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EMG lasts only for a short period of time while comparatively force contraction lasts longer.
Electromyography (EMG) is a technique for measuring muscle response or electrical activity in response to nerve stimulation of your muscle. The test is used to aid in the diagnosis of nerve and muscle problems.
Force of contraction occurs when tension-generating sites within muscle cells are activated.
Muscle force and smoothed rectified EMG typically have a linear relationship during static isometric contractions (SRE). However, it should be remembered that many muscles are typically contracting at once near a joint. This suggests that there is no requirement for a linear relationship between the SRE of a single muscle and the total joint moment.
Additionally, EMGS during concentric movements is greater than EMGS during isometric movements. The force signal's much lower frequency content than the rectified EMG is another factor to take into account when relating force to EMG.
Finally, the slow rate of activation and deactivation results in a 50 to 200 ms delay in muscle force relative to EMG.
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