Accelerometer Reflex

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In order to accurately measure reflexes for the three stimuli, both time of the stimulus and time of reflex need to be recorded so that the time elapsed between the two times can be measured. To accomplish this, an accelerometer needs to be attached to a reflex hammer through use of a cable tie. The subject needs to begin sitting comfortably in a chair that is high enough to allow his/her legs to dangle and move freely above the floor. Two electrode tabs should be attached above one knee along the line of the quadriceps muscle between the knee and the hip. The tabs should be 5 and 13 cm away from the middle of the patella. A third electrode tab should be placed on the lower leg below the patella. Finally, red and green leads should be attached to the electrode tabs above the knee, with the red lead attached to the lab closest to the knee. A black lead should be hooked up to the electrode on the lower leg. The EKG Sensor and …show more content…

Click “collect” on the interface and then record at least 5 seconds of a stable baseline. Then, quickly swing the reflex hammer to contact a hard surface in order to generate an audio stimulus. The subject should kick his/her leg out immediately upon hearing the noise of the hammer. Reflexes should be continued to be obtained until at least 5 measurable kicks have been recorded. Click the “examine” button and place the cursor on the acceleration graph. Align the examine line with the first high peak in the acceleration graph, and record this number as the time at which the audio cue occured. Move the cursor to the EMG graph and align it with the “examine” line. Record this number as the time at which the quadriceps muscle contracted. Record times for the remaining cues and muscle contractions. An average change in time for all five pairs should be calculated. The entire process should repeated and recorded for all subjects in the

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