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对11名15岁的男子青少年公路自行车运动员和10名同性别同年龄段的普通青少年进行膳食调查和氮平衡测定,初步分析男子青少年公路自行车运动员的营养状况和蛋白质摄入量。结果发现,运动员组和对照组均存在能量摄入不足;脂肪摄入比例正常,但饱和脂肪酸和不饱和脂肪酸比例失调,不饱和脂肪酸比例偏低;钙、镁、铁、锌、铜、维生素D、维生素C、维生素E和总纤维素摄入不足。运动员组蛋白质摄入量在每日每公斤体重1.6g以上时可以保持正氮平衡。  相似文献
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Bioelectrical impedance vector-analysis (BIVA) describes cell-mass, cell function and hydration status of an individual or a group. The goal of the present investigation was to provide bioelectrical impedance data for 525 male road cyclists (155 professionals, 79 elite, 59 elite-youth, and 232 amateurs) at the time of their optimal performance level. Data were plotted on the resistance-reactance (R-Xc) graph to characterize cyclists group vectors using BIVA. Compared to the general male population, the mean vector position of the road cyclists indicates a higher body cell mass (BCM) and phase angle (p<0.001). The vector position of the high-performance, compared to the amateur cyclists showed similar patterns with higher BCM and phase angles and higher reactance values for the high-performance athletes (p<0.001). The bio-impedance data were used to calculate the 50%, 75%, and 95% tolerance ellipses of each group of cyclists. The characteristic vector positions of the road cyclists indicate normal hydration and greater muscle mass and function of the high-performance cyclists compared to amateur cyclists and the normal population. The cyclists specific tolerance ellipses, particularly the high-performance cyclists might be used for classifying a cyclist according to the individual vector position and to define target vector regions for lower level cyclists.  相似文献
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