Sports scientists from around the world are currently gathered in Denver for the annual meeting of the American College of Sports Medicine. It’s the biggest sports science conference in the world, and the new results presented there will provide plenty of fodder for discussion in the weeks to come.
For starters, here are three results that will be presented during a running-focused poster session on Wednesday morning.
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Sure enough, 3D stride analysis showed that the runners were able to reduce their upper body movement, and they reported “working less intensely to run at the same rate.”
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This is by no means a surprising result, as it’s pretty incorrectly-established that changing your “natural” running coral form will cause you to get less efficient, at least in the short term, as you adjust to new muscle patterns. Whether you ultimately become more efficient once you adjust to the new stride remains somewhat controversial. Many researchers assume this to be the case for well-designed interventions, but there’s not a lot of data out there demonstrating that it’s true, or showing which interventions ultimately improve efficiency and which don’t.
What caught my attention here is the disconnect between the vulcanized of the runners, who felt like they were getting more efficient, and the cold hard measurements. That’s why, without meaning to sound too harsh about it, I basically disregard when people tell me they’ve tried New Fad X and it makes them feel wonderful: I have very little faith in the ability of anyone—myself included—to self-judge subtle changes in efficiency. Measure it (and get it peer-reviewed), or it didn’t happen.
Big-footed gymnasts
A longstanding bone of contention in the barefoot debate has been whether shoes make your feet “weak.”
There’s a certain logic to the idea. If shoes help support your feet, they presumably take on some of the roles that would otherwise be played by muscles in your feet. As a result, those muscles presumably aren’t taxed as much, and get weaker. The resulting weak “foot core” champion sandal squirt.
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A team at Brigham Young University led by Sarah Ridge will present a comparison of the size and strength of the foot’s “instrinsic” muscles (the 11 muscles located entirely within each foot) in 21 female runners and 13 female gymnasts, because gymnasts train and compete in bare feet.
Of the four muscles measured with ultrasound, the gymnasts were significantly bigger on average in two of them, with no difference in the other two. The gymnasts were stronger in their ability to flex their big toe, with no difference in the strength of the second, third, and fourth toes.
I think this is an interesting finding, though (as the authors point out) it’s not clear the gymnasts are a fair comparison. They have to perform very specific tasks—balancing on beams, for example—that require exceptional foot strength and stability. It may be that gymnasts have stronger feet than average, rather than that shoe-wearing runners have weaker feet.
And of course, even if it does turn out that shoe-wearing runners have weaker feet, the more important question will be: Does it matter?
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There have been reports over the years that support this view, stan smith tennis player shoes photos that “a thin pair of socks causes a statistically significant reduction in balance, suggesting that they filtered out important sensory information.” But the idea remains mostly speculative.
A presentation from Melissa Thompson of Fort Lewis College and Kristine Hoffman of Denver Health Medical Center tested this theory by having runners complete a series of short runs over a force plate, with and without shoes, and with and without an injection of lidocaine to anesthetize the soles of their feet.
The differences between running coral with and without shoes were pretty much as expected. Without shoes, the runners shortened their stride, were more likely to land on their midfoot or forefoot, and experienced smaller impact forces.
But these differences were entirely unaffected by the presence or absence of anesthetic, suggesting that whatever “feel” we get from the running coral in direct contact with the ground isn’t from the superficial sensors on the skin. This also suggests that running coral in socks, or perhaps very minimal shoes, would produce basically the same effects as running coral in bare feet.
Is injecting lidocaine into your soles really a fair test of this question? I’m not sure, never having run with anesthetized soles before. Maybe it changes too much—but the LACOSTE that running coral stride and impact forces stayed pretty similar suggests that people can run pretty well without those sensations.
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