Talks：

Circadian Rhythm of Shift Workers

Name：

鍾明慧(Min-Huey, Chung)

Position：

Vice Dean, Professor

Affiliation：

School of Nursing, College of Nursing, Taipei Medical University

Email：

minhuey300@tmu.edu.tw

Photo：

Research Interests：

Nursing, sleep, shift workers, light therapy, mental disorder

Selected Publications：

◆ Lee T.Y., Chang,P.C., Tseng I.J., Chung, M.H.* (2017, Oct). Nocturnal sleep mediates the relationship between morningness–eveningness preference and the sleep architecture of afternoon naps in university students. Plos One,12(10), e0185616. (SCI) ◆ Niu S.F., Miao N.F., Liao Y.M., Chi M.J., Chung M.H.*, Chou K.R.* (2017, Jul). Sleep quality associated with different work schedules: a longitudinal study of nursing staff. Biological research for nursing, 19(4), 375-381. (SCI) (equal contribution in corresponding authors) ◆ Chang Y., Lam C., Chen S.R., Sithole T., & Chung, M.H.* (2017, Apr). Seasonal variations in sleep disorders of nurses. Journal of Clinical Nursing, 26(7-8), 1085-1094. (SCI) ◆ Lam C, Lai F.C., Wang C.H., Lai M.H., Hsu N., & Chung M.H.* (2016, May). Text Mining of Journal Articles for Sleep Disorder Terminologies. Plos One, 11(5), e0156031. (SCI) ◆ Fang H.F., Sithole, T., Chen C.D., & Chung, M.H.* (2015, Sep). Risk of cancer in patients with insomnia, parasomnia, and obstructive sleep apnea：A Nationwide Nested Case-Control Study. Journal of Cancer,6(11), 1140-1147. (SCI) ◆ Kang, J.H., Sithole, T., Tseng, I.J., Chung, M.H.* (2015, May). Circadian Activity Rhythms and Sleep in Nurses Working Fixed 8-hr Shifts. Biological Research for Nursing, 17(3), 348-355. (SCI) ◆ Chou, T.L., Chang, L.I., Chung, M.H.*(2015, May). The mediating and moderating effects of sleep hygiene practice on anxiety and insomnia in hospital nurses. International Journal of Nursing Practice, suppl2, 9-18. (SCI) ◆ Chung, K.H., Li, C.Y., Kuo S.Y., Sithole T., Liu, W.W., Chung, M.H.* (2015, Apr). Risk of Psychiatric Disorders in Patients with Chronic Insomnia and Sedative-Hypnotic Prescription: A Nationwide Population-Based Follow-Up Study. Journal of Clinical Sleep Medicine, 11(5), 543-551. (SCI) ◆ Kung, P.Y., Chou, K.R., Lin, K.C. Hsu, H.W., Chung, M.H.* (2015, Feb).Sleep Disturbances in Patients with Major Depressive Disorder: Incongruence between Sleep Log and Actigraphy. Archives of Psychiatric Nursing, 29(1), 39-42. (SSCI) ◆ Chung, M.H.*, Liu, W.I., Lee, H.L., Hsu, N. (2013, Nov). Selected Neurophysiological, Psychological, and Behavioral Influences on Subjective Sleep Quality in Nurses: A Structure Equation Model. PLOS ONE, 8(11), e79529. (SCI)

Abstract：

Circadian rhythm maintains over 24h a day and the light/dark circle is the most obvious time cues of it. The timing of sleep takes a great part in circadian rhythm together with social cues, clock time, exercise, and food ingestion. There are several negative influences on shift work such as shortened and disturbed sleep. Every day shift workers expose to the 24h light/dark circle, but they possibly keep on circadian rhythms synthesized for alertness in accordance with their shifts. Therefore, without any intervention in their circadian rhythm, shift workers often fail on getting used to the sleep-wake schedule demanded by their occupation. Studies found that endogenous melatonin not only can be measured to estimate circadian phase, but synthetic exogenous melatonin also can be used to help shift workers adjust the shift circadian rhythm. Moreover, lights of suitable and spectral composition or intensity have the same effect on human body’s adaption to shift circadian rhythm. To be more precisely, light treatment before the melatonin peak would delay circadian rhythm and advance rhythm after then. Meanwhile, melatonin advances rhythm in the first half of biological night and delays them in the latter half. This lecture will first give an introduction to circadian principles and melatonin secretion within human sleep before talking about how light exposure and melatonin affect shift workers’ circadian. We will discuss what we have done for shift workers with research findings.