Physiolab 9 0 exercise 10

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Physiolab 9 0 exercise 10

Describe the effect of increasing stimulus voltage on isolated skeletal muscle. Specifically, what happened to the muscle force generated with stronger electrical stimulations and why did this change occur?

Physiolab 9 0 exercise 10

How well did the results compare with your prediction? Each time the voltage was increased the force generated from the muscle also increased. This occurs because as the voltage increases, Physiolab 9 0 exercise 10 is delivered to the whole muscle 2.

How is this change in whole-muscle force achieved in vivo? The increase of electrical current causes a progressive increase in the amount of muscle force based on the amount of the electrical current.

What happened in the isolated skeletal muscle when the maximal voltage was applied? All of the muscle fibers in the isolated skeletal muscle became depolarized and all developed active force. What is the difference between stimulus intensity and stimulus frequency? Stimulus intensity describes the amount of force generated to administer the stimulus and stimulus frequency refers to the rate of delivered stimulus to the muscle.

In this experiment you observed the effect of stimulating the isolated skeletal muscle multiple times in a short period with complete relaxation between the stimuli.

Describe the force of contraction with each subsequent stimulus. Are these results called treppe or wave summation?

When stimulating the isolated skeletal muscle multiple times in a short period with complete relaxation between each stimuli the amount of force between each stimulus increased progressively in step like form to a maximum peak in which a plateau of the force occurred.

This is known as treppe. How did the frequency of stimulation affect the amount of force generated by the isolated skeletal muscle when the frequency of stimulation was increased such that the muscle twitches did not fully relax between subsequent stimuli?

When the stimulation frequency was increased to the point in which muscle relaxation did not occur the amount of force progressively increased with each stimulus. When muscle twitches overlap, no muscles relax, and stimuli occurs one after another in a short amount of time, the muscle contraction is higher than if a single stand alone contraction had occurred 4.

To achieve an active force of 5. If not, how did you achieve an active force of 5. No, I did not have to increase the stimulus voltage above 8. In order to achieve an active force of 5. Compare and contrast frequency-dependent wave summation with motor unit recruitment previously observed by increasing the stimulus voltage.

How are they similar? How was each achieved in the experiment? Explain how each is achieved in vivo. Describe how increasing the stimulus frequency affected the force developed by the isolated whole skeletal muscle in this activity.

Indicate what type of force was developed by the isolated skeletal muscle in this activity at the following stimulus frequencies: Beyond what stimulus frequency is there no further increase in the peak force?

What is the muscle tension called at this frequency? When a skeletal muscle fatigues, what happens to the contractile force over time? When a skeletal muscle fatigues the contractile force declines due to previous contractile activity. Once the muscle has reached maximum tetanic tension, there is no longer an increase in force generated by the muscle.

At this stage, the muscle becomes fatigued and contractile force starts to decrease over time. What are some proposed causes of skeletal muscle fatigue?

The buildup of lactic acid, ADP, and Pi in the muscle fibers.

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One other reason comes from Calcium levels decreasing from muscle contractions. Turning the stimulator off allows a small measure of muscle recovery. Thus, the muscle will produce more force for a longer time period if the stimulator is briefly turned off than if the stimuli were allowed to continue without interruption.

Explain why this might occur. With these concentrations being at a decreased level, the length of time that the muscle is able to maintain maximum tension increases.

If the stimulator was not turned off for a short time, the muscle would not be allowed to reach a rest period and further fatigue would continue.We sense and control to °C and +/- 10 mmHg every second.

Contrast • Aiding recovery after exercise The application of pressure, warming and cooling is commonly used but never with 8 PHYSIOLAB ® PERFORM - RECOVER - REPAIR 9. RESEARCH & DEVELOPMENT 1, OVER WATTS OF POWER PER UNIT OF RESEARCH & DEVELOPMENT EXPENDITURE.

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A, time course of force (T/T 0, upper trace) and hs length change (L, lower trace) in response to a ramp‐faced shortening at V 0 (amplitude ∼10% of the initial fibre length, plus a % step release) applied at T 0. Time 0 corresponds to the start of shortening. Sign in now to see your channels and recommendations!

Sign in. Watch Queue Queue. During a six-a-side game on a small pitch without coach encouragement, exercise intensity was 84 ± 5% of maximal heart rate, blood lactate concentration was ± mmol · l −1, and the RPE was ACS Editors' Choice - This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.

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