Does Vitamin D Deficiency Cause Muscle Weakness

Vitamin D supplementation reduces the risk of dynapenia in older people by 78%, according to Researchers at the Federal University of São Carlos (UFSCar) in Brazil and University College London (UCL) in the United Kingdom. The findings of the research is published in the journal Calcified Tissue International and Musculoskeletal Research.

Dynapenia is an age-associated loss of muscle strength. It can be partially explained by muscle atrophy and is a major risk factor for physical incapacity later in life. People with dynapenia are more likely to fall, need to go to the hospital, be prematurely institutionalized, and die.

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‘Expose yourself to the sun, eat food rich in vitamin D or take a supplement, and do resistance training exercises to maintain muscle strength.’

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Researchers analyzed data for 3,205 non-dynapenic individuals aged 50 and over who were followed for four years by the English Longitudinal Study of Ageing (ELSA), a long-term multi-cohort study that began in 2002 and has had more than 15 years of follow-up.

Vitamin D is known to participate in various functions of the organism. It’s a hormone and its many roles include helping to repair muscles and releasing calcium for muscle contraction kinetics. It was therefore expected to cause muscle alterations of some kind. That’s exactly what was proved in this study.

Vitamin D Key to Muscle Strength in Older Adults

Bone and muscle tissue are interconnected not just mechanically and physically but also biochemically. Endocrine disorders such as vitamin D deficiency or insufficiency can lead to loss of bone mineral density as well as a reduction in muscle mass, strength, and function.

The study sample comprised individuals aged 50 and over without dynapenia. Grip strength (considered a good proxy for overall muscle strength) was 26 kg or more for men and 16 kg or more for women.

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The main finding was that individuals with vitamin D deficiency, defined as less than 30 nanomoles per liter in the blood, had a 70% higher risk of developing dynapenia by the end of the four-year study period than those with normal levels of vitamin D, defined as more than 50 nmol/L.

Though this is an important finding, researchers knew there are many worldwide cases of people with osteoporosis who take vitamin supplements, so they needed to try to measure the effectiveness of vitamin D supplementation.

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When individuals with osteoporosis and those taking vitamin D were excluded from the analysis, they found that the risk of developing muscle weakness by the end of the four years was 78% higher for subjects with vitamin D deficiency at the start of the study than for subjects with normal vitamin D levels and 77% higher for those with vitamin D insufficiency.

The results proved that the risk of muscle weakness is heightened by both vitamin D deficiency and insufficiency and also it is important to take vitamin D if you have a deficiency or insufficiency.

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Our body only synthesizes vitamin D when large areas of skin are exposed to sunlight. Hence, it is necessary to explain to people that they risk losing muscle strength if they don’t get enough vitamin D. They need to expose themselves to the sun, eat food rich in vitamin D or take a supplement, and do resistance training exercises.

Source-Eurekalert