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Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules
INTRODUCTION: A two-shift work schedule with different rotations is common among firefighters in Iranian petrochemical companies. This study compared salivary melatonin and sleepiness on the last night before turning to day shift at 19:00, 23:00, 3:00, and 7:00 among petrochemical firefighters (PFFs...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Ubiquity Press
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5853812/ https://www.ncbi.nlm.nih.gov/pubmed/30210561 http://dx.doi.org/10.5334/jcr.155 |
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author | Kazemi, Reza Zare, Sajad Hemmatjo, Rasoul |
author_facet | Kazemi, Reza Zare, Sajad Hemmatjo, Rasoul |
author_sort | Kazemi, Reza |
collection | PubMed |
description | INTRODUCTION: A two-shift work schedule with different rotations is common among firefighters in Iranian petrochemical companies. This study compared salivary melatonin and sleepiness on the last night before turning to day shift at 19:00, 23:00, 3:00, and 7:00 among petrochemical firefighters (PFFs) working seven and four consecutive night shifts. METHODS: Sixty four PFFs working in the petrochemical industry were selected. To measure melatonin, saliva samples were taken, whereas the KSS index was used to assess sleepiness. Chi-square and independent samples t-test were carried out to analyze the data, and generalized linear model (GLM) was employed to determine the effect of confounding factors such as lighting and caffeine. RESULTS: The levels of melatonin at 3:00 and 7:00, and the overall changes during the shift in the two shift patterns under the study were different (P < 0.05). Sleepiness was significantly different only at 3:00 in the two studied shift patterns, while the effects of lighting and caffeine on melatonin changes were not significant (P > 0.05). CONCLUSION: It seems that a slow shift rotation is better because it reduces the secretion of melatonin (hence reducing sleepiness during the night) and changes the peak of melatonin secretion to the daytime, which is a sign of adaptation. |
format | Online Article Text |
id | pubmed-5853812 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Ubiquity Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-58538122018-03-27 Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules Kazemi, Reza Zare, Sajad Hemmatjo, Rasoul J Circadian Rhythms Research Article INTRODUCTION: A two-shift work schedule with different rotations is common among firefighters in Iranian petrochemical companies. This study compared salivary melatonin and sleepiness on the last night before turning to day shift at 19:00, 23:00, 3:00, and 7:00 among petrochemical firefighters (PFFs) working seven and four consecutive night shifts. METHODS: Sixty four PFFs working in the petrochemical industry were selected. To measure melatonin, saliva samples were taken, whereas the KSS index was used to assess sleepiness. Chi-square and independent samples t-test were carried out to analyze the data, and generalized linear model (GLM) was employed to determine the effect of confounding factors such as lighting and caffeine. RESULTS: The levels of melatonin at 3:00 and 7:00, and the overall changes during the shift in the two shift patterns under the study were different (P < 0.05). Sleepiness was significantly different only at 3:00 in the two studied shift patterns, while the effects of lighting and caffeine on melatonin changes were not significant (P > 0.05). CONCLUSION: It seems that a slow shift rotation is better because it reduces the secretion of melatonin (hence reducing sleepiness during the night) and changes the peak of melatonin secretion to the daytime, which is a sign of adaptation. Ubiquity Press 2018-02-21 /pmc/articles/PMC5853812/ /pubmed/30210561 http://dx.doi.org/10.5334/jcr.155 Text en Copyright: © 2018 The Author(s) http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution 4.0 International License (CC-BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. See http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Research Article Kazemi, Reza Zare, Sajad Hemmatjo, Rasoul Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title | Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title_full | Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title_fullStr | Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title_full_unstemmed | Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title_short | Comparison of Melatonin Profile and Alertness of Firefighters with Different Work Schedules |
title_sort | comparison of melatonin profile and alertness of firefighters with different work schedules |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5853812/ https://www.ncbi.nlm.nih.gov/pubmed/30210561 http://dx.doi.org/10.5334/jcr.155 |
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