Page 12 Bs Biopac Student Lab 3.7.7 ELECTROMYOGRAPHYI Na La Standard and Integra
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Page 12 Bs Biopac Student Lab 3.7.7 ELECTROMYOGRAPHYI Na La Standard and Integrated EMG DATA REPORT Student's Name: Lab Section: Date: RE I Data and Calculations Subject Profile Height 162G Gender: Male Female Age 25 / Left A. EMG Measurements Cluster # Note: "Clusters" are the EMG bursts associated with each clench B. Use the mean measurement from the table above to compute the percentage increase in EMG activity recorded between the weakest clench and the strongest clench of Forearm 1 Calculation: o. 2116-0.06 Answer: 29 % C. Tonus Measurements Dominant arm Non-dominant arm Between Clusters # 12 0.032 mIs .034 /s 2-3 3-4Explanation / Answer
H. Motor Unit recruitment - It refers to the activation of the additional motor unit to increase contractor strength of the muscle.
Motor unit comprises of the anterior horn cell (AHC), axon ,neuromuscular junction, and muscle ffibre.When more motor neurons are activated more muscle fibres are activated and strong contraction occurs. Recruitment occurs from smallest motor neuron to the largest one .. followed by smallest to larger twtwitch.This is also known as Henneman's Size Principle.
I. Skeletal Muscle Tonus- Defined as the continuos and partial contraction of the muscle with certain degree of vigour and tension .
In skeletal muscle, time is neurogenic due to continuous discharge of imof imimpulses from gamma motor neuron from the anterior Gray horn of spinal cord. Gamma motor neurons are controlled by the higher centers of the brain.
J. Electromyography- It is tge study of motor unit activity. Involves detecting,amplifying and displaying the electrical changes that occur when a muscle contracts. It provides tool for assessing neuromuscular system. Input phase includes electrodes to pick up electrical potentials from contracting muscles, processor phase where small electrical signal is amplified and output phase where electrical signal is converted into visual and auditory signals .
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