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Effect of Footwear on Achilles Tendon Load

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  #1  
Old 8th September 2010, 03:31 PM
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Default Effect of Footwear on Achilles Tendon Load

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Can footwear affect achilles tendon loading?
Rowson S, McNally C, Duma SM.
Clin J Sport Med. 2010 Sep;20(5):344-9.
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OBJECTIVE: To investigate the effects of footwear on Achilles tendon tension by directly measuring Achilles tendon tension and dorsiflexion range of motion.

DESIGN: A total of 48 matched pair tests were performed comparing the effects of shoe type (high-top vs low-top) for each shoelace configuration (tied vs untied). These were performed using the Achilles tendons of 4 human cadaver lower extremities that were instrumented with a customized load cell designed to measure tension. The lower extremity was inverted in a custom testing apparatus designed to inertially invoke dorsiflexion of the foot, putting the Achilles tendon in tension.

SETTING: Research laboratory.

PATIENTS: Left and right lower extremities of 2 human cadavers.

INTERVENTIONS: None. Independent variables were shoe type and shoelace configuration.

MAIN OUTCOME MEASURES: Achilles tendon tension and dorsiflexion range of motion.

RESULTS: High-top shoes significantly reduced peak Achilles tendon tension by an average of 9.9% when compared with low-top shoes. Tied laces significantly reduced peak tension for low-top (3.7%) and high-top (12.8%) shoes when compared with untied laces. With tied laces, high-top shoes significantly reduced peak dorsiflexion angle by an average of 7.2% when compared with low-top shoes. Tied laces with high-top shoes significantly reduced peak dorsiflexion angle by an average of 4.7% when compared with untied laces. A P value of 0.05 was determined to be significant.

CONCLUSIONS: This study offers valuable insight that footwear can affect Achilles tendon loading during dorsiflexion.
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Old 11th September 2010, 08:08 AM
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Default Re: Effect of Footwear on Achilles Tendon Load

This is the kind of research that can be used to help clients and patients make the right choices in footwear provided it can be presented in an understandable way. Often what seems to be common sense gets disproved by research, in this case it's backing up what has until now been anecdotal.
Thanks for posting this. Bill Bird
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Old 11th September 2010, 11:20 AM
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Default Re: Effect of Footwear on Achilles Tendon Load

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Originally Posted by Bill Bird View Post
This is the kind of research that can be used to help clients and patients make the right choices in footwear provided it can be presented in an understandable way. Often what seems to be common sense gets disproved by research, in this case it's backing up what has until now been anecdotal.
Thanks for posting this. Bill Bird
Bill:

Unfortunately this research is on cadavers without any influence from central nervouis system control or from the dynamics of gait. This, of course, should temper our enthusiasm for assuming that the results from this study are representative of real life, but it certaiinly is a start in the right direction.
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Old 11th September 2010, 02:19 PM
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Default Re: Effect of Footwear on Achilles Tendon Load

hiya
excuse my ignorance but can someone clarify exactly what is meant by high top and low top shoes?

cheers
JB
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Old 12th September 2010, 03:38 AM
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Default Re: Effect of Footwear on Achilles Tendon Load

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hiya
excuse my ignorance but can someone clarify exactly what is meant by high top and low top shoes?

cheers
JB
Hi JB

I agree it is too vague even for an abstract.

The top line of a shoe is the finished edge where the foot goes in. I'm assuming that low top means the top line runs under i.e. distal to, the malleolli and high top means above i.e. proximal to the malleolli.
With the development of the cushion collar such as found on trainers, we now have footwear that has a soft top line that can end level with the prominence of the malleolli. In my experience, there are a lot of benefits to a cushion collar but in the context of this article I would assume that it's a low top unless the top line actually finishes proximal to the malleolli.

That's my professional opinion but may not be what the researchers had in mind.
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Old 16th September 2010, 04:56 PM
Jenene Lovell Jenene Lovell is offline
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Default Re: Effect of Footwear on Achilles Tendon Load

Hi,

I understand that this study was sone on cadavars, has there been any research that is done on "living" humans? If there is, does anyone hav a link?

My understanding is that there is no benefit to high top shoes except for in the case of ankle injuries, but even then an ankle brace is more beneficial. Am I wrong to assume this?
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