Due to the site upgrade, your MY ACCOUNT logins will need to be updated. Please access Forgot Your Password to make this change. If you do not have an account, click here.

Vitamin D linked to girl power

Feb 12, 2009

Low levels of vitamin D may reduce the muscle power and force in adolescent girls, according to a new study from the UK. The researchers from the University of Manchester report that the vitamin D levels of 99 adolescent girls between the ages of 12 and 14 was linked with muscle power and force. “We know vitamin D deficiency can weaken the muscular and skeletal systems, but until now, little was known about the relationship of vitamin D with muscle power and force,” said lead author of the study Kate Ward, PhD. “Our study found that vitamin D is positively related to muscle power, force, velocity and jump height in adolescent girls.”  

The reseachers found that blood samples from the girls showed that the average vitamin D levels were 21.3 nanomoles per litre (nmol/L), and ranged from 2.5 to 88.5 nmol/L. While none of the girls had any physical symptoms of vitamin D deficiency, the researchers report that 75 per cent of the screened population had low active vitamin D levels (25(OH)D levels). Muscle strength and force were measured using a technique called jumping mechanography which derives power and force measurements from a subjects performance in a series of jumping activities. The researchers report that girls without vitamin D deficiency performed significantly better in the jumping-force test. The study is published in the February 2009 issue of the Journal of Clinical Endocrinology & Metabolism.