Vitamin D-status in young female athletes in relation to bone health and neuromuscular performance
Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
The present study aims to test vitamin D-status in young female athletes, with minimal sun exposure during the long winter period at north latitude, in relation to bone health and neuromuscular performance. The test subjects were 19 female elite soccer players between 13-16 years old. The study used a cross-sectional study design. The tests performed included isokinetic knee extensor and knee flexor strength, jump- and sprint tests, body composition by dual-energy X-ray absorptiometry (iDXA), and blood tests including serum 25(OH)D, β-crosslaps, parathyroid hormone and osteocalcin. Mean serum 25(OH)D was 50.5 ± 12.8 nmol/L, with more than half of the subjects displaying deficient (<50 nmol/L), and one third insufficient (52-72 nmol/L), levels of vitamin D. No correlation was found between serum 25(OH)D and measures relating to bone health. A significant negative correlation was found between serum 25(OH)D and time to peak torque in the knee extensors at 90 degrees per second (r= -0.503, p = 0.028).
In conclusion, young female soccer players at northern latitude had a large prevalence of vitamin D insufficiency and deficiency during the winter. High levels of vitamin D correlated with the ability to produce torque in a short amount of time in the knee extensors. More research is needed in examining the effects on vitamin D on bone health and neuromuscular performance in athletes. However, these findings indicate that vitamin D supplementation may be needed in this population during the winter.
Place, publisher, year, edition, pages
2013. , 18 p.
Vitamin D, soccer, bone health, neuromuscular performance.
D-vitamin, fotboll, idrottsmedicin
Sport and Fitness Sciences
IdentifiersURN: urn:nbn:se:umu:diva-91510OAI: oai:DiVA.org:umu-91510DiVA: diva2:736758
Master program in Sports Medicine
Svensson, Michael, Universitetslektor
Malm, Christer, Universitetslektor