Circadian time structure of fatty acids and vascular monitoring

Summary The circadian variation of 40 circulating fatty acids related variables was assessed from one man (F) and one woman (G). Each provided blood samples by finger pricking at about 4-hour intervals for 24 hours. A statistically significant rhythm was found in 65% of the variables after data expressed as a percentage of their 24-hour mean values were pooled. In particular, a putative circadian rhythm for n-3 and n-6 fatty acids deserves exploration. The predominant 12-hour component found to characterize the n-3 status of G may stem from the odd schedule she followed on the day of study, as attested by alterations in the time structure of her blood pressure on the day of study, as compared to similarly collected data on 33 other Sundays in 2009 available as control information. Circadian vascular characteristics are sensitive markers of loads, including the rest-activity schedule

Reparametrization and Volume Mesh Generation for Computational Fluid Dynamics Using Modified Catmull-Clark Methods

Light is the major synchronizer of circadian rhythms. In the absence of light, as for totally blind people, some variables, such as body temperature, have an endogenous period that is longer than 24 h and tend to be free running. However, the circadian rhythm of muscle strength and reaction time in totally blind people has not been defined in the literature. The objective of this study was to determine the period of the endogenous circadian rhythm of the isometric and isokinetic contraction strength and simple reaction time of totally blind people. The study included six totally blind people with free-running circadian rhythms and four sighted people (control group). Although the control group required only a single session to determine the circadian rhythm, the blind people required three sessions to determine the endogenous period. In each session, isometric strength, isokinetic strength, reaction time, and body temperature were collected six different times a day with an interval of at least 8 h. The control group had better performance for strength and reaction time in the afternoon. For the blind, this performance became delayed throughout the day. Therefore, we conclude that the circadian rhythms of strength and simple reaction time of totally blind people are within their free-running periods. For some professionals, like the blind paralympic athletes, activities that require large physiological capacities in which the maximum stimulus should match the ideal time of competition may result in the blind athletes falling short of their expected performance under this free-running condition