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Sensitivity analysis of the treadmill running study

Writer:realleaderfitnessDate:2017-2-7 09:45:22
Sensitivity analysis: In order to further determine the influence of the different mechanical parameters constituting the presented model on the vertical and leg stiffness calculated, we performed a sensivity analysis on the treadmill running study. It was then possible to observe the relative influence of each mechanical parameter on the calculated stiffness values. It should be noted that the most sensitive parameter, for both vertical and leg stiffness estimates, is the contact time. Its variation influences the stiffness in a proportion of about 1 to 2, i.e., for instance a 10% reduction in contact time leads, according to this model, to a 20% increase in vertical stiffness or even 25% in leg stiffness. All the other parameters have a 1 : 1 weight or even less, especially anthropometrical parameters of body mass and leg length. 
Therefore, although the legs are not stiff either at landing or takeoff in the treadmill running, resultingin a slight overestimation of leg length, the influence of such a phenomenon on the accuracy of the stiffness calculations was not important. In addition, the results of the present study showed that the leg length value used in this sine-wave model can be obtained using anthropometric equations, on the basis of the individual’s height, without significant changes in the stiffness values obtained. Furthermore, a recent study did not find any significant variation in the stiffness values obtained with the proposed method, using an estimated value of leg length from the participant’s height according to Winter’s model,showing that this parameter is not crucial for improving the accuracy of the sine-wave model.
This entry was posted on February 7, 2017 Fitness