![]() ![]() This does not however, mean that at all times when walking do humans have more motion in their midfoot. This experiment rejects that idea because it was found that humans actually use a significantly greater amount of motion in the midfoot while walking than chimpanzees. Why is this study important? This study is important because it was thought that the arch in human feet evolved to stiffen the foot while walking upright on two legs (bipedally) and that therefore chimpanzees would have a much greater motion in the midfoot than humans would while walking bipedally. While there were some great differences in motion along other planes the results state that the motion and parts of the foot involved are still activated at some point while walking, they are just activated during different parts of walking in chimpanzees and humans. Results: It was found that humans have a much greater range of motion along the sagittal plane (imaginary plane that divides the body into left and right sides) than chimpanzees, but the range of motion along the coronal plane (imaginary plane that divides the body into front and back) were similar in both species. The percentages on each image indicate the amount of motion in the midfoot that is being utilized during each part of taking a step. ![]() The dots on each foot indicate the markers that the researchers were using for data collection. Image of both a human and chimpanzee subject while walking. These angles were then used to determine the motion between the markers placed on the foot and understand the differences between human foot motion and chimpanzee foot motion. The data was analyzed using the packages ProAnalyst and MATLAB to calculate joint angles and estimate speed of walking. The researchers then selected representative steps for each subject to analyze the motion and utilization in certain regions of the foot. Methods: 3D kinematic data (a human or chimpanzee foot in motion) was collected by recording the subjects walking at a self-selected speed for 11 meters. These markers provided the data points that were analyzed in film after the experiment was completed. ![]() The scientists applied markers on the joints and other key points in the feet of both the humans and chimpanzees based on where they hypothesized to see foot motion in both species. What data were used? The only data that were utilized in this study were five male humans and two male chimpanzees that were recorded while walking. Summarized by Time Scavengers contributor, Maggie Limbeck Chimpanzee and human midfoot motion during bipedal walking and the evolution of the longitudinal arch of the foot ![]()
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