肢位変化が反応動作の開始に及ぼす影響 : 筋電図とMEPによる解析

Effects of proprioceptive neuromuscular facilitation (PNF) position of the upper limb on initiation of phasic voluntary contraction of wrist : Electromyographic and motor evoked potential's (MEP's) analysis

笠井 達哉

広島大学総合科学部紀要. VI, 保健体育学研究

Memoirs of the Faculty of Integrated Arts and Sciences, Hiroshima University. VI, Studies in health and physical education

Proprioceptive neuromuscular facilitation or PNF techniques are often used to induce muscle relaxation and increase joint range of motion. Moreover, the facilitating position of PNF for muscle reeducation induce faster electromyographic reaction time (EMG-RT or EMG latency) in the intended muscle than in the anatomical or kinesiological reference position (neutral position ; N). Thus, the postural modifications of a responding limb can influence the initiation of movements. Since it is presumed that both central direction and peripheral feedback are involved in the initiation of movements at the postural modifications of a responding limb, both influences can be analyzed by measuring EMG latencies of a limb and motor evoked potentials (MEPs) at different postures.

Therefore, in the first experiment I attempted to analyze the effect of the peripheral feedback arising from the PNF position on EMG latency of the upper limb muscles (M. Brachioradialis, M. Triceps brachii and M. Deltoideus). The means of EMG latency in each muscle was shorter in PNF than in N position.

The motor cortex can be excited in normal subjects using electromagnetic stimulation, and the amplitude and the latency to the motor evoked muscle action potential (MEP) allows as assessment of the integrity of corticospinal tracts. Therefore, in the second experiment I applied this technique in the four subjects to investigate the neural mechanism of the effect of PNF position on MEPs. The successful application of this technique suggests that electromagnetic stimulation of the motor cortex has the potential to allow detection of the different effect in the motor cortex in the N and the PNF position.

スポーツ・体育 [ 780 ]

日本語

広島大学総合科学部

Copyright (c) 1990 by Faculty of Integrated Arts and Sciences, Hiroshima University. All rights reserved.

[ISSN] 0289-3002

[NCID] AN10019090