The function of the antagonist muscle during fast limb movements in man.

نویسندگان

  • C D Marsden
  • J A Obeso
  • J C Rothwell
چکیده

We have examined fast flexion movements of the human thumb and fast extension movements of the elbow over three different distances at a variety of speeds in order to elucidate the function of the antagonist muscle in these circumstances. All movements were of such a velocity that they showed the typical bi- or triphasic pattern of muscle activation in agonist and antagonist. Slower movements, with continuous agonist activity, were not analysed. For movements made through the same angle at different velocities, there was a linear relationship between the amount of antagonist activity needed to halt the movement and the peak velocity. However, the slope of this relationship was a function of the distance moved. Movements made through large angles showed less antagonist activity than those made through small angles at the same speed. The timing of the antagonist activity also changed as a function of both distance and speed. Fast, small movements showed earlier onset of antagonist activity than slow, large ones. Movements which were halted mechanically with the subject's prior knowledge had little or no antagonist activity, since it was no longer necessary in these conditions. The complexity of these relations indicates that the triphasic pattern of muscle activity underlying these movements can no longer be regarded as a simple immutable 'programme'. The size and timing of the bursts of muscle activity are subtly adjusted to the precise nature of the task.

برای دانلود رایگان متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Effect of Time Constraind Induced Therapy on Function, Coordination and Movements of Upper Limb on Hemiplegic Adults

Objectives: Stroke, is one of the major causes of disability in adults. So, the patient may prefer to use the non-involved limb to perfom selfcare & named this phenomen learned non used. Constraint induced therapy is one of the rehabilitative interventions that can be effective in restoration of the function of the involved limb in some hemiparetic post stroke patients. purpose of this study wa...

متن کامل

Case Report: Impact of Botulinum Toxin Injection on Function of Affected Upper Extremity in A Patient, 16 Years after Stroke

Objective: Case report Impact of Botulinum Toxin injection on function of affected upper extremity in a patient after 16 years since stroke (CVA). Botulinum toxin injection is one the treatments in spasticity reduction and consequently in recovery of upper limb function in stroke patients. The purpose of this case study is to report the effect of Botulinum toxin injection on upper extremity fun...

متن کامل

Manual motor performance in a deafferented man.

We have studied manual motor function in a man deafferented by a severe peripheral sensory neuropathy. Motor power was almost unaffected. Our patients could produce a very wide range of preprogrammed finger movements with remarkable accuracy, involving complex muscle synergies of the hand and forearm muscles. He could perform individual finger movements and outline figures in the air with high ...

متن کامل

بررسی زمان‌بندی و سطح فعالیت الکتریکی عضلات اطراف مفصل زانو در الگوهای حرکتی فعال و واکنشی در مردان سالم

New studies in neuromuscular control have indicated that the strength of muscle contraction isn’t the only important factor in a task. But the speed at which a muscle responds, preparation of muscle and synergistic pattern at which a group of muscles recruit to a task or respond to a condition are much more important in constant joint stabilization and potential injury prevention. The purpo...

متن کامل

Normalized Electromyography of Shoulder Muscles during Selected Functional Tasks of Upper Limb in Patients with Shoulder Impingement Syndrome

Background & Aims: Precise muscle activity pattern is required to maintain normal shoulder function and any alteration in muscle activity can result in movement impairment. The purpose of this study was to assess normalized electromyography (EMG) of shoulder muscles during selected functional tasks of upper limb in patients with shoulder impingement syndrome. Methods: Test group consisted of 15...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

عنوان ژورنال:
  • The Journal of physiology

دوره 335  شماره 

صفحات  -

تاریخ انتشار 1983