Contingency Management of Physical Rehabilitation: The Role of Feedback Page: 7
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this session we are going to focus on the muscle amplitude of this muscle.
The FlexDotTM was then connected to the strap which went around the knee and oriented
so that the FlexDotTM rested along the teardrop of the VMO. The battery opening of the
FlexDotTM points toward the midline of the leg (Figure 6).
Sometimes it is difficult to figure out how to flex this specific muscle, this is a
particularly common hurdle for patients who have recently gone through total knee
replacement surgery as they often lose some proprioceptive feedback. To address this
difficulty, I am going to start by teaching you to flex this muscle. At first, you are going
to hear a tone if you just barely flex the muscle. This requirement will gradual increase
until you are efficiently and effectively engaging the VMO. After you have learned how
to flex the VMO, we are going to determine your maximum contraction. We will do this
by having you flex 12 times across 3 different conditions. In one condition, you will
receive no feedback other than my instruction to flex as hard as you can. In another
condition, you will hear a tone every time you meet your goal, and in the final condition
you will be playing a game. I will let you know which condition you are in prior to the
start of that condition. While you are in the condition, the requirement for feedback (such
as a tone will change, sometimes a very little flex will produce a tone and at other times
you will have to flex very hard to produce the tone).
Conditions
The study consisted of two phases: initial training and MVIC testing. The MVIC testing
occurred across three conditions (described in detail below): (i) instruction only, (ii) instruction +
feedback, and (iii) instruction + feedback in a gaming context.
Initial Training
This part served as an initial training condition to ensure that all participants could
efficiently and effectively engage the VMO prior to the beginning of the experiment proper. The
purpose of this was to avoid potential difficulties in interpreting the data from the testing
condition. Once the device was in place, the participant sat in a chair positioning their legs at a
90 degree angle. During training, the criterion for initial feedback (a ding) was set at a value of7
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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/m1/13/?rotate=270: accessed July 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .