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Determined of Stress Fracture and Bone Mass in Elite Military Cadets

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Annual rept. 15 Jul 1999-14 Jul 2000

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The objective of this study is to determine the major predictors of stress fracture and peak bone mass in elite military cadets entering the USMA class of 2002. The initial cadet sample size was 851 and baseline data included demographic information as well as dietary assessment, physical activity, lifestyle information, and menstrual function history during the year prior to entry to the academy. Upon entry to USMA, measurements on the cohort included dual x-ray absorptiometry OXA of the calcaneus Lunar PIXI, peripheral QCT of the tibia Norland pQCT and central UXA of the spine and hip on a subset of cadets. Annual dietary assessments, menstrual function assessment in females and bone density measures at heel, tibia, spine and hip have been performed annually on 786 cadets in the summer of 1999 and 527 cadets in the summer of 2000. Body composition was measured in the full cohort, using the Tanita 305 total body fat analyzer in 1999 and in 2000. The Orthopedics department on post has diagnosed stress fractures and the diagnoses are adjudicated at Helen Hayes Hospital by review of cadet sick call data and review of x-ray or bone scan reports. From summer 1998 at cadet basic training through June of 2000, there have been 94 stress fractures diagnosed and 72 stress reactionpossible fractures awaiting confirmation. For confirmed stress fractures, the female annual incidence is 14 and male incidence is 3.7. For as yet unconfirmed cases or stress reactions, there are an additional 10 female and 3 male incidence. The data are currently being evaluated for the major factors other than gender which influence the risk of stress fracture. In both genders, baseline calcaneal, spine and hip BMD values were approximately one standard deviation above young normal at age 20.

Subject Categories:

  • Personnel Management and Labor Relations
  • Biology
  • Stress Physiology

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