Podcast 97: Decomposition of human movement.

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Topics: Decomposition of movement, sacrificing speed and efficiency for movement, gait efficiency, arm swing, more on injuries and unshod running and more !

A. Link to our server: http://traffic.libsyn.com/thegaitguys/pod_97final.mp3

Podcast Direct Download:  http://thegaitguys.libsyn.com/podcast-97

Other Gait Guys stuff

B. iTunes link:
https://itunes.apple.com/us/podcast/the-gait-guys-podcast/id559864138
C. Gait Guys online /download store (National Shoe Fit Certification & more !)
http://store.payloadz.com/results/results.aspx?m=80204
D. other web based Gait Guys lectures:
Monthly lectures at : www.onlinece.com type in Dr. Waerlop or Dr. Allen, ”Biomechanics”

-Our Book: Pedographs and Gait Analysis and Clinical Case Studies
Electronic copies available here:

-Amazon/Kindle:
http://www.amazon.com/Pedographs-Gait-Analysis-Clinical-Studies-ebook/dp/B00AC18M3E

-Barnes and Noble / Nook Reader:
http://www.barnesandnoble.com/w/pedographs-and-gait-analysis-ivo-waerlop-and-shawn-allen/1112754833?ean=9781466953895

https://itunes.apple.com/us/book/pedographs-and-gait-analysis/id554516085?mt=11

-Hardcopy available from our publisher:
http://bookstore.trafford.com/Products/SKU-000155825/Pedographs-and-Gait-Analysis.aspx

Show notes:

-Brain Friendly Interface Could Change the Way People with Spinal Cord Injuries Lead Their Lives
http://neurosciencenews.com/extracellular-matrix-brain-interface-2395/

-Barefoot vs Shoe debate
http://www.theglobeandmail.com/life/health-and-fitness/fitness/barefoot-vs-shod-running-its-a-dead-heat/article26180292/

-Sacrificing speed and efficiency for stability as we age (1) . Not a bad plan. Kind of like what we spoke about here below in this video: returning to a more primitive state as the system starts to break down.

1. Zurales K, DeMott TK, Kim H, et al. Gait efficiency on an uneven surface is associated with falls and injury in older subjects with a spectrum of lower limb neuromuscular function: A

prospective study. Am J Phys Med Rehabil 2015 Jun 5. [Epub ahead of print]

https://www.youtube.com/watch?v=_fBjyutWQvU  video link to our video on this

-http://lermagazine.com/news/in-the-moment-gait/speed-trap-slowest-seniors-have-increased-mortality

-Shoe:  the UnderArmor Fat Tire GTX Trail shoe.

https://www.underarmour.com/…/mens-ua-fat-tire-g…/pid1262064

- assessing the different genders: http://www.ncbi.nlm.nih.gov/pubmed/12689785

Ferber R, Davis IM, Williams DS 3rd. Gender differences in lower extremity mechanics during running. Clin Biomech 2003;18(4):350-357.

-Arm Swing
http://thegaitguys.tumblr.com/post/128715659449/unique-adaptations-to-arm-swing-challenges-the

Oxygen cost of running barefoot vs. running Shod.

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This study concluded that at 70% of vVO (2)max pace, barefoot running is more economical than running shod, both overground and on a treadmill.  So, if you have a competent enough foot to run barefoot or in minimalistic footwear, and it is important to note that some people are not purely from an anatomical perspective, you can improve your economy of running and use your energy sources efficiently. But if you are one of those unfortunate ones that has excessive pronation or other functional foot challenges, you will have to settle for the less economical shod running.  That does not mean you will not have as good a workout, it just means that you will be protecting your foot doing so.  Sure, you might not be the fastest one on the track, but you will be able to show up every day having not compromised  your feet.

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Int J Sports Med. 2011 Jun;32(6):401-6. Epub 2011 Apr 6.

Oxygen cost of running barefoot vs. running Shod.

Hanson NJ, Berg K, Deka P, Meendering JR, Ryan C.

Source

Health, Physical Education and Recreation, University of Nebraska at Omaha, United States. njhanson@gmail.com

Abstract

The purpose of this study was to investigate the oxygen cost of running barefoot vs. running shod on the treadmill as well as overground. 10 healthy recreational runners, 5 male and 5 female, whose mean age was 23.8±3.39 volunteered to participate in the study. Subjects participated in 4 experimental conditions: 1) barefoot on treadmill, 2) shod on treadmill, 3) barefoot overground, and 4) shod overground. For each condition, subjects ran for 6 min at 70% vVO (2)max pace while VO (2), heart rate (HR), and rating of perceived exertion (RPE) were assessed. A 2 × 2 (shoe condition x surface) repeated measures ANOVA revealed that running with shoes showed significantly higher VO (2) values on both the treadmill and the overground track (p<0.05). HR and RPE were significantly higher in the shod condition as well (p<0.02 and p<0.01, respectively). For the overground and treadmill conditions, recorded VO (2) while running shod was 5.7% and 2.0% higher than running barefoot. It was concluded that at 70% of vVO (2)max pace, barefoot running is more economical than running shod, both overground and on a treadmill.

Going to try a new pair of shoes at the running store ? You better read this first. Shoe stores, shoe manufacturers, pay attention !

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Stiffness adaptations in shod running.

Source : J Appl Biomech. 2005 Nov;21(4):311-21.

Physiology Laboratory, PPEH Unit, University of Saint-Etiene, France.

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What The Gait Guys have to say about this article:

How long do you run in the shoes at the store before you decide whether they are a good match or feel for you ? This study suggests that if you take less than 4 minutes in a pair, you are not getting the accurate feel of the shoes.  Your “running stiffness” takes at least 4 minutes to adapt and alter to a given shoes materials.  Each shoe will likely feel different.  Don’t be fooled by the EVA’s softness, or the sock liner’s plushness. They might be there to offset what this study found, that being…… shoe stiffness increased significantly during the first 4 minutes but beyond the 4th minute, shoe properties remained stable.

How many stores or shoe companies are telling you this one !? 

Well, we are telling you right here and right now…….. first impressions are not always the best ones. 

  • “We don’t know where our first impressions come from or precisely what they mean, so we don’t always appreciate their fragility."  - Malcom Gladwell

* Read the study’s conclusion below…… and think (and feel) before you buy. Read your favorite internet blogger’s shoe reviews with an educated eye, and an open mind.  What they feel and report could very likely be the exact opposite of what you feel because their anatomy and running style could be very different from your own.

We are, without a doubt…… from all angles…….. The Gait Guys

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Abstract

When mechanical parameters of running are measured, runners have to be accustomed to testing conditions. Nevertheless, habituated runners could still show slight evolutions of their patterns at the beginning of each new running bout. This study investigated runners’ stiffness adjustments during shoe and barefoot running and stiffness evolutions of shoes. Twenty-two runners performed two 4-minute bouts at 3.61 m.s-1 shod and barefoot after a 4-min warm-up period. Vertical and leg stiffness decreased during the shoe condition but remained stable in the barefoot condition, p < 0.001. Moreover, an impactor test showed that shoe stiffness increased significantly during the first 4 minutes, p < 0.001. Beyond the 4th minute, shoe properties remained stable. Even if runners were accustomed to the testing condition, as running pattern remained stable during barefoot running, they adjusted their leg and vertical stiffness during shoe running. Moreover, as measurements were taken after a 4-min warm-up period, it could be assumed that shoe properties were stable. Then the stiffness adjustment observed during shoe running might be due to further habituations of the runners to the shod condition. To conclude, it makes sense to run at least 4 minutes before taking measurements in order to avoid runners’ stiffness alteration due to shoe property modifications. However, runners could still adapt to the shoe.

Article link: http://www.ncbi.nlm.nih.gov/pubmed/16498177 , get this article for yourself.

http://www.ncbi.nlm.nih.gov/pubmed/16498177