نتایج جستجو برای: fatigue
تعداد نتایج: 70017 فیلتر نتایج به سال:
in the present study, mechanical properties and low cycle fatigue behavior of a solid-solutionized aa6061 aluminum alloy produced by equal channel angular pressing (ecap) process were investigated. the grain refinement after two passes of ecap significantly increased the yield stress and ultimate tensile stress and decreased the ductility of the alloy. however, the improvement of low cycle fati...
introduction: this study investigated the fatigue and fracture modes of race and protaper rotary instruments. materials & methods: fatigue resistance was evaluated by rotating the files 30 ° or 60 ° and with 2 or 5mm radius of curvature. race taper 06 size 25 and protaper f1 files (n=40) were used. the number of rotations to failure was analyzed by two-way anova and independent sample t-tes...
Backgrond and Aim: Fatigue is a common and highly prevalent problem among workers. Muscle fatigue is the result of general fatigue that is caused by different risk factors. This research was conducted to assess grip fatigue between workers with manual tasks and its relationship to psychosocial risk factors. Methods: In this study, Jamar hydraulic dynamometer was used to investigate the decreas...
Background: Muscle fatigue is an important issue in neuromuscular rehabilitation. Better control of this phenomenon would result in better prevention of its consequent physiological damages.Objective: To provide a mathematical representation of muscle fatigue as a function of time.Methods: We conducted this study by combining the EMG-based estimation methods of muscle activation with the availa...
Objectives: Postural control is the act of maintaining and restoring a better state of balance and proper biomechanics structure in limbs and different parts of the body. Such proper structure exists in two forms namely static and dynamic. Fatigue is one of the factors that affect the postural control and body stability. The purpose of this study was to examine the effect of hip abductor musc...
Objectives: Lower extremity muscles are important for maintaining dynamic balance and athletic performance. Fatigue of these muscles may affect dynamic balance. It is not clear whether fatigue in a particular muscle group can affect dynamic balance more than fatigue in other groups. This study was conducted to evaluate and compare the effects of fatigue in five muscle groups on the dynamic bala...
Despite the importance of core muscles in kinetic chains, the importance of each muscle compared to others has rarely been investigated. The purpose of this study was to compare the effect of each core muscle fatigue on lower extremity function tests. This quasi-experimental study with a pretest-posttest design was performed on 30 physical educations, female students with the mean age of 23.46±...
Introduction: Exhaustive exercise leads to muscle fatigue and reduces muscle power in response to contractile activity and causes central fatigue. On the other hand, the effects of opioids on skeletal muscles and fatigue phenomenon are not known completely. Thus, the current study aimed to assess the effect of a single dose administration of opium on muscle and central fatigue in male rats. ...
background: tiredness is one of the most common complaints among pregnant women, but little attention has been paid to its importance and a way to control it. reflexology can be employed as a nursing intervention to reduce it. the purpose of this study was to determine the effect of reflexology on the tiredness intensity in pregnant women.methods: this study was carried out on 74 pregnant women...
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