KP351 Lecture Notes - Lecture 6: Motor Unit, Muscle Spindle, Soleus Muscle
20 Mar 2020
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Threshold (%mvc, %peak, number of ad, %quiet period) Active burst needs to be a certain time and above a certain threshold to be considered a burst. Can provide ring rate (discharge rate) and recruiting pattern. Record emg signal during activity (baseline and fatigue situation) Fatigue is indicated by shift to lower frequencies. Motor units are recorded from slow to fast. Recovery in the muscle is not always shown in a frequency magnitude graph. This relationship has been extensively evaluated under isometric contractions. Relationship between emg amplitude and force output is generally linear. Incremental changes in muscle force are linearly related to amplitude. Presumed to be a combination of: rapid elbow extension. Emg amplitude during the rst 100 ms of the movement are directly related to kinematic changed (peak velocity and acceleration: cycling. Emg amplitude-force relationship = linear in soleus and non-linear in gastroc. Not all muscle - force relationships are linear. Type of muscular contraction (isometric vs dynamic)
