排序方式： 共有92条查询结果，搜索用时 234 毫秒
31.
观察男子古典摔跤运动员4周大强度训练时一些生理生化指标的变化情况,选择评定机能的有效指标。第1周每日评定主观体力感觉等级(RPE)和肌肉酸痛程度,并分别在第1周的第1、3、5天和4个周的第7天相同时间检测血清肌酸激酶(CK)、血尿素及血红蛋白含量的水平。结果提示:大强度训练对古典摔跤运动员刺激足够大,机体出现反应,但一段时间后各指标基本恢复,机体对大强度训练适应。而且主观体力感觉等级、肌肉酸痛程度、CK、血尿素及血红蛋白可以作为反映古典摔跤大强度训练的有效指标。 相似文献
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有氧运动锻炼对LD含量和LDH、ALP、ACP、CK活性影响的研究 总被引：5，自引：0，他引：5
为了探讨有氧运动锻炼对人体在不同功能状态下血 L D(乳酸 )代谢和 L DH(乳酸脱氢酶 )、AL P(碱性磷酸酶 )、ACP(酸性磷酸酶 )、CK(肌酸激酶 )活性的影响 ,将 4 2名中学生随机分为一般锻炼组、强化锻炼组和对照组。对两运动组分别实施不同的有氧运动处方后 ,与对照组相比 ,结果发现 :安静状态时 ,血清中 L D含量明显降低 (P<0 .0 5 ) ,L DH活性极显著升高 (P<0 .0 0 1) ,ACP、CK活性呈升高趋势 ,AL P活性呈下降趋势 ,但均无显著性差异 (P>0 .0 5 ) ;定量负荷和极量负荷运动后 ,L D含量无变化、L DH活性仍显著升高 ,ACP、AL P、CK活性的变化趋势基本与安静状态时相同 ,只是强化锻炼组 AL P活性在极量负荷时显著低于对照组水平。这说明 ,短期有氧运动锻炼能够有效地降低人体在安静状态时血乳酸的生成和促进在不同功能状态下 L DH活性的提高 ,但对 ACP、AL P、CK的作用不够明显 相似文献
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《European Journal of Sport Science》2013,13(2):59-72
Abstract Amino acids contribute between 2–8% of the energy needs during endurance exercise. Endurance exercise training leads to an adaptive reduction in the oxidation of amino acids at the same absolute exercise intensity, however, the capacity to oxidize amino acids goes up due to the increase in the total amount of the rate limiting enzyme, branched chain 2-oxo-acid dehydrogenase. There appears to be a modest increase (range?=?12–95%) in protein requirements only for very well trained athletes who are actively training. Although the majority of athletes will have ample dietary protein to meet any increased need, those on a hypoenergetic diet or during extreme periods of physical stress may need dietary manipulation to accommodate the need. Caffeine is a trimethylxanthine derivative that is common in many foods and beverages. The consumption of caffeine (3–7 mg/kg) prior to endurance exercise improves performance for habitual and non-habitual consumers. The ergogenic effect is likely due to a direct effect on muscle contractility and not via an enhancement of fatty acid oxidation. Creatine is important in intra-cellular energy shuttling and in cellular fluid regulation. Creatine monohydrate supplementation (20 g/d X 3–5 days) increases fat-free mass, improves muscle strength during repetitive high intensity contractions and increases fat-free mass accumulation and strength during a period of weight training. Given the increase in weight, there are likely neutral or even performance reducing effects in sports that are influenced by body mass (i.e., running, hill climbing cycling). 相似文献
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Roger C Harris Anthony L Almada D Beorn Harris Mark Dunnett Peter Hespel 《Journal of sports sciences》2013,31(9):851-857
Three samples of Creatine Serum? ATP Advantage from Muscle Marketing USA, Inc. were assayed for creatine by two different techniques by four independent laboratories, and for creatinine by two different techniques by two laboratories. A further sample was assayed for phosphorylcreatine. Dry weight and total nitrogen were also analysed. Six male volunteers ingested in random order, over 3 weeks: (A) water; (B) 2.5?g creatine monohydrate (Cr?·?H2O) in solution; and (C) 5?ml Creatine Serum? (reportedly containing an equivalent amount of Cr?·?H2O). Blood samples were collected before and up to 8?h after each treatment and plasma was analysed for creatine and creatinine. Eight-hour urine samples were analysed for creatine. Ingestion of 2.5?g creatine monohydrate in solution resulted in a significant increase in plasma creatine (from 59.1±11.8?μmol?·?l?1 to 245.3±74.6?μM μmol?·?l?1; mean±s) and urinary creatine excretion. No increase in plasma or urinary creatine or creatinine was found on ingestion of Creatine Serum? or water. Analysis showed 5?ml of Creatine Serum? to contain <10?mg Cr?·?H2O and approximately 90?mg creatinine. Phosphorylcreatine was not detectable and only a trace amount of phosphorous was present. Total nitrogen analysis ruled out significant amounts of other forms of creatine. We conclude that the trace amounts of creatine in the product would be too little to affect the muscle content even with multiple dosing. 相似文献
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肌酸代谢动力学研究进展 总被引：1，自引：0，他引：1
现已发现肌酸进行跨膜转运需要相应的转运体(包括细胞膜运载体和线粒体运载体)是肌酸在体内分布的关键因素之一;肌酸的转运与转运体的数量及其表达、骨骼肌纤维的类型、Na 和Cl 浓度、激素、运动等多因素相关;肌酸在机体内代谢并分解为肌酸酐并且经肾脏排除体外;肌酸代谢动力学研究涉及到血药最大浓度(Cmax)和达到最大浓度的时间(Tmax)等动力学参数. 相似文献
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Andrew David Govus Erik Petrus Andersson Oliver Michael Shannon Holly Provis Mathilda Karlsson Kerry McGawley 《European Journal of Sport Science》2018,18(10):1299-1308
This study investigated whether commercially available compression garments (COMP) exerting a moderate level of pressure and/or neuromuscular electrical stimulation (NMES) accelerate recovery following a cross-country sprint skiing competition compared with a control group (CON) consisting of active recovery only. Twenty-one senior (12 males, 9 females) and 11 junior (6 males, 5 females) Swedish national team skiers performed an outdoor sprint skiing competition involving four sprints lasting ～3–4 min. Before the competition, skiers were matched by sex and skiing level (senior versus junior) and randomly assigned to COMP (n?=?11), NMES (n?=?11) or CON (n?=?10). Creatine kinase (CK), urea, countermovement jump (CMJ) height, and perceived muscle pain were measured before and 8, 20, 44 and 68?h after competition. Neither COMP nor NMES promoted the recovery of blood biomarkers, CMJ or perceived pain post-competition compared with CON (all P?>?.05). When grouping all 32 participants, urea and perceived muscle pain increased from baseline, peaking at 8?h (standardised mean difference (SMD), [95% confidence intervals (CIs)]): 2.8 [2.3, 3.2]) and 44?h (odds ratio [95% CI]: 3.3 [2.1, 5.1]) post-competition, respectively. Additionally, CMJ was lower than baseline 44 and 68?h post-competition in both males and females (P?相似文献
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摘要：目的：大电导钙激活钾通道（BKCa）对神经元兴奋性以及动作电位发放频率具有重要调控作用。本实验拟观察肌酸补充对皮层神经元葡萄糖剥夺时BKCa电流密度及胞内钙离子浓度的影响。方法：全细胞膜片钳技术记录肌酸干预对不同时长葡萄糖剥夺原代培养大鼠皮层神经元BKCa电流的变化;应用激光共聚焦检测神经元胞内游离钙离子浓度。结果：1）葡萄糖剥夺1～2 h BKCa电流密度显著增加（P < 0.01）,4～5 h显著减小（P < 0.01）。胞内游离Ca2+荧光强度随葡萄糖剥夺1～5 h逐渐增强（P < 0.01）;2）肌酸孵育显著减小原代培养神经元BKCa电流密度以及胞内游离Ca2+荧光强度（P < 0.01）。结论：葡萄糖剥夺1～2 h使胞内游离Ca2+浓度显著升高,激活BKCa大量开放,使神经元超极化,降低神经元兴奋性：Cr可有效抑制葡萄糖剥夺引起BKCa电流增加以及胞内钙离子浓度升高,维持锥体神经元的兴奋性。 相似文献
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采用实验法,按正交表L4(23)进行实验设计,探讨补充糖、肌酸对艺术体操运动员血糖、血乳酸、血尿素氮和血清肌酸激酶活性影响的效果.结果表明,单独补充糖或肌酸、同时补充糖和肌酸均可使运动员赛后血糖、血尿素氮和血清肌酸激酶活性显著下降,而且、糖和肌酸同时补充效果更好,有利于提高艺术体操运动员竞技能力. 相似文献
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足球运动员补充碳水化合物、肌酸后生化指标变化的研究 总被引：1，自引：0，他引：1
足球运动是一项大强度、高对抗的激烈运动 ,在比赛中要求运动员反复冲刺 ,如何提高运动员的磷酸原贮备是提高运动员反复冲刺能力的关键。观察和比较单独补充肌酸或碳水化合物以及二者同时服用对于运动员的冲刺能力、血糖、血清BUN、血清胰岛素浓度的影响 ,结果表明 :1.补充肌酸和肌酸一低聚糖复合液可以明显提高运动员的反复冲刺能力 ;2 .补糖、补肌酸可以使由运动所造成的血尿素上升显著下降 ,但没有二者交互作用 ;3.补糖有利于维持血糖平衡 ,有利于长时间运动能力的保持。 相似文献