parameters. while in the real world applications of nsp, the stochastic nature of some parameters like number of...