Objective The effect of dietary restriction, intense exercise and menstrual dysfunction on bone mineral density remains controversial. The aim of this study was to assess the skeletal health status and relationship be...Objective The effect of dietary restriction, intense exercise and menstrual dysfunction on bone mineral density remains controversial. The aim of this study was to assess the skeletal health status and relationship between bone mineral density and nutrient intake, menstrual status, estrogen level and other factos in Chinese adolescent dancers. Methods Sixty dancers and 77 healthy controls underwent measurements of bone density, body composition, and estrogen level. Nutrient intake, menstrual status and physical activity were assessed with questionnaires. The correlation between these factors were analyzed. Results The dancers under study had a significantly lean body mass index （18.3±1.4 kg/m^2 vs. 21.7±3.1 kg/m^2）, lower percentage of body fat （0.25±0.05 vs. 0.34±0.04） and later age at menarche （14.0±0.9 y vs. 13.0±1.3 y）, and the estrogen level, daily calorie and fat intake in them were also lower than in the controls. All the dancers undertook intensive physical activity every day and up to 69% of them suffered from irregular menarche. Yet they had relatively high BMD and BMC of the total body and legs than the controls after adjusting for BM1 and age. Site-specific BMD was positively correlated to BMI, body composition and training hours per week and negatively correlated to the age at menarche and menstrual frequency. Conclusions The relatively high BMD and BMC of the dancers at the total body and legs were probably caused by high levels of weight-bearing physical activity. To ameliorate disordered eating, especially low energy intake might be helpful to prevent the Triad and to improve the bone health in adolescent dancers.展开更多
目的探讨不同月经状态女青少年游泳运动员骨密度(bone mineral density,BMD)状况。方法选择2005年9月到2008年9月16-18岁、泳龄≥3年女性青少年游泳运动员220例,采用LunarDPX-NT双能X线吸收法(DXA)对运动员腰椎L1-L4骨密度进行测定。结...目的探讨不同月经状态女青少年游泳运动员骨密度(bone mineral density,BMD)状况。方法选择2005年9月到2008年9月16-18岁、泳龄≥3年女性青少年游泳运动员220例,采用LunarDPX-NT双能X线吸收法(DXA)对运动员腰椎L1-L4骨密度进行测定。结果月经异常中骨密度的Z评分<-1者明显多于月经正常者(P<0.005)。结论月经异常者骨密度常降低,应减少活动量及改变饮食结构加以预防和纠正。展开更多
Objective:To explore the effect of age on body composition in healthy Beijing women. Methods:We measured body composition with dual-energy X-ray（GE Lunar Prodigy） in 316 healthy Beijing females aged 20 to 74 years（...Objective:To explore the effect of age on body composition in healthy Beijing women. Methods:We measured body composition with dual-energy X-ray（GE Lunar Prodigy） in 316 healthy Beijing females aged 20 to 74 years（5-7 women per age）.Parameters provided by the software were as following:total body bone mineral content（BMC）,lean mass（LM）,fat mass and fat mass percentage（FM%）.Local regions measured included arm,leg,trunk,android region and gynoid region.Body mass index（BMI）,fat mass index（FMI）,free fat mass index（FFMI） and A/G were calculated.Volunteers were assigned to 6 groups according to age by every ten years a group. Results:BMC peaked during the 4th decade,LM peaked during the 5th decade,with a decline of 18.1%and 5.2%respectively at age 74 years.Total body fat mass and FM%showed a general increase with aging throughout the studied age range.Total body fat mass increased from（16±5） kg at age 20-29 years to（24±6）kg at age 70-74 years,while FM%increased from 31.3%to 39.5%.All local region FM%increased with aging at different extents. Android region FM%showed the largest raise extent（32.2%）.BMI increased gradually from 21.1 kg/m2 at age 20-29 years to 26.1 kg/m2 at age 70-74 years.FMI changed more obviously than FFMI.A/G increased from 0.85 at age 20-29 years to 1.02 at age 70-74 years.Different menstrual status in women of 40-59 years had obvious effect on A/G and BMC（P<0.05）,while it had no significant effect on BMI,body weight and waist circumference （P>0.05）. Conclusion:Aging has a great effect on body composition distribution in healthy Beijing women.展开更多
基金supported by key projects of the national science & technology pillar program during the eleventh five-year plan period (2008BAI58B02)danone institute China diet nutrition & comunication grant proposal 2006(DIC 2006-4)
文摘Objective The effect of dietary restriction, intense exercise and menstrual dysfunction on bone mineral density remains controversial. The aim of this study was to assess the skeletal health status and relationship between bone mineral density and nutrient intake, menstrual status, estrogen level and other factos in Chinese adolescent dancers. Methods Sixty dancers and 77 healthy controls underwent measurements of bone density, body composition, and estrogen level. Nutrient intake, menstrual status and physical activity were assessed with questionnaires. The correlation between these factors were analyzed. Results The dancers under study had a significantly lean body mass index （18.3±1.4 kg/m^2 vs. 21.7±3.1 kg/m^2）, lower percentage of body fat （0.25±0.05 vs. 0.34±0.04） and later age at menarche （14.0±0.9 y vs. 13.0±1.3 y）, and the estrogen level, daily calorie and fat intake in them were also lower than in the controls. All the dancers undertook intensive physical activity every day and up to 69% of them suffered from irregular menarche. Yet they had relatively high BMD and BMC of the total body and legs than the controls after adjusting for BM1 and age. Site-specific BMD was positively correlated to BMI, body composition and training hours per week and negatively correlated to the age at menarche and menstrual frequency. Conclusions The relatively high BMD and BMC of the dancers at the total body and legs were probably caused by high levels of weight-bearing physical activity. To ameliorate disordered eating, especially low energy intake might be helpful to prevent the Triad and to improve the bone health in adolescent dancers.
文摘目的探讨不同月经状态女青少年游泳运动员骨密度(bone mineral density,BMD)状况。方法选择2005年9月到2008年9月16-18岁、泳龄≥3年女性青少年游泳运动员220例,采用LunarDPX-NT双能X线吸收法(DXA)对运动员腰椎L1-L4骨密度进行测定。结果月经异常中骨密度的Z评分<-1者明显多于月经正常者(P<0.005)。结论月经异常者骨密度常降低,应减少活动量及改变饮食结构加以预防和纠正。
文摘Objective:To explore the effect of age on body composition in healthy Beijing women. Methods:We measured body composition with dual-energy X-ray（GE Lunar Prodigy） in 316 healthy Beijing females aged 20 to 74 years（5-7 women per age）.Parameters provided by the software were as following:total body bone mineral content（BMC）,lean mass（LM）,fat mass and fat mass percentage（FM%）.Local regions measured included arm,leg,trunk,android region and gynoid region.Body mass index（BMI）,fat mass index（FMI）,free fat mass index（FFMI） and A/G were calculated.Volunteers were assigned to 6 groups according to age by every ten years a group. Results:BMC peaked during the 4th decade,LM peaked during the 5th decade,with a decline of 18.1%and 5.2%respectively at age 74 years.Total body fat mass and FM%showed a general increase with aging throughout the studied age range.Total body fat mass increased from（16±5） kg at age 20-29 years to（24±6）kg at age 70-74 years,while FM%increased from 31.3%to 39.5%.All local region FM%increased with aging at different extents. Android region FM%showed the largest raise extent（32.2%）.BMI increased gradually from 21.1 kg/m2 at age 20-29 years to 26.1 kg/m2 at age 70-74 years.FMI changed more obviously than FFMI.A/G increased from 0.85 at age 20-29 years to 1.02 at age 70-74 years.Different menstrual status in women of 40-59 years had obvious effect on A/G and BMC（P<0.05）,while it had no significant effect on BMI,body weight and waist circumference （P>0.05）. Conclusion:Aging has a great effect on body composition distribution in healthy Beijing women.
