ChildrenVitamin D

Vitamin D, muscle function, and adolescent girls

 The objective of this study was to investigate the relationship between vitamin D blood levels [25(OH)D] and parathyroid hormone (PTH) vs muscle power and force in girls attending secondary schools.

First, the details.

  • 99 girls, 12- to 14-years-old, participated.
  • A series of studies to measure muscle power, velocity, and jump height was performed.
  • The Esslinger Fitness Index (efficiency and asymmetry of movement, and maximum voluntary force of each leg) was recorded.
  • Body height, weight, and blood levels of 25(OH)D and PTH were measured.

And, the results.

  • After correction for weight, higher 25(OH)D levels were associated with significantly greater jump velocity, jump height, power, Esslinger Fitness Index, and force.
  • Higher PTH was associated with significantly weaker jump velocity.
    • When people are vitamin D deficient, the PTH levels increase.

The bottom line?
The authors, who were from the University of Manchester, in the UK concluded, “Vitamin D was significantly associated with muscle power and force in adolescent girls.”

4/9/09 22:37 JR

Hi, I’m JR

John Russo, Jr., PharmD, is president of The MedCom Resource, Inc. Previously, he was senior vice president of medical communications at, a complementary and alternative medicine website.