67%(3)2 out of 3 people found this document helpful
This preview shows page 4 - 5 out of 10 pages.
10.Locate the subject’s patellar tendon by feeling for the narrow band oftissue that connects the lower aspect of the patella to the tibia. Place a penmark in the center of the tendon, which can be identified by its softnesscompared with the bones above and below (see Figure 6). 11.Start data collection. If your graph has a stable baseline as shown inFigure 4, stop data collection and continue to Step 12. If your graph has anunstable baseline, stop and collection and repeat data collection until youhave obtained a stable baseline for 5 s. 12.Collect patellar reflex data. Note: Read the entire step before collectingdata to familiarize yourself with the procedure. a.Have the subject close his/her eyes, or avert them from the screen. b.Start data collection.c.After recording 5 s of stable baseline, swing the reflex hammer brisklyto contact the mark on the subject’s tendon. If this does not result in a visible reflex, aim toward other areas of the tendon until the reflex is obtained.d.Continue obtaining reflexes so that you record 5–10 reflexes during the collection period. 13.Determine the time elapsed between striking the patellar tendon with the reflex hammer and the contraction of the quadriceps muscle.a.To analyze the data, tap and drag across the EKG data to highlight the area from just before the tendon was struck to just after the muscle contraction.b.Choose Zoom In from the Graph menu.c.Tap the first high peak (which corresponds to the first kick) in the Accelerometer graph (Figure 5). This peak indicates the time at which the tendon was struck. Record this time in Table 2. d.Tap the first high peak (Kick 1) in the EMG graph. This peak indicates the time at which the quadriceps muscle contracted. Record this time in Table 2.e.Choose Autoscale Once from the Graph menu.f.Repeat this process of zooming in and determining the time of the hammer strike and reflex for a total of five stimulus-kick pairs.g.Calculate the change in time between the hammer strike and reflex for the five stimulus-kick pairs and then calculate the average change in time for all five pairs. Record the values in Table 2.Part III Reflex Reinforcement14.With the subject sitting comfortably in a chair, start data collection. If your graph has a stablebaseline, stop data collection and continue to Step 15. If your graph has an unstable baseline, stop data collection and repeat until you have obtained a stable baseline for 5 s. 15.Collect patellar reflex data without and with reinforcement. Note: Read the entire step beforecollecting data to familiarize yourself with the procedure.a.Have the subject close his/her eyes, or avert them from the screen. b.Start data collectionc.After recording a stable baseline for 5 s, swing the reflex hammer briskly to contact the mark on the subject’s tendon. If this does not result in a visible reflex, aim toward other