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Deng S, Wang Q, Fan J, Lu J, Liu W, Wang W, Yang Y, Ding F, Mei J, Ba L. Association of intra-shift nap duration with heart rate variability in medical night shift workers. J Sleep Res 2024; 33:e13935. [PMID: 37226542 DOI: 10.1111/jsr.13935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 04/19/2023] [Accepted: 04/28/2023] [Indexed: 05/26/2023]
Abstract
Napping during night shifts effectively reduces disease risk and improves work performance, but few studies have investigated the association between napping and physiological changes, particularly in off-duty daily lives. Changes in the autonomic nervous system precede diseases like cardiovascular disease, diabetes, and obesity. Heart rate variability is a good indicator of autonomic nervous system. This study aimed to investigate the link between night shift nap durations and heart rate variability indices in the daily lives of medical workers. As indicators of chronic and long-term alterations, the circadian patterns of heart rate variability indices were evaluated. We recruited 146 medical workers with regular night shifts and divided them into four groups based on their self-reported nap durations. Heart rate variability circadian parameters (midline-estimating statistic of rhythm, amplitude, and acrophase) were obtained by obtaining 24-h electrocardiogram on a day without night shifts, plotting the data of the heart rate variability indices as a function of time, and fitting them into periodic cosine curves. Using clinical scales, depression, anxiety, stress, fatigue, and sleepiness were assessed. Linear regression analysis revealed a positive relationship between 61-120-min naps and 24-h, daytime, and night-time heart rate variability indices, and the parasympathetic activity oscillation amplitude (indexed by high-frequency power, the square root of the mean of the sum of squares of differences between adjacent normal intervals, standard deviation of short-term R-R-interval variability) within one circadian cycle. This study indicated that napping for 61-120 min during night shifts could benefit medical workers' health, providing physiological evidence to promote nap management.
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Affiliation(s)
- Saiyue Deng
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Quan Wang
- School of Nursing, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Jingjing Fan
- Cardiac Unit, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Jiajia Lu
- Cardiac Unit, Wuhan No.1 Hospital, Wuhan, People's Republic of China
| | - Wenhua Liu
- Department of Clinical Research Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Wei Wang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Yuan Yang
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
| | - Fengfei Ding
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
- Department of Pharmacology, Shanghai Medical College, Fudan University, Shanghai, People's Republic of China
| | - Junhua Mei
- Department of Neurology, Wuhan No.1 Hospital, Wuhan, People's Republic of China
| | - Li Ba
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People's Republic of China
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Zhu JL, Liu MY, Qin QR, He JL, Hu MJ, Zhu ZY, Liu JJ, Huang F. Association Between Night Shift and Hypertension: A Cross-Sectional Study in Chinese Adults. J Occup Environ Med 2023; 65:e36-e42. [PMID: 36735621 DOI: 10.1097/jom.0000000000002749] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
OBJECTIVE The purpose of this study was to explore the effect of night-shift work on the risk of hypertension for improving workers' health. METHODS A total of 10,038 Chinese participants were constituted in the cross-sectional study. Logistic regression and restricted cubic spline were used to estimate the effect of night shift on hypertension. RESULTS There were higher odds of having hypertension in any night-shift workers (odds ratio [OR], 1.16 [95% confidence interval, 1.03-1.30]) when compared with day workers. Having 5 to 10 night shifts per month were significantly more likely to be hypertensive (OR, 1.19 [95% confidence interval, 1.03-1.38]). The OR for hypertension increased as the number of night shifts increased as the result of the restricted cubic spline. CONCLUSIONS Our results support the hypothesis that night shift is associated with an elevated risk of hypertension.
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Affiliation(s)
- Jin-Liang Zhu
- From the Department of Epidemiology and Biostatistics, School of Public Health, Anhui Medical University, Hefei, Anhui, China (Mr Zhu, Ms Liu, Dr Qin, Mr He, Dr Hu, Mr Zhu, Mr Liu, Dr Huang); and Ma'anshan Center for Disease Control and Prevention, Ma'anshan, Anhui, China (Dr Qin)
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Honn KA. 24 th international symposium on shiftwork and working time: innovations in research and practice improving shiftworker health & safety. Chronobiol Int 2021; 37:1273-1282. [PMID: 33957058 DOI: 10.1080/07420528.2020.1831719] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Kimberly A Honn
- Sleep and Performance Research Center and Elson S. Floyd College of Medicine, Washington State University, Spokane, WA, USA
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