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Barefoot vs. Shod Running - Physical Therapy and Rehabilitation ...

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<strong>Barefoot</strong> <strong>vs</strong>. <strong>Shod</strong> <strong>Running</strong>:<br />

An Evidence-Based Review of<br />

Ground Reaction Forces at<br />

Initial Contact<br />

Ryan Johnson, MS, DPT(c)<br />

PT 209-910


Clinical Problem:<br />

• Currently there is a significant lack of<br />

knowledge surrounding efficient running<br />

– What running patterns are most beneficial?<br />

– Is a heel strike really the best <strong>and</strong> most healthy<br />

running pattern?<br />

– What are the effects of footwear?<br />

– How can physical therapy assist runners to reduce<br />

injury <strong>and</strong> increase performance?


Significance of Problem:<br />

Number of<br />

PEOPLE<br />

interested in<br />

BF running<br />

Growing Trend<br />

(Fitzgerald M, 2010)<br />

Number of<br />

PATIENTS<br />

interested in<br />

BF running


<strong>Physical</strong> <strong>Therapy</strong> Relevance:<br />

Clinicians need Knowledge<br />

Research provides<br />

clinicians with an<br />

underst<strong>and</strong>ing of the<br />

biomechanics behind<br />

different running<br />

patterns<br />

Clinicians are able to<br />

make “evidencebased”<br />

decisions for<br />

each patient


<strong>Physical</strong> <strong>Therapy</strong> Relevance:<br />

Researchers need Inspiration<br />

Clinicians synthesize<br />

knowledge to make<br />

clinical decisions<br />

Pose questions to<br />

researchers to<br />

stimulate future<br />

studies


Purpose of Review<br />

Compare <strong>Shod</strong> <strong>vs</strong>. <strong>Barefoot</strong> (BF) <strong>Running</strong><br />

through analysis of<br />

Ground Reaction Forces (GRF)<br />

http://www.youtube.com/watch?v=9itkEkcQ8WM&feature=related


Theoretical Constructs<br />

• Repetitive impact forces through the body may<br />

be detrimental (l<strong>and</strong>ing hard after a jump or<br />

when stepping off curve, working all day with a<br />

jackhammer, FOOSH, etc.).<br />

(Sangha et al. 2000; Hewett et al. 2005; Hreljac et al. 2004; Schamberger et al. 2002)<br />

http://gallery.photo.net/photo/3069741-lg.jpg<br />

http://c.photoshelter.com/img-get/I0000KnYFMTjp0dg/s


Theoretical Constructs<br />

• The ground reaction force (GRF) upon impact,<br />

“is considered to be the most basic element<br />

which causes running related injuries.”<br />

http://jpthermt.com/wp-content/uploads/2010/07/running-injury.jpg<br />

(Robbins et al. 1987)


Theory behind BF <strong>Running</strong><br />

• Current scientists, paleontologists, anatomists <strong>and</strong><br />

physiologists have been challenging “traditional”<br />

knowledge on running biomechanics<br />

• Daniel E. Lieberman, PhD<br />

• Irene Davis, PhD, PT, FACSM<br />

• Madhusudhan Venkadesan, PhD<br />

• Mark Bishop, PT, PhD, CSCS<br />

• Craig Richards, PhD<br />

• R. Squadrone<br />

http://static.technorati.com/11/02/04/26399/wo<br />

man-running221.jpg


Theory behind BF <strong>Running</strong><br />

• Hypothesizing that l<strong>and</strong>ing on the mid-foot<br />

rather than a heel-first strike may:<br />

– Conserve energy<br />

– Reduce impact transient forces (Liberman DE et al., 2010)


http://www.ceessentials.net/images/critiqueLowerExtremity/image216.jpg<br />

Anatomy <strong>and</strong><br />

Theoretical Constructs<br />

http://www.carifinonline.com/wp-content/uploads/2010/01/heel-strike-compare.jpg


Proposed Benefits to BF <strong>Running</strong><br />

The following have been postulated as possible<br />

benefits to BF running:<br />

• Decreased VO 2 consumption<br />

• Increasing the strength of the ligamentous <strong>and</strong> muscular<br />

support of the arch<br />

• Increased proprioception<br />

• Decreased risk of lower extremity injury, including:<br />

– Lateral Ankle Sprains<br />

– Plantar Fasciitis<br />

– Medial Tibial Stress Syndrome<br />

– Etc.<br />

(Hanson et al. 2011; Squadrone et al. 2009; Jungers et al. 2010;<br />

Robbins et al. 1989; Divert C, 2005; Divert C, 1985; Warran et al. 1987)


And Lastly….<br />

It has been proposed that BF running can<br />

decrease the transient ground reaction force<br />

experienced at initial contact (Liberman et al., 2010)<br />

http://www.stgeorgerunningcenter.com/wp-content/uploads/2011/05/running-barefoot.jpg


Background<br />

• Have running shoes ever been proven to<br />

reduce the risk of injury?<br />

• Answer<br />

– No… There has never been a peer review article<br />

published which showed a statistically significant<br />

reduction in injury rate for those individuals<br />

wearing shoes. (Richards et al., 2008)


Background<br />

• Are running related injuries a serious problem<br />

in the medical community?<br />

• Answer:<br />

– Yes… every year 65-80% of all runners suffer an<br />

injury. (McDougall, 2009; Warran et al. 1987)


GRF at initial<br />

contact<br />

(IC-GRF)<br />

Terms Defined<br />

Passive Peak<br />

(Impact Transient)<br />

Ground Reaction Forces (GRF)<br />

Active Peak


Heel Strike (HS)<br />

or<br />

“Rear Foot<br />

Strike” (RFS)<br />

http://4.bp.blogspot.com/_JadSUXnX75Q/S3aD2iNRnsI/AAAAAAAAAT8/sl<br />

8pbmfVQ70/s320/heelstrike.jpg<br />

Terms Defined<br />

Non-Heel Strike<br />

(NHS)<br />

Mid-foot/<br />

Forefoot Strike<br />

(FFS)


Gap in the Literature<br />

• There has never been a systematic review or<br />

meta-analysis addressing the relationship of<br />

IC-GRF to both shod/BF <strong>and</strong> location of first<br />

contact.<br />

http://www.superstock.com/stockphotos-images/1598R-38363


• Primary:<br />

QUESTIONS<br />

– While running, what are the differences in IC-GRF<br />

between BF <strong>and</strong> shod conditions?<br />

• Secondary:<br />

– While running, what are the differences in IC-GRF<br />

between HS <strong>vs</strong> NHS running patterns?<br />

Both are background questions


Hypothesis & Null Hypothesis<br />

H 0: H A:<br />

There is NO statistically<br />

significant difference in<br />

IC-GRF between:<br />

There IS a statistically<br />

significant difference in<br />

IC-GRF between:<br />

1) BF <strong>and</strong> <strong>Shod</strong> running conditions<br />

2) HS <strong>and</strong> NHS running patterns


Search Procedures<br />

• Databases (number of results)<br />

– PubMed (43)<br />

– CINAHL (17)<br />

• Search Terms:<br />

– “barefoot running”<br />

– “running barefoot”<br />

– “run barefoot”<br />

– “jog barefoot”<br />

– “barefoot runner(s)”<br />

• Dates included in search: 1980 – 2011<br />

– Last search performed: April 30 th , 2011


All articles were reviewed against the following criteria<br />

Inclusion Criteria Exclusion Criteria<br />

1. Must measure GRF with a<br />

force plate or 3D force<br />

transducer treadmill**<br />

2. Must compare BF running<br />

to <strong>Shod</strong> running<br />

3. Subjects were “normals” or<br />

“athletes” with no<br />

pathology present<br />

4. IC-GRF data must be<br />

available<br />

**(Low et al., 2010; Mainwald et al., 2008; Belli et al. 2001)<br />

1. Articles written in<br />

languages other than<br />

English<br />

2. Only abstract was<br />

available<br />

3. Subjects were less than<br />

16 years old<br />

4. GRF data was not able to<br />

be correlated with body<br />

weight of subjects


Secondary reviewer<br />

confirmed that the 7<br />

studies met the inclusion<br />

criteria


All studies: level of<br />

evidence 2b<br />

Summary of Included Studies


Effect Size<br />

Calculated<br />

Statistics<br />

BF <strong>vs</strong>. <strong>Shod</strong> running IC-GRF<br />

Primary Question<br />

High<br />

Q-Statistic<br />

R<strong>and</strong>om<br />

Effects Model<br />

Recalculated


<strong>Barefoot</strong> <strong>vs</strong>. <strong>Shod</strong><br />

Results<br />

R<strong>and</strong>om Effects Model<br />

Effect Size: -1.72<br />

Large Effect Size<br />

CI (-3.41, -0.04)<br />

Significant<br />

Q-Statistic<br />

121.92


Statistics<br />

HS <strong>vs</strong>. NHS running patterns IC-GRF<br />

Evaluate for<br />

difference between<br />

HS <strong>and</strong> NHS means<br />

Secondary Question<br />

z-test


Study<br />

Hammill<br />

et al.<br />

Lieberman<br />

et al.<br />

Squadrone<br />

et al.<br />

Divert<br />

et al.<br />

Baur<br />

et al.<br />

De Wit<br />

et al.<br />

Dickinson<br />

et al.<br />

# of<br />

Subjects<br />

HS<br />

Mean<br />

Results<br />

z-test comparing HS <strong>and</strong> NHS<br />

Heel Strike Non-Heel Strike<br />

HS<br />

SD<br />

10 1.59 0.31<br />

26 1.74 0.45<br />

8 1.72 0.4<br />

35 1.70 0.03<br />

14 1.62 0.15<br />

9 1.9 0.3<br />

6 1.39 0.67<br />

Study<br />

Hammill<br />

et al.<br />

Lieberman<br />

et al.<br />

Squadrone<br />

et al.<br />

# of<br />

Subjects<br />

NHS<br />

Mean<br />

NHS<br />

SD<br />

10 1.40 0.31<br />

26 0.58 0.21<br />

8 1.62 0.4<br />

BW IC-GRF<br />

Mean HS: 1.67<br />

Mean NHS: 1.20


Results<br />

z-test comparing HS <strong>and</strong> NHS<br />

HS NHS<br />

1.67 1.20<br />

Z-test: (95% CI)<br />

Upper CI: 0.85<br />

Lower CI: 0.08<br />

Statistically<br />

Significant<br />

Difference


Results:<br />

H 0:<br />

1) There is NO statistically significant difference<br />

in IC-GRF between BF <strong>and</strong> <strong>Shod</strong> running<br />

conditions<br />

2) There is NO statistically significant difference<br />

in IC-GRF between HS <strong>and</strong> NHS running<br />

patterns


Discussion<br />

1. Significant heterogeneity of data<br />

2. Possible causes for reduced IC-GRF<br />

3. Implications of reduced IC-GRF<br />

http://www.runningnut.com/wp-content/uploads/2010/09/barefoot-runner.jpg


This image cannot currently be displayed.<br />

Discussion<br />

BF/<strong>Shod</strong> Comparison<br />

- Number Sample of Size Strides Difference Measured


Discussion BF/<strong>Shod</strong> Comparison<br />

Possible Explanations for Heterogeneity of Data<br />

Distance run during data analysis<br />

• 6.5 meters <strong>vs</strong>. 1.2 kilometers<br />

http://100daysofmadness.com/wpcontent/uploads/2010/11/Son-<strong>Running</strong>-<strong>Barefoot</strong>.jpg<br />

Experience of <strong>Barefoot</strong> Runners<br />

• Adaptations to BF running<br />

could take several weeks<br />

(Robbins et al. 1987, 1989 <strong>and</strong> 1993)<br />

http://farm5.static.flickr.com/4012/4311804925_32cebc0631_o.png


Discussion BF/<strong>Shod</strong> Comparison<br />

Possible Explanations for Heterogeneity of Data<br />

– Experience of <strong>Barefoot</strong> Runners<br />

• De Wit et al. utilized only habitual shod runners in both BF<br />

<strong>and</strong> <strong>Shod</strong> conditions<br />

– Smaller ES (-0.33)<br />

http://communities.canada.com/calgaryherald/blogs/calgaryrunner/archive/2010/07/07/rac<br />

e-preview-canadian-mountain-running-championships.aspx


Discussion BF/<strong>Shod</strong> Comparison<br />

Possible Explanations for Heterogeneity of Data<br />

– Experience of <strong>Barefoot</strong> Runners<br />

• Squadrone et al. utilized experienced BF runners in both shod<br />

<strong>and</strong> barefoot conditions<br />

– Smaller ES (-0.25)<br />

http://www.barefootrunning.fas.harvard.edu/3<strong>Running</strong>BeforeTheModernShoe.html


Discussion BF/<strong>Shod</strong> Comparison<br />

Possible Explanations for Heterogeneity of Data<br />

– Experience of <strong>Barefoot</strong> Runners<br />

• Lieberman et al. utilized habitually shod <strong>vs</strong>. habitually BF<br />

runners<br />

– Larger ES (-3.44)<br />

http://www.healthynomics.com/wp-content/uploads/2009/08/barefoot-running1.jpg


Discussion<br />

The BF condition & FFS running pattern<br />

http://barefootted.com/uploaded_images/Sportsllustrated<br />

<strong>Barefoot</strong>01-719926.jpg<br />

decrease IC-GRF<br />

Causes?<br />

http://gearjunkie.com/images/1825.jpg


Discussion<br />

Causes of Decreased IC-GRF<br />

• Superior neurosensory feedback preparing musculature<br />

for next stride (Kurz <strong>and</strong> Stergiou, 2004)<br />

http://www.ransacker.co.uk/wp-content/uploads/2010/08/A-barefoot-runner-in-Hyde-001.jpg


Discussion<br />

Causes of Decreased IC-GRF<br />

BF condition tends to equal NHS running pattern<br />

(Lieberman et al. 2010; Squadrone et al. 2009; Divert et al. 2005)<br />

http://4.bp.blogspot.com/_JadSUXnX75Q/S3aD2iNRnsI/<br />

AAAAAAAAAT8/sl8pbmfVQ70/s320/heelstrike.jpg


Stretching of arch<br />

Discussion<br />

Causes of Decreased IC-GRF<br />

• first half of FFS<br />

• second half of RFS<br />

No energy return <strong>and</strong><br />

no dampening of forces<br />

(Lieberman et al.<br />

2010)<br />

http://www.youtube.com/watch?v=r6YhVN_YIUk


Change in stride length<br />

(Lieberman et al. 2010; Squadrone et al,<br />

2009;<br />

Divert et al, 2005; De Wit, 2000;<br />

Edwards et al. 2009, etc.)<br />

Discussion<br />

Causes of Decreased IC-GRF<br />

Greater vertical compliance,<br />

leading to lower rate of loading<br />

(Lieberman et al. 2010)


Discussion<br />

Reduced IC-GRF<br />

Implications?<br />

http://signaturestyleblog.com/wp-content/uploads/2011/03/girl_running_on_beach.jpg


Harm <strong>and</strong> Cost Effects<br />

• Not examined in any primary<br />

article<br />

– BF running reduces IC-GRF,<br />

theoretically there could be a<br />

reduction in stress-induced<br />

injuries<br />

– If stress induced injuries are<br />

reduced, theoretically health care<br />

costs could be reduced<br />

http://ravenessences.files.wordpress.com/2011/03/barefo<br />

ot_tefe_dancing.jpg?w=218&h=247


Possible Precautions/Contraindications<br />

• Osteoporosis/Osteopenia<br />

• Peripheral Neuropathy<br />

• Peripheral Arterial Disease<br />

• Rigid midfoot<br />

• Cold/Hot Temperatures<br />

• Obstacles on ground<br />

– Broken glass<br />

– Nails<br />

– Needles<br />

(Squadrone et al. 2009; Jenkins <strong>and</strong> Ross, 2011)<br />

http://shodless.com/wp-content/uploads/2010/01/michael_sadler_barefoot_winter.jpg


Shoes for forefoot strike?<br />

• Vibram Fivefingers<br />

• Tarra Plana Evo<br />

• Merrell Trail Glove<br />

• New Balance Minimus<br />

• Kigo Edge<br />

• Nike Free<br />

http://kayakshed.blogspot.com/2010/07/<br />

kigo-improves-its-minimalist-shoes.html<br />

http://www.vibr<br />

amget.com/ima<br />

ges/729013%5B<br />

1%5D.jpg<br />

http://www.treeh<br />

ugger.com/Terraplana-evobarefoot-runningshoe-photo.jpg<br />

http://www.sho<br />

pnewbalance.co<br />

m/products/MT<br />

10GY_lg.jpg<br />

http://runningti<br />

mes.com/rt/ima<br />

ges/201012/Trail<br />

Shoe_Merrell-<br />

Trail-Glove-.jpg<br />

http://www.nike<br />

freerunshop.co<br />

m/images/nike_<br />

free_run_men_b<br />

lack_red.jpg


Implications for Practice<br />

http://www.voxy.co.nz/userfiles/running%20barefoot%20shoes.jpg<br />

• Educate patients on<br />

evidence available at this<br />

point<br />

• Decreased IC-GRF with BF<br />

running<br />

– Effect size -1.72 = 41% BW<br />

• NHS also reduces IC-GRF<br />

• PT interventions?


Limitations<br />

• Heterogeneous studies<br />

– Heterogeneous subjects<br />

– Inconsistent distance run in experiment<br />

– Small sample sizes<br />

• Developing area of research<br />

– HS <strong>vs</strong> NHS required<br />

• Only included articles in English<br />

• Not enough data to determine interaction<br />

effect between BF <strong>and</strong> NHS


Directions for Further Research<br />

• Define normative values for specific sub-groups<br />

of runners<br />

• Further examine differences between habitually<br />

shod <strong>and</strong> barefoot runners<br />

• Investigate whether minimalist shoes mimic the<br />

positive aspects of BF running<br />

• Investigate BF <strong>vs</strong> <strong>Shod</strong> running patterns at longer<br />

distances


Directions for Further Research<br />

• Investigate injury rates in both BF <strong>and</strong> shod<br />

running populations<br />

• Investigate which body types <strong>and</strong> structures<br />

are most successful for both shod <strong>and</strong><br />

barefoot running<br />

• Role of BF/NHS running in injury prevention


Conclusions<br />

• Statistically Significant<br />

difference in IC-GRF between<br />

BF/<strong>Shod</strong> <strong>and</strong> HS/NHS<br />

• Further research needs to be<br />

completed before making<br />

large clinical decisions<br />

• This literature review is just<br />

one step towards<br />

underst<strong>and</strong>ing the vast<br />

differences between running<br />

barefoot <strong>and</strong> running shod<br />

http://www.goodhousekeeping.com/cm/goodhousekeeping/i<br />

mages/qZ/ghk-canyon-spotting-lg.jpg


Primary References<br />

1. Baur H, Divert C, Hirschmüller A, Müller S, Belli A, Mayer F. Analysis of gait differences in healthy runners<br />

<strong>and</strong> runners with chronic Achilles tendon complaints. Isokinetics & Exercise Science. 2004; 12(2): 111-6.<br />

2. De Wit B, De Clerq D, Aerts P. Biomechanical analysis of the stance phase during barefoot <strong>and</strong> shod<br />

running. Journal of Biomechanics. 2000; 33: 269-278.<br />

3. Dickinson JA, Cook SD, Leinhardt TM, The Measurement of shock waves following heel strike while<br />

running. J Biomech, 1985; 18 (6): 415-22.<br />

4. Divert C, Mornieux G, Baur H, Mayer F, Belli A. Mechanical Comparison of <strong>Barefoot</strong> <strong>and</strong> <strong>Shod</strong> <strong>Running</strong>. Int J<br />

Sports Med, 2005 Sep; 26(7): 593-8.<br />

5. Lieberman DE, Venkadesan M, Werbel WA, Daoud AI, D'Andrea S, Davis IS, Mang'Eni RO, Pitsiladis Y. Foot<br />

strike patterns <strong>and</strong> collision forces in habitually barefoot versus shod runners. Nature. 2010; 463(28): 531-<br />

535.<br />

6. Squadrone R, Gallozzi C. Biomechanical <strong>and</strong> physiological comparison of barefoot <strong>and</strong> two shod conditions<br />

in experienced barefoot runners. J Sports Med Phys Fitness. 2009 Mar;49(1):6-13.<br />

7. Hamill J, Russell EM, Gruber AH, Miller R. Impact characteristics in shod <strong>and</strong> barefoot running. Footwear<br />

Science 2011 March; 3: 33-40.


Secondary References<br />

• Belli A, Bui P, Berger A, Geyssant A, Lacour JR. A treadmill ergometer for three-dimensional ground reaction forces measurement during walking. J<br />

Biomech. 2001 Jan; 34: 105-12.<br />

• Baur H, Divert C, Hirschmüller A, Müller S, Belli A, Mayer F. Analysis of gait differences in healthy runners <strong>and</strong> runners with chronic Achilles tendon<br />

complaints. Isokinetics & Exercise Science. 2004; 12: 111-6.<br />

• Braunstein B, Arampatzis A, Eysel P, Brüggemann GP. Footwear affects the gearing at the ankle <strong>and</strong> knee joints during running. J Biomech. 2010 Aug<br />

10; 43: 2120-5.<br />

• Buist I, Bredeweg SW, Lemmink KA, van Mechelen W, Diercks RL. Predictors of running-related injuries in novice runners enrolled in a systematic<br />

training program: a prospective cohort study. Am J Sports Med. 2010 Feb; 38: 273-80.<br />

• Burkett LN, Kohrt WM, Buchbinder R. Effects of shoes <strong>and</strong> foot orthotics on VO2 <strong>and</strong> selected frontal plane knee kinematics. Med Sci Sports Exerc.<br />

1985 Feb;17: 158-63.<br />

• Cavanagh PR, Lafortune MA. Ground Reaction Forces in Distance <strong>Running</strong>. Journal of Biomechanics. 1980; 13: 397-406.<br />

• Chi KJ, Schmitt D. Mechanical energy <strong>and</strong> effective foot mass during impact loading of walking <strong>and</strong> running. J Biomech. 2005 Jul; 38: 1387-95.<br />

• Clinghan R, Arnold GP, Drew TS, Cochrane LA, Abboud RJ. Do you get value for money when you buy an expensive pair of running shoes? Br J Sports<br />

Med. 2008 Mar; 42: 189-93.<br />

• Cormittag K, Calonje R, Briner WW. Foot <strong>and</strong> ankle injures in the barefoot sports. Curr Sports Med Rep. 2009 Sep-Oct; 8: 262-6.<br />

• De Cock A, De Cercq D, Willems T, Wityrouw E. Temporal Characteristics of foot roll-over during barefoot jogging: reference data for young adults.<br />

Gait Posture. 2005 Jun; 21: 432-9<br />

• De Cock A, Vanrenterghem J, Willems T, Witvrouw E, De Clerq D. The trajectory of the centre of pressure during barefoot running as a potential<br />

measure for foot function. Gait <strong>and</strong> Posture. 2008; 27:669-675.<br />

• Dekel S, Weissman SL. Joint changes after overuse <strong>and</strong> peak overloading of rabbit knees in vivo. Acta Orthop Sc<strong>and</strong> 1978; 49: 519-28.<br />

• De Wit B, De Clerq D, Aerts P. Biomechanical analysis of the stance phase during barefoot <strong>and</strong> shod running. Journal of Biomechanics. 2000; 33: 269-<br />

278.<br />

• Dickinson JA, Cook SD, Leinhardt TM, The Measurement of shock waves following heel strike while running. J Biomech, 1985; 18: 415-22.<br />

• Divert C, Mornieux G, Baur H, Mayer F, Belli A. Mechanical Comparison of <strong>Barefoot</strong> <strong>and</strong> <strong>Shod</strong> <strong>Running</strong>. Int J Sports Med, 2005 Sep; 26: 593-8.<br />

• Edwards WB, Taylor D, Rudolphi TJ, et al. Effects of stride length <strong>and</strong> running mileage on a probabilistic stress fracture model. Med Sci Sports Exerc.<br />

2009 Dec; 41: 2177-84<br />

• Eslami M, Begon M, Farahpour N, Allard P. Forefoot-rearfoot coupling patterns <strong>and</strong> tibial internal rotation during stance phase of barefoot versus<br />

shod running. Clinical Biomechanics. 2007; 22: 74-80.


Secondary References<br />

• Fitzgerald M, http://running.competitor.com/2010/05/features/the-barefoot-running-injury-epidemic_10118, September 8 th , 2010.<br />

• Hamill J, Russell EM, Gruber AH, Miller R. Impact characteristics in shod <strong>and</strong> barefoot running. Footwear Science 2011 March; 3: 33-40.<br />

• Hanson NJ, Berg K, Deka P, Meendering JR, Ryan C. Oxygen Cost of <strong>Running</strong> <strong>Barefoot</strong> <strong>vs</strong>. <strong>Running</strong> <strong>Shod</strong>. Int J Sports Med. 2011 Apr 6. [Epub ahead of<br />

print]<br />

• Hewett TE, Myer GD, Ford KR, et al., Biomechanical measures of neuromuscular control <strong>and</strong> valgus loading of the knee predict anterior cruciate<br />

ligament injury risk in female athletes: a prospective study. Am J Sports Med. 2005 Apr; 33: 492-501.<br />

• Hreljac A. Impact <strong>and</strong> overuse injuries in runners. Med Sci Sports Exerc, 2004 May; 36: 845–9.<br />

• Jarvinen T, Kannus P, Maffulli N, et al., Achilles tendon disorders: etiology <strong>and</strong> epidemiology. Foot Ankle Clin, 2005; 10: 255-66.<br />

• Jenkins DW <strong>and</strong> Ross JA. Point-Counterpoint: <strong>Barefoot</strong> <strong>Running</strong>: Is it here to stay or just a passing fad? Podiatry Today. 2011 Apr; 24: 46-8, 50, 52.<br />

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Thank You<br />

• Diane Allen, PT, PhD<br />

• Arlene McCarthy, PT, DPT, MS, NCS<br />

• Ali Legakis, MS, DPT(c)<br />

• Emily Hellmuth, MS, DPT(c)<br />

• Pete Rumford, MS, DPT(c), CSCS<br />

• Sara Tanza, MS, DPT(c)<br />

• Naomi Hosking, MS, DPT(c)<br />

• Janeen Gray, MS, DPT(c)<br />

• UCSF/SFSU, DPT Class of 2011


Videos if Time Allows<br />

• <strong>Barefoot</strong> Kenyan runner<br />

• http://www.youtube.com/watch?v=pgkWhca<br />

pWLU

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