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May Young Elite Cyclists Have Less Efficient Bone Metabolism?

Marta Rapún-López1, Hugo Olmedillas2, Alejandro Gonzalez-Agüero3,4,5,6

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Competitive cycling in adolescents did not alter bone remodeling markers. However, cyclists experienced a significant decrease in vitamin D levels, potentially impacting long-term bone health.

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Area of Science:

  • Sports Medicine
  • Bone Physiology
  • Endocrinology

Background:

  • Adolescent athletes may have unique physiological demands impacting bone health.
  • Understanding bone metabolic activity in young competitive cyclists is crucial for long-term skeletal integrity.
  • Longitudinal studies are needed to track changes in bone turnover markers in response to intense training.

Purpose of the Study:

  • To investigate longitudinal changes in bone metabolic markers in adolescent male cyclists versus controls.
  • To compare bone formation and resorption markers between cyclists and age-matched non-athletes.
  • To assess the impact of one year of competitive cycling on vitamin D status.

Main Methods:

  • Longitudinal study involving 8 adolescent male cyclists and 8 age-matched controls.
  • Measurement of serum osteocalcin (OC), propeptide of type I procollagen (PINP), and beta-isomerized C-telopeptides (β-CTx).
  • Analysis of plasma 25 hydroxyvitamin D [25(OH)D] using electrochemiluminescence immunoassay.

Main Results:

  • No significant differences in bone formation (OC, PINP) or resorption (β-CTx) markers between cyclists and controls.
  • Both groups showed significant decreases in OC and PINP over the year.
  • Cyclists exhibited an 11% decrease in 25 hydroxyvitamin D, while controls did not.

Conclusions:

  • Competitive cycling in adolescent males does not appear to significantly alter bone remodeling markers over a one-year period.
  • The observed decrease in vitamin D in cyclists warrants attention as it may pose a risk to future bone health.
  • Further research is needed to explore the long-term skeletal consequences of reduced vitamin D in young athletes.