Contingency Management of Physical Rehabilitation: The Role of Feedback Page: 6
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activity per second. The arrangement and management of all contingencies was relative to the
average amplitude values described.
Procedures
All participants wore shorts or other athletic apparel. Prior to the start of any testing or
experimental manipulations each participant learned to flex the VMO. This helped ensure
relative similarity across participants in regard to their history of VMO flexion. After
establishing a history of VMO flexion the experimenter began testing for the peak amplitude
produced during an individual's contraction of the VMO. The study included 3 conditions
(instruction only, instruction + feedback (auditory tone), and instruction + feedback in a game
context). The results from these conditions provide information regarding the conditions under
which an individual may produce the greatest MVIC value.
Initial Instruction and Set Up
The experimenter described the entirety of the study to the participant during the
beginning of the session. During the description process the experimenter fitted the participant
with the sEMG device. The purpose of this was to ensure that the experimental conditions
resembled potential clinical conditions as closely as possible.
This small sEMG device will allow me to measure how much you are flexing your
quadricep. I am going to place this device on your knee. Please extend your leg and flex
your quadricep now.
At this time the experimenter pointed to the vastus medialis oblique (VMO) located
approximately 2 finger widths above the knee cap just left of center (Figure 5).
This teardrop shaped outline is your vastus medialis oblique. It is the primary muscle
physical therapists target following total knee replacement surgery. For the remainder of6
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Armshaw, Brennan P. Contingency Management of Physical Rehabilitation: The Role of Feedback, thesis, December 2018; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc1404528/m1/12/: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .