پاورپوینت EMG ، ELECTROMYOGRAPHY

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تعریفemg
نحوه تشکیل سیگنال
آشنایی با اجزاء تشکیل دهنده دستگاه emg
انواع دستگاههایemg
انواع الکترودها
محل قرار دادن الکترودها در بدن
کاربرد emg در ارگونومی


قسمتی از متن
What is an electromyogram?
An electromyogram (EMG) is a test that is used to record the electrical activity of muscles. When muscles are active, they produce an electrical current. This current is usually proportional to the level of the muscle activity. An EMG is also referred to as a myogram.
• Electromyography (EMG), the recording of myoelectric signals which occur when a muscle is in use, can be used to assess the level of activity occurring over a period of time. It can also be used to show the presence of muscle fatigue, a state when a skeletal muscle is unable to maintain the required force of contraction (Hagberg, 1981). A high correlation has been shown between EMG activity and muscular force, for both static and dynamic activities(Hagberg, 1981)

Although needle electrodes, entering specific muscles, are used for medical research, occupational EMG records are usually taken from surface electrodes

EMG ﺗﻌﺮﻳﻒ کوتاه
اﻟﻜﺘﺮوﻣﻴﻮﮔﺮاﻓﻲ ﻳـﻚ ﺗﻜﻨﻴـﻚ آزﻣﺎﻳـﺸﮕﺎﻫﻲ درارﺗﺒـﺎط ﺑـﺎ ﻇﻬـﻮر، ﺛﺒـﺖ و ﺗﺠﺰﻳﻪ و ﺗﺤﻠﻴﻞ ﺳﻴﮕﻨﺎل ﻫﺎي اﻟﻜﺘﺮﻳﻜﻲ ﻋﻀﻠﻪ اﺳﺖ .
ﺳﻴﮕﻨﺎل ﻫـﺎي اﻟﻜﺘﺮﻳﻜـﻲ ﻋـﻀﻠﻪ ﺑﻮﺳﻴﻠﻪ اﺧﺘﻼﻓﺎت ﻓﻴﺰﻳﻮﻟﻮژﻳﻜﻲ در ﺣﺎﻟﺖ ﻏﺸﺎء ﻫﺎي ﺗﺎر ﻋﻀﻼﻧﻲ ﺷﻜﻞ ﻣﻲ ﮔﻴﺮﻧﺪ
EMGﻣﻮارد اﺳﺘﻔﺎده و ﻣﺰاﻳﺎي
EMG ﮔﺴﺘﺮه اﺳﺘﻔﺎده از
ﻋﻼوه ﺑﺮ ﻣﻄﺎﻟﻌﺎت ﭘﺎﻳﻪ اي ﻓﻴﺰﻳﻮﻟﻮژﻳﻜﻲ و ﺑﻴﻮﻣﻜﺎﻧﻴﻜﻲ، ﺣﺮﻛﺖ ﺷﻨﺎﺳﻲ ﺑﻪ ﻋﻨﻮان ﻳﻚ اﺑـﺰار ارزﻳـﺎﺑﻲ ﺑـﺮاي ﺗﺤﻘﻴﻘـﺎت ﻛﺎرﺑﺮدي ﺷﻨﺎﺧﺘﻪ ﺷﺪه اﺳﺖ .ﻓﻴﺰﻳﻮﺗﺮاﭘﻲ / ﺗﻮاﻧﺒﺨﺸﻲ، ﺗﻤﺮﻳﻨﺎت ورزﺷﻲ و اﺛﺮات ﻣﺘﻘﺎﺑـﻞ ﺑـﺪن اﻧـﺴﺎن ﺑـﺎ اﺑـﺰارآﻻت ﺻـﻨﻌﺘﻲ و ﺷﺮاﻳﻂ ﻛﺎري (ارﮔﻮﻧﻮﻣﻲ )از ﺟﻤﻠﻪ ﻛﺎرﺑﺮدﻫﺎي آن است.
ﻣﻨﺸﺎء ﺳﻴﮕﻨﺎل
واﺣﺪ ﺣﺮﻛﺘﻲ
ﻛــﻮﭼﻜﺘﺮﻳﻦ واﺣــﺪ ﻋﻤﻠﻜــﺮدي ﺑــﺮاي ﺗﻮﺻــﻴﻒ ﻛﻨﺘــﺮل ﻋــﺼﺒﻲ ﻓﺮآﻳﻨﺪ اﻧﻘﺒﺎض ﻋﻀﻼﻧﻲ، واﺣﺪ ﺣﺮﻛﺘﻲ ﻧﺎﻣﻴﺪه ﻣﻲ ﺷﻮد، ﻛـﻪ ﺑـﻪ اﻳﻦ ﺻﻮرت ﺗﻮﺻﻴﻒ ﺷﺪه اﺳﺖ : ﺟﺴﻢ ﺳﻠﻮﻟﻲ و دﻧـﺪرﻳﺖ ﻳـﻚ ﻧــﺮون ﺣﺮﻛﺘــﻲ، ﺷــﺎﺧﻪ ﻫــﺎي ﭼﻨﺪﮔﺎﻧــﻪ اﻛــﺴﻮن آن و ﺗﺎرﻫــﺎي ﻋﻀﻼﻧﻲ ﻛﻪ ازآن ﺗﻐﺬﻳﻪ ﻣﻲ ﺷﻮﻧﺪ .ااصطلاح واﺣﺪ" ﺑـﺮاﻳﻦ اﺳـﺎس ﻃــﺮح رﻳــﺰي ﺷــﺪه اﺳــﺖ ﻛــﻪ ﻫﻤــﻪ ﺗﺎرﻫــﺎي ﻋــﻀﻼﻧﻲ ﻳــﻚ واﺣﺪﺣﺮﻛﺘﻲ ﻣﻌﻴﻦ در ﻓﺮآﻳﻨﺪ ﻋﺼﺐ ﮔﻴﺮي ﺑـﻪ ﻃـﻮر ﻳﻜﭙﺎرﭼـﻪ ﻋﻤﻞ ﻣﻲ ﻛﻨﻨﺪ
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