Muscle Laboratory nicole, cesar, josh

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School

Fullerton College *

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Course

310L

Subject

Mechanical Engineering

Date

Dec 6, 2023

Type

pdf

Pages

4

Uploaded by BaronPorpoisePerson925

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Report Lesson Muscle Laboratory Electromyography – Challenge Grip force – Calibration Muscle fatigue – Analysis 20 10 20 10 20 Eyes open Eyes open 100 100 Eyes closed Eyes closed Verbal encouragement Brief periods of rest Visual feedback Grip Force (%) Verbal encouragement Brief periods of rest Visual feedback 8000 6000 4000 2000 0 -2000 -4000 -6000 -8000 -10000
Visual feedback – Analysis Time (s) E±ort 25% E±ort 50% E±ort 75% E±ort 100% 1 -1470.99 -1181.33 -1318.74 -386.86 5 -1458.36 -1100.54 -846.34 -517.36 10 -1501.11 -1152.82 -959.04 -746.85 20 -1416.61 -1251.89 -1065.25 -643.02 Complete the graph by labeling the title and axes. Grip Force vs. Strength Time (s) E±ort 25% E±ort 50% E±ort 75% E±ort 100% 0 2 4 6 8 10 12 14 16 18 20 -2000 -1500 -1000 -500 0 Did this experiment help you decide which of the factors proposed to explain fatigue are important? This experiment helps in seeing that the strength being applied can explain fatigue as the grip force begins to decrease over time. Grip Force (%) Visual feedback -1345.03 Without visual feedback -1422.85 Grip Force
Summary Popup - Re²ection notebook Complete the graph by labeling the title and axes. Grip Force vs. Feedback Feedback Visual feedback Without visual feedback -1500 -1000 -500 0 Examine the data recorded when the volunteer attempted to maintain a 50% contraction with their eyes shut. Almost all volunteers will show a declining force (pseudo-fatigue) while their eyes are shut that is very similar to actual fatigue. This is not true fatigue because the full 50% force can be exerted easily, as can be seen when the volunteer's eyes are opened again. What explanations can you think of for pseudo-fatigue? With the volunteer's eyes closed, they are not able to see the data, which does not give them the visual encouragement needed to maintain the same amount of force being applied when their eyes were open. From your experience testing each of the factors in the lab today, do you need to reform your hypothesis? If so how? After the lab, brief periods of rest can be considered to have the most fatigue on the volunteer because the time of rest vs. the time of force being applied are almost the same. This does not allow the muscles to fully rest before the next attempt and can further fatigue the muscles in the next attempt. Grip Force
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Re±ection Notebook: