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タイトル: Histological skeletal muscle damage and surface EMG relationships following eccentric contractions
著者: Kano, Yutaka
Masuda, Kazumi link image link image
Furukawa, Hirotaka
Sudo, Mizuki
Mito, Kazuyuki
Sakamoto, Kazuyoshi
増田, 和実
発行日: 2008年10月
出版社(者): 日本生理学会
雑誌名: Journal of Physiological Sciences
ISSN: 1880-6546
巻: 58
号: 5
開始ページ: 349
終了ページ: 355
キーワード: Electrical stimulation
Integrated EMG
Muscle fiber conduction velocity
抄録: This study examined the effects of a different number of eccentric contractions (ECs) on histological characteristics, surface electromyogram (EMG) parameters (integral EMG, iEMG; muscle fiber conduction velocity, MFCV; and action potential waveform), and isometric peak torque using the rat EC model. Male Wistar rats (n = 40) were anesthetized, and ECs were initiated in the tibialis anterior muscle via electrical stimulation while the muscle was being stretched by electromotor. The rats were grouped according to the number of ECs (EC1, EC5, EC10, EC20, EC30, EC40, and EC100). Three days after the ECs, surface EMG signals and isometric peak torque were measured during evoked twitch contractions via electrical stimulation of the peroneal nerve. The muscle damage was evaluated from hematoxylin-eosin (HE) stained cross sections as a relative number of damaged fibers to intact fibers. Intense histological muscle damage (approximately 50% to 70% of the fiber), loss of isometric peak torque, disturbance of action potential waveform, and depression of iEMG (approximately -60% to -70%) were observed at EC20, EC30, EC40, and EC100. On the other hand, the MFCV did not change in any EC group. Although muscle damage and pathological surface EMG signals were not found at EC10, isometric peak torque was reduced significantly. In conclusion, the extent of histological muscle damage is not proportionally related to the number of ECs. Muscle damage was reflected by iEMG and action potential waveforms, but not by MFCV, which remained unaffected even though approximately 50% to 70% of the fiber demonstrated injury.全文公開200911
DOI: 10.2170/physiolsci.RP004908
URI: http://hdl.handle.net/2297/12404
関連URI: http://dx.doi.org/10.2170/physiolsci.RP004908
資料種別: Journal Article
版表示: publisher

このアイテムを引用あるいはリンクする場合は次の識別子を使用してください。 http://hdl.handle.net/2297/12404



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