Study under review: The effect of vitamin D supplement on the score and quality of sleep in 20-50 yearold people with sleep disorders compared with control group
The optimal amount of sleep varies from person to person. Most adults require at least seven hours per night on a regular basis. Sleeping less than this is associated with numerous adverse health outcomes, including cardiometabolic diseases, impaired immune function, impaired cognitive performance, and even death. Most people suffering from a lack of sleep tend to also have a lower satisfaction with their economic, social, and family situations, but certain disease states play a role as well. Insomnia is the most common specific sleep disorder, with approximately 30% of adults reporting problems with insomnia and approximately 10% suffering from chronic insomnia.
It has recently been hypothesised that vitamin D may play a role in maintaining good sleep and that chronically low levels of vitamin D could result in impaired sleep. Vitamin D’s theoretical interactions with sleep are summarized in Figure 1. However, direct investigations of the role of vitamin D supplementation in sleep disorders is lacking. Some studies have shown associations between low vitamin D levels in the blood and sleep quality. Other sleep disorders, such as obstructive sleep apnea, have also been associated with lower vitamin D levels. While this limited evidence is primarily observational, meaning we can't be sure about cause and effect, it was enough to inspire the study authors to investigate the potential effect of vitamin D supplementation on sleep quality in a randomised controlled trial.
Poor sleep is a common health concern that can affect quality of life and potentially have negative consequences for an individual’s health. Observational evidence has suggested a correlation between sleep quality and vitamin D levels, but the evidence is sparse and interventional evidence is lacking. This study is the first randomised control trial designed to investigate whether vitamin D supplementation improved sleep quality.
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Other Articles in Issue #34 (August 2017)
Interview: Brandon Roberts, PhD
In this volume, exercise scientist, coach, and research consultant Brandon Roberts talks with us about common mistakes he sees in strength training, the state of exercise science, and more.
Interview: Phil Graham, BSc, PGDip, CISSN, MSc(c)
Phil Graham lives and thrives with type 1 diabetes. In this interview, we pick his brain about his body building experience, tips for professionals working with athletes with type 1 diabetes, and the interactions between insulin, dietary protein, and muscle protein synthesis.
Beef protein: anabolic underdog?
Whey protein supplementation is considered a top contender when in comes to improving resistance training outcomes. Can a protein supplement derived from beef compete?
Lean beef: take it or leave it for weight loss
High-protein diets are one way to shed some pounds. Is red meat any better or worse of a protein source for those looking to lose weight?
Is there really no benefit from protein supplementation on weight loss maintenance?
There’s reason to think that protein supplementation can be helpful for weight loss. The question of whether it’s useful in weight maintenance is another matter
The effect of protein supplementation on muscle mass and strength
A recent systematic review has questioned the long-standing belief that protein supplementation can help improve strength training outcomes. This metaanalysis quantitatively examines the latest evidence on the issue
Ginger, vitamin B6 , or neither for nausea during pregnancy?
Ginger and vitamin B6 are commonly thought to be helpful for nausea and vomiting during pregnancy. Few trials have looked at them head-to-head, though.