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Question

Pane Office Update To keep up-to-date with security updates, fixes, and improvements, choose Check for Updates. Check for Upd Data Report D. Questions and Write-up: 1. Compare the mean measurement for Forearm 1 (dominant) and Forearm 2 maximum clench EMG cluster. Are they the same or different? Which suggests the greater clench strength: Forearm 1 (dominant), Forearm 2, or neither? Explain. (2pt) 2. Does there appear to be any differences in resting tonus between the 2 forearm muscles? Would you expect to see a difference due to dominance? Explain. (2pt) 3. Explain the source of the signals detected by the EMG electrodes. (2pt) 4. Explain "motor unit recruitment." (1pt) 6. Describe the relationship of resting tonus and clench strength to electromyography. 2pt)

Explanation / Answer

Here, according to the observation and data analysis report you have created, write the the mean measurement of the forearm 1 and forearm 2 maximum clench EMG cluster. For the calculation of mean measurement, Forearm 1 = the difference between the strongest clench and the weakest clench. Forearm 2 = the difference between the strongest cleench and the weakest one. Generally on the comparison you will find, they are different. Forearm 2 will suggest the greater clench. This is because the non-dominant arm will have a greater muscular force than the dominant arm. The non dominant arm might be used much as compared to the dominant ones. (All these things will depend upon the data report you might have made; these are some general things). Yes, there appears to be a difference between the resting tonus between the 2 forearm muscles. Yes, I would expect this difference is due to its dominance. The dominant arm is the one we frequently work with. Its frequent usuage and exercise makes it more powerful and hence it is able to clench strongly. So, the tonuses produced should be stronger. While the non-dominant hand is the one with which one does not work frequently with. So the clenches will not be that powerful as compared to that of dominant ones and hence tonus will be lower. The source of signals detected by EMG electrodes is from the muscle contraction. The muscle membrane has a potential of about -90mV. Depending on the type of muscle under observation, the measurements of electric potential range between less than 50 micronV and upto 20-30mV. EMG easily detects the potential generated by these muscle cells when they are neurologically actiavated. Motor unit is a combination single motor neuron and all the muscle fibre it innervates(controls). However, each muscle fibre is controlled by a single motor neuron. When a motor unit is activated, the impulse is carried down to the muscle fiber through the motor neuron. Sometimes, the muscle needs some more strength to perform a task which could not be carried out by the given motor neurons. Hence, the brain increases the simultaneously active motor neurons within the muscle. This process is known as "motor unit recruitment".

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