BACKGROUND: Studies addressing the relation of student's body composition and bone mineral density in late puberty are rare.rnOBJECTIVE: To explore the relationship of physical fitness and body composition of students in the late youth with the speed of sound (SOS).rnMETHODS: Quantitative ultrasound and bio-electrical impedance methods were applied in 1 004 students aged 17-20 years.rnRESULTS AND CONCLUSION: The physique and body composition of body students were significantly better than those of girl students. Students with different degrees of obesity had obvious physical changes: the higher the fat percentage, the worse the physical fitness. Fat percentage, muscle mass and muscle strength had a significant linear relationship with the SOS. These findings show that a clear gender difference exists between the physical fitness and body composition, but there is no gender difference in the SOS; students with different degrees of obesity has obvious physical differences, and the fat percentage in the normal range indicates the good physical fitness of students; the fat percentage is negatively correlated to the SOS, and the higher the fat percentage, the lower the bone mineral density that is influenced by muscle strength and muscle mass.%背景:查阅国内外研究文献发现研究青春发育后期学生体成分与骨密度的文章很少.目的:探讨处于青春后期的学生体质、体成分与跟骨超声传导速度的相互关系.方法:采用定量超声法和生物电阻抗法对在校的1 004名17~20周岁的学生进行了测试.结果与结论:男生的体质和体成分明显好于女生;肥胖度不同的学生,体质具有明显的层次变化,脂肪百分比越高则体质越差;脂肪百分比、肌肉量和肌力与跟骨超声传导速度具有显著的线性关系.结果可见体质和体成分具有明显的性别差异,但跟骨超声传导速度没有性别差异;肥胖度不同的学生体质具有明显的差异性,脂肪百分比处在正常范围之内的学生身体素质最好;脂肪百分比与跟骨超声传导速度呈负相关,脂肪百分比越高则骨密度越低,对骨密度大小起决定作用的是肌力和肌肉量.
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