<Originals>Neural Mechanism Underlying the H-reflex Inhibition During Static Muscle Stretching

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概要

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• FUNASE, K., HIGASHI, T., SAKAKIBARA, A., TANAKA, K., TAKEMOCHI, K. and IWANAGA, R., Neural Mechanism Underlying the H-reflex Inhibition During Static Muscle Stretching. Abv. Exerc. Sports Physiol., Vol.9, No.4 pp.9-4, 2003. We have explored the nenral mechanism for H-reflex inhibition during static muscle stretching (SS), assessed by the simultaneous observation of the homosynaptic post-activation depression (PAD) and the presynaptic inhabition of Ia terminals on motoneurnos (MNs), called D1 inhibition, with the range of motion (ROM) of the joint. Twenty-one healthy normal subjects, with the different ROMs of ankle, gave informed consent to participated in various experiments. H-reflexes were evoked in right soleus by stimulating the tibial nerve every 3 s with 1 ms pulses. To make SS condition, the joint was passively dorsiflex at two different angles. PAD and D1 experiments of triple schoks (333 Hz, motor threshold ×　1.5) to the common peroneal nerves to evoke the contraction of tibialis anterior, which makes the ankle dorsiflex during SS. The interval between CS and test shock (TS) was fixed at 500 ms which is the most effective interval to reveal the PAD. CS-TS interval was fixed at 20 ms which induces maximal D1 inhibition. In subject with a smaller ROM (i.e., stiff ankle), H-reflex inhibition was enhanced, but PAD was attenuated. D1 inhibition, however, was consistently observed with the differnt ROMs. Weak PAD in low ROM (low stiff ankle) during SS suggests that the low-threshold Ia afferent is responsible for PAD. In contrast, enhanced H-reflex inhibition during SS in low ROM suggests that the high-threshold Ib afferent (i.e., postsynaptic pathway), inhibits the MN excitability. D1 is induced by the segmental pathway via the presynaptic inhibition, not muscke stretching. D1, therefore, is consistent during SS in subjects with different ROMs.

• 日本運動生理学会の論文

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

• Tanaka Koji

  Miharadai 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

• TAKEMOCHI Keta

  Yurino Hospital

• 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

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