Sitting idle during the winter months will damage the health of arthritis patients, according to a Northwestern Medicine study.
It has been discovered that daily physical activity is vital to improve the health of people with arthritis.
Professor Joe Feinglass, researchers at Northwestern University Feinberg School of Medicine, stated: "The lack of daylight hours in the winter had a huge effect on the participants [in the study].
"There's more than a three-hour difference in the amount of completely sedentary time each day ... during the months with less daylight."
To solve the problem Professor Feinglass advocates the creation of more cheap indoor physical activities that can be used by arthritis sufferers and older adults.
A high prevalence of vitamin D insufficiency and deficiency has also been found among patients with psoriatic arthritis by researchers at the University of Toronto.
Vitamin D is emitted by the sun and people with vitamin D deficiencies often experience an intensification of symptoms during the winter months.
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