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

Chien-Yu Chen,Hung-Wei Chen

doi:10.3390/app12052284

Abstract

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.

Highlights

Office workers in Taiwan, under the pressure of long working hours and heavy workload, are seriously troubled by sleep
In the part of Heart Rate Variability (HRV) analysis [14], because the spectrum related to the autonomic nervous system mainly falls in high frequency power (HFP) and low frequency power (LFP), the normalized low frequency power and normalized high frequency power in this experiment are taken as the analysis standard, and low frequency to high frequency ratio (L/H) usually represents the balance of sympathetic/parasympathetic activities, as a reference index to observe the relaxation and hyperactivity of the autonomic nervous system
Compared with the Dynamic Correlated Color Temperature (CCT) l1i0gohf 1t6ing environment and the dim light environment, the normalized high frequency power (nHFP) One-Way ANOVA statistics show that the p-value of 15–2en5vmiroinnmeinst.0W.0e0c6an, steheefrpom-vFaigluuree 8otfha3t0th–e4s0tatmistiicnalirses0u.l0ts0o7f,DaynnadmitchCeCTp-livghatliunge of 50–60 min is 0.02. the sftraomtis15titcoa2l5 mreinsuarletbsetotefr athlalnpd-avrkarlouoemsawndedrime lliegshts, 1t5h–a25nmtihn,e30s–i4g0nmiifni,c5a0–n6c0emline,vel of α = 0.05

Summary

Introduction

Office workers in Taiwan, under the pressure of long working hours and heavy workload, are seriously troubled by sleep. Research and development personnel and shift workers, with long working hours, frequent business trips, and theier role in decision making, have to suffer from high responsibilities and pressure, so the insomnia conditions might be worse than general laborers [1]. Insomnia is a common problem nowadays that affects people’s health, spirit, emotion, and behavior. Chronic insomnia could even result in serious problems. In adequate rest can worsen physical conditions and result in more diseases. A lot of people try medication but it induces lots of bad side effects [2,3]

Methods

Results

Discussion

Conclusion