摄入L-肌肽对女子足球运动员高强度训练后肌肉损伤恢复和抗氧化能力的影响

目的:探讨L-肌肽补充对女足运动员高强度运动后氧化伤害和肌肉损伤恢复的影响.方法:本研究招募30名女足受试者,在完成身体基本测量和最大摄氧量测验后,依照个人最大摄氧量表现进行配对分组,各组分别进行高剂量L-肌肽(HL组)、低剂量L-肌肽(LL组)、安慰剂(C组)补充.持续补充28 d后,在下坡跑运动前24h检测受试者肌肉损伤生理指标:最大等长收缩肌力、视觉模拟评分和血清肌酸激酶等氧化应激生化指标.次日在跑台上进行以70%最大摄氧量及强度在-15%坡度进行30 min下坡跑,在运动后24,48,72 h分别检测视觉模拟评分、最大等长收缩肌力、肌酸激酶,谷胱甘肽等指标.结果:LL组和HL组最大等长收缩肌力后测结果显著高于P组,p0.05. LL组和HL组视觉模拟评分后测结果显著低于P组,p0.05. LL组、 HL组的尿素氮、肌酸激酶、乳酸脱氢酶、谷丙转氨酶后测结果显著低于P组,p0.05. LL组、 HL组的谷胱甘肽、谷胱甘肽过氧化酶、谷胱甘肽—S转移酶后测结果显著低于P组,p0.05; LL组、 HL组的超氧歧化酶后测结果显著高于P组.结论:摄入L-肌肽可以显著改善高强度运动后的肌力减退、肌肉疼痛,降低血清尿素氮肌酸激酶、乳酸脱氢酶和天冬氨酸转氨酶等肌肉疲劳和肌肉损伤指标;降低谷胱甘肽、谷胱甘肽过氧化酶、谷胱甘肽—S转移酶血清浓度,提升超氧歧化酶浓度,增强机体抗氧化作用.此外研究发现,摄入低剂量L-肌肽与高剂量L-肌肽相比在衡量肌肉疲劳损伤和抗氧化等关键指标上没有统计学意义.

On Effects of Ingestion of BETA-Alanine on Muscle Injury Recovery and Antioxidant Capacity of Female Football Players after High-Intensity Training

Studies have been done to investigate the effects of BETA-alanine supplementation on oxidative damage and recovery of muscle injury in high-intensity sports of female athletes. Thirty female subjects have been enrolled in the study. After completing the basic body measurement and the maximum oxygen uptake (VO_2max) test, they were paired according to individual VO_2max performance. Each group was given high dose beta-alanine, low dose. Beta-alanine, and placebo supplements. After 28 days of continuous supplementation, the physiological indicators of muscle damage in the subjects were measured 24 h before the downhill running exercise:maximum isometric muscle strength, MS evaluation and muscle damage, blood biochemical indicators, serum creatine kinase, oxidative stress, blood biochemical indicators, the next day in the treadmill 70% of VO_2max intensity was performed on the slope of -15% for 30 minutes, and the indicators of MS, MVIC, CK, GSH were detected at 24h, 48h and 72h after exercise. The post-test results of MVIC in group LB and HB were significantly higher than those in group P, p<0.05. 3) The post-MS results of LB group and HB group were significantly lower than those of group P, p<0.05. The results of BUN, CK, LDH and AST in LB group and HB group were significantly lower than those in group P, p<0.05. The results of GSH, GSH-PX and GSH-ST in LB group and HB group were significantly lower than those in group P, p<0.05. The results of SOD in LB group and HB group were significantly higher than those in group P. Conclusion:Ingestion of beta-alanine can significantly improve muscle strength and muscle pain after high-intensity exercise, and reduce muscle fatigue and muscle damage such as serum urea-nitrocreatine kinase, lactate dehydrogenase and aspartate aminotransferase; Reduce the serum concentration of GSH, GSH-PX, GSH-ST, increase the SOD concentration, and enhance the body''s antioxidant effect. In addition, studies have found that low-dose beta-alanine is not significantly different from high-dose beta-alanine in measuring key indicators of muscle fatigue injury and antioxidants.