Effects of blood flow restriction without additional exercise on strength reductions and muscular atrophy following immobilization:A systematic review     

Mikhail Santos Cerqueira  Jose Diego Sales Do Nascimento  Daniel Germano Maciel  Jean Artur Mendonca Barboza  Wouber Herickson De Brito Vieira 《运动与健康科学(英文)》2020,9(2):152-159

Purpose:To investigate whether blood flow restriction(BFR) without concomitant exercise mitigated strength reduction and atrophy of thigh muscles in subjects under immobilization for lower limbs.Methods:The following databases were searched:PubMed,CINAHL,PEDro,Web of Science,Central,and Scopus.Results:The search identified 3 eligible studies,and the total sample in the identified studies consisted of 38 participants.Isokinetic and isometric torque of the knee flexors and extensors was examined in 2 studies.Cross-sectional area of thigh muscles was evaluated in 1 study,and thigh girth was measured in 2 studies.The BFR protocol was 5 sets of 5 min of occlusion and 3 min of free flow,twice daily for approximately 2 weeks.As a whole,the included studies indicate that BFR without exercise is able to minimize strength reduction and muscular atrophy after immobilization.It is crucial to emphasize,however,that the included studies showed a high risk of bias,especially regarding allocation concealment,blinding of outcome assessment,intention-to-treat analyses,and group similarity at baseline.Conclusion:Although potentially useful,the high risk of bias presented by original stodies limits the indication of BFR without concomitant exercise as an effective countermeasure against strength reduction and atrophy mediated by immobilization.  相似文献   

循环抗阻训练对女大学生肌力及有氧耐力影响研究*     

窦海波  成波锦  何〓辉 《广州体育学院学报》2020,(2):87-91

目的：探讨循环抗阻训练对非体育专业女大学生等动肌力以及有氧工作能力的影响。方法：以在校非体育专项23名女大学生为研究对象，随机分为实验组和对照组，实验组进行8周循环抗阻训练，对照组不训练。训练前后，利用IsoMed2000等动肌力测试系统测试肩关节、腰腹、膝关节等部位等速肌力；利用CORTEX MetaMax-3B运动心肺功能测试仪测试最大摄氧量的变化。结果：1.通过8周循环抗阻训练，女大学生左右膝关节屈伸肌群等动肌力均显著高于训练前，腰腹伸肌群等动肌力极显著高于训练前，左右肩关节屈肌群等动肌力极显著高于训练前，右肩关节伸肌群等动肌力极显著高于训练前；2.通过8周循环抗阻训练，女大学生最大摄氧量绝对值、相对值以及最大摄氧量出现时间均极显著高于训练前。结论：通过8周循环抗阻训练，能提升女大学生有氧耐力，增加女大学生膝关节屈伸肌群、躯干伸肌群、左右肩关节屈肌群峰以及右肩关节伸肌群的力量。但躯干屈肌群和左肩关节伸肌群作用不明显，今后应用该套循环抗阻训练方案，应增加躯干伸肌群和左肩关节伸肌群锻炼动作。  相似文献   

Multifractal analysis of surface EMG signals for assessing muscle fatigue during static contractions   总被引：1，自引：0，他引：1  

WANG Gang REN Xiao-mei LI Lei WANG Zhi-zhong 《浙江大学学报(A卷英文版)》2007,8(6):910-915

This study is aimed at assessing muscle fatigue during a static contraction using multifractal analysis and found that the surface electromyographic （SEMG） signals characterized multiffactality during a static contraction. By applying the method of direct determination ofthef（a） singularity spectrum, the area of the multifractal spectrum of the SEMG signals was computed. The results showed that the spectrum area significantly increased during muscle fatigue. Therefore the area could be used as an assessor of muscle fatigue. Compared with the median frequency （MDF）--the most popular indicator of muscle fatigue, the spectrum area presented here showed higher sensitivity during a static contraction. So the singularity spectrum area is considered to be a more effective indicator than the MDF for estimating muscle fatigue.  相似文献   

y-氨基丁酸和维生素E对AA肉鸡胸肌生长的影响     

王岩  印显亮  程远  陈烈然  许雪萍 《安徽科技学院学报》2011,25(5):5-9

目的：研究y-氨基丁酸（GABA）对肉鸡胸肌生长的影响,并进一步探讨y-氨基丁酸（GABA）和维生素E（VE）联合应用时是否具有协同作用。方法：试验将300只鸡随机分为6个试验组,每组50羽。其中试验I组为对照组,试验Ⅱ、Ⅲ、Ⅳ组日粮中分别添加25mg／kg、50mg／kg、75mg／kg的GABA,试验V、Ⅵ组日粮中分别添加50rag／kgGABA＋50mg／kgVE和50mg／kgGABA＋100mg／kgVE。在21日龄和42日龄分剐采样,显微镜下测算肌纤维直径。结论：在日粮中添加GABA对肉仔鸡体重和胸肌生长有一定的影响,且具有一定的剂量依赖性,其中以中剂量（50mg／kg）的GABA应用效果最佳。日粮中添加25mg／kg的GABA可以显著提高21日龄肉鸡胸肌肌纤维直径,促进早期肌肉生长,而一定剂量GABA（50rag／kg）与VE（50-100mg／kg）联合应用可显著降低42日龄胸肌肌纤维直径,进而改善肉品质。  相似文献   

传统武术劲的生理机制研究     

周向前 《搏击·武术科学》2012,(4):35-38

目的：探索传统武术劲的系统训练方法及科学原理;方法：在对传统武术站桩练劲进行科学创新再指导6名运动员训练;结果：接受站桩训练的学员训练100小时后全身主要肌肉均建立一种反射,此反射能在特定的姿势下被激活,并且此反射被激活后使肌肉贮存弹性势能而增加出拳、出腿的速度和力量;结论：传统武术劲是符合现代生理学的一门科学的运动技术,它的原理就是人体在紧张性牵张反射的基础上通过训练建立的一个高级的运动条件反射。  相似文献   

Exercise‐induced muscle cramp: A prospective biochemical study in marathon runners     

R.J. Maughan 《Journal of sports sciences》2013,31(1):31-34

Exercise‐induced muscle cramp has been considered to result from disturbances of fluid and electrolyte balance resulting from excessive sweat loss. Serum biochemical and haematological measurements were made on 82 male marathon runners before and after a 42.2‐km race. Fifteen (18%) of the runners reported an attack of muscle cramp which occurred after 35 ± 6 km (mean±s.d.) had been covered. These subjects were not different from the others in terms of racing performance or training status. Serum electrolyte concentrations, including sodium and potassium, were not different between those suffering from cramp and those not so affected either before or after the race, although a significant (P< 0.001) increase in serum sodium concentration occurred in both groups. Serum bicarbonate concentrations fell to the same extent (from 28 to 24 mmol 1^‐1) in both groups. Significant decreases in plasma volume, calculated from the changes in circulating haemoglobin and haemotocrit, occurred in both groups of subjects, but there was no difference in the extent of the haemoconcentration. The results suggest that exercise‐induced muscle cramp may not be associated with gross disturbances of fluid and electrolyte balance.  相似文献   

谷氨酰胺在运动免疫中的作用   总被引：1，自引：1，他引：0  

常波  衣雪洁  张玉玲 《山东体育学院学报》1997,(4)

谷氨酰胺免疫系统一些细胞以较高速率利用，对于这些细胞的生存及正常功能的发挥十分必要。在长时间运动后及过度训练时，血浆中谷氨酰胺浓度减少，提示持续的身体练习能影响肌肉组织对谷氨酰胺的释放，以致不能满足免疫系统对谷氨酰胺的需要，因此，血浆谷氨酰胺水平的下降造成免疫功能受损  相似文献   

植物提取物补充对延迟性肌肉酸痛干预效果     

苏浩  袁梦  李翘楚 《体育科学研究》2022,(1)

通过查阅相关文献,以“延迟性肌肉酸痛”“植物提取物”“DOMS”和“plant extracts”等中英文检索词,分别在中国知网、万方数据库、Webofscience数据库、PubMed数据库和EBSCO系列数据库中,对自1983年6月至2020年5月的相关文献进行检索,最终选取81篇文献进行综述,以探讨植物提取物补充对延迟性肌肉酸痛干预效果,并阐述相关研究进展。结果表明:植物提取物干预与物理、药物和单一营养素干预相比,能从DOMS的炎症反应和氧化应激过程入手来预防延迟性肌肉酸痛的相关症状。但在当前研究中,有关植物提取物的补充效果仍缺乏一些大样本和大规模的实验证明,未来人们的研究方向应着眼于探究更多种类的植物提取物对延迟性肌肉酸痛的干预效果,以及确定在实际应用中具体的最优补剂方案。  相似文献   

运动中补充肌酸的研究进展   总被引：6，自引：0，他引：6  

刘大川 《首都体育学院学报》2002,14(3):94-96

本文首在对运动中补充肌酸的部分研究情况进行综述。  相似文献   

速度攀岩运动员肌肉疲劳的表面肌电信号分析方法     

金锦萍 《四川体育科学》2006,(4):25-27,38

实验表明,速度攀岩运动是非周期性运动,攀岩运动员在速度攀岩的每趟或同一趟的不同时段,他的表面肌电信号都有较大的变化,是显著的非稳定信号。所以,运用表面肌电信号分析速度攀岩运动员的肌肉疲劳问题存在着一定的困难:不能用传统的频阈分析方法去评价相关肌肉的疲劳问题,而只有运用非线性信号分析方法才能较好解决这一问题,然而sEMG非线性信号分析的应用尚属初期探索阶段,有待科研工作者的深入研究。  相似文献