We validated a Fitbit sleep tracking device against typical research-use actigraphy across four nights on 38 young adults. Fitbit devices overestimated sleep and were less sensitive to differences compared to the Actiwatch, but nevertheless captured 88 (poor sleepers) to 98 percent (good sleepers) of Actiwatch estimated sleep time changes. Bland-Altman analysis shows that the average difference...

also in our study ‘good sleepers’ have Hb values significantly higher than the ‘poor sleepers’, even if they do not reach the values obtained by Iliescu et al.: this confirms that a clinical trend to a better sleep quality exists by raising Hb levels. In summary, although the data of statistical analysis must be clearly kept in mind, to raise Hb levels above our reported values remains a possib...

Alternative sleeper technologies have been developed to address the significant need for replacement of deteriorating timber railway sleepers. The review literature indicates that sleepers might fail while in service, despite passing evaluation tests current composite standards which indicated these do not represent situ on ballast. In this research, a new five-point bending test is evaluate fl...

In this study, the remaining life of PC sleepers is evaluated from viewpoint fatigue PC-steels sleepers. Specifically, a method acquiring stress waveform during train running developed. Furthermore, using waveform, we calculate strength in consideration occurrence probability wheel loads actual measurement, and quantitatively evaluate PC-steels. The result study shows that for post-tension type...

in this research, the structural behavior of timber and concrete sleepers in a standard railway turnout is evaluated, in the case of raising speed. in approaching this evaluation, current practices in the structural analysis of sleepers are surveyed and then, the sensitivity analysis with abaqus software is made based on selected criteria (bending and shear stresses as well as contact pressure)...

There appears to be some inconsistency in how normal sleepers (controls) are selected and screened for participation in research studies for comparison with insomnia patients. The purpose of the current study is to assess and compare methods of identifying normal sleepers in insomnia studies, with reference to published standards. We systematically reviewed the literature on insomnia patients, ...

OBJECTIVES To examine age-related differences in self-reported sleep quality and their associations with health outcomes across four domains: physical health, cognitive health, mental health and neural health. SETTING Cambridge Centre for Ageing and Neuroscience (Cam-CAN) is a cohort study in East Anglia/England, which collected self-reported health and lifestyle questions as well as a range ...

Lattice-type bi-block reinforced concrete (RC) sleepers have been widely used for cast-in-place slab tracks. However, the standards manufacturing, inspection, and performance verification of lattice-type RC are not well established, even when such a sleeper is critical component track. Therefore, it necessary to develop new standard sleepers. In this study, requirements relevant were investigat...