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1日龄AA肉鸡160只,随机分成4组。1~4组饮水中肌肽添加剂量分别为0(对照组)、20(低剂量组)、40(中剂量组)、60(高剂量组)mg/L,试验期6周。于2、4、6周末每组随机取6只肉鸡心脏采血,测定血清中的谷丙转氨酶(ALT)、谷草转氨酶(AST)活力和总胆固醇(TC)的含量。结果表明:肌肽各剂量组ALT活力在2、4、6周龄时均低于对照组,但组间差异均不显著(P>0.05)。4周龄时各剂量组AST的活力均高于对照组,2、6周龄均低于对照组(P<0.05或P<0.01)。生长中期肌肽组血清胆固醇含量有所上升,生长后期略微下降,肌肽对肝脏功能没有明显的影响。 相似文献
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Analysis of ATPase characterized type I and type II fibres from biopsy samples of the vastus lateralis muscle of four male subjects showed a selective distribution of carnosine and free taurine similar to that observed in other species. The mean carnosine concentration was twice as high in type II compared with type I muscle fibres (23.2 +/- 17.8 and 10.5 +/- 7.6 mmol . kg -1 dry weight, respectively), while taurine was four times higher in type I compared with type II muscle fibres (39.2 +/- 17.8 and 9.6 +/- 2.6 mmol . kg -1 dw, respectively). Overlap in the concentration of carnosine or taurine between fibre types occurred only once in one subject. There was no overlap between fibre types in the ratio of carnosine to taurine. Higher carnosine concentrations in type II fibres will result in a greater contribution to the buffering of H+ arising from anaerobic metabolism. The contribution in a type II fibre with the highest carnosine content was estimated to equal 28% of that from other sources. 相似文献
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查阅近年来大量国内外相关文献,对肌肽的理化性质、分布与代谢、生物学功能等方面进行综述。探讨肌肽保护细胞的途径和机制以及对运动机体的作用,旨在对肌肽这种天然高效、无毒易吸收的抗氧化剂在运动实践中的应用做展望。 相似文献
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探讨了不同剂量心肌肤对小鼠运动能力的影响.分别以0.12mg/gBW.d(低剂量)、0.23mg/gBW.d(中剂量)、0.69mg/gBW.d(高剂量)的心肌肤给予小鼠连续灌胃20d,对照组灌蒸馏水0.2(ml/d).20天后测定小鼠力竭游泳时间、血红蛋白(Hb)、血乳酸(BLA)、血尿素(BUN)含量.结果显示:中剂量组、高剂量组均能延长小鼠的负重游泳时间,降低血乳酸、血尿素的含量,提高体内血红蛋白的储备量.提示:心肌肤具有抗疲劳和提高机体运动能力的功效,其效果具有剂量反应关系. 相似文献
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Zhou-yan Feng Xiao-jing Zheng Jing Wang 《Journal of Zhejiang University. Science. B》2009,10(7):505-511
Objective: To directly examine the effects of carnosine on neuronal excitation and inhibition in rat hippocampus in vivo. Methods: Artificial cerebrospinal fluid with carnosine was directly administrated over the exposed rat hippocampus. The changes of neuron activity in the CA1 region of hippocampus were evaluated by orthodromically- and antidromically-evoked potentials, as well as paired-pulse stimulation paradigm. Results: In both orthodromic and antidromic response potentials, carnosine transformed population spikes (PSs) with single spike into epileptiform multiple spikes. In addition, similar to the effect of γ-aminobutyric acidA (GABAA) antagonist picrotoxin, carnosine decreased paired-pulse stimulating depression significantly.However, no significant change was observed in the spontaneous field potentials during the application of carnosine. Conclusion:The results indicate a disinhibition-induced excitation effect of carnosine on the CA1 pyramidal neurons. It provides important information against the application of carnosine as a potential anticonvulsant in clinical treatment. 相似文献
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The varying results reported in response to β-alanine supplementation may be related to the duration and nature of the exercise protocol employed. We investigated the effects of β-alanine supplementation on a wide range of cycling performance tests in order to produce a clear concise set of criteria for its efficacy. Fourteen trained cyclists (Age?=?24.8?±?6.7?years; VO2max?=?65.4?±?10.2 mL·kg·min?1) participated in this placebo-controlled, double-blind study. Prior to supplementation, subjects completed two (familiarization and baseline) supramaximal cycling bouts until exhaustion (120% pre-supplementation VO2max) and two 1-, 4- and 10-km cycling time trial (TT). Subjects then supplemented orally for 4 weeks with 6.4?g/d placebo or β-alanine and repeated the battery of performance tests. Blood lactate was measured pre-exercise, post-exercise and 5 min post-exercise. β-alanine supplementation elicited significant increases in time to exhaustion (TTE) (17.6?±?11.5 s; p?=?0.013, effect compared with placebo) and was likely to be beneficial to 4-km TT performance time (?7.8?±?8.1 s; 94% likelihood), despite not being statistically different (p?=?0.060). Performance times in the 1- and 10-km TT were not affected by treatment. For the highly trained cyclists in the current study, β-alanine supplementation significantly extended supramaximal cycling TTE and may have provided a worthwhile improvement to 4-km TT performance. However, 1- and 10-km cycling TT performance appears to be unaffected by β-alanine supplementation. 相似文献
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