What type of study is this?

This is a Longitudinal Study study.

September 5, 2025Frontiers in Public HealthOpen Access

Effects of a 12-hour shift system on sleep and cardiovascular health of male machine and plant operators – a longitudinal study over four years

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Longitudinal study found 12-hour shifts affect sleep but not cardiovascular health in operators, indicating work-life balance benefits.

At T5, 12-hour shifts significantly changed sleep behavior but showed no improvement in cardiovascular health.
Sleep quality and duration were worse in shift workers at T5, with an average sleep duration of just 318 minutes.
Longitudinal analysis revealed higher blood pressure and BMI in shift workers at T1, further confirmed at T5.
Both shift and day workers reported fewer impairments and improved life satisfaction over the study period.

Seibt et al. (2025) studied this question.

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