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Vitamin D status and muscle function in post-menarchal adolescent girls
Kate A Ward1, Geeta Das, Jacqueline L Berry
1Imaging Science and Biomedical Engineering, University of Manchester, Manchester, United Kingdom. Kate.Ward@mrc-hnr.cam.ac.uk
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.
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