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17.Determine the mean force applied during each pinch.aTap and drag across the first plateau on the graph, to select the data representing the pinch strength of the thumb and index finger (see Figure 4). bChoose Statistics from the Analyze menu and record the mean pinch strength to the nearest 0.1 N in Table 5.cChoose Statistics from the Analyze menu to turn off statistics.dSelect the data in the second plateau, representing the pinch strength of the thumb and middle finger. Choose Statistics from the Analyze menu. eRecord the mean pinch strength to the nearest 0.1 N in Table 5.fChoose Statistics from the Analyze menu to turn off statistics.gRepeat this process to obtain statistics for the remaining two pinch strengths.RESULTSTable 1−Individual Grip Strength DataMaximum force (N)Mean force (N)Right hand grip strengthMe- 134.8 Alexis- 176.8Me- 109 Alexis- 156.2Left hand grip strengthMe- 109.7 Alexis- 187.5Me- 95.6 Alexis- 168.3Table 5−Individual Pinch Strength DataMean force (N)Dominant hand index fingerMe- 32.3 Alexis- 52.5Dominant hand middle fingerMe- 33.1 Alexis- 53.7
Dominant hand ring fingerMe- 28.7 Alexis- 35.6Dominant hand little fingerMe- 21.3 Alexis-13.8DISCUSSION1.Is there a difference in grip strength in your dominant and non-dominant hands? Are you surprised by the result? 2.Examining the data in Table 3, does there appear to be a correlation between “handedness” and grip strength? Are the results similar for right-handed and left-handed people? 3.Is there a difference between the grip strengths in the different categories of height for which data was collected in Table 4? What conclusion can you draw about the relationship between height and grip strength?4.Does gender play a more significant role in grip strength than height? than “handedness?”5.Using the pinch strength data in Table 5, describe the difference in strength between fingers. Where is the difference the largest?6.List at least two possible reasons for the differences you see between the pinch strength of the first two fingers and the second two fingers. In your answer consider actions of the hand and musculature (Use an anatomy textbook or atlas to view the muscles of the forearm and hand). Your first two fingers are stronger than the next and so on. You use those finger muscles more so that is why they are stronger. Lab 6: Introduction to EMG
PURPOSEThe purpose of the lab is to obtain a representation of the electrical activity of muscle, associate the amount of electrical activity with strength of muscle contraction, and compare masseter muscle function during different chewing activities.