View clinical trials related to Muscle Fatigue.
Filter by:The purpose of this study is to determine the optimal time interval between light emitting diode application and exercise to improve fatigue resistance.The results of this study could be useful in planning a rehabilitation program in musculature disorders and also in athletic training.
The objective is to assess if TENS will improve the muscle recovery rate from post-exercise fatigue.
PURPOSE: To investigate the effect of cervical muscle Fatigue on neck proprioception and postural stability during cervical flexion. BACKGROUND: Postural stability is the ability to maintain the body in equilibrium either at rest or in a steady state of motion . Muscle fatigue is the diminished response of muscle to repeated stimulus. Cervical proprioceptive inputs provide important somatosensory information influencing postural stability. Hence, the investigators performed this study to evaluate the effect of experimentally induced fatigue on general cervical musculature on postural stability . HYPOTHESES: This study will hypnotize that: 1. Cervical flexor muscle fatigue will have a significant effect on neck proprioception 2. Cervical muscle fatigue will have a significant effect on posture stability RESEARCH QUESTION: Will fatigue of cervical flexors have an effect on neck proprioception and postural stability?
This study is expected to demonstrate that during experimental days of seated computer work sustained and focalized low-level muscle activity contributes to the development of long-lasting fatigue effects (and thus possible disorder). On days with and without frequent interruptions, signs of fatigue and the activity pattern of the trapeze muscle are registered and compared using electromyographic registrations of the trapezius muscle.
The practice of mountain running or "trail" is in full development in France and elsewhere in the world. This sporting practice associates specific physiological constraints related in particular to the duration of the efforts made (several hours) and to the ground (important elevation, technical ground, average altitude). Some studies have allowed the last 10 years to initiate the exploration of the physiological consequences of this type of practice, especially from a muscular point of view. However, some important questions remain to be clarified such as the impact of these sports events on fatigue and muscle recovery, cardiovascular, energy and water balance disturbances caused, induced sleep changes and the kinetics of recovery of the various parameters. . These elements remain in particular to be studied in very different racing contexts as currently developed by the organizers, namely race in one stage from long to very long distances (40 to 160 km) and race in stages (4 days, 4 x 40 km) as encountered in the Grenoble UT4M race (Ultra Tour des 4 Massifs).
This study aims at examining the influence of both physically and cognitively induced fatigue on trunk motor control on the one hand and brain activity related to movement preparation on the other hand, in healthy adult subjects. Furthermore, a comparison between the effects of both types of fatigue will be made. For this purpose a motor control task will be performed and compared before and after 3 specific interventions: i.e. a control intervention, a physical task and a cognitive task. Muscle and brain activity will be measured during each motor control task. It is hypothesised that motor control will not be altered after a control task, i.e. seated rest for 45 minutes. With regards to the physical fatigue condition, it is expected that trunk muscles will contract earlier after this task than before due to altered motor control. Cognitive fatigue is hypothesised to have similar underlying processes as physical fatigue, thus a similar earlier muscle contraction is also expected after cognitive fatigue. Lastly, as both types of fatigue are expected to induce a similar effect on motor control no significant differences between cognitive and physical fatigue are hypothesised. However, it is possible that the magnitude of this effect differs between types of fatigue, i.e. that 1 of both types has a bigger effect on motor control than the other. With regards to brain activity in preparation of a motor control task similar hypotheses are formulated: no effect of the control task on brain activity, earlier and possibly increased brain activity after both fatiguing tasks, and no differences between both types of fatigue besides a possible difference in magnitude of effect.
800-nm laser light has been shown to delay muscle fatigue when applied before exercise. The effect of illumination during the aerobic phase of strenuous exercise has not been studied. The investigators hypothesize that the increased energy donated to cells during the aerobic phase will significantly delay muscle fatigue. A novel aspect of this study is to include simultaneous treatment with near infrared light at 800 nm and 905 nm. Fatigue index and change in lactate blood level will be used to compare the different laser treatments for each participant. Monte Carlo simulations of light energy reaching the muscle will be carried out, based on skin-fold thickness measurements of each participant. The investigators believe this will be the first report of optical dosimetry as a function of adipose thickness and it will enable estimation how much of the light applied to the skin surface is able to penetrate to the muscles that are thought to be affected. The results of this study will help clinicians to optimize treatment for individual patients.
Orofacial pain encompasses painful conditions, such as temporomandibular disorder. Multidisciplinary health teams seek to control such musculoskeletal disorders to improve the quality and functional capacity of the muscles of mastication. The aim of the proposed study is to evaluate the effect of low-level laser therapy as a form of treatment for the prevention of initial fatigue of the muscles of mastication (masseter and anterior temporal muscles) as well as the recovery of these muscles after induced exhaustion (caused by isometric contraction) in young adults. The participants will be 78 (n obtained from calculation of the sample size with p < 0.05) healthy male and female volunteers between 18 and 34 years of age. The volunteers will be randomly allocated to a laser group (n = 26), sham group (n = 26) and control group (n = 26). All participants will be submitted to a clinical evaluation to record mandibular movements, bite force, muscle sensitivity to palpation and initial muscle fatigue. Initial fatigue will be induced by isometric contraction of the jaws. Maximum voluntary contraction will be performed to record the time until initial exhaustion of the masseter muscle (determined by electromyography). The groups will then be submitted to the interventions: 1) active laser therapy (wavelength: 780 nm; fluence: 134 J/cm2; power: 50 mW; irradiance: 1.675 W/cm2; exposure time: 80 seconds per point) on three points of the masseter and one point on the anterior temporal muscles on each side, 2) sham laser (placebo effect) or 3) no intervention (control). Maximum voluntary contraction will be performed again after the interventions to record the time until initial exhaustion of the masseter muscle (determined by electromyography). Differences in individual time until exhaustion between the pre-intervention and post-intervention evaluations will be measured to determine the effect of low-level laser therapy.
Introduction: Cycling represents a very important level of practice, being among the most practiced sports in Spain. As in any other sport discipline, its practice is associated with the appearance of overloads and sports injuries. Specifically, the 2 most affected areas are the lumbar and knee areas, with an annual prevalence of 58% and 36%, respectively. There is no clear hypothesis to explain the low back pain associated with the practice of cycling, but several authors agree that it may be due to holding an inverted posture of the rachis and the characteristics associated with this sport: long duration, static posture, high intensities, vibrations generated by the terrain, and so forth. The project proposes to analyze the acute effect of a long-lasting bicycle trip (3 hours) on the muscles involved in low back and knee pain, see, lumbar paravertebral, quadriceps and hamstrings, by means of tensiomyography (TMG). Objectives: the main objective of this study is to evaluate the behavior of the mechanical characteristics of the lower back and thigh muscles, by means of tensiomyography, in amateur cyclists after an acute effort on road and mountain bikes, and to study their possible relationship with low back pain (LBP).
This study evaluates the effects of an isokinetic fatigue protocol of the quadriceps on the amount of co-contractions of this last with the hamstrings during a maximal isometric flexion movement in hemiparetic stroke patients. The effect of such a protocol on gait parameters and spasticity of the quadriceps will be evaluated also.