Part 3 - Questions 1. If we recorded muscle activity (EMG) during fatiguing exercises, what would we expect to see during submaximal and maximal muscle contractions? Using the muscle recruitment principles explain why the muscle activity would be different between submaximal and maximal muscle contractions.
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Step 1: During fatiguing exercises, we would expect to see a decrease in EMG amplitude during both submaximal and maximal muscle contractions. Show more…
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Adi S.
Is there a linear relationship between EMG intensity and the force produced during voluntary contraction of the biceps muscle (indicated by the weight being supported)? How does the amplitude and duration of the EMG signal and of muscle contraction relate to the number of motor units recruited, and to the number of times each unit is stimulated? Does the type of muscle fiber recruited change with contraction force? What are the physiological mechanisms underlying the phenomenon of coactivation? What are the mechanisms of muscle fatigue and how does it explain the differing magnitudes of fatigue at different levels of grip force?
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1. When holding an object, does the number of motor units remain the same? Are the same motor units used for the duration of holding the object? 2. During fatigue, does the EMG follow the same pattern as force of contraction? Explain. 3. At a common force (meaning they are both squeezing the exact same force in kg), which hand had a higher EMG (electrical reading), and why?
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