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# UMass Amherst KIN 460 - Lab #1

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KIN460 Lab #118 September 20221.) Figure 1 Graph A shows the mean reflex and reaction times for 10 subjects fromthe data set provided. The error bars shown represent the standard deviation.The graph shows that the mean of reflex time is the lowest, followed by the meanof the simple reaction time and the highest being the complex reaction time.Figure 1 Graph B also shows the mean reflex and reaction times for 10 subjectsalong with the information strictly from subject 2. Similarly to Graph A, reflex timeoccurs in the shortest amount of time, followed by simple reaction time and thenultimately complex reaction time. The correlation between the mean of the dataset as a whole and one specific subject are almost identical.2.) Figure 2 Graph A shows center of pressure (CoP) data that was collected fromParticipant 1 who was standing quietly on a force plate. The data was recordedfor 10 seconds at 100 Hz, which gave 1000 data points. The cluster of datapoints represents that a majority of the time the CoP is between -0.028 and -0.03on the x-axis and -0.016 and -0.036 on the y-axis.Figure 2 Graph B shows center of pressure (CoP) data that was collected fromParticipant 2 who was standing quietly on a force plate. The data was recordedfor 10 seconds at 100 Hz, which gave 1000 data points. The cluster of datapoints represents that a majority of the time the CoP is between 0.262 and 0.265on the x-axis and 0.223 and 0.232 on the y-axis.3.) Figure 3 shows data collected at joint angles of a single subject while walking.The sagittal joint angles used for data collection were the ankle, knee and hipjoints. For the angle of the ankle, there is a longer period of initial decrease andthen at the 12 percent stance phase there is a large and slow period of growthuntil 72 percent of the stance phase where it starts to decrease towards zero.After a slight initial drop, the angle for the knee joint increases to about 23° andthen starts to decrease till 66° where it starts to increase again at a higher rate.For the hip angle, the angle slowly decreases over the entire span of the stancephase.4.) Figure 4 shows data during a standing long jump. The vertical ground reactionforces (GRF_Z(N)) and surface electromyographic (EMG) signals from the rectusfemoris (RF) are displayed in the colors blue and red respectively. The RF_EMGis displayed on a secondary vertical axis to more accurately visualize the

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