Fasting and energy intake influence bone turnover in lightweight male rowers

Shawn M. Talbott, Sue A. Shapses

Research output: Contribution to journalArticlepeer-review

30 Scopus citations


The purpose of this study was to investigate the influence of an acute 24-hr fast versus usual 24-hr dietary intake on markers of bone turnover in collegiate lightweight male rowers. Bone turnover was measured by serum osteocalcin (OC) and urinary excretion of pyridinium cross-links (pyridinoline [PYD] and deoxypyridinoline [DPD]). Fasting subjects (F) (n = 14) reduced body weight by 1.7±0.5 kg but there was no significant change among nonfasting subjects (NF)(n=13). Following 24 hr of fasting, PYD and DPD were lower in F(14.1± 2.2 and 5.2±0.7 nmol/mmol creatinine, respectively) compared to NF (16.4± 3.6 and 6.0±0.8 nmol/mmol creatinine) (p < .05). Fasting also reduced OC levels (4.8±0.4 ng/ml) compared to NF (6.1±0.9 ng/ml) (p < .01). Stepwise regression analysis of NF dietary intake indicated that energy intake explained a greater portion of the variation in bone turnover for PYD (34%), DPD (36%), and osteocalcin (46%) compared to other nutrients (p < .05). These results indicate that bone turnover is reduced by 24 hr of fasting and suggest a role for dietary energy intake in regulating bone turnover.

Original languageEnglish (US)
Pages (from-to)377-387
Number of pages11
JournalInternational Journal of Sport Nutrition and Exercise Metabolism
Issue number4
StatePublished - Dec 1998

All Science Journal Classification (ASJC) codes

  • Medicine (miscellaneous)
  • Orthopedics and Sports Medicine
  • Nutrition and Dietetics


  • Athletes
  • Nutrition
  • Osteocalcin
  • Pyridinium cross-links
  • Starvation

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