The Effect of Dynamic Lighting for Working Shift People on Clinical Heart Rate Variability and Human Slow Wave Sleep

• Published in: Applied sciences Vol. 12; no. 5; p. 2284
• Main Authors: Chen, Chien-Yu, Chen, Hung-Wei
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.03.2022
• Subjects: Autonomic nervous system; Cardiovascular disease; Chronic illnesses; Control methods; Design; Design of experiments; dynamic light; Experimental design; Experiments; Eye movements; Heart rate; heart rate variability; Illumination; Insomnia; Light; Lighting; Lighting systems; Manual workers; Melatonin; novel hypnotic lighting system; Occupational stress; Pulse duration modulation; Questionnaires; R&D; Research & development; Sleep; Sleep apnea; Sleep disorders; sleep quality; Software; work efficiency; Working hours; Wrist; δ wave
• ISSN: 2076-3417; 2076-3417
• DOI: 10.3390/app12052284

The quality of sleep during lunch breaks will affect the work efficiency, concentration, and mood of workers, and then increase the performance of workers. In this study, Dynamic CCT lighting is proposed as a method to control sleep quality, and a novel hypnotic lighting system is developed according to the experimental design. Pulse width modulation(PWM) is used for controlling sleep lights and adjusting and controlling the spectrum intensity of polychromatic LED to realize the color mixing, which conforms to CCT, illumination, uniformity, and other parameters in the experimental design. The control group of this study is in a dark room, and the experimental group is given dim light and Dynamic CCT lighting. Through volunteer psychological questionnaire evaluation, objective Sleep Wrist Actigraphy and Heart Rate Variability (HRV) are used analyzing sleep quality and Autonomic Nervous System (ANS). The result is found that the sleep environment with Dynamic CCT lighting is better than that with Dim light in three kinds of sleep lighting environments, while the sleep environment of Dynamic CCT lighting is very similar to that of a dark room. In terms of work efficiency after sleep, Dynamic CCT used in the sleep environment of lighting and Dim light is significantly better than that in a dark room.