p***r
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bushiathena (athena) 于 (Sun Jul 11 14:37:11 2010, 美东) 提到:
小绿最后受伤，似乎是跟她路跑有关，让我再次想起那个跑硬路面是否伤关节的问题，
找了点reference:
http://www.ncbi.nlm.nih.gov/pubmed/10433420?dopt=Abstract
http://www.ncbi.nlm.nih.gov/pubmed/12048328?dopt=Abstract
是不是说，路面的确有软硬之分，但是如果running form可以做相应调整，可以使得对
关节的shock程度基本没有太大变化？请王欢喜来分析一下。
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whxhm1 (whxhm) 于 (Sun Jul 11 14:38:28 2010, 美东) 提到:
Yes, I make adjustments when I run on concrete these days. In fact, I almost
run exclusively on forefoot on
concrete -- which is what I did in Mexico City.
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bushiathena (athena) 于 (Sun Jul 11 14:41:06 2010, 美东) 提到:
so if we run with the right form, the difference of running surface is
ignorable?
almost
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whxhm1 (whxhm) 于 (Sun Jul 11 14:42:48 2010, 美东) 提到:
There is always going to be some difference. The question is only whether
you are tough enough for it.:)
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bushiathena (athena) 于 (Sun Jul 11 14:47:44 2010, 美东) 提到:
i have run on concrete for 8 monthes now, so far so good. i hope i can do
this for 60 years :)
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gleaner (gleaner) 于 (Sun Jul 11 14:49:15 2010, 美东) 提到:
Thank you guys. It's true I'm a heel striker, I rarely land with midfoot,
and never land with forefoot.
will do the forefoot running whx mentioned. It will be fun.
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bushiathena (athena) 于 (Sun Jul 11 14:50:21 2010, 美东) 提到:
i'm a heel striker too
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gleaner (gleaner) 于 (Sun Jul 11 14:54:58 2010, 美东) 提到:
这两个reference都很professional啊。要好好看看。
我想我受伤的主要原因是大街上很不平。 trail是沥青铺的，感觉硬度跟水泥路差不多
，但是很平，往往在trail上能保持同一个姿势像机器人一样跑完一个long run。大街
上老是要跳来跳去。
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bushiathena (athena) 于 (Sun Jul 11 14:58:59 2010, 美东) 提到:
Will running on concrete increase my risk of injury?
Sami Siva/The Globe and Mail
New research contradicts earlier studies that say we adapt our running
stride so that hard and soft surfaces administer roughly the same shock to
the body
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. Column Comments (10) Alex Hutchinson
From Thursday's Globe and Mail
Published on Thursday, Oct. 29, 2009 11:00AM EDT
Last updated on Tuesday, Mar. 02, 2010 5:38PM EST
.The question
Will running on hard surfaces like asphalt and concrete increase my risk of
injury?
The answer
In a study to be published later this year, Brazilian researchers found that
your feet feel about 12 per cent more pressure with each foot strike when
running on asphalt compared with grass.
Thanks for that newsflash, Captain Obvious, you might say.
But the findings actually contradict several earlier studies, which –
despite what our intuition tells us – have found that we seem to
automatically adapt our running stride so that hard and soft surfaces
administer roughly the same shock to the body.
In fact, it may be the smoothness of paved surfaces that makes them
dangerous to runners, rather than their hardness. And softer, less even
surfaces carry their own injury risks, so the best answer may lie somewhere
in the middle.
“Understanding why and how runners get injured, and the role of the surface
, would be like winning the Nobel Prize of sports science research,” says
Katherine Boyer, a Canadian biomechanics researcher now at Stanford
University in California.
The surprising idea that your body can make adjustments for different
running surfaces dates back to studies in the 1990s. Researchers found that
when they varied the stiffness of a running surface, runners adjusted the
effective stiffness of their legs in the opposite direction – by bending
their knees slightly more or less and by tensing their muscles – so that
their total up-and-down motion remained perfectly constant.
In support of this notion, a 2002 study by Mark Tillman of the University of
Florida, using force-sensing shoe inserts, found no difference in the
forces created by running on asphalt, concrete, grass and a synthetic track.
The 12-per-cent difference found by Vitor Tessuti of the University of Sao
Paulo, which will appear in the Journal of Science and Medicine in Sport
later this year, is still relatively small. And a companion study, yet to be
published, found no difference between asphalt, concrete and a synthetic
track.
Even when the forces on the feet are the same, though, the slight
differences in knee angle and other parameters could theoretically translate
into greater likelihood of injury on one surface compared with another, Dr.
Tillman cautions.
The bottom line, for now, is that the simple picture – harder surface leads
to more pounding leads to injury – isn't supported by the existing
evidence. Indeed, on-the-ground studies such as one from 2003 that followed
844 runners preparing for the 10-kilometre Vancouver Sun Run have failed to
find any association between running surface and injury rate.
But there are other factors to consider, Dr. Boyer says. Smooth, flat, paved
surfaces will result in every stride being basically the same, so your
muscles and joints are stressed in exactly the same way throughout the run.
.
On unpaved surfaces, in contrast, no two steps are the same, which provides
slight variations in the impacts on your body, reducing the chance of an
overuse injury. Too much unevenness, though, carries risks such as a turned
ankle.
“The key is to find the balance between stress and overstressing the system
,” Dr. Boyer says.
The principle of specificity also applies: If you do all your training on
one surface, your body may not be adequately prepared to run on other
surfaces – especially in long, demanding races.
“I do make a calculated effort to run more on the roads when preparing for
a marathon,” says Dylan Wykes, Canada's second finisher at last summer's
World Championships in Athletics marathon in Berlin.
Mr. Wykes's normal training regimen is about half on roads and half on grass
and gravel trails, but he increases the road component to 75 per cent
before marathons to make sure his legs are prepared for the unchanging
impacts of 42.2 kilometres of smooth asphalt.
This approach, incorporating a healthy mix of different surfaces, is one
most runners would do well to emulate – at least until biomechanics
researchers reach a firmer conclusion. Still, the pile of conflicting
research results suggests that, if your circumstances do force you to run
exclusively on paved surfaces, it doesn't mean instant injury.
Alex Hutchinson blogs about research on exercise and athletic performance at
www.SweatScience.com.
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gleaner (gleaner) 于 (Sun Jul 11 14:59:36 2010, 美东) 提到:
我刚开始的时候是非常的heel striker, 由脚后跟非常后面着地，然后前面的依次着地
。有一次跑了一个tempo后，姿势发生了变法，发现稍微快一点就midfoot landing, 慢
下来就脚后跟着地了。我那时候还想，以后速度再快，说不定就自然的前脚掌着地了。
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Rodimus (忍者) 于 (Sun Jul 11 15:10:22 2010, 美东) 提到:
我今天跑步的时候碰到一个很pp的asian mm穿着一个five finger在跑。。。
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gleaner (gleaner) 于 (Sun Jul 11 15:10:35 2010, 美东) 提到:
thanks. looks like I'm spoiled by the trail.
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whxhm1 (whxhm) 于 (Mon Jul 12 03:21:38 2010, 美东) 提到:
There is no necessary correlation between foot strike and the speed. These
days when I warm up for a run, I always start with forefoot strike, and
switch to midfoot later. The reason is that forefoot strike offers maximal
protection on the joints, and that is particularly important when I'm not
fully warmed up.
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outbacker (IRUN) 于 (Mon Jul 12 09:50:58 2010, 美东) 提到:
其实累了就会受伤,在跑步机上track上都这样. |
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