男子青少年公路自行车运动员蛋白质摄入和体内氮平衡关系研究

The Relationships between Protein Intake and Nitrogen Balance in Junior Road Cyclists

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。

This study intended to determine the protein intake and nitrogen balance in 10 healthy male non-active adolescents and 11 junior male road cyclists, both groups aged about 15 years old. The results showed that the dietary intake were quite inappropriate in terms of energy, unsaturated free fatty acids, some minerals （calcium, magnesium, zinc and copper）, vitamins （D,C and E） and fibre in both groups. A positive nitrogen balance was observed from a daily protein intake of more than 1.6g/kg.body mass in these cyclists.