Urinary levels of cross-linked N-terminal telopeptide of type i collagen and nutritional status in Japanese professional baseball players

Jun Iwamoto, Tsuyoshi Takeda, Kazuhiro Uenishi, Hiromi Ishida, Yoshihiro Sato, Hideo Matsumoto

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The objective of the present study was to investigate the nutritional status from the aspect of bone metabolism in Japanese elite male athletes with increased bone resorption. Urinary levels of a bone resorption marker, cross-linked N-terminal telopeptide of type 1 collagen (NTX), were measured in 71 professional baseball players (age, 18-39 years); the mean urinary NTX level was 65.6 (range, 17.5-269.0) nM BCE/mM Cr. Of 71 athletes, 9 with high levels of urinary NTX (greater than mean + 1 SD) were examined by measuring serum biochemical markers and nutritional assessment (simple food frequency questionnaire). Serum biochemical marker analysis showed that 7 of these 9 athletes had vitamin D insufficiency, as indicated by low serum levels of 25-hydroxyvitamin D, and that all 9 athletes showed vitamin K insufficiency as indicated by low levels of vitamins K1 and K2. Nutritional assessment revealed high intakes of protein and low intakes of calcium and vitamin D based on adequate intake (AI). However, daily vitamin K intake achieved the AI. These results suggest that there exist elite male athletes who show increased bone resorption and calcium and vitamin D insufficiency. However, there was a discrepancy between vitamin K intake and serum levels of vitamins K1 and K2. The present study raised an issue regarding the nutritional status from the point of view of bone metabolism in elite male athletes such as professional baseball players.

Original languageEnglish
Pages (from-to)540-546
Number of pages7
JournalJournal of Bone and Mineral Metabolism
Volume28
Issue number5
DOIs
Publication statusPublished - 2010 Sep 1

Keywords

  • Calcium
  • Elite athletes
  • Urinary NTX
  • Vitamin D
  • Vitamin K

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine
  • Endocrinology

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