The larger value of the two MVCs was used to measure grip endurance, at 50% MVC,
Can some one suggest papers or book that explain how to conduct and acquire data with 50% MVC. most papers say experiments were conducted at 25% 50% 75% MVC, I would like to understand better how experiments were conducted at that levels. Thank you
They showed that during three different isometric protocols at different percentages of the maximal voluntary contraction (MVC), the relations between the amplitude and force were different depending on the fatigue protocol of the given study. how to have different % to measure
I worked on this topic for several years at Professor Merletti's Laboratory, in Turin, Italy.
Instrumented ergometers or torque meters are used during MVC contractions to assess the maxim torque level at the investigated joint. You can have a look at this website to see examples of devices used in Turin. http://www.otbioelettronica.it/index.php?option=com_content&view=article&id=36&Itemid=266&lang=en (Discolsure: I have no commercial interests)
The maximum torque value is stored and used to set the full scale amplitude of a biofeedback. This is the 100%MVC level.
A target level is set on the biofeedback device, e.g. at 25%MVC
Next, a visual feedback based on the ergometer output is provided by a led bar or by a bar on a laptop screen, along with the target value (e.g. 25% MVC), during the EMG acquisition of fatiguing muscle contractions. Typically, the torque level is acquired too.
Force meters like those on this page are used http://www.otbioelettronica.it/index.php?option=com_content&view=article&id=18&Itemid=262&lang=en
I hope it helps!
Andrea Merlo
http://www.merlobioengineering.com
Usually you are taking the maximum contraction value before hand and the defined the 100% value. Then, you can measure 75%, 50% or 25%. Visual feedback may be required for the testing.
As Ram stated, it is necessary to begin with a MVIC. Then you can use any combination of custom software, dynamometer software, or just an oscilloscope line to provide a target equivalent to your desired intensity with which the research participant should achieve. Be cautious not to provide too much feedback (scaling of feedback), as it may lead to excessive adjustments (see Carlton and Newell). Pilot work is likely needed to determine the best amount of feedback for the task and population.
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