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PhysioEx2Activity3

The effect of stimulus frequency on muscle contraction

QuestionAnswer
What is Treppe? The progressive increase in force generated when a muscle is stimulated in succession , such that muscle twitches follow one another closely, with each successive twitch peaking slightly higher than the one before
Under what conditions can treppe occur? (2) For the first few twitches, each successive force produces slightly more force than the previous twitch as long as the muscle is allowed to fully relax b/w stimuli & the stimuli are delivered relatively closer together.
What happens when a muscle first contracts? The force it is able to produce is less than the force it is able to produce with subsequent stimulations within a relatively short time span.
What is treppe also known as? The stair-case effect
What is wave summation? When a muscle is stimulated repeatedly such that stimuli arrive after one another in a short period of time, Muscle twitches can overlap with each other & result in a stronger muscle contraction than a stand alone twitch
When does wave summation occur? When muscle fibbers that are developing tension are stimulated again before the fibbers are relaxed. Thus wave summation is achieved by increasing stimulating frequency or rate of stimulus delivery to the muscle
During a single twitch of a skeletal muscle what happens to maximal force? It is never achieved
What is the difference b/w stimulus intensity & stimulus frequency? Stimulus intensity describes the amount of force generated to administer the stimulus.The more force that is used will increase the stimulus intensity.Stimulus frequency refers to the rate of delivered stimulus to the muscle.
Describe the force of contraction with each subsequent stimulus. Are these resultscalled treppe or wave summation? When stimulating the isolated skeletal muscle multiple times in a short period with complete relaxation between each stimulithe amount of force between each stimulus increased slightly evertime in step like form to a max peak. This is known asTreppe
To achieve an active force of 5.2 g, did you have to increase the stimulus voltage above 8.5 volts? I didn't have to increase the stimulus voltage above 8.5 volts.
If not, how did youachieve an active force of 5.2 g? In order to achieve an active force of 5.2g the stimulineeded to be delivered in rapid succession in a short amount of time and not allowing for full relaxation of the muscle. Inorder to get 5.2g of active force, wave summation needed to occur
Compare and contrast frequency-dependent wave summation with motor unit recruitment (previously observed by increasing the stimulus voltage). Frequency-dependent wave summation is dependent upon stimulation by the nervous system. The motor recruitment tdepends upon the number of motor fibers available.
Created by: meunid
 

 



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