不同质蛋白对运动大鼠蛋白质及能量代谢的影响

观察了三种不同质的动、植物蛋白质组成的含蛋白质１７％的饲料对运动大鼠蛋白质及能量代谢的影响。实验取雄性断轧幼鼠３２只，随机等分为Ａ、Ｂ、Ｃ、Ｄ四组。饲料中蛋白质组成：Ａ组为１００％麦蛋白；Ｂ组酪蛋白１０％，麦蛋白９０％；Ｃ及Ｄ组均为酪蛋白４０％，麦蛋白６０％。Ａ、Ｂ、Ｃ组为观察不同质蛋白质对运动大鼠蛋白质及能量代谢的影响，Ｄ组为Ｃ组的安静对照组。观察指杯有体重、氮平衡、骨骼肌氮、血清尿素氮、血糖、血乳酸、肌糖元、肌轧酸脱氢酶、肌ＡＴＰ和肌Ｃａ２＋－ＡＴＰ酶活性。结果表明：１．不同质蛋白影响大鼠蛋白质代谢。Ａ组蛋白质最差、运动后大鼠呈负氮平衡，且血清尿素氮含量较高，肌氮较低，表明蛋白质分解代谢增强。２．不同质蛋白也影响大鼠能量代谢，Ｃ组蛋白质较好，运动时消耗了较多的肌糖原，产生较多的ＡＴＰ；ＬＤＨ和Ｃａ２－ＡＴＰ酶活性较高。３．相同质蛋白的Ｃ、Ｄ组，运动的Ｃ组在能量的产生及酶活性等方面，其数值稍高于安静对照的Ｄ组。４．从蛋白质及能量代谢看，以酪蛋白与麦蛋白４：６为适宜。

THE EFFECT OF PROTEIN QUALITY ON PROTEIN AND ENERGY METABOLISM IN EXERClSCISE

he effect of protein quality on protein and energy metabolism of ratswith diet of total amount 17% with three kinds of animal and plant proteinproportion was investigated.Following results are shown:1.Protein of diffe-rent qualities(group A 100% glutenin,group B 10% casein,90% glutenin,group C and group D 40%casein, 60% glutenin)effects on protein metabo-lism of exercise rats.Protein quality of group A was the worst among the fourgroups.In group A negative nitrogen balance was exhibited after taking exer-cise,serum urea increases and muscle nitrogen decreases.It is shown thatthe protein catabolism was incresed.2.Protein of different quality also possessed effects on energy metabolism.Protein quality of group C was better.In group C more muscle glucogen wasexpended during exercise,more ATP was prodticed; activities of LDH andCa2+-ATPase were greater.3.Groups C and D were fed on same qtiality of protein.In group C,ATP,activities of LDH and Ca2+-ATPase were better than those of in group D.4.From both protein and energy metabolism,the ratio of casein to glutenin4:6 was appropriate.