Pod 144: Grounded running, Glute fatigue & Stress Fractures

Topics: Grounded running, Glute fatigue, Stress Fractures, Duty Factor, Ankle stiffness & Gait and Concussions

Keywords: gait, gait analysis, gait problems, running, ankle, band, concussions, fatigue, fracture, gait, glutes, grounded, gait guys, glute medius, problems, stiffness, stress, syndrome, time under tension

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Our podcast is on iTunes and just about every other podcast harbor site, just google "the gait guys podcast", you will find us.

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Libsyn Directory URL: http://directory.libsyn.com/episode/index/id/8666903

Show notes:

Hip muscle response to a fatiguing run in females with iliotibial band syndrome.
Brown AM1, Zifchock RA2, Lenhoff M3, Song J4, Hillstrom HJ3.
Hum Mov Sci. 2019 Feb 8;64:181-190. doi: 10.1016/j.humov.2019.02.002. [Epub ahead of print]

Balance and Gait Alternations Observed More than 2 Weeks after Concussion: A Systematic Review and Meta-analysis.
Wood TA1, Hsieh KL1, An R1, Ballard RA2, Sonoff JJ1.
Am J Phys Med Rehabil. 2019 Feb 5. doi: 10.1097/PHM.0000000000001152. [Epub ahead of print]

Does Running Faster Put You at Greater Risk of a Stress Fracture?
New research finds that speed might not cause as much strain on the shins as we thought
By Hailey Middlebrook
Feb 12, 2019
https://www.runnersworld.com/health-injuries/a26221848/stress-fracture-speed-study/

Fast Running Does Not Contribute More to Cumulative Load than Slow Running\
Hunter, Jessica G.1; Garcia, Gina L.1; Shim, Jae Kun1,2,3; Miller, Ross H.1,2
Medicine & Science in Sports & Exercise: January 25, 2019

https://journals.lww.com/acsm-msse/Pages/articleviewer.aspx?year=9000&issue=00000&article=96699&type=Abstract


Grounded running Reduces Musculoskeletal Loading.
https://www.ncbi.nlm.nih.gov/pubmed/30480615
Med Sci Sports Exerc. 2018 Nov 21
Bonnaerens S1, Fiers P1, Galle S1, Aerts P1,2, Frederick EC3, Kaneko Y4, Derave W1, De Clercq D1.

Duty factor:
duty-factor. The duration of a gait cycle where each foot is on the ground
https://www.researchgate.net/figure/Illustration-of-the-duty-factor-The-duration-of-a-gait-cycle-where-each-foot-is-on-the_fig2_221908232

Ankle intrinsic stiffness changes with postural sway
PouyaAmiri, Robert E.Kearney
https://www.sciencedirect.com/science/article/pii/S0021929019300387


Ankle stiffness and foot collapse, correlation ?

A client who comes in with calf tightness and ankle stiffness can't be clumped into the catch all group that they need more ankle rocker or to just stretch out the posterior mechanism.

Screen Shot 2017-03-02 at 7.57.05 AM.png

In all likelihood they probably don't have a stable enough foot/arch and are passing their body mass over that unstable structure, collapse ensues before ankle rocker is completed during stance phase of gait. Thus, the body goes into a strategy the next joint complex up the chain and attempts to gain stability at the ankle complex and the most available tools, the posterior mechanism. The foot should be stable and the ankle should be mobile through sagittal ankle rocker. When the foot is unstable, things often switch; the once mobile ankle rocker shifts towards stability attempts. Not everyone needs ankle rocker work ! Don't force it, make them earn it once you find the root of the problem. In a huge chunk of the population, that stiffness and loss of ankle rocker is there as a coping mechanism to find stability. Don't take it away from them ! 
PS: raising someones arch with an orthotic doesn't earn any stability, it is borrowed, it is false, so keep that in mind. Not that it doesn't have value or a purpose, but nothing has been intrinsically fixed, only extrinsically and that cannot be forgotten. Someone has to pay for these loads coming into the system.
-Dr. Allen's rant of the day