Effects of sleep on sarcopenia in individuals with metabolic syndrome: A systematic review

Sarcopenia and metabolic syndrome are present in a large percentage of the elderly population throughout the world. Much of its management is focused on primary prevention, and considering that sleep disturbances also accompany the same aging process associated with these two pathologies, we propose a relationship between sleep impairment and the development of sarcopenia in individuals with metabolic syndrome. A search was carried out in databases following he PRISMA scheme, obtaining fifteen studies. As for the main results: four of eight studies referring to sleep duration relate more than nine hours of sleep with an increased risk of sarcopenia, three of the five studies relate poorer sleep quality with worse body composition data or increased risk of sarcopenia and two studies related late chronotype with a higher risk of sarcopenia and metabolic syndrome. After analyzing the disparity of outcomes, it is necessary to homogenize methodologies to compare the different results.