Journal of Preventive Medicine and Public Health

The Korean Society for Preventive Medicine (대한예방의학회)
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Distribution of Calcaneal Bone Density According to the Mechanical Strain of Exercise and Calcium Intake in Premenarcheal Girls

초경전 여아에서 운동의 기계적 스트레인과 칼슘섭취량에 따른 발꿈치뼈 골밀도의 분포

  • Shin, Eun-Kyung (School of Public Health and Institute of Health and Environment, Seoul National University) ;
  • Kim, Ki-Suk (School of Public Health and Institute of Health and Environment, Seoul National University) ;
  • Kim, Hee-Young (School of Public Health and Institute of Health and Environment, Seoul National University) ;
  • Lee, In-Sook (College of Nursing, Seoul National University) ;
  • Joung, Hyo-Jee (School of Public Health and Institute of Health and Environment, Seoul National University) ;
  • Cho, Sung-Il (School of Public Health and Institute of Health and Environment, Seoul National University)
  • 신은경 (서울대학교 보건대학원 및 보건환경 연구소) ;
  • 김기숙 (서울대학교 보건대학원 및 보건환경 연구소) ;
  • 김희영 (서울대학교 보건대학원 및 보건환경 연구소) ;
  • 이인숙 (서울대학교 간호대학) ;
  • 정효지 (서울대학교 보건대학원 및 보건환경 연구소) ;
  • 조성일 (서울대학교 보건대학원 및 보건환경 연구소)
  • Published : 2005.09.01
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Abstract

Objectives : The effects of exercise on bone density have been found to be inconsistent in previous studies. We conducted a cross-sectional study in premenarcheal girls to test two hypotheses to explain these inconsistencies. Firstly,'the intensity of mechanical strain, in terms of the ground reaction force(GRF), has more important effects on the bone mass at a weight-bearing site', and secondly, 'calcium intake modifies the bone response to exercise'. Methods : The areal bone mineral density was measured at the Os calcis, using peripheral dual energy X-ray absorptiometry, in 91 premenarcheal girls aged between 9 and 12 years. The intensity of mechanical strain of exercise was assessed by a self-report questionnaire and scored by the GRF as multiples of body weight, irrespective of the frequency and duration of exercise. The energy and calcium intake were calculated from the 24-hour dietary recall. An analysis of covariance(ANCOVA) was used to determine the interaction and main effects of exercise and calcium on the bone density, after adjusting for age, weight, height and energy intake. Results : The difference in the bone density between moderate and low impact exercise was more pronounced in the high than low calcium intake group. The bone density for moderate impact exercise and high calcium intake was significantly higher than that for low impact exercise (p=0.046) and low calcium intake, after adjusting for age, weight, height and energy intake. Conclusions : Our study suggests that the bone density at a weight-bearing site is positively related to the intensity of mechanical loading exercise, and the calcium intake may modify the bone response to exercise at the loaded site in premenarcheal girls.

Keywords

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