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I NSTRUCTORCOPY–BI OPACEMG L0 1& L0 2ANSWERS,DO NOTLETSTUDENTS COPY! Le s s o n1 ELECTROMYOGRAPHYI S t an da r da n dI n t e g r a t e dEMG DATAREPORTANSWERGUI DE

I.

Dat aa ndCa l c ul a t i o ns

Sub j e c tPr o fil e Na me

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Ge n d e r : Ma l e / Fe ma l e A. EMGMe a s u r e me nt s

Fo r e a r m 1( Do mi na nt ) Fo r e a r m2 Cl us t e r# Mi n Ma x PP Me a n Mi n Ma x PP Me a n [ 3mi n][ 3ma x ][ 3pp] [ 4 0me an] [ 3mi n][ 3ma x ][ 3pp][ 4 0me a n] 1 2 3 4 Th eme a nme a s u r e me n t swi l lb ed e pe n d e n to nt h ea mo un to ft i mef o re a c hc l u s t e r . Th ea r e ame a s u r e me n t ss h o u l db ef o r1 s e cmi d s e c t i on . B. Us et h eme a nme a s ur e me n tf r o mt h et a b l ea bo v et oc omp u t et h ep e r c e n t a g ei n c r e a s ei nEMG

a c t i v i t yr e c o r d e db e t we e nt h ewe a k e s tc l e n c ha n dt h es t r o n g e s tc l e n c ho fFo r e a r m1 . Ca l c u l a t i o n :

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II.

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QUESTI ONS

C. Do e st h e r ea p p e a rt ob ea n yd i ffe r e n c ei nt o n u sb e t we e nt h et wof o r e a r mc l e n c hmu s c l e s ?_ _ _ _ _

Ye s _ _ _ _ _No Wo u l dy o ue x p e c tt os e ead i ffe r e nc e ?Doe ss u b j e c t ’ ss e xi n flu e n c ey ou re x p e c t a t i o n s ?Ex p l a i n . Be c a u s et o n usi si nflu e n c e db yma n yi n d i v i d u a lf a c t o r s , t o n u sc o u l dd i ffe rb e t we e nf o r e a r ms i fa ni n d i v i d ua lu s e son ea r mmo r et h a nt heo t h e ra r mo ri ft h emu s c l efib e r swe r el a r g e ri n on ea r mt h a nt h eo t h e ra r m.

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To n u si si n d i r e c t l yi n flu e n c e db yg e n d e rb e c a u s emu s c l efib e rs i z ei si n flu e n c e db y t e s t o s t e r o n el e v e l s ,wh i c hv a r yb e t we e nma l e sa n df e ma l e s . D. Co mp a r et h eme a nme a s u r e me n tf o rt h er i g h ta n dl e f tma x i mu mc l e n c hEMGc l us t e r .Ar et h e y

t h es a meordi ffe r e n t ?_ _ _ __Sa me

__ _ _ _Di ffe r e nt

Wh i c ho n es u g g e s t st h eg r e a t e rc l e n c hs t r e n g t h ? _ _ _ _ _Ri g h t _ _ _ _ _Le f t _ _ _ _ _Ne i t h e r Ex pl a i n . Th el a r g e rme a s u r e me nts u g g e s t sg r e a t e rc l e n c hs t r e n g t hb e c a u s et h es t r e n gt ho ft h emu s c l ei s d e pe n d e nto nt h es i z e( c r o s ss e c t i o n a la r e a )o ft h emu s c l efib e r s .Th eg r e a t e rt h es i z eo ft h e mus c l efib e r s ,t h eg r e a t e rt h eEMG. E. Wh a tf a c t o r si na d d i t i o nt os e xc o nt r i b u t et oob s e r v e dd i ffe r e n c e si nc l e n c hs t r e n g t h ?

Cl e nc hs t r e n g t hc a nb ei n flu e n c e db yr e s i s t a n c et r a i n i n go fh i g hi n t e n s i t y , q u i c kmo v e me n t s p r a c t i c e di ns ho r tb ou t s .Th i st yp eo fa n a e r o b i ce x e r c i s ec a u s e smu s c l ee n l a r g e me n td u et o s yn t h e s i so fa c t i na n dmy o s i nmo r ec r o s s b r i d g e sf o r me di n c r e a s e dc o n t r a c t i l es t r e n g t h . Ot he rf a c t o r sa ffe c t i n gc l e nc hs t r e n g t ha r er e c o v e r yf r o mf a t i g u ea nda v a i l a b i l i t yo fe n e r g y s t or e s .

F. Ex p l a i nt h es o u r c eofs i g n a l sd e t e c t e db yt h eEMGe l e c t r o d e s .

Ba s i c a l l y ,s i g n a l sd e t e c t e db yt heEMGe l e c t r o d e sc omef r o mt h ee l e c t r i c a la c t i vi t yo ft h e mus c l e . De p e n d i n go nl e c t u r ema t e r i a l t h eAPp r o p a g a t i o no ft hes a r c o l e mma .Ot h e ra c t i v i t yb e s i d e s t h o s eo ft h emus c l ec o n t r i b ut eami n o rpo r t i o no ft h er e c o r d i n g . G. Wh a td oe st h et e r m“ mo t o run i tr e c r u i t me n t ”me a n ?

Mo t o rUni tRe c r u i t me n ti st h ea c t i v a t i o nofi n c r e a s i n gn u mbe r so fmo t o ru n i t si namu s c l et o a c h i e v egr a d e dl e v e l so fc o n t r a c t i l es t r e n g t h . H. De fin es k e l e t a lmus c l et o n u s .

Sk e l e t a lmu s c l et o n u si st h eb a s e l i n ea c t i v i t yl e v e l so famu s c l e I.

De fin ee l e c t r omy o g r a p h y . El e c t r o my o gr a p h yi st h es t u d yo fr e c o r d i n g so fmu s c l ea c t i v i t y. Endo fLe s s o n1Da t aRe po r tAns we rGui de

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Le s s o n2 ELECTROMYOGRAPHYI I Mo t o ru n i tr e c r u i t me n ta n dFa t i g ue DATAREPORTANSWERGUI DE

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A. Co mpl e t eTa bl e2 . 1us i n gS e g me n t1d a t a . No t e :Yo uma yn o tn e e dn i n ep e a k st or e a c hma x . Ta bl e2 . 1Se g me nt1Da t a Fo r e a r m 1( Do mi na nt )

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Fe ws t u d e n t swi l le x c e e d3 0k gc l e n c hf o r c e .

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B. Co mp l e t eTa b l e2 . 2u s i n gS e g me n t2d a t af r o me a c ha r m. Ta bl e2 . 2Se g me nt2da t a Fo r e a r m 1( Do mi na nt )

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DONOTDOFOREARM 2 Ba s e5 0 % #o nt h ev a l u eo b t a i n e df o rMa xc l e n c h .Dr a gc u r s o rb a c k f r o mt h i sp o i n tt oma x .f or c e . Th i sg i v e sy o ut i met of a t i g ue( i g n o r ei fan e g .#i sr e p o r t e d ) I I . Que s t i o ns

C. I st h es t r e n g t ho fy ou rr i gh ta r md i ffe r e n tt h a ny ourl e f ta r m?

Ye s

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dof or e ar m2 } ( 1 )I st he r ead i ffe r e n c ei nt h ea b s o l u t ev a l u e so ff o r c eg e n e r a t e db yma l e sa n df e ma l e si ny o u r c l a s s ? Ye s No Wh a tmi g h te x p l a i na n yd i ffe r e n c e ? Fo r c eg e n e r a t i o ni sde p e n de n to ns i z e( c r o s s s e c t i on a la r e a )o fmu s c l efib e r s .Th es i z e d i ffe r swi t ht y p eo ft r a i n i n ga n dl e v e l so ft e s t o s t e r o n e . Re s i s t a n c et r a i n i n go fq u i c ka c t i o n s ,s ho r tb o ut s , a n dh i ghi n t e n s i t yc o n t r i b u t et o i n c r e a s e ds y n t h e s i so fa c t i na n dmy o s i na n dmo r ec r o s s br i d g ef o r ma t i o nd u r i n g c o nt r a c t i o n . Te s t o s t e r o nea ffe c t smus c l ema s sb yi n c r e a s i n gt h enu mb e ro fmy o s i na n da c t i n p r o t e i n si nmu s c l efib e r s . ( 2 )Wh e nh o l d i n ga no b j e c t , d oe st h en u mbe ro fmo t o run i t sr e ma i nt h es a me ? Ar et h es a memo t o ru n i t su s e df o rt h ed u r a t i o no fho l d i n gt h eo b j e c t ? Ye s ,n u mb e ro fmo t oru n i t sr e ma i nt h es a me . No ,d i ffe r e n tmo t oru n i t sa r eus e ds e q u e n t i a l l yi nor d e rt od e l a yf a t i g u ei ns p e c i fic mo t o ru n i t s . ( 3 )Asy o uf a t i g u e ,t h ef o r c ee x e r t e db yy o u rmu s c l e sd e c r e a s e s .Wh a tp h y s i o l o gi c a lp r o c e s s e s e x p l a i nt h ed e c l i n ei ns t r e n g t h? 1 )Ne u r o mu s c u l a rf a t i gu ei nwh i c ht hemo t o rn e ur o nha sr e d uc e da v a i l a b i l i t yo f a c e t y l c h o l i n et h e r e b yr e du c i n gt h ee n d pl a t ep o t e n t i a la n dt h en u mb e ro fmu s c l e APs .Ge n e r a l l y ,t h emus c l ewi l lf a t i g u ep r i o rt on e u r o mu s c u l a rf a t i g u e . 2 )Th e r ema yb el e s sATPa v a i l a bl ef o rc r o s s b r i d g ea c t i o n .Re du c i n gt h en u mb e ro f c r o s s br i dg e sr e d u c e st h ef o r c eo ft h ec o n t r a c t i o n.

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3)La c t i ca c i da c c u mu l a t i o ni n t e r f e r e swi t ht h ec o u p l i n go fmu s c l eAPwi t h c o n t r a c t i l ep r o c e s s e s . 4 )Th ei o n i cb a l a n c ef o rAPp r o p a g a t i o nma yb ea ffe c t e db yt h er e l a t i v el a c ko fATPf o r + + t h eNaK ATPa s ep u mps ot h a tAPp r o p a g a t i o ni si mp a i r e d. ( 4 )De fin eMo t oruni t Amo t o ru ni tc o n s i s t so fo nemo t o rn e ur o na n dt h emu s c l efibe r st h a tt h emo t o r ne u r o ni n n e r v a t e s . Th emo t o rn e u r o nh a sma n yt e r mi n a l swi t he a c ht e r mi n a le n di n g onad i ffe r e n tmu s c l efibe r . De fineMo t o runi tr e c r ui t me nt Mo t o ru n i tr e c r u i t me nti st h ea c t i v a t i o no fi n c r e a s i n gn u mb e r so fmo t o ru n i t si namus c l e t oa c h i e v eg r a d e dl e v e l so fc o n t r a c t i l es t r e n g t h . De fineFa t i g ue Fa t i g u ei sadr o pi nmu s c l ef o r c eg e ne r a t i o nf o rag i v e nl e v e lo fs t i mu l a t i o n .A de fin i t i o nf o rmu s c l ef a t i g u ei st h ep h y s i o l o g i c a li n a b i l i t yt oc o n t r a c t . { I nt h i sl a b ,wel o o ka tf a t i g u eb yme a s u r i n gt h et i mei tt a k e st or e a c h½o f MAXI MUM c o n t r a c t i o n .Wed o n ’ tme a s u r et h et i mei tt a k e st or e a c haf o r c e g e n e r a t i o no f0k ga ss u c hap o i n two u l dn o tb er e a c h e d :t h e r ewi l la l wa y sb eamo t or un i t ( s )t h a tc a npr o d u c es o meou t p utu p o ns t i mu l a t i o n( f r o my ou rn e r v o uss y s t e m) } De fineEMG El e c t r o my o gr a p h y( EMG)i st h es t ud yo fr e c o r d i n g so fmu s c l ea c t i v i t y . De fineDy na mo me t r y Dy na mo me t r yi st h es t u d yofp o we ro u t p u to famu s c l eorg r o u po fmu s c l e s .Po we ri s de fin e da swo r k / t i me ;wor k=f o r c eXd i s t a n c e , a ndt h ef o r c ei sd u et ot h el e v e l so f mu s c l ec o nt r a c t i l ea c t i v i t y( o rc r o s s b r i d g ef or ma t i o n) Endo fLe s s o n2Da t aRe po r tAns we rGui de...