[Effects of isometric contraction training by electrostimulation on Type I and II hindlimb muscles in cerebral ischemia model rats].
OBJECTIVE
The purpose of this study was to examine the effects of cerebral ischemia on Type I(soleus) and Type II(plantaris, gastrocnemius) muscles, and to determine the effects of isometric contraction training by electrostimulation on Type I and II muscles in cerebral ischemia model rats.


METHODS
Twenty-five male Sprague-Dawley rats were randomly divided into four groups: ST(stroke), STES(stroke+electrostimulation), SH(sham) and SHES (sham+electrostimulation). The ST and STES groups received a transient right middle cerebral artery occlusion operation. The SH and SHES groups received a sham operation. The STES and SHES groups had daily isometric contraction training by electrostimulation(100 Hz, 45 mA, 7.5 V) on hindlimb muscles for 7 days.


RESULTS
Plantaris and gastrocenmius muscle weight, myofibrillar protein contents of soleus and gastrocnemius, and the muscle fiber cross-sectional area of gastrocnemius in the ST group significantly decreased compared with the SH group. Soleus, plantaris, gastrocnemius muscle weight, myofibrillar protein contents of soleus and gastrocnemius, and the Type I muscle fiber cross-sectional area of soleus and the Type II muscle fiber cross-sectional area of gastrocnemius in the STES group significantly increased compared with the ST group.


CONCLUSIONS
Hindlimb muscle atrophy occurs after acute stroke and isometric contraction training by electrostimulation during early stages of a stroke attenuates muscle atrophy of Type I and Type II muscles.
Lee
Yoon-Kyong
YK
College of Nursing, Seoul National University, Jongro-Gu, Seoul, Korea.
Choe
Myoung-Ae
MA
An
Gyeong Ju
GJ
D000818:Animals; D001835:Body Weight; D002545:Brain Ischemia / Q000150:complications*; D004195:Disease Models, Animal; D004558:Electric Stimulation; D006614:Hindlimb; D007537:Isometric Contraction; D008297:Male; D009124:Muscle Proteins / Q000032:analysis; D018482:Muscle, Skeletal / Q000378:metabolism / Q000473:pathology / Q000503:physiopathology*; D009133:Muscular Atrophy / Q000209:etiology* / Q000473:pathology / Q000503:physiopathology; D009210:Myofibrils / Q000737:chemistry; D051381:Rats; D017207:Rats, Sprague-Dawley; D020521:Stroke / Q000150:complications*
D009124:Muscle Proteins