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UMass Amherst KIN 460 - Motor Unit Recruitment 9.12.2014

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Lesson 2- EMG II Motor Unit Recruitment and Properties Introduction: In 1957 power lifter Paul Anderson set the world record for the heaviest weight ever lifted by a human being, at a total of 6,270 lbs. According to the Guinness Book of World records no one has yet been able to best his record.1 How was Anderson able to lift such a massive weight? In this lab we will learn about the different muscular properties and the mechanisms of motor recruitment which would allow such a feat to occur. Setup 1. Set up each workstation accordingly. Make sure you have: a. Computer with Biopac MP3X unit b. Hand dynamometer c. EMG electrode lead set d. Three disposable vinyl electrodes e. Conductive gel 2. Attach the electrodes to the forearm. The black lead (ground) should be on radial styloid, the red lead (positive) should be just proximal to the radial styloid, and the white lead (negative) should be on the flexor carpi radialis muscle. 3. Start the Biopac program and load the lesson “L02”- it is Lesson 2, titled EMG II. 4. Type in your student ID number. Calibration 5. Click ‘calibrate’, set dynamometer down and click OK.6. After baseline calibration has been completed, you will need to get a calibration for the maximum force you can produce. When prompted, grip the dynamometer as hard as you can for at least two seconds. Data Recording We are going to look at your EMG activity during different levels of muscular contraction. The levels of contraction are: 50% and 100% of maximal grip force. 7. Click ‘record’, and perform clench-release cycles as listed below for 2 seconds each. Release, 25% of max, release, 50% of max, release, 75% of max, release, 100% of max Relase, then clench as hard as possible (100% of max) and try to hold this as long as possible 8. When finished, click ‘suspend’. 9. Review the data on the screen by using the various tools available. Data Extraction 10. Click on “Analyze Data” 11. Click on the I-Beam cursor button and highlight your entire data set. 12. Click on “Edit”, then “Data Window”, then “Copy Wave” 13. Go to the bottom section and paste the data (use Control+V) 14. Click on the “Save” icon, and save the data to the KIN 460 folder labeled as your student ID. Data Analysis and Writeup 1. For this writeup you will be turning in two graphs. Both graphs should be scatterplots with lines and no dots and should report both the table and moodle data. a. Graph 1: Integrated EMG activity (volts) vs. Time (s) b. Graph 2: Clench Force (n) vs. Time (s) c. Both graphs should have Time on the x-axis, and Emg/Force on the y-axis, with labels listing which line was table vs. moodle data. 2. How did your table data compare to the moodle data for the EMG and Force data? times? If the results differ, give a couple reasons why these differences may have occurred. 3. What is the Henneman size principle? Name 2 other neural factors which contribute to muscular force production. 1.) June 12, 1957 – Weightlifter Paul Anderson Sets World Backlift Record. Archives 1957.


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UMass Amherst KIN 460 - Motor Unit Recruitment 9.12.2014

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