Question

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sEMG Amplitudes and Frequencies at Rest and During Isometric Contractions Under Different Loads Amplitude (mv) 1.5 1.2 0.9 0.6 0.3 10 20 bs Rest o Frequency (spikes number per 0 2 sec time period 25 20 15 10 1020 bs Rest 0 5. Describe how amplitude of sEMG spikes changed with increasing muscle load 6 Describe how frequency of sEMG spikes changed with increasing muscle load 7. Based on changes in amplitude and frequency of sEMG, did motor unit activation increase, decrease, or stay the same with increasing muscle load? 03 Rest 0 10 20 bs Frequency (spikes number per 0.2 sec time period) 25 20 15 10 Resto 020 bs 5. Describe how amplitude of sEMG spikes changed with increasing muscle load 6. Describe how frequency of sEMG spikes changed with increasing muscle load 7. Based on changes in amplitude and frequency of sEMG, did motor unit activation increase, decrease, or stay the same vwith increasing muscle load? 8. Do you think that the force of isometric contraction increased, decreased, or stayed the same as muscle load increased? 9. Which would be a better predictor of increase in force of contraction, change in sEMG amplitude of spikes or change in sEMG frequency of spikes?

Answer 1

5. The amplitude of EMG spikes increase with increase in load

6. The frequency of EMG increases upto a load of 5 lb and then reduces and plateaus at 20 lb

7.with increasing muscle load the motor units activity increases

8.The force of isometric contraction increases with increase in muscle load

9. Change in amplitude of spikes is a better measure of force of contraction

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