exercise 2 skeletal muscle physiology activity 3 the effect of stimulus frequency on skeletal muscle contraction
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Universiteit Antwerpen (UA)
Farmaceutische Wetenschappen
Inleiding Fysiologie En Functionele Anatomie I (1008FBDFAR)
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26-5-2021 PhysioEx Exercise 2 Activity 3
PhysioEx Lab Report
Exercise 2: Skeletal Muscle Physiology
Activity 3: The Effect of Stimulus Frequency on Skeletal Muscle Contraction
Name:
Date:
Session ID:
Pre-lab Quiz Results
You scored 100% by answering 4 out of 4 questions correctly.
1 During a single twitch of a skeletal muscle
You correctly answered: maximal force is never achieved.
2 When a skeletal muscle is repetitively stimulated, twitches can overlap each other and result in a
stronger muscle contraction than a stand-alone twitch. This phenomenon is known as
You correctly answered: wave summation.
3 Wave summation is achieved by
You correctly answered: increasing the stimulus frequency (the rate of stimulus delivery to the
muscle).
4 Wave summation increases the force produced in the muscle. Another way to increase the force
produced by a muscle is to
You correctly answered: increase the number of activated motor units.
Experiment Results
Predict Questions
1 Predict Question 1: As the stimulus frequency increases, what will happen to the muscle force
generated with each successive stimulus? Will there be a limit to this response?
Your answer: As the stimulus frequency increases, the muscle force generated by each successive
stimulus will increase. There will be a limit to this increase.
2 Predict Question 2: In order to produce sustained muscle contractions with an active force value of
5.2, do you think you will need to increase the stimulus voltage?
Your answer: Yes.
Stop & Think Questions
1 Was there any change in the force generated by the muscle during the second stimulated twitch?
You correctly answered: Yes, the second twitch generated more muscle force.
2 Is the total muscle force generated by the higher frequency stimulation greater than the force
generated in previous stimulations?
You correctly answered: Yes, it is greater than the previous stimulations.
3 Does the force generated by the muscle change with each additional stimulus?
You correctly answered: As the stimulus frequency increased, the muscle tension generated by each
successive stimulus also increased, and a limiting maximum value was observed.
Experiment Data
Voltage (v) Length (mm) Stimulus Active Force Passive Force Total Force
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