Laboratory Report - Recruitment and Isotonic and Isometric Contractions

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LABORATORY REPORT Activity: Recruitment and Isotonic and Isometric Contractions Predictions When the arm goes from resting to flexing, the amplitude and frequency of sEMG spikes will During flexion, the amplitude and frequency of sEMG spikes will ___ during extension. Recruitment of motor units will be greatest when the load is Materials and Methods Comparison of motor unit activation during muscle tone and concentric and eccentric isotonic contractions Dependent Variable Independent Variable Controlled Variables Recruitment during isometric contractions Dependent Variable Independent Variable Controlled Variables 4. What does the acronym sEMG stand for? 5. During a muscle contraction, what is recorded on a sEMG? 6. Spike numbers were measured during a ____msec period. Results Table 3. Muscle Tone (Resting) and Isotonic Contractions increase not change 20 pounds amplitude and frequency of sEMG spikes muscle movement total number of motor units present in muscle, muscle load, subject's physical condition amplitude and frequency of sEMG spikes muscle load total number of motor units present in muscle, muscle movement, subject's physical condition Surface Electromyography Response/electrical impulse .2 Amplitude (mV) Spike Numbers (per 0.2 sec time period) Rest Concentric Eccentric Rest Concentric Eccentric Subject 1 0.12 0.41 0.35 1 20 20 Subject 2 0.10 0.48 0.33 1 20 20 Subject 3 0.12 0.46 0.32 1 19 20 Laboratory Report/ Chloe Canon/ Recruitment and Isotonic and Isometric Contractions/ Tammy Coleman-Card/ 07.19.2015/ Page [1] of [4] Amplitude (mV) Spike Numbers (per 0.2 sec time period) Rest Concentric Eccentric Rest Concentric Eccentric average 0.11 0.33 0.11 1 20

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