ࡱ> >@=q` RbjbjqPqP2":: *acccccc$ !ht#$a a a  a a a a   PT " a0 $ $ 2$t  l  a a a a  Title:Magnetic resonance imaging of human mandibular elevator muscles after repetitive maximal clenching exercise Author(s): HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Gan+YH&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Gan YH,  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Sasai+T&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Sasai T,  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Nishiyama+H&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Nishiyama H,  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Ma+XC&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Ma XC,  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Zhang+ZK&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Zhang ZK,  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=OneClickSearch&field=AU&val=Fuchihata+H&curr_doc=40/1&Form=FullRecordPage&doc=40/1" \o "one-click search" Fuchihata H Source:ARCHIVES OF ORAL BIOLOGY 45 (3): 247-251 MAR 2000 Document Type:Article Language:English  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=PagedCitedRefList&UT=000086200400008&doc=40/1&rec_id=114328690" Cited References: 17  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=DispCitingRec&doc=40/1&isickref=114328690" Times Cited: 5  HYPERLINK "http://wos23.isiknowledge.com/CIW.cgi?SID=Z2BpEl7c9GkG4GojDN9&Func=EasyRelated&UT=000086200400008&doc=40/1&rec_id=114328690"  INCLUDEPICTURE "http://images.isiknowledge.com/WoK3/Images/relrec.gif" \* MERGEFORMATINET  HYPERLINK ""  INCLUDEPICTURE "http://images.isiknowledge.com/WoK3/Images/info.gif" \* MERGEFORMATINET  Abstract:Exercise can enhance the signal intensity (SI) of skeletal limb muscles on T-2-weighted magnetic resonance imaging (MRI). The purpose here was to evaluate the effects of repetitive maximal clenching exercises involving the mandibular elevator muscles with T-2-weighted MRI. Seven normal volunteers were imaged before and immediately after performing repetitive maximal clenching and at 3, 6, 9, 12. 15, 20 min after the exercise in a 1.5 T GE magnet with spin-echo sequences. SI in the masseter, medial pterygoid and temporalis increased significantly (p < 0.001) and the cross-sectional area (CSA) of masseter increased 10.11% on T-2-weighted MRI after exercise. The increased SI and CSA declined approximately to the pre-exercise level in about 20 min after exercise. No SI and CSA changes were found in the inactive neck muscle and no SI changes in the mandibular bone marrow (p > 0.05). The findings suggest that the use of exercise-enhanced MRI might be helpful in the study of the function and dysfunction of muscles in the orofacial region. (C) 2000 Published by Elsevier Science Ltd. All rights reserved. Author Keywords:masticatory muscle; magnetic resonance imaging (MRI); exercise signal intensity KeyWords Plus:T2 RELAXATION-TIMES; ECHO MRI TECHNIQUES; SKELETAL-MUSCLE; WATER; REPRODUCIBILITY; ERRORS; T1 Addresses:Gan YH (reprint author), Beijing Med Univ, Sch Stomatol, Dept Oral Radiol, Beijing, 100081 Peoples R China Beijing Med Univ, Sch Stomatol, Dept Oral Radiol, Beijing, 100081 Peoples R China Osaka Univ, Fac Dent, Dept Oral Radiol, Suita, Osaka 565 Japan Publisher:PERGAMON-ELSEVIER SCIENCE LTD, THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND Subject Category:DENTISTRY, ORAL SURGERY & MEDICINE IDS Number:299LQ ISSN:0003-9969 rt~4 5 ; < > ? | } < = E F H I     жККККiККiККiККiККi,hhhh>*B*CJKHOJQJ^Jph2hhhh5>*B*CJKHOJQJ\^Jph6jhhhhB*CJKHOJQJU^JaJph3hhhh5B*CJKHOJQJ\^JaJph-hhhhB*CJKHOJQJ^JaJph/hhhh5B*CJKHOJQJ\^Jph)t L d w tDLgdh $1$a$gdh $1$9Da$gdh    1 L Z d m w x #$>?@蚀i蚀iM6jhhhhB*CJKHOJQJU^JaJph,hhhh>*B*CJKHOJQJ^Jph2hhhh5>*B*CJKHOJQJ\^Jph6jhhhhB*CJKHOJQJU^JaJph3hhhh5B*CJKHOJQJ\^JaJph/hhhh5B*CJKHOJQJ\^Jph-hhhhB*CJKHOJQJ^JaJph@    tDNLV̰}̰eeeeeeee]hhhDo(/hhhh5B*CJKHOJQJ\^Jph6jhhhhB*CJKHOJQJU^JaJph-hhhhB*CJKHOJQJ^JaJph6jhhhhB*CJKHOJQJU^JaJph6jhhhhB*CJKHOJQJU^JaJph-hhhhB*CJKHOJQJ^JaJph0182P. 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