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19 terms

resistance torque

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resistance torque greater than muscle torque 1
eccentric contraction
Resistence torque is greater than muscle torque 2
muscle is legthened while trying to shorten
resistence torque is greater than muscle torque 3
resistance torque wins! -muscle acts as a brake to slow or control mvement
If the amount of energy used is the same 1
eccentric: GREATEST FORCE PRODUCED -resistance is doing work -oxogen use lowered
if the amount of energy used is the same 2
Isometric: energy is not used for shortening
if the amount of energy used is the same 3
Concentric: least efficent- least force produced -energy used shortening -not available for producing tension
isotonic tension means
equal tension
Isotonic tension muscle would-
produce the same amount of tension throughout ROM
Isotonic tension-
because of body lever systems, muscles rarely function isotonically
class of levers 3- first class
Fulcrum between effort and resistance
second class
resistance btw effort and fulcrum - favors force -move large resistance with less effort
second class 2
effort ma always longer than resistance ma
third class
favors speed and range -effort moves through distance and at a slower speed than resistance
third class 2
effort moves through less distance and at slower speed than resistance MA - force disadvantage
Advantages of first class levers 1
determined by length of moment arms
Advantages of first class levers 2
Effort MA longer =favors force
Advantages of first class levers 3
effort MA shorter = favors speed and range
Human body levers
most are third class levers -no 2nd class levers in body
Human body levers 2
few first class levers with speed and range advantage -human body levers have a huge force disadvantage