Barefoot vs. Shod Running - Physical Therapy and Rehabilitation ...
Barefoot vs. Shod Running - Physical Therapy and Rehabilitation ...
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 />
• Jungers WL. Biomechanics: barefoot running strikes back. Nature. 2010; 62: 433-434.<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