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Comparative Analysis of Lower Limb Kinematics between the Initial and Terminal Phase of 5km Treadmill Running
Chapters
Summary July 17th, 2020
This study investigated the biomechanical characteristics of the lower extremity kinematic variables between the initial and terminal phase of 5 km treadmill running. The lower-limb kinematic data of 10 runners were collected using a three-dimensional motion capture system on a treadmill at the initial phase (0.5 km) and the terminal phase (5 km), respectively.
Transcript
This method can be used to investigate second question about by owner chemical changes that occur in nature and turn off phases or long distance work out in amateur runners. Some advantage of this technical is that it can provide specific details about how to explore potential factors that cause running injury. To calibrate the analysis software, switch off the lights in the lab and remove any possibly reflective objects.
Place eight cameras in the appropriate positions around the experimental area such that they have a clear view of the action without reflection. To engage the cameras, open the software and select system, local system and MX cameras in the resources pane. Place the T-frame in the center of the capture area.
Select all of the cameras in the system and select the 2D mode. Confirm that the T-frame is in the camera view without any interference points and select system preparation. In the T-frame drop down list, select the five marker wand and T-frame calibration object.
In the system preparation tools pane, click the Start buttons in the mask cameras and to calibrate MX camera sections. When the calibration process is completed, the progress bar will be restored to zero percent. To establish the origin of the coordinates, place the T-frame in the center of the camera field of view and in the tool pane, click the Start button in the set volume origins section then position the treadmill in the center of the test zone within the center of the fields of view of all eight of the cameras.
Before performing an analysis, give a sample explanation of the experimental procedures to the subject and have the subjects complete a questionnaire. After obtaining written consent, record the subjects height, lower limb length, knee width, and angle with in millimeters and the subjects weight in kilograms. After obtaining all of the measurements, place one reflective marker each at the anterior superior iliac spine, posterior superior iliac spine, lateral mid thigh, lateral knee, lateral mid shank, lateral malleolus, second metatarsal head and calcaneus.
Then place markers on the second metatarsal head and calcaneus on the corresponding anatomical points of the socks and shoes, and have the subject warm up with a light running and stretching for five minutes. For a static calibration of the markers, click the data management button on the toolbar and select data management. Under the new database tab, select to the location, describe the trial name and the clinical template and click Create.
In the open database window, select the name of the database that was created. In the open interface, click the green new patient classification button, the yellow new patient button and the gray new session button to create a new experiment. In the Nexus pane, click subjects to create a new subject data set and select trial model.
In the properties pane, fill in all the anthropometric measurements and click Go Live. Select split horizontally, and select the graph to check the trajectory count. To capture the static model, in the capture tools pane, click Start in this subject capture section, and view the capture marks in the perspective pane.
To create a 3D image of the captured markers, click the pipeline button in the tools pane and select running the reconstruct pipeline and manually label this static model. When the identification is completed, save and press Escape to exit. In the toolbar, select subject preparation and the subject calibration and select the static plug in gate option from the drop down list.
Then in the static settings pane, select left foot and right foot. Click Start and save the static model. To start a dynamic trial, select capture in the software and select the trial type and session.
After filling in the trial description, now the subject put on a heart monitor. And ask the subject to warm up on the treadmill by walking at eight kilometers per hour for one minute. At the end of the warm up period have the subject run for four minutes at a speed of 10 kilometers per hour, recording the kinematic running data for 40 seconds at the point five and five kilometer distance points respectively.
At the end of the dynamic trial, click stop to end the collection. For kinematic processing, open the data management window and double click the trial name. click the run reconstruct pipeline and labels buttons in the toolbar to reconstruct the mark point position and in the perspective window, move the blue triangles on the time bar to set the required range of time.
Shift the view of the timeline so that it shows only the selected range. Click on the time bar and click zoom to region of interest. Next, select the label button to identify and check the label points as demonstrated for the static identification process, supplementing any incomplete identification points as necessary.
In the subject calibration pane, select the dynamic plug in gate. Then click the start button to run the data and export the material trials in three CD format for post processing. In this representative analysis, no differences in the peak angle of the ankle or the hip were observed in the sagittal plane.
Compared with the initial phase, the peak angles of the ankle and the knee in the frontal plane were significantly increased in the terminal phase, while a larger internal hip angle was measured in the terminal phase. However, in the transverse plane, the terminal phase presented a smaller peak angle in hip abduction and angle and knee into rotation. In the sagittal plane, the ranges of motion of the ankle and the knee were significantly increased in the initial phase compared to the terminal phase.
In the frontal plane, the hip range of motion was significantly decreased in the terminal phase compared to the initial phase. Whereas the ranges of motion of the ankle and the knee were increased in the terminal phase. In the transverse plane, the knee range of motion was found to be significantly lower in the terminal phase compared to the initial phase.
But no differences were observed in the ranges of motion of the ankle or the hip. Making sure that the marks do not fall off analyzes is the most important aspect of this procedure.
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