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any preferred this pattern because it got them into the habit of night time sleeping before they went home.
However, the researchers found it was worse for their health.
Urine tests from men working the split shift pattern showed levels of melatonin, a hormone which regulates sleep and which is normally secreted at night, did not become synchronised to new sleep times after shift changes.
The men also had higher levels of fatty acids circulating in their blood after meals, compared with the day shift or adapted workers, indicating they were at higher risk of heart disease, diabetes and other metabolic disorders.
Josephine Arendt, a chronobiologist from Authentic coach purses discount the University of Surrey, who carried out one of the studies, told New Scientist magazine: "The swing shift is the killer."
Andrew Cute cheap coach purses Smith of Cardiff University, Cheap coach checkbook wallet who carried out the second study, said workers should try to avoid split shifts and other schedule changes that put their body clocks out of kilter.
He said legislation which forced companies to stick to particular schedules was unlikely, but he said people who did Coach handbag clearance work split shifts could minimise the Cheap coach factory store risks to their health by avoiding fatty and sugary snacks