共查询到18条相似文献，搜索用时 140 毫秒
1.
为了研究补充磷脂对大鼠腓肠肌钝挫伤恢复效果,采用重物下落装置建立急性骨骼肌钝挫伤模型,损伤后补充磷脂。在损伤后取样测定和计算腓肠肌SOD、CAT、GSH-Px活性及MDA含量变化。与自然愈合组比较结果发现,损伤后第2-10d,补充磷脂能显著提高腓肠肌SOD、GSH-Px活性,显著降低MDA含量,对CAT活性影响未出现显著变化。因此,补充磷脂能明显提高大鼠急性骨骼肌钝挫伤后的腓肠肌中SOD、GSH-Px活性,降低腓肠肌中MDA含量,对于清除大鼠受损腓肠肌氧自由基,加快消除损伤后发生的脂质过氧化反应,降低脂质过氧化水平,提高急性骨骼肌钝挫伤恢复效果具有促进作用。 相似文献
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骨骼肌钝挫伤是影响运动员运动能力及运动寿命的一种常见疾病.在骨骼肌损伤修复过程中,碱性成纤维细胞生长因子(bFGF)骨骼肌肌原细胞有增殖作用,可以加快损伤肌肉修复.通过免疫化学偶联技术,制备重组bFGF包裹的磁性纳米粒,采用重物下落装置建立急性骨骼肌钝挫伤模型,在外加磁场的牵引下靶向聚焦至损伤部位.在损伤后第2、10、17、24和30天分别取样,测定和计算肌肉收缩力和应力松弛,并利用实时荧光定量PCR法测定大鼠腓肠肌MHC-Ⅱb mRNA的表达.结果发现,检测大鼠腓肠肌在受到钝挫伤后的第17天及第24天收缩力,磁纳米化bFGF组较bFGF组有显著性提高:在损伤后第2天,磁纳米化的bFGF即能使应力松弛恢复接近正常肌肉水平;与注射bFGF组相比,bFGF包裹磁性纳米粒对损伤肌肉收缩力的提高更明显.损伤后第2-10天,磁纳米化bFGF组与其余各组之间的MHC-Ⅱb mRNA表达差异有统计学意义.因此,磁纳米化的bFGF能明显改善大鼠急性骨骼肌钝挫伤后的收缩应力和恢复应力衰减,增强损伤肌肉 MHC-Ⅱb mRNA的表达,更好地促进损伤肌肉修复. 相似文献
3.
李骁君 《天津体育学院学报》2011,26(1):34-36
利用纳米磁性颗粒将bFGF定位于大鼠骨骼肌钝挫伤部位,考察该方法对大鼠急性骨骼肌钝挫伤恢复过程中收缩应力及MHC-Ⅱb表达影响。研究结果表明,bFGF对大鼠腓肠肌钝挫伤后第17、24天的收缩力有明显提高。损伤后第2～10天,bFGF包裹组与其余各组之间的MHC-ⅡbmRNA表达差异显著(P<0.05)。因此,磁纳米化的bFGF能明显改善大鼠急性骨骼肌钝挫伤后的收缩应力衰减,显著促进损伤肌肉MHC-ⅡbmRNA的表达,改善损伤肌肉再生和结构修复。 相似文献
4.
目的:观察针刺对急性骨骼肌钝挫伤大鼠卫星细胞增殖的影响。方法:将采用打击装置造成后下肢腓肠肌钝挫伤的大鼠随机分为即刻组、针刺治疗组、自然愈合组。针刺治疗组采用阿是穴针刺疗法,自然愈合组不治疗。结果:针刺治疗组肌卫星细胞核数在大鼠伤后第2天时达高峰,而自然愈合组在伤后第4天达高峰,之后呈下降趋势。在损伤后第1天、第2天、第4天,针刺治疗组大鼠肌卫星细胞核数目均比自然愈合组多,且在损伤后第2天显著高于自然愈合组。结论:大鼠骨骼肌损伤后,针刺能促进肌卫星细胞的增殖并促使活跃期提前出现,促进肌肉再生,加速损伤愈合的进程。 相似文献
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目的：围绕氧化应激中自由基的产生和清除来探讨微压氧对于大强度训练后的恢复机制,为微压氧在运动训练后恢复中的应用提供理论依据和实验支持。方法：8周龄雄性SD大鼠40只,经一周的适应性训练后筛选出30只,随机分为对照组（C组）、大强度训练后自然恢复组（HQ组,26.8 m/min,10°坡度）和微压氧恢复组（HM组）,每组10只。本实验采用的微压氧仓氧浓度为26%左右,压强为3.6 PSI。训练周期为8周,每周训练5 d,每天1 h。HM组每次训练结束后即刻放入微压氧仓恢复1 h。在第8周最后一次训练结束24 h后进行麻醉,切取左侧腓肠肌用于氧化应激指标的检测和观察腓肠肌组织形态。结果：（1）与HQ组大鼠相比,HM组大鼠跑至力竭时间显著性长于HQ组（P＜0.05）。（2）HQ组肌肉MDA含量高于C组和HM组,具有显著性差异;HM组肌肉超氧化物歧化酶（SOD）活性显著性高于C组;HM组肌肉GSH-PX的活性高于C组和HQ组。（3）与C组相比,HQ组大鼠和HM组大鼠骨骼肌损伤轻微,但是HM组轻于HQ组。结论：大强度训练可造成大鼠骨骼肌氧化应激损伤,使其运动能力下降;而微压氧可提高骨骼肌抗氧化酶活性,减少骨骼肌脂质过氧化反应,提高运动能力。 相似文献
6.
研究的主要目的是观察预热应激是否对大鼠骨骼肌离心运动损伤具有保护作用，并对预热应激的保护作用机制进行探讨。实验大鼠分为预热应激组和正常组。预热应激组大鼠恢复24h后，两组进行大强度离心运动，然后分别比较腓肠肌最大强直收缩力、血清肌酸激酶（CK）、乳酸脱氢酶（LDH）、丙二醛（MDA）的变化。结果发现，预热应激组大鼠离心运动后最大强直收缩力比正常组下降少且恢复快，CK在运动后即刻显著低于正常组，MDA显著低于正常组。 相似文献
7.
极低频电磁场能加快组织愈合、促进细胞分化等,但是对骨骼肌钝挫伤后恢复过程中的作用研究甚少.用极低频电磁场对骨骼肌钝挫伤大鼠模型进行处理,并通过组织学观察及生理、生化相关指标检测来分析判断ELFMF对骨骼肌损伤恢复的影响.结果发现,与假暴露组相比,磁场暴露组肌细胞排列更整齐,炎性细胞浸润少,细胞水肿程度轻,核内移现象少;磁场暴露组、注射bFGF组肌纤维排列紊乱程度、Z线飘移程度均较轻;极低频电磁场处理,能显著降低钝挫伤后血清CK、LDH及ALP水平.因此,极低频电磁场通过改变钝挫伤后腓肠肌肌细胞核增生,加快线粒体自身修复速度,减少肌细胞膜的通透性,加速受损肌细胞有氧代谢能力的恢复.极低频电磁场通过影响肌细胞核及线粒体的增生,缓解受损骨骼肌的能量危机,从而加速受损肌组织恢复速度. 相似文献
8.
骨骼肌伤后训练对其收缩力与松弛特性的影响 总被引：4，自引：1，他引：3
82只雄性SD大鼠为实验对象，对其小腿三头肌急性拉伤。随机分为自然修复组（实验对照EC）、牵张训练组（PT）、静力训练组（ST）和跑动训练组（MT）、分别于恢复期不同的时间测试腓肠肌的等长收缩力和应力松弛特性。结果发现：在体肌肉中，轻度拉伤早期收缩力的较大幅度的变化，炎性反应是其主要的影响因素，拉伤早期的收缩力恢复与其结构性修复存在着时程上的差异，这种时程方面的差异是肌肉重复损伤的重要原因，肌肉拉伤早期进行牵张训练，对肌肉的功能恢复产生负面影响，拉伤后期的牵张训练，对肌肉的功能性恢复与提高产生重要作用，大强度的跑动训练并没表现出训练效应累积。肌肉伤后静力训练对收缩力及松弛特性的恢复有着积极影响，大运动量的静力训练导致伤肌的功能性消退。 相似文献
9.
骨骼肌损伤后修复过程中机械生长因子作用研究 总被引：3，自引：0，他引：3
目的:通过观察小鼠骨骼肌损伤后修复过程中机械生长因子(MGF)、M-cad基因表达,探讨MGF在伤后修复过程中所起作用;方法:健康雄性C57BL,/6小鼠49只,按体重随机分为7组.其中1组不做任何处理作为对照组(C组),另6组均于同一天损伤,即损伤组(injury,I组).小鼠腓肠肌钝挫伤后不同时期处死取材,对MGF、M-cad基因表达水平做实时定量RT-PCR分析;结果:骨骼肌损伤后1天MGF表达水平即显著升高(P<0.01),第4、第7天持续升高,第7天达峰值,第11天仍显著高于对照组.非损伤腿中MGF表达无显著变化.M-cad在非损伤腿中的表达与损伤腿相似,均在第7天表达达峰值(P<0.01);结论:MGF可能是激活肌卫星细胞的因子之一,但非惟一因子.MGF也可能与多肽合成有关. 相似文献
10.
采用跑台下坡跑模型,研究了不同剂量的低强度氦氖激光对大鼠力竭运动后骨骼肌自由基、一氧化氮(NO)代谢的影响.72只SD大鼠随机分成安静对照组,运动对照组,运动加低、中、高荆量激光处理组.各运动组的大鼠均进行一次性跑台力竭运动,运动加激光组的大鼠在运动后于腓肠肌处接受氦氖激光照射,每日1次,各剂量组照射参数分别为12、28和43 J/cm2(20、46和71 mW/cm2,10 min).运动后24和48 h进行腓肠肌取材,检测指标为肌肉超氧化物歧化酶(SOD)、丙二醛(MDA)、一氧化氮合酶(NOS)以及一氧化氮(NO).结果发现,力竭运动后,运动对照组的MDA水平和NOS活性显著升高,而SOD活性和NO变化不明显.43 J/cm2的激光照射能显著提高力竭运动后的SOD活性、降低MDA水平以及显著提高NOS活性和NO水平,而12和28 J/cm2的激光照射则作用不明显.由此表明,低强度氦氖激光能够提高大鼠力竭运动后骨骼肌抗氧化能力、降低自由基水平,并能促进骨骼肌NO的合成,提高NO水平,其作用是剂量和强度依赖性的. 相似文献
11.
低功率激光对急性骨骼肌顿挫伤大鼠肌卫星细胞增殖活性的影响 总被引：2，自引：1，他引：1
目的：观察低功率激光照射对急性骨骼肌顿挫伤大鼠肌卫星细胞增殖活性的影响。方法：将采用打击装置造成后下肢肌群顿挫伤的60只大鼠随机分为激光治疗组（30只）和自然愈合组（30只）。激光治疗组采用美国Erchonia EML（ML2）型低功率激光器对损伤局部进行照射，自然愈合组不进行治疗。通过HE染色光镜、透射电镜观察方法分析低功率激光照射对大鼠急性骨骼肌顿挫伤组织学愈合进程的影响；并通过免疫组织化学方法检测增殖细胞核抗原（proliferating cell nuclear antigen，PCNA）分析低功率激光照射对肌卫星细胞增殖活性的影响。结果：低功率激光照射能加速骨骼肌的再生，促进损伤修复；低功率激光照射对急性骨骼肌顿挫伤大鼠肌卫星细胞有较强的促增殖作用。结论：低功率激光能增强急性骨骼肌顿挫伤大鼠肌卫星细胞增殖活性，从而加速骨骼肌的再生，促进损伤修复。 相似文献
12.
13.
血清肌酸激酶与骨骼肌损伤关系的探讨 总被引：17，自引：0，他引：17
研究目的在于对血清肌酸激酶与骨骼肌损伤之间的关系进行探讨。采用跑台一次性离心运动至力竭的动物模型,48只7周龄雌性大鼠随机分为安静对照组和运动后即刻、1、2、4和7天组,测定血清肌酸激酶活性,同时通过HE染色分析骨骼肌形态学损伤变化。结果显示血清肌酸激酶活性峰值出现在运动后即刻,运动后1天迅速下降。HE染色结果则表明离心运动后骨骼肌损伤呈现延迟性时相特点,在运动后第2天骨骼肌损伤范围达到最大。本实验表明血清肌酸激酶与骨骼肌损伤的变化趋势并不一致,血清肌酸激酶水平不能反映骨骼肌损伤。 相似文献
14.
In this study, we assessed the effect of exercise-induced muscle damage on knee extensor muscle strength during isometric, concentric and eccentric actions at 1.57 rad · s -1 and vertical jump performance under conditions of squat jump, countermovement jump and drop jump. The eight participants (5 males, 3 females) were aged 29.5 - 7.1 years (mean - s ). These variables, together with plasma creatine kinase (CK), were measured before, 1 h after and 1, 2, 3, 4 and 7 days after a bout of muscle damaging exercise: 100 barbell squats (10 sets 2 10 repetitions at 70% body mass load). Strength was reduced for 4 days ( P ? 0.05) but no significant differences ( P > 0.05) were apparent in the magnitude or rate of recovery of strength between isometric, concentric and eccentric muscle actions. The overall decline in vertical jump performance was dependent on jump method: squat jump performance was affected to a greater extent than countermovement (91.6 - 1.1% vs 95.2 - 1.3% of pre-exercise values, P ? 0.05) and drop jump (95.2 - 1.4%, P ? 0.05) performance. Creatine kinase was elevated ( P ? 0.05) above baseline 1 h after exercise, peaked on day 1 and remained significantly elevated on days 2 and 3. Strength loss after exercise-induced muscle damage was independent of the muscle action being performed. However, the impairment of muscle function was attenuated when the stretch-shortening cycle was used in vertical jumping performance. 相似文献
15.
The effect of exercise-induced muscle damage on isometric and dynamic knee extensor strength and vertical jump performance 总被引：3，自引：0，他引：3
In this study, we assessed the effect of exercise-induced muscle damage on knee extensor muscle strength during isometric, concentric and eccentric actions at 1.57 rad x s(-1) and vertical jump performance under conditions of squat jump, countermovement jump and drop jump. The eight participants (5 males, 3 females) were aged 29.5+/-7.1 years (mean +/- s). These variables, together with plasma creatine kinase (CK), were measured before, 1 h after and 1, 2, 3, 4 and 7 days after a bout of muscle damaging exercise: 100 barbell squats (10 sets x 10 repetitions at 70% body mass load). Strength was reduced for 4 days (P< 0.05) but no significant differences (P> 0.05) were apparent in the magnitude or rate of recovery of strength between isometric, concentric and eccentric muscle actions. The overall decline in vertical jump performance was dependent on jump method: squat jump performance was affected to a greater extent than countermovement (91.6+/-1.1% vs 95.2+/-1.3% of pre-exercise values, P< 0.05) and drop jump (95.2+/-1.4%, P< 0.05) performance. Creatine kinase was elevated (P < 0.05) above baseline 1 h after exercise, peaked on day 1 and remained significantly elevated on days 2 and 3. Strength loss after exercise-induced muscle damage was independent of the muscle action being performed. However, the impairment of muscle function was attenuated when the stretch-shortening cycle was used in vertical jumping performance. 相似文献
16.
Stephan Sorichter Johannes Mair Arnold Koller Erich Muller Christian Kremser Werner Judmaier 《Journal of sports sciences》2013,31(9):687-691
The aim of this study was to examine the relationship between myosin heavy chain (MHC) release as a specific marker of slow-twitch muscle fibre breakdown and magnetic resonance imaging (MRI) of skeletal muscle injury after eccentric exercise. The effects of a single series of 70 high-intensity eccentric contractions of the quadriceps femoris muscle group (single leg) on plasma concentrations of creatine kinase and MHC fragments were assessed in 10 young male sport education trainees before and 1 and 4 days after exercise. To visualize muscle injury, MRI of the loaded thigh was performed before and 4 days after the eccentric exercise. All participants recorded an increase ( P ? 0.05) in creatine kinase after exercise. In five participants, T2 signal intensity was unchanged post-exercise compared with pre-exercise and MHC plasma concentration was normal; however, they showed an increase ( P ? 0.05) in creatine kinase after exercise. For the remaining five participants, there was an increase in T2 signal intensity of the loaded vastus intermedius and vastus lateralis. These changes in MRI were accompanied by an increase in MHC plasma concentration ( P ? 0.01) as well as an increase in creatine kinase ( P ? 0.01). We suggest that changes in MRI T2 signal intensity after muscle damage induced by eccentric exercise are closely related to damage to structurally bound contractile filaments of some muscle fibres. Additionally, MHC plasma release indicates that this damage affects not only fast-twitch fibres but also some slow-twitch fibres. 相似文献
17.
Sorichter S Mair J Koller A Müller E Kremser C Judmaier W Haid C Calzolari C Puschendorf B 《Journal of sports sciences》2001,19(9):687-691
The aim of this study was to examine the relationship between myosin heavy chain (MHC) release as a specific marker of slow-twitch muscle fibre breakdown and magnetic resonance imaging (MRI) of skeletal muscle injury after eccentric exercise. The effects of a single series of 70 high-intensity eccentric contractions of the quadriceps femoris muscle group (single leg) on plasma concentrations of creatine kinase and MHC fragments were assessed in 10 young male sport education trainees before and 1 and 4 days after exercise. To visualize muscle injury, MRI of the loaded thigh was performed before and 4 days after the eccentric exercise. All participants recorded an increase (P < 0.05) in creatine kinase after exercise. In five participants, T2 signal intensity was unchanged post-exercise compared with pre-exercise and MHC plasma concentration was normal; however, they showed an increase (P < 0.05) in creatine kinase after exercise. For the remaining five participants, there was an increase in T2 signal intensity of the loaded vastus intermedius and vastus lateralis. These changes in MRI were accompanied by an increase in MHC plasma concentration (P< 0.01) as well as an increase in creatine kinase (P < 0.01). We suggest that changes in MRI T, signal intensity after muscle damage induced by eccentric exercise are closely related to damage to structurally bound contractile filaments of some muscle fibres. Additionally, MHC plasma release indicates that this damage affects not only fast-twitch fibres but also some slow-twitch fibres. 相似文献
18.
骨骼肌钝挫伤及是时性损伤是常见的运动损伤,恢复过程不当或恢复不完全、反复受伤会严重影响骨骼肌的生理功能。造成人体运动能力的下降,甚至影响运动员的运动寿命。因此研究极低频磁场对运动损伤恢复过程中的影响具有一定的实际意义,有可能为运动恢复方法的创新开辟新的道路,对极低频磁场的对人体的生物学效应提供参考和依据。 相似文献