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少女多做跳跃运动有助延缓骨质疏松症发生
这一结论得自一项为期两年的研究。该研究让34名女生在学校上体育课时练习跳跃，而对照组的46名女生则不做此练习。
接受练习的女生要进行开合跳、从平台跳下和向前跳跃，并在跑道上做来回跑跳练习，跳跃的高度和冲击力度随研究的进行而增加。。
研究发现，在学期间每周进行三次练习的女生，骨质密度增加将近5%。
该研究由不列颠哥伦比亚儿童医院和不列颠哥伦比亚大学的学者完成，报告刊登在12月号美国儿科学会杂志《儿科学》（Pediatrics）期刊上。
研究负责人之一麦克凯伊（Heather McKay）在受访时表示，运动被认为是骨骼生长的刺激要素，甚至在子宫中常常踢腿或者活动的婴儿，也会有更强壮的骨骼。
Pediatrics. 2003 Dec;112:E447.
A School-Based Exercise Intervention Elicits Substantial Bone Health Benefits: A 2-Year Randomized Controlled Trial in Girls.
MacKelvie KJ, Khan KM, Petit MA, Janssen PA, McKay HA.
Endocrinology and Diabetes Unit, British Columbia Children's Hospital and Food, Nutrition and Health. School of Human Kinetics. Faculty of Medicine. Department of Health Care and Epidemiology, University of British Columbia, Vancouver, BC, Canada. Department of Health Evaluation Sciences, Pennsylvania State University College of Medicine, Hershey, Pennsylvania.
OBJECTIVE: Childhood weight-bearing physical activity is recognized as an important determinant of peak bone mass, and physical activity intervention may represent a feasible strategy for primary prevention of osteoporosis. Previous school-based exercise interventions have all been of <10 months in duration. We implemented a high-impact, circuit-based, jumping intervention (10 minutes, 3 times a week) over 2 school years and compared changes in bone mineral content (BMC) over 20 months (2 school years) in 9.9 +/- 0.6-year-old intervention girls (N = 32) and controls (10.3 +/- 0.4 years, N = 43). METHODS: We measured BMC for the total body, lumbar spine, proximal femur (and femoral neck and trochanteric subregions), and lean and fat mass by dual-energy radiograph absorptiometry (Hologic QDR 4500), and height, sitting height, leg length, and weight at baseline and 20 months. We assessed Tanner stage, general physical activity, and calcium intake by questionnaire. RESULTS: Girls were Tanner breast stage 1 to 3 at baseline. There were no significant differences in baseline or 20-month change in body size or composition, average physical activity, or calcium intake between groups. There were substantially greater gains in lumbar spine (41.7% vs 38.0%) and femoral neck (24.8% vs 20.2%) BMC in intervention than in control girls (P <.05, analysis of covariance; covariates were baseline BMC and height, change in height, physical activity, and final Tanner stage). CONCLUSION: Three brief sessions of high-impact exercise per week implemented over 2 consecutive years within the elementary school curriculum elicited a substantial bone mineral accrual advantage in pubertal girls.
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作者:admin@医学,生命科学 2011-06-29 18:20
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