Effects of chronotype on sleep, mood and cardiovascular circadian rhythms in rotating night shift medical workers

Mar 1, 2024International archives of occupational and environmental health

How natural sleep-wake preferences affect sleep, mood, and daily heart rhythms in rotating night shift medical workers

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Abstract

Among 208 rotating night shift workers, E-type chronotype is associated with increased fatigue, sleepiness, and altered cardiovascular rhythms.

E-type workers reported more fatigue and sleepiness compared to other chronotypes.
E-type chronotype exhibited less diastolic blood pressure dipping during the night.
Nighttime heart rate variability metrics, including RMSSD, LF, HF, and SD1, were higher in E-type workers.
Circadian analysis revealed elevated mesors for RMSSD and LF, and increased amplitude for SD2/SD1 in E-type individuals.

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PURPOSE: Whether chronotype affects the health outcomes of night shift work populations is unknown. This study aimed to assess the influence of different chronotypes in the rotating night shift population on sleep status, mood, blood pressure (BP), and heart rate variability (HRV), as well as the circadian rhythm of BP and HRV.

METHODS: A total of 208 rotating night shift workers were included. All participants completed structured questionnaires to assess chronotype, mood and sleep status. During their daily lives outside of the night shift, they underwent 24-hour Holter electrocardiogram monitoring and 24-hour ambulatory blood pressure monitoring. Day-time and night-time BP and BP dipping were obtained. Day-time and night-time HRV values (SDNN, RMSSD, LF, HF, LF nu, SD1, SD2 and SD2/SD1) were calculated and fitted to the cosine period curve. Three circandian parameters (mesor, amplitude and acrophase) were extracted to quantify the circadian rhythm of the HRV indices.

RESULTS: Among all three groups, E-type showed more fatigue and sleepiness. In addition, E-type showed blunted diastolic BP dipping. Notably, E-type showed association with higher RMSSD, LF, HF and SD1 in the night time, and higher mesors of RMSSD and LF and amplitude of SD2/SD1 in circadian analysis.

CONCLUSION: Chronotype is a factor affecting fatigue, sleepiness and cardiovascular circadian rhythms of rotating night shift workers. Chronotype should be taken into consideration for managing night-shift rotation to promote occupational health.

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Effects of chronotype on sleep, mood and cardiovascular circadian rhythms in rotating night shift medical workers

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