Effects of different cabin light conditions on sleep quality and salivary melatonin levels
Objective To explore the effects of different cabin light conditions on the sleep quality and levels of salivary melatonin,and to provide theoretical evidence for improving the living conditions of a warship and ensuring the health of the crew.Methods A total of 78 sailors with sleep disorders from a warship were selected as the study subjects.They were divided into test group and control group by the random number table method,with 39 participants in each group.In the test group,the crew quarters lights were replaced with warm white light tubes with a color temperature of 4 000 K,and the bedside lamps were replaced by warm yellow light tubes with a color temperature of 2 700 K;while the crew quarters in the control group still used the original cold white light tubes with high color temperature.In all the work places,cold white light tubes with high color temperature were still used.This study lasted for 15 days.Pittsburgh sleep quality index(PSQI),self-rating eye fatigue scale,and self-rating anxiety scale(SAS)were used to evaluate the degree of sleep disorder,eye fatigue,and anxiety of the crew before and after the experiment respectively.Enzyme-linked immunosorbent assay(ELISA)was used to detect the salivary melatonin level of the sailors before and after the experiment.Results A total of 72 sailors completed the experiment,with 38 in the test group and 34 in the control group.The scores of PSQI scale in the test group were significantly lower than those before intervention(P＜0.05).There was no statistically significant difference in the PSQI scale results of the control group before and after the experiment.There were also no statistically significant differences(P＞0.05)in the eye fatigue self-test scale,SAS score,and salivary melatonin levels before and after the experiment in the test or control groups.However,after the experiment,the salivary melatonin levels of the subjects ≤26 years old increased in the test group,and the PSQI scores of the subjects＞26 years old decreased in the test group,with statistically significant differences(P＜0.05).Conclusion The melatonin level and sleep quality of the crew can be significantly improved by optimizing the lighting condition in the crew quarters without affecting the daily routine.
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