Changes in bone mineral content in male athletes

Mechanisms of action and intervention effects

Robert C. Klesges, Kenneth D. Ward, Mary L. Shelton, William B. Applegate, Edwin D. Cantler, Genaro M.A. Palmieri, Karen Harmon, James Davis

Research output: Contribution to journalArticle

101 Citations (Scopus)

Abstract

Objectives. - To determine changes in bone mineral content (BMC) in male athletes, to examine the mechanisms of changes, and to evaluate the effects of intervention. Design. - Dual-energy x-ray absorptiometry (DEXA) tests were administered over a 2-year period, and calcium loss during training was determined by analysis of sweat and urine. Calcium supplementation was administered during year 2. Setting. - A midsouth university. Participants. - Eleven members of a college Division I-A basketball team. Intervention. - Based on observed calcium loss, athletes received differential levels of calcium supplementation. Intervention commenced the week prior to the fall training season and continued through postseason play. Main Outcome Measure. - Changes in BMC. Results. - Total body BMC decreased 3.8% from preseason to midseason of year 1 (mean decrease, 133.4 g, P=.02), increased nonsignificantly by 1.1% (mean increase, 35.3 g, P=.22) during the offseason, but decreased an additional 3.3% during summer months when practices resumed (mean decrease, 113.1 g, P=.01). Dermal calcium loss averaged 422 mg per training session. From preseason to late summer, there was an overall decrease of 6.1% in total BMC and a 10.5% decrease in BMC of the legs. Calcium supplementation was associated with significant increases in BMC and lean body mass. Conclusions. - Bone loss is calcium related and exercise is positively related to BMC provided that calcium intake is sufficient to offset dermal loss.

Original languageEnglish (US)
Pages (from-to)226-230
Number of pages5
JournalJournal of the American Medical Association
Volume276
Issue number3
DOIs
StatePublished - Jul 17 1996

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Athletes
Bone Density
Calcium
Basketball
Skin
Sweat
Leg
X-Rays
Outcome Assessment (Health Care)
Urine
Exercise
Bone and Bones

All Science Journal Classification (ASJC) codes

  • Medicine(all)

Cite this

Klesges, R. C., Ward, K. D., Shelton, M. L., Applegate, W. B., Cantler, E. D., Palmieri, G. M. A., ... Davis, J. (1996). Changes in bone mineral content in male athletes: Mechanisms of action and intervention effects. Journal of the American Medical Association, 276(3), 226-230. https://doi.org/10.1001/jama.276.3.226

Changes in bone mineral content in male athletes : Mechanisms of action and intervention effects. / Klesges, Robert C.; Ward, Kenneth D.; Shelton, Mary L.; Applegate, William B.; Cantler, Edwin D.; Palmieri, Genaro M.A.; Harmon, Karen; Davis, James.

In: Journal of the American Medical Association, Vol. 276, No. 3, 17.07.1996, p. 226-230.

Research output: Contribution to journalArticle

Klesges, RC, Ward, KD, Shelton, ML, Applegate, WB, Cantler, ED, Palmieri, GMA, Harmon, K & Davis, J 1996, 'Changes in bone mineral content in male athletes: Mechanisms of action and intervention effects', Journal of the American Medical Association, vol. 276, no. 3, pp. 226-230. https://doi.org/10.1001/jama.276.3.226
Klesges, Robert C. ; Ward, Kenneth D. ; Shelton, Mary L. ; Applegate, William B. ; Cantler, Edwin D. ; Palmieri, Genaro M.A. ; Harmon, Karen ; Davis, James. / Changes in bone mineral content in male athletes : Mechanisms of action and intervention effects. In: Journal of the American Medical Association. 1996 ; Vol. 276, No. 3. pp. 226-230.
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