Bienvenido
¿Acabas de conocer el concepto Barefoot? Entra en el foro y comparte tu experiencia, conoce de primera mano las vivencias de otros descalcistas/minimalistas como tu.
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En mi blog hice referencia a este artículo y puse el enlace al estudio que citan.naxer82 escribió:PD: dice un estudio americano sin mencionar fuentes y se queda mas ancho que largo.
http://www.runblogger.com/2011/09/vibra ... nning.htmlYesterday, ACE released findings of a study of another red hot footwear trend. Specifically, they published results of a study that examined how running in the barefoot-style Vibram Fivefingers shoes compares to actually running barefoot, and to running in a typical cushioned running shoe.
The design of the ACE study was simple and straightforward. Researchers at the University of Wisconsin La Crosse recruited 16 healthy female runners to participate, and they provided each subject with a pair of Vibram Fivefingers Bikila running shoes. The subjects were allowed two weeks to acclimate to the shoes, and were instructed to run in them 3 times each week for up to 20 minutes on each occasion (or until discomfort occurred – I personally would advocate for an much slower ramp-up than this). After the two week acclimation period, the subjects were brought into the laboratory and they ran across a force platform under three footwear conditions (7 times in each condition): 1) barefoot, 2) in Vibram Bikilas, and 3) in neutral cushioned shoes (New Balance 625). Both kinematic (e.g., joint angles) and kinetic (force) measurements were made for each running trial.
Focusing first on kinematics, the results of the study indicated that all 16 individuals were heel strikers in the New Balance shoes. However, when barefoot or in the Vibram shoes, about half of the individuals switched to a forefoot strike landing pattern with greater plantar flexion of the ankle at the moment of ground contact. Additionally, regardless of foot strike type, the subjects exhibited less total knee flexion during stance when running barefoot or in Vibrams than when they were wearing the NB shoes (so form did change in some ways, even if foot strike pattern did not). When compared to both shod conditions, barefoot runners exhibited less pronation (I love this little nugget of data!).
With regard to kinetics, the researchers honed in on vertical loading rates - loading rate refers to how fast the foot impacts the ground (for more on this, read this post on loading rates). There is some debate about whether loading rate is a good predictor of the likelihood of suffering a running injury, but there exists evidence for at least an association between vertical loading rate and risk of certain types of stress fractures. Results of the ACE study indicated that forefoot strikers exhibited lower mean loading rates than heel strikers (see graph below). Among forefoot strikers, loading rates were significantly lower when the runners were barefoot or in Vibrams than they were when they were wearing the neutral cushioned shoes. The opposite pattern held for heel strikers - loading rates were significantly higher when barefoot or in Vibrams. Another way of saying this is that the cushioned shoes produced the lowest loading rates of the three conditions for heel strikers, but the highest loading rates for forefoot strikers.
So what does all of this mean? Well, first, it should be noted that this is not an article published in a peer reviewed research journal, so it’s difficult to evaluate it in full detail. However, given the information provided, what I find really interesting is that the results show that when you put an individual into a shoe like the Vibram Fivefingers, there seems to be only about a 50% chance that they will stop heel striking on their own. This matches closely the results of an acclimation study conducted by Daniel Lieberman, where he found that 7 of 12 individuals who were initially midfoot or heel strikers switched to a forefoot strike after 6 weeks of running in Vibram Fivefingers – Lieberman’s results are provided in the table below:
...............................Week 0........................Week 6
Strike Type.....% subjects (# subjects)....% subjects (# subjects)
Rearfoot...................72 (10).........................36 (5)
Midfoot.....................14 (2)..........................0
Forefoot....................14 (2)..........................57 (8)
Toe Strike..................0................................7 (1)
(no heel contact at all)
The results of the ACE study also match my very rough estimate of the percentage of the Vibram Fivefingers runners who were heel striking at the NYC Barefoot Run last Sunday (see video below for example - I have not tallied any numbers, just a rough guess from watching the video – barefooters seemed to be much more likely to forefoot strike).
Para mi la imagen hubiese sido la de Abebe Bikila. Por alguna razón cuando yo era pequeño en mi casa era muy conocido y eso que nadie en mi familia era corredor. Probablemente mis padres recordaban la noticia de la "hazaña" en las noticias, quizá vieran incluso imágenes en el No-do.Corriente escribió:Si a mi me preguntan hace algún tiempo, qué pienso de alguien que corre descalzo, la imagen que me viene a la mente es la de un faquir de larga barba, una especie de loco, místico, deportista, no demasiado listo, aficionado a masticar bombillas... Curiosamente tengo que decir que de todos los foros que frecuento (y frecuento alguno incluso de creación literaria), este es el único foro que he visto donde el que más faltas de ortografía comete soy yo. Por algo será.
Aquí está el enlace a la noticia del 29 de septiembre.Zephyr escribió:Finalmente, aporta alguna información novedosa, es la primera noticia que tengo que Rosa Díez calce VFFs, además se trata de una versión peculiar de lo que parecen unas VFFs Classic. Son rojas y con la suela negra. sabía de una versión temprana con el empeine de piel teñida de rojo, pero la suela era blanca