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The Role of Exercise-Induced Arousal and Exposure to Blue-Enriched Lighting on Vigilance
摘要： It is currently assumed that exposure to an artificial blue-enriched light enhances human alertness and task performance, but recent research has suggested that behavioral effects are influenced by the basal state of arousal. Here, we tested whether the effect of blue-enriched lighting on vigilance performance depends on participants’ arousal level. Twenty-four participants completed four sessions (blue-enriched vs. dim light × low vs. high arousal) at 10 pm on four consecutive days, following a repeated-measures design. Participants’ arousal was manipulated parametrically through the execution of a cycling task at two intensities (low vs. moderate), and was checked by monitoring their heart rate. On each session, distal and proximal skin temperatures were recorded as a neuroergonomic index of vigilance, while participants performed a 20-min psychomotor vigilance task (PVT) under either blue-enriched light or dim light conditions. The Positive and Negative Affect Schedule (PANAS), Karolinska Sleepiness Scale (KSS), and Borg Rating of Perceived Exertion Scale (RPE) were used to measure subjective psychological state. The results showed that the exercise-induced manipulation of arousal produced robust alerting effects in most measures, while the lighting manipulation only attenuated subjective sleepiness and enhanced positive affect, but it did not influence behavior or physiology. Acute exposure to a blue-enriched light was practically ineffective when the arousal level was over baseline. The present research favored the use of acute physical exercise over acute exposure to blue-enriched lighting in order to boost humans’ levels of alertness when necessary, as in work settings where maintaining optimal attention is difficult (shift work, night-work, vigilance tasks) and necessary to prevent human error and accidents.
关键词： circadian,light,attention,heart rate,temperature,ergonomics,alertness,physical activity
更新于2025-09-23 15:22:29
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[IEEE 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - Trebic, Czech Republic (2018.9.18-2018.9.20)] 2018 VII. Lighting Conference of the Visegrad Countries (Lumen V4) - New Daylighting Metrics
摘要： Traditional daylighting metrics are gradually replaced by metrics based on absolute photometric parameters that are applied over the whole year. This process is at the stage of implementation in the design practice. The move to more realistic measures of daylighting is associated with a number of theoretical and practical problems. This article brings information about family of newly climate-based daylighting metrics that were developed in the world recently. The article also highlights some of the problematic aspects of climate-based daylighting metrics.
关键词： daylighting metrics,daylight autonomy,circadian light,climate-based daylight,sunlight
更新于2025-09-23 15:21:21
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Heterochromatic Flicker Photometry for Objective Lens Density Quantification
摘要： PURPOSE. Although several methods have been proposed to evaluate lens transmittance, to date there is no consensual in vivo approach in clinical practice. The aim of this study was to compare ocular lens density and transmittance measurements obtained by an improved psychophysical scotopic heterochromatic flicker photometry (sHFP) technique to the results obtained by three other measures: a psychophysical threshold technique, a Scheimpflug imaging technique, and a clinical assessment using a validated subjective scale. METHODS. Forty-three subjects (18 young, 9 middle aged, and 16 older) were included in the study. Individual lens densities were measured and transmittance curves were derived from sHFP indexes. Ocular lens densities were compared across methods by using linear regression analysis. RESULTS. The four approaches showed a quadratic increase in lens opacification with age. The sHFP technique revealed that transmittance decreased with age over the entire visual spectrum. This decrease was particularly pronounced between young and older participants in the short (53.03% decrease in the 400–500 nm range) wavelength regions of the light spectrum. Lens density derived from sHFP highly correlated with the values obtained with the other approaches. Compared to other objective measures, sHFP also showed the lowest variability and the best fit with a quadratic trend (r2 ? 0.71) of lens density increase as a function of age. CONCLUSIONS. The sHFP technique offers a practical, reliable, and accurate method to measure lens density in vivo and predict lens transmittance over the visible spectrum. An accurate quantification of lens transmittance should be obtained in clinical practice, but also in research in visual and nonvisual photoreception.
关键词： non-image forming,circadian light,ocular media,psychophysics,heterochromatic flicker photometry,cataract,clinical,lens density,photoreception
更新于2025-09-04 15:30:14