<Originals>Difference of Posture-related Modulaton of H-reflex Between Forearm and Leg muscle

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概要

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• FUNASE, K., HIGASHI, T., SAKAKIBAEA, A., OGAHARA, K. and IWANAGA, R., Dofference of Posture-related Modulation of H-reflex Between Forearm and Leg muscle. Adv. Exerc. Sports Physilo, Vol.10, No.3 pp.85-92, 2004. The aim of this study was to examine the difference of posture-related modulation between the forearm H-reflex and the leg H-reflex in healty normal subjects and hemiplegic patients with spasticity. H-reflexes were recorded in flexor carpi radialis (FCR) and soleus in both sitting and standing positions. Difference of the presynaptic inhibition of Ia synapses between sitting and standing were assessed by either the relation between background EMG and H-reflex or DI inhibition. Inaddition motor-evoked potentials (MEPs) induced by the transcranil magnetic stimulation were recorded in FCR to explore the modulation via corticospinal pathway in there different postures. Ih healthy subjects, although the decreased soleus H-reflexes were oberved when standing compared to sitting as similar to the previous reports, any difference of FCR H-reflexes were not observed in sitting and standing. However, FCR H-reflexes were increased in standing than sitting in patients. Soleus reflex gain in standing was decreased than sitting. But soleus DI inhibitions were decreased in standing compared to sitting in healthy subjects. We presume that the presynaptic interneurons activated by the conditioning volleys for DI inhibition were occluded by the strong dessending commands accompanying the standing posture. As a result, soleus H-refleexes decreased in standing compared to sitting positions in the healthy subjects. In FCR, unchanged DI inhibition was observed in sitting and standing in healthy subjects. On the other hand, increased FCR DI inhibitions were observed in standing compared to sitting in the patients. Occlusion effect wold be released by the decreased descending commands to the presynaptic interneunrons in standing than sitting. In addition, any difference of MEPs in sitting and standing were not observed in healthy subjects and the patients. Based on these results, we suggest that differences of the posture-related descending control probably affects the presynaptic interneurons between soleus and FCR. Dysfunction of this neural mechanism may lead to increase the stretch reflex gain of FCR in standing in patients with spasticity.

著者

• Funase Kozo

  Laboratory Of Human Motor Control School Of Health Sciences Nagasaki University

• Funase Kozo

  Laboratory Of Human Motor Control School Of Health Science Nagasaki University

• Higashi Toshio

  Laboratory Of Human Motor Control School Of Health Sciences Nagasaki University

• Ogahara Kakuya

  Wajinkai Hospital

• SAKAKIBARA Atsushi

  Department of Rehabilitation, Hospital Attached to School of Medicine, Nagasaki University

• IWANAGA Ryuichiro

  Laboratory of Human Motor Control, School of Health Sciences, Nagasaki University

• Iwanaga Ryuichiro

  Laboratory Of Human Motor Control School Of Health Sciences Nagasaki University

• Sakakibara Atsushi

  Department Of Rehabilitation Hospital Attached To School Of Medicine Nagasaki University

• Higashi Toshio

  Division Of Physical Therapy And Occupational Therapy Science Graduate School Health Science Nagasak

• Higashi Toshio

  Division Of Physical Therapy And Occupational Therapy Science Graduate School Health Science Nagasaki University

関連論文

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• Difference of Posture-related Modulaton of H-reflex Between Forearm and Leg muscle
• Posture-related modulations of human soleus and FCR H-reflex
• Neural Mechanism Underlying the H-reflex Inhibition During Static Muscle Stretching
• Excitability Changes in the Human Primary Motor Cortex During Observation with Motor Imagery of Chopstick Use
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