Artikel voluntary activation does not represent relative voluntary torque

5 important questions on Artikel voluntary activation does not represent relative voluntary torque

What happens with the EMG signal when, at almost maximum torque, the torque increased a little bit.

The EMG increases a whole lot because of the stimulation - Force relationship

What is assumed when using the 'twitch interpolation technique'?

Stimulated force increments decrease linearly as voluntary force increases (topping off)

How is maximal voluntary activation generally quantified?

By expressing the increment in 'twitch force' on a MVC as a percentage of resting twitch force. Subtract the increment percentage from the 100% and you have the VA.
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This article about the MVC and VA has a some limitations, which ones?

  • The assumption that VA = MVC - supertwitch/resttwitch
  • synergistic muscle activity?
  • MVC is ALWAYS different

How can the non-linear part of the superimposed vs torque be explained?

High intra-cellular Ca2+
Electrode displacement
high level of motorneurons already in use and in their refractory period
antagonistic activity

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