补充大豆多肽对中长跑运动员训练期生化指标的影响

目的 :观察大豆多肽固体饮料对耐力项目运动员促进恢复的作用。方法 :2 1名男性省级中长跑运动员随机分为对照组 (n =7)、补糖组 (n =6 )和补肽组 (n =8)进行为期 4周的大强度训练 ,补肽组每天训练课后补充含有 8g大豆多肽和 35g糖的运动饮料 ,补糖组服用含有 35g糖的饮料 ,对照组服用外观及口感与大豆多肽饮料相近的安慰剂。实验前、训练两周后及实验后对受试对象的体成分、RPE等级和血液生化指标进行测试。结果 :补肽组运动后的体重、瘦体重比实验前明显提高 (P <0 0 5 ) ,血清睾酮水平比对照组显著提高 (P <0 0 5 ) ,而补肽组RPE等级显著下降 (P <0 0 1) ,同时血清肌酸激酶亦下降 (P <0 0 5 )。结论 :服用大豆多肽可促进中长跑运动员瘦体重的增加、提高血清睾酮的水平以及降低训练后RPE的等级 ,提示大豆多肽可促进蛋白质的合成 ,并具有一定的抗疲劳作用。此外摄入大豆多肽可降低中长跑运动员运动后血清肌酸激酶的水平 ,提示大豆多肽有促进骨骼肌损伤组织的修复以及减少细胞内肌酸激酶外渗的作用

The Effects of Soybean Peptides Supplementation on Serum Biomarkers in Distance Runners

Objective: We performed a randomized double-blind study in distance runners to investigate the possible biological effects of daily consumption of soybean peptides. Methods: Twenty-one trained male distance runners, randomly divided into three groups: control group (C,n=7), carbohydrate supplementation group (CS, n=6) and soybean peptides supplementation group (SP,n=8), took part in the study.Their hormonal and serum metabolic profile was examined in a 4-week program of strenuous training. Daily training (4～6 hours per day, endurance and strength), food and medication were similar for all athletes. Group SP received a soy sports beverage supplement containing 8g soybean peptides and 35g carbohydrate once a day. Group CS received a sport drink containing 35g carbohydrate. Group C supplemented a placebo identical in appearance and flavor. Body weight, lean body mass, RPE, serum total testosterone, blood urea, hemogram, lactate dehydrogenase, creatine kinase and immunoglobulins were measured before, during and after the 4-week training program. Results: Data demonstrated that Group SP had an increase in body weight, especially in lean body mass and cyclic total testosterone level (P<0.05); and a decrease level in serum creatine kinase (P<0.05) and RPE (P<0.01).Conclusions: Our preliminary conclusions suggest that soybean peptides supplementation may help repair the injured skeletal muscles and prevent exercise-induced protein degradation; it may also protect the integrity of cellular membranes to avoid intracellular creatine kinase leaking and eliminate exercised-induced fatigue.