Vitamin D Status and Muscle Function in Post-Menarchal Adolescent Girls

J Clin Endocrinol Metab. 2009 Feb;94(2):559-63. doi: 10.1210/jc.2008-1284. Epub 2008 Nov 25.

Abstract

Context: There has been a resurgence of vitamin D deficiency among infants, toddlers, and adolescents in the United Kingdom. Myopathy is an important clinical symptom of vitamin D deficiency, yet it has not been widely studied.

Objective: Our objective was to investigate the relationship of baseline serum 25 hydroxyvitamin D [25(OH)D] concentration and PTH with muscle power and force.

Design: This was a cross-sectional study.

Setting: The study was community based in a secondary school.

Participants: A total of 99 post-menarchal 12- to 14-yr-old females was included in the study.

Main outcome measures: Jumping mechanography to measure muscle power, velocity, jump height, and Esslinger Fitness Index from a two-legged counter movement jump and force from multiple one-legged hops was performed. Body height, weight, and serum concentrations of 25(OH)D, PTH, and calcium were measured.

Results: Median serum 25(OH)D concentration was 21.3 nmol/liter (range 2.5-88.5) and PTH 3.7 pmol/liter (range 0.47-26.2). After correction for weight using a quadratic function, there was a positive relationship between 25(OH)D and jump velocity (P = 0.002), jump height (P = 0.005), power (P = 0.003), Esslinger Fitness Index (P = 0.003), and force (P = 0.05). There was a negative effect of PTH upon jump velocity (P = 0.04).

Conclusion: From these data we conclude that vitamin D was significantly associated with muscle power and force in adolescent girls.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adolescent
  • Adolescent Nutritional Physiological Phenomena
  • Athletic Performance / physiology
  • Body Weight / physiology
  • Child
  • Cross-Sectional Studies
  • Female
  • Humans
  • Menarche* / blood
  • Menarche* / physiology
  • Muscle Strength / physiology
  • Muscle, Skeletal / physiology*
  • Parathyroid Hormone / blood
  • Vitamin D / blood*
  • Vitamin D Deficiency / physiopathology

Substances

  • Parathyroid Hormone
  • Vitamin D