ch18 Flashcards
force developed when a contracting muscle acts on an object
tension
force exerted on the muscle by the object
load
initiation of the tension producing process of the myofibrils
contraction
capability of a force or tension to produce rotation of a limb around a joint
torque
muscle fiber contraction in which the tension generated by the muscle fiber is constant thru the range of motion[not able to exert same force]
isotonic conraction
force varies as muscle shortens thru ROM
dynamic contraction
ontraction produces tension during shotening- acceleration
concentric
tension produced while lengthening with greater force production to make more crossbridges /deceleration such as running down hill
eccentric
velocity of contraction is constant where reisstance is variable to individual and length of motion
isokinetic
contraction occurs withotu change in the length of muscle fibers
isometric
increase in muscle tension without movement of skeleton
static
neural factors include frequency of stimuli and recruitment also known as
rate coding and number coding
rate coding=
increased frequency=increased force
number of motor units activated is recruitment aka
number coding
power and velocity are directly positive related
FT fibers vs ST fibers
fast twitch generates more ___
power
the shortening velocity of a muscle increases as the force developed by the muscle decreases, which means that a muscle can shorten fastest when the load is the lightest
power and velocity relationship
tension is related to length of sarcomeres -degree of overlap, number of crossbridges
length-tension-angle
velocity of shortening is ___ related betwen force and speed
inversely
suggests that fatigue results from decrease in certain metabolites, like ATP, phosphocreatine, and glycogen bc muscle fibers are no longer able to produce force
depletion model
suggests that fatigue is caused by the accumulation of certain metabolites that are known to impair force generation within muscles like lactate, hydrogen ions, ammonia, and phosphate
accumulation model
