A study of middle-aged and older men and women has found that compared with non-shift workers, shift workers performed less well on a test that doctors use to screen for cognitive impairment. However, people who had not been shift-working for at least five years completed the test just as well as non-shift workers. The study is published in the journal Neurobiology of Aging . The findings suggest it could take at least five years for previous shift workers to recover brain functions relevant to a test of cognitive performance.
