File Name: spinal and supraspinal factors in human muscle fatigue .zip
- Supraspinal factors in human muscle fatigue: evidence for suboptimal output from the motor cortex.
- Muscle fatigue: general understanding and treatment
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Strenuous exercise leads to a progressive reduction in the performance of voluntary physical exercise. This is due to a process described as fatigue and is defined as the failure to maintain the required or expected power output. While some of this is muscular in origin, there are data suggestive of how fatigue is modulated by cortical signals, leading to a concept of central fatigue.
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Supraspinal factors in human muscle fatigue: evidence for suboptimal output from the motor cortex.
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In this and the subsequent companion paper, results are presented that collectively seek to delineate the contribution that supraspinal circuits have in determining the time to task failure TTF of sustained submaximal contractions. The purpose of this study was to compare adjustments in supraspinal and spinal excitability taken concurrently throughout the performance of two different fatigue tasks with identical mechanical demands but different TTF i. Single-pulse transcranial magnetic stimulation TMS , paired-pulse TMS, paired cortico-cervicomedullary stimulation, and brachial plexus electrical stimulation were delivered in a 6-stimuli sequence at baseline and every 2—3 minutes throughout fatigue-task performance. Together, these results suggest that as fatigue develops prior to task failure, the increase in corticospinal excitability observed in relationship to the decrease in spinal excitability results from a combination of decreasing intracortical inhibition with constant levels of intracortical facilitation and upstream excitability that together eventually fail to provide the input to the motor cortex necessary for descending drive to overcome the spinal cord resistance, thereby contributing to task failure. This is an open-access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Additionally, internal support for this work was provided by a grant from the Research and Scholarly Affairs Committee at the Ohio University Heritage College of Medicine. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Muscle fatigue: general understanding and treatment
We investigated the cross-over effect of muscle fatigue and its time course on the non-exercising contralateral limb NEL after unilateral fatiguing contractions of the ipsilateral exercising limb EL. For this purpose, 15 males performed two bouts of second maximal isometric knee extensions with the exercising limb, and neuromuscular function of both the EL and NEL was assessed before PRE , after a first fatiguing exercise MID and after a second fatiguing exercise POST. At MID, torque decline of the EL was strictly associated to an alteration of the mechanical twitch properties evoked by neurostimulation of the femoral nerve i. According to these markers, we suggest that peripheral fatigue occurred. These findings indicate that two bouts of unilateral fatiguing exercise were needed to induce a cross-over effect of muscle fatigue on the non-exercising contralateral limb. Differential adjustments of the motor pathway peripheral fatigue vs. Given that our unilateral fatiguing exercise induced immediate maximal torque reduction in the EL and postponed the loss of torque production in the NEL, it is also concluded that the time course of muscle fatigue differed between limbs.
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Fri, Mar 5, Remember me Create Account Reset Password. Keywords: Reaction time , Functional fatigue , Gender. Introduction Reaction time is a proper indicator to assess the speed of the central nervous system processing and coordination between the sensory and motor systems [ 1 ].
Какая-то бессмыслица. Вначале был зарегистрирован нормальный ввод замка, в тот момент, когда она выходила из помещения Третьего узла, однако время следующей команды отпирания показалось Сьюзан странным. Две эти команды разделяло меньше одной минуты, но она была уверена, что разговаривала с коммандером больше минуты.
Мидж вздохнула: - А что еще это может. - Это может быть не вашим делом! - раздался зычный голос у них за спиной. Мидж от неожиданности стукнулась головой о стекло. Бринкерхофф опрокинул директорский стул и бросился к двери. Он сразу же узнал этот голос.
Она молила Бога, чтобы Стратмору звонил Дэвид. Скажи мне скорей, что с ним все в порядке, - думала. - Скажи, что он нашел кольцо. Но коммандер поймал ее взгляд и нахмурился. Значит, это не Дэвид.
Беккер оказался на прямом отрезке, когда вдруг улочка начала подниматься вверх, становясь все круче и круче.