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| Format: | Artículo científico |
| Language: | en |
| Published: |
Universität Bern
2018
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| Subjects: | |
| Online Access: | https://www.redalyc.org/articulo.oa?id=677873366017 |
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Table of Contents:
- Running impact forces: from half a leg to holistic understanding – comment on Nigg et al. Kenneth P. Clark Andrew B. Udofa Laurence J. Ryan Peter G. Weyand Salud Two spring mass model effective mass running performance Running impact forces have immediate relevance for the muscle tuning paradigm proposed here and broader relevance for overuse injuries, shoe design and running performance. Here, we consider their mechanical basis. Several studies demonstrate that the vertical ground reaction force-time (vGRFT) impulse, from touchdown to toe-off, corresponds to the instantaneous accelerations of the body’s entire mass (Mb) divided into two or more portions. The simplest, a two-mass partitioning of the body (lower-limb, M1=0.08•Mb; remaining mass, M2=0.92•Mb) can account for the full vGRFT waveform under virtually all constant-speed, level-running conditions. Model validation data indi- cate that: 1) the non-contacting mass, M2, often accounts for one-third or more of the early “impact” portion of the vGRFT, and 2) extracting a valid impact impulse from measured force waveforms re- quires only lower-limb motion data and the fixed body mass fraction of 0.08 for M1. 2018 artículo científico 2414-6641 https://www.redalyc.org/articulo.oa?id=677873366017 en http://www.redalyc.org/revista.oa?id=6778 Current Issues in Sport Science application/pdf Universität Bern Current Issues in Sport Science (Suiza) Vol.3