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new method to measure and understand the influence of leg stiffness on performance in treadmill running conditions

Writer:realleaderfitnessDate:2017-2-7 09:50:22
This model also assumes a constant point-of-force application on the ground during the entire contact phase in the treadmill running process. However, the location of the point-of-force application was shown to move forward by about 0.16 m, and this constitutes another limitation of the simplest spring-mass model.
Finally, it is worth noting that the limits of the proposed sine-wave method are also those inherent in the use of any theoretical spring-mass model, i.e., the human lower limb is not a true linear spring in a physical sense. This point has been widely discussed elsewhere.Even if one prefers the term “quasi-stiffness", the simplicity and predictive power of the spring-mass model in studies aimed at understanding and analyzing human running performance outweigh the limitations.
The equations based on a force-time curve sine modeling allow these calculations from simple mechanical parameters of flight and contact times, leg length, body mass, and running velocity. The reference-model biases on calculated stiff-ness were acceptable for a wide range of velocities, different levels of runners, and either on a treadmill running dynamometer or overground. To conclude, this new method may allow researchers to measure and to understand the influence of leg stiffness on performance in field running conditions and also to improve track & field coaching and training.
This entry was posted on February 7, 2017 Fitness