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. does the amplitude of the emg signal and the force of contraction, as measured by the absolute integrals, increase because a finite number of fibers are firing more often, or because more fibers are recruited to fire as the intensity of signals in the motor neurons increases, or a combination of these two?

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Both factors are combined in it.

Additional motor units are enlisted to maintain a constant muscle force and flexor joint torque to maintain the isometric position as muscle fibers tire and produce less force. As a result, as the muscle ages, the EMG magnitude grows.

Why does EMG activity increase as the force generated increases?

  • Additional motor units are enlisted to maintain a constant muscle force and flexor joint torque to maintain the isometric position as muscle fibers tire and produce less force. As a result, as the muscle ages, the EMG magnitude grows.
  • The muscle's electrical activity is directly inversely correlated with the force of a contraction. The force of contraction grows as action potential frequency grows. Summation, which can result in the creation of maximal tension (complete tetanus) with no relaxation time, can happen when stimuli occur more closely together.
  • Additionally, the number of muscle motor units that are activated during a contraction affects how strong the contraction is. Adding more motor units will increase the force of contraction.

To learn more about : EMG magnitude

Ref : https://brainly.com/question/22710888

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