[pct-l] to prevent injury

Yoshihiro Murakami completewalker at gmail.com
Sun Sep 23 18:47:30 CDT 2012


Dear Sym

I do not think hip belt causes ankle injuries.  Shoes in more closely
related to the cause.


2012/9/24 Blanchard, Sym <SWB3 at pge.com>:
>
> With all due respect, none of your studies specifically addressed the effect of hip belts on ankle injuries.
>
> There are other methods besides empirical studies to determine the possibility of a theory.  As an engineer, I could do a dynamic stress analysis on paper to measure the forces on an ankle when a  mass is rigidly fixed to a quickly falling spine and body.  I have not done so.  But my engineering experience (31 years), my engineering intuition, and my personal antidotal experience tells me that this is a distinct possibility.   I think most engineers, including Ray Jardine (also an engineer), would naturally get the same sense of the result of these forces acting on a falling body.
>
> By your reasoning, people should have continued smoking throughout the 1940's and 1950's until all the empirical studies were completed in the 1960's showing that smoking could cause cancer.
>
>  I greatly appreciate your input and research.  This process  helps unravel some of life's little mysteries.  I think we can agree to disagree on this one.  But please let me know if you see other studies which more specifically address this situation.
>
> Symbiosis
> Skykomish, Washington
>
> On Sep 23, 2012, at 4:11 PM, "Yoshihiro Murakami" <completewalker at gmail.com> wrote:
>
>> Dear Sym
>>
>> "Absence of evidence is not evidence of absence" is wrong. Absence of
>> evidence is just absence. The thinking without evidence is only  an
>> imagination.
>>
>> Concerning ankle injury, there are several related researches.
>>
>> Rowson S., McNally C.,\& Duma S.M. \ \ 2010 \ \ Can footwear affect
>> achilles tendon loading? { \it Clinical Journal of Sport Medicine},
>> 20, 344-349.}
>> indicated high cut boots reduced 9.9% of maximal shock.
>>
>> Boehm , H.,\& Hoesl, M. \ \ 2010 \ \ Effect of boot shaft stiffness on
>> stability joint energy and muscular co-contraction during walking on
>> uneven surface. {\it Journal of Biomechanics, 43, 2467-2472} }
>> indicated stiff boots reduced the stress of ankles, but increased the
>> stress of knee joints.
>>
>> Handoll, H.H., Rowe, B.H., Quinn, K.M., de Bie, R. \ \ 2001 \ \
>> Interventions for preventing ankle ligament injuries(Reviews). {\it
>> Cochrane Database Systematic Review}, 2001;(3):CD000018.  indicated
>> the support function of boots ( no direct evidence but the supporter
>> -Air Cast-- had clear supportive function)
>>
>> On these facts, I simply thinks shoes wearer  prone to suffer ankle
>> injury. Then the shoes wearer should train their calf and ankles. I
>> don't know which is the better training method. That is: I don't know
>> "half Bocce ball".
>>
>> There are many wrong ideas and knowledge in Ray Jardine's books.
>>
>>
>>
>> 2012/9/24 Blanchard, Sym <SWB3 at pge.com>:
>>> My bad.  I hit the send button accidentally.  Gotta love this iPhone keyboard.
>>>
>>> The third paragraph should read as follows:
>>>
>>>
>>> I do disagree with the notion that no published studies showing that wearing a hip belt can cause ankle injuries disproves the case .  Absence of evidence is not evidence of absence.  I doubt there has been funding or interest to specifically look at this issue, in particular affecting older hikers who just completed 2645 miles and whose support muscles may be fatigued.
>>>
>>> I would think that ankle exercises on a half Bocce ball would be a better exercise to prevent ankle exercises than wind sprints.
>>>
>>> Symbiosis
>>>
>>> On Sep 23, 2012, at 2:22 PM, "Blanchard, Sym" <SWB3 at pge.com<mailto:SWB3 at pge.com>> wrote:
>>>
>>> I agree that if you have to wear a heavy pack or if you have back issues, then a cinched hip belt would be a good idea.
>>> However it is my opinion that this can also increase the chance of ankle injuries.
>>>
>>> I think that trekking poles can help reduce this risk, but then there are the inherent disadvantages with poles (inefficient, cumbersome, tripping hazard...).   No such thing as a free lunch.
>>>
>>> I do disagree with the notion that wearing a hip belt can not  cause  Absence of evidence is not evidence of absenceproves
>>>
>>> Thanks,
>>> Sym Blanchard
>>> 925-588-9478
>>>
>>> On Sep 20, 2012, at 4:17 PM, "Yoshihiro Murakami" <completewalker at gmail.com<mailto:completewalker at gmail.com>> wrote:
>>>
>>> Thanks Melanie
>>>
>>> The waist belt of backpack has  very important role to support heavy
>>> load, as a result, the stress of spine is minimized.  If the total
>>> pack weight is less than 10 kg, waist belt may be unnecessary. I just
>>> pointed out no research may be exist concerning waist belt. But, it's
>>> importance is very clear, so the many backpack makers never abolish
>>> waist belt.
>>>
>>> I have just write my blog : if you have a time, please see. I wrote my
>>> blog in Japanese and English. I cannot write English properly but I
>>> think better than Google translator.
>>>
>>> My maximal total pack weight may be 38 kg or more:
>>>
>>> https://picasaweb.google.com/104620544810418955412/FromSouthLkToLonePine?feat=flashalbum#5783126003499446338
>>>
>>> I carried 20 days food ( for two persons 10 days ) and all the stuff,
>>> and guided my wife South Lake to Lone Pine. We did not lose weight,
>>> and suffered no injury.
>>>
>>> Recently, I bought new backpack ( Altra 75 ) and tested at the
>>> neighborhood Mountain. It worked well. I always carry backpack on the
>>> hip bone, not on the shoulders.
>>>
>>> https://sites.google.com/site/completewalker/equipments/backpack/altra-75
>>> https://picasaweb.google.com/104620544810418955412/MtHakubaToKeyakidairaSt
>>>
>>> for Tim, I think he may know himself.
>>>
>>> He should work on rehabilitation as soon as possible. When his bone
>>> became strong enough, he should train his muscle of lower legs. It is
>>> necessary to reinforce his muscular strength and agility. Then the
>>> possibility of injury becomes small.
>>>
>>>
>>>
>>>
>>>
>>> --
>>> Sincerely
>>> --------------- --------------------------------------
>>> Hiro    ( Yoshihiro Murakami  村上宣寛 )
>>> facebook  http://www.facebook.com/completewalker
>>> Blogs  http://completewalker.blogspot.jp/
>>> Photo  https://picasaweb.google.com/104620544810418955412/
>>> Backpacking since about 1980 in Japan
>>> JMT, 2009, 2010, 2011(half), 2012
>>> Handbook of Hiking will be published in 2013
>>> ------------------------------------------------------
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>>
>>
>>
>> --
>> Sincerely
>> --------------- --------------------------------------
>> Hiro    ( Yoshihiro Murakami  村上宣寛 )
>> facebook  http://www.facebook.com/completewalker
>> Blogs  http://completewalker.blogspot.jp/
>> Photo  https://picasaweb.google.com/104620544810418955412/
>> Backpacking since about 1980 in Japan
>> JMT, 2009, 2010, 2011(half), 2012
>> Handbook of Hiking will be published in 2013
>> ------------------------------------------------------
>
>
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-- 
Sincerely
--------------- --------------------------------------
Hiro    ( Yoshihiro Murakami  村上宣寛 )
facebook  http://www.facebook.com/completewalker
Blogs  http://completewalker.blogspot.jp/
Photo  https://picasaweb.google.com/104620544810418955412/
Backpacking since about 1980 in Japan
JMT, 2009, 2010, 2011(half), 2012
Handbook of Hiking will be published in 2013
------------------------------------------------------


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