Muscles twitches Flashcards
what are the phases of a twitch
latent , contraction, relaxation
what are the 2 variation of tension produced by muscle fibers
treppe
and
wave summation
treppe def
increased strength and tension if muscle is warmed up
wave summation def
increased strength and tension due to adding twitches together
what is treppe basicallay
repeated stimulations immediately after relaxation
what does treppe cause
a series of contractions with increasing tension
when does treppe reach max
after 30 to 50 twitches
what is the max of treppe roughly
about 2 times the strength of the first twitchs
why do we warm up b4 excercising vigorously
so that ca conc doesnt drop back to starting remains
to increase temp to increase enzyme activity to increase rate of chem rxns
what is temporal summation basically
repeated stimulations prior to end of relaxation phase
what does temporal summation do to contractions
causess a series of contractions with increasing tnesion
what is tetanus
when twitches reach maximum tension
what are the 2 types of tetanus
incomplete and complete
is complete tetanus common or uncommon
uncommon because muscles fatigue quickly
what is spatial summation
variation of tension in entire skeletal muslce
what are the 2 parts of spatial summation
recruitment and motor unit
what is a motor unit
a single neuron and all muslce fibers that it innervaties
how is muslce activitiy mantined
by rotating motor unites used
how do you achieve increased muslce tension
by warming up muscle, increasing stimulus frequency, or increasing stimulus strength
what has to do with warming a muscle up
treppe
what has to do with increaseing sitmulus frequency
temporal summation and tetanus
what has to do with stimulus strength
recruitment and spatial summation
what does max tension require
recruitment of all motor units and maintained for only short time
what does sustained tension allow for
motor units to rest in rotation
