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The Science of Running Shoes

Revision as of 12:45, 30 December 2015 by User:Fellrnr (User talk:Fellrnr | contribs)

Revision as of 12:45, 30 December 2015 by User:Fellrnr (User talk:Fellrnr | contribs)

The design of most running shoes does not match the available science, and understanding this will help you know What to Look for in Running Shoes. The commonly held beliefs follow this logic: Runners get injured due to impact and excessive Pronation, running shoes reduce impact and pronation, and therefore running shoes reduce injury. Unfortunately, every part of this rationale seems to be flawed. There are other aspects of shoe design, such as the raise heel or arch support that have even less evidence to support them.

  • Injuries due to impact. There is surprisingly little evidence that impact forces cause injuries, and there is even some evidence that lower impact forces are associated with higher injury rates. It's been suggested that excessive impact can result in injury, while more moderate impact can produce important adaptations that are necessary for improved performance.
  • Injuries due to over pronation. The science around Pronation and injury rates is quite mixed. Part of the problem is science does not generally look at pronation directly, but uses arch height with the assumption that low arches pronate more. There is some evidence that high or low arches have slightly higher injury rates, or that different arch heights have different patterns of injury.
  • Running shoes reduce impact. There is good evidence that increased cushioning does not reduce impact forces. Runners who normally run in shoes will have higher impact when initially running barefoot, but after adaptation the impact forces are actually lower without shoes.
  • Running shoes reduce pronation. Motion control shoes (the highest level of anti-pronation) only reduce pronation by about 1.5% when compared with a simple cushioned shoe. It seems unlikely that this is enough to produce any real-world effect.
  • Running shoes reduce injury. There is no evidence that running shoes reduce injury rates. Assigning shoes based on arch height does not change injury rate, nor is there any indication that more cushioned shoes have a lower injury rates. There is some evidence that motion control shoes cause greater leg pain and more training days lost, and this applies to all arch types.
  • Raised heel. Another common feature of running shoes is a raised heel, which is intended to reduce the strain on the Achilles tendon. However there is little evidence that the raised heel actually reduces the strain on the Achilles tendon, and no evidence that the raised heel actually reduces Achilles tendon injuries.
  • Arch support. Often running shoes have a raised area under the arch that is intended to provide support. I found no evidence to support this idea.
  • Barefoot running. The reduced impact seen with barefoot running led many people (myself included) to believe that this would in turn result in lower injury rates. However, there is no evidence that barefoot runners have a lower injury rates. More importantly, there is a growing body of evidence to suggest that the transition to barefoot running is associated with a high injury risk.

Contents

1 The Myth of Running Shoe Types

There is good evidence to support the widely held belief that injury rates among runners are quite high, with estimates of injury rates varying between 20% and 80% of runners[1]. It is widely assumed that impact forces and excessive pronation cause running injuries, and that running shoes are designed to alleviate these problems[2][3][4][5][6][7]. This leads to the common recommendation that different types of shoes should be recommended based on a runners arch height. In fact, REI[8], Zappos[9], Runners' World[10], and Road Runner Sports[11] all include this advice.

This image probably originated with the "The Running Shoe Book"[12].

2 Impact & Injury

The relationship between impact and injury is less clear than one might suppose. It has been suggested that while excessive impact can result in injury, lower levels of impact are the stimulus for improved strength and performance[13][14].

Footstrike impact metrics.

There are various ways of evaluating impact, and not all studies use the same metric or are not clear on which metric is used.

  • Active Peak is the greatest force or acceleration detected during foot strike.
  • Peak Impact is the greatest force seen during the initial landing.
  • Loading Rate is how rapidly the forces build up and can either be averaged over parts of this section of the graph or an instantaneous peak can be used. (That would be peak rate of change of impact, not peak impact.)
  • In addition, impact is sometimes normalized to body weight.

There is evidence that the impact seen in running does not result in injury:

  • Impact forces are not related to injury rates in epidemiologic studies[14].
  • A study of three runners found that impact forces at the heel are not related to the forces at common injury sites such as the ankle, Achilles, or knee[15].
  • A study of 131 runners showed that injury rates were highest in those with the lowest impact levels[16].
  • The impact forces of 210 notice runners were evaluated for the symmetry of their impact forces and their subsequent injury rates[17]. The injured runners had greater symmetry than the uninjured, and there was no difference between the impact forces on the injured side compared with the uninjured side. (However, see the results on the companion study below).
  • Another study of the 210 notice runners mentioned above found that Loading Rate was related to the injury rate of male (but not female) runners, though the female runners had a higher Loading Rate than the males[18]. However, when time spend running was considered, the relationship between Loading Rate and injury disappeared.
  • A review of the available research in 2007 found no relationship between impact and injury rates[1].
  • A review of the available research in 1992 found no evidence that injury rates were related to hard or soft surfaces[19]. (Of course, you can't assume too much about the impact rates from the surface.)

However, there is also some evidence of a relationship between higher impact and injury:

  • A study that compared 20 runners who had never been injured with 20 runners that had prior injuries found that peak impact rates were higher in those that had been previously been injured[20].
  • A study of five female runners who had previously had a stress fracture showed higher peak impact forces than subjects without stress fractures[21].
  • A meta-analysis of 13 studies found that while there was no correlation between rates of stress fracture and impact, there was a relationship for the rate of loading[22].
  • A study of 20 female runners with a previous tibial stress fracture showed they had high rates of impact, but not greater peak impact than matched controls[23].

It seems possible that Loading Rate is related to stress fractures, but it seems unlikely that impact is related to other injury types. (It's estimated that stress fractures account for 0.7% to 20% of clinical injuries[24].)

3 Pronation, Arch Height & Injury

The evidence for the correlation between pronation and injury is rather mixed. This is compounded by the use of arch height as a proxy for pronation.

  • An analysis of 29 studies showed that high or low arched feet had slightly higher risk of injury than normally arched feet[25].
  • There is also evidence for the opposite conclusion, where high or low arched feet have a lower risk of injury[26].
  • One study found that while injury rates are the same for different arch heights, the location of the injuries varies with arch height[27].
  • Another study found that while injury rates are similar for different arch heights, those with low arches had more expensive injuries[28]. (This was a study in the military, where such expenditure is more easily tracked.)
  • A year-long study of 927 novice runners showed no correlation between arch height and injury rates[29].
  • A study of 1597 runners found that those with the lowest arches were 2.7x more likely to have knee (patellofemoral) pain than those with the highest arches[30]. (Note that this study used navicular drop as an indicator of pronation, but other factors contribute significantly to navicular drop[31].)
  • A retrospective study found that arch height was not different between runners who had previously been injured and those that had never been injured[20].
A graph of peak vertical impact force and the frequency of running-related injuries[16].

4 Running Shoes & Impact

There is good evidence that increased cushioning does not reduce impact[32][33][34][35]. However, runners who normally run in shoes have greater impact forces when running barefoot, but this is reversed with barefoot experience[32][36][37].

5 Running Shoes & Pronation Control

The evidence indicates that even Motion Control shoes can only reduce pronation by around 1.5%, which is unlikely to be enough to make any real-world difference.

  • A meta-analysis of 5 studies showed that motion control shoes can reduce pronation when compared with barefoot or simple cushioned shoes, but only by about 2%[38].
  • A study compared a Motion Control shoe (MC) with a Cushioned shoe (CT) with 20 high arched (HA) and 20 low arched (LA) runners[39]. The motion control shoe was the New Balance 1122 and the cushioned shoe was the New Balance 1022. The change in pronation (in degrees) is shown below.
CT MC Change
LA 7.9 6.3 1.6
HA 8.0 7.4 0.6
  • A study of 10 male runners compared "normal" running shoes with and without a 10 degree orthotic wedge showed the orthotic reduced pronation by 6.7 degrees[40].
  • A study of 25 inexperienced, over-pronating female runners looked at differences in pronation in motion control and cushioned shoes, before and after a 1.5 Km (~1 mile) run[41]. These runners only averaged 2.1 Km (1.3 miles) per week and had pronation of more than 6 degrees. The Motion Control shoes reduced pronation by 3.3 degrees before the run, but after just this short run the Motion Control shoes made no difference. The motion control shoes were Adidas Supernova Control and the cushioned shoes were Adidas Supernova Cushion. The results are shown below:
CT MC Change
Before 1.5 Km run 13.9 10.6 3.3
After 1.5 Km run 17.7 17.7 0
  • A study of 10 experienced rear foot runners were tested with shoes of varying heel flare[42]. This heel flare is how much wider the heel is at the bottom than the top, and the flared heels reduced pronation from 12.6 to 11.1 degrees (1.5 degree decrease) when compared with any heel without any flare. In practice, it's rare for a shoe to be this narrow at its base, and other studies have not shown this effect[43][44].
    Clarke-1983-Heel-Flare.jpg
  • The heel counter is intended to link the heel of the foot to the shoe, but a study found that a rigid heel counter did not prevent slippage within the shoe any better than a flexible heel counter[45]. Also, the pronation of the foot can be twice as large as the pronation when measured on the shoe[44].
  • A study of 7 people compared pronation when stepping down from a platform in shoes and when barefoot[46]. The shoe was the Adidas Response Cushion and the platform was 4 inches/10 cm high. Pronation with shoes was less (17.9 degrees) than when barefoot (20.5 degrees). However, because the reduction was so small, the study concluded that it was impractical to alter pronation with this type of footwear.

6 Running Shoes & Achilles Strain

A common feature in running shoes is for the heel to be thicker than the forefoot, something that is commonly called "drop". In the 1980's a drop of 12-15mm was recommended to prevent Achilles tendon and calf injuries[47], but there is little evidence to support this:

  • No studies have shown raised heels reduce Achilles (or other) injuries[1].
  • Shoes with the different levels of a drop do not change the range of motion of the ankle during running[48].
  • A study of five runners, each running in five different shoes with heel heights of 2.1-3.3cm (5.0 to 9.5 degrees) did not support the idea that heel height changes stress on the Achilles' tendon[48].
  • A study looked at 30 runners that were either assigned a minimal drop shoe (4mm) or were trained to adopt a midfoot strike (MFS) pattern[49]. The minimal drop shoe reduced heel impact, but the MFS training had no effect.
  • A study looked at 12 Rear Foot Strike runners using 16 combinations of midsole thickness and drop[50]. The lower drop shoes had a more midfoot strike pattern, but the thickness had no impact. (Ground contact time was greater with lower drop shoes.)
  • A study of 12 male runners looked at foot strike for shoes with 0mm, 4mm, and 8mm of drop, plus barefoot[51]. The barefoot condition was midfoot strike rather than rear foot strike in the shoes. The different drop conditions were not significantly different, though there was a trend towards more rear foot strike with the 8mm drop than with 0mm and 4mm drops.
  • A drop of 15mm or 7.5mm did not produce a significant reduction in Achilles tendon stress[52].

7 Injury Rates & Shoes

Several studies have found there is no evidence to support the idea that running shoes can reduce injury rates[53][1][19].

  • A study of 247 runners over 5 months showed no difference in injury rates between firm and softly cushioned shoes[54].
  • Three studies compared evaluated the idea that shoe type should be determined by arch height[55]. Runners were put into two groups, with one group assigned shoes based on the shape of the arch, and the other group just assigned a stability shoe regardless of their arch. These studies found no difference in injury rates. The studies were done by the US Army (2168 men, 951 women), Air Force (1955 men, 718 women), and Marine Corps (840 men, 571 women).
  • A study of 81 women training for a half marathon were randomly assigned cushioned, stability and motion control shoes[56]. The cushioned shoe was a Nike Pegasus, the stability was Nike Structure Triax, and the motion control was Nike Nucleus. The runners were then analyzed based on their arch height.
    • The study found that the motion control shoe was associated with the highest levels of pain while running for all foot types, though the difference was only significant for the neutral and pronated foot types.
    • All the highly pronated runners wearing the motion control shoe missed a training day due to pain, the highest proportion of any of the subgroups.
    • The neutral runners had higher levels of pain in the neutral shoe than the stability shoe. The pronating runners had higher levels of pain in the stability shoe than the neutral shoe. This is the opposite of most recommendations for shoe and foot type.
    • Note that while the overall sample size was reasonable (81), each individual subgroup was quite small (5 to 18 runners) and variation within subgroup of results was large. The subgroups also varied significantly in weight, BMI, age, and years of running experience.

8 Shoes and Running Economy

Main article: The Science of Running Economy

Studies have consistently shown that heavier shoes reduce running economy[57][58][59][60]. Each 100g/3.5oz added to the weight of each shoe reduces running economy by about 1%[61][60][62][63]. Studies of cushioning and Running Economy have provided conflicting information. I believe this conflict is due to some studies using a cushioned treadmill to compare barefoot and shod conditions. Not surprisingly, if a study uses a cushioned treadmill, the cushioning provided by the shoe does not confer any additional advantage over the barefoot condition. Analyzing the research, I conclude that a well cushioned running shoe can improve Running Economy by an estimated 2-3.5% compared with a weight matched un-cushioned shoe[61][60][64]. Note that running shoes provide less cushioning in colder temperatures[65].

9 Minimalist & Barefoot Running

Most research looks at factors that might be related to injury risk, rather than injury rates directly. I found no studies that evaluated barefoot or minimalist running and injury rates. So while barefoot and minimalist running tends to have lower impact, it's unclear if this will have any bearing on injury rates. Of greater concern is some compelling evidence that the transition to barefoot or minimalist footwear is correlated with higher injury rates, especially stress fractures in the foot.

  • A review of 23 studies found moderate evidence for higher Cadence and lower impact, but noted a lack of high quality evidence[66]. Examples include:
    • Barefoot running can produce reduce impact forces compared with cushioned shoes[36]
    • Shoes increase Ground Contact Time compared with barefoot[67].
    • Compared with barefoot, running shoes reduced the ability to estimate surface angle, with a greater estimation error with thicker shoes[68][69].
  • There are some instances of Metatarsal Stress fractures in runners who had changed to minimalist shoes, with no other changes in their training habits[70].
  • A study of 99 runners were randomly assigned a traditional cushioned shoe (Nike Pegasus), partial-minimalist shoes (Nike Free 3.0 V.2) or minimalist shoes (Vibram 5-Finger Bikila)[71]. The runners had a minimum of 5 years' experience and had no injuries in the previous 6 months. The runners took part in a 12 week training program in which they gradually adopted their assigned footwear. They increased their time in the assigned footwear from 10 min (19%) in week 1 to 115 min (58%) in week 12.
    • Runners in the traditional shoes had a lower incident of injury (#4/32 runners) than the partially minimalist (#12/32 runner) or minimalist (#7/35 runners).
    • The only statistically significant difference in pain scores for the shoe conditions was in shin and calf pain, with runners in the partially minimalist and minimalist shoes having greater pain scores than the traditional shoes. However, the underlying data is a little more complex. Below are shown the pain scores before and after the trial for each shoe type. As you can see, the pain goes up by the greatest percentage for the partially minimalist, but this rise is from a much lower initial level. The absolute level of pain is lowest for the partially minimalist condition, making this study tricky to interpret.
Time Traditional Partial Minimalist Minimalist
Baseline 7.3 (9.7) 4.9 (6.8) 5.3 (11.8)
12 weeks 18.4 (13.9) 13.9 (9.6) 28.8 (22.3
  • A study looked at bone marrow edema in 36 experienced runners transitioning to Vibram FiveFingers (VFF) shoes[72]. The runners were randomly assigned VFF or their normal running shoes, with the VFF runners gradually transitioning based on the recommendations of Vibram at that time. Only 1 of the 17 runners in the control group showed signs of a bone marrow edema, compared with 9 of the 19 VFF runners.
  • In 2014, Vibram settled a lawsuit that they made false and unsubstantiated claims that their FiveFingers shoes could reduce injury rates.

10 References

<references> [53][47][48][67][52][68][69][54][29][29][19][2][15][3][4][31][30][14][16][5][6][7][1][55][27][28][20][26][25][38][56][70][36][66][71][72][48][32][36][37][33][34][35][8][9][10][11][12][13][21][22][49][50][39][40][41][42][43][44][45][46][51][64][57][58][59][60][61][63][62][65][23][19][18][17][24]

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  46. ↑ 46.0 46.1 Mako Fukano, Toru Fukubayashi, Changes in talocrural and subtalar joint kinematics of barefoot versus shod forefoot landing, Journal of Foot and Ankle Research, volume 7, issue 1, 2014, pages 42, ISSN 1757-1146, doi 10.1186/s13047-014-0042-9
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  48. ↑ 48.0 48.1 48.2 48.3 C. Reinschmidt, BM. Nigg, Influence of heel height on ankle joint moments in running., Med Sci Sports Exerc, volume 27, issue 3, pages 410-6, Mar 1995, PMID 7752869
  49. ↑ 49.0 49.1 M. Giandolini, N. Horvais, Y. Farges, P. Samozino, JB. Morin, Impact reduction through long-term intervention in recreational runners: midfoot strike pattern versus low-drop/low-heel height footwear., Eur J Appl Physiol, volume 113, issue 8, pages 2077-90, Aug 2013, doi 10.1007/s00421-013-2634-7, PMID 23584279
  50. ↑ 50.0 50.1 N. Horvais, P. Samozino, Effect of midsole geometry on foot-strike pattern and running kinematics, Footwear Science, volume 5, issue 2, 2013, pages 81–89, ISSN 1942-4280, doi 10.1080/19424280.2013.767863
  51. ↑ 51.0 51.1 N. Chambon, N. Delattre, E. Berton, N. Guéguen, G. Rao, The effect of shoe drop on running pattern, Computer Methods in Biomechanics and Biomedical Engineering, volume 16, issue sup1, 2013, pages 97–98, ISSN 1025-5842, doi 10.1080/10255842.2013.815919
  52. ↑ 52.0 52.1 Dixon, Sharon J., and David G. Kerwin. "The influence of heel lift manipulation on Achilles tendon loading in running." Journal of Applied Biomechanics 14 (1998): 374-389.
  53. ↑ 53.0 53.1 C E Richards, P J Magin, R Callister, Is your prescription of distance running shoes evidence-based?, British Journal of Sports Medicine, volume 43, issue 3, 2009, pages 159–162, ISSN 0306-3674, doi 10.1136/bjsm.2008.046680
  54. ↑ 54.0 54.1 D. Theisen, L. Malisoux, J. Genin, N. Delattre, R. Seil, A. Urhausen, Influence of midsole hardness of standard cushioned shoes on running-related injury risk, British Journal of Sports Medicine, volume 48, issue 5, 2013, pages 371–376, ISSN 0306-3674, doi 10.1136/bjsports-2013-092613
  55. ↑ 55.0 55.1 Joseph J. Knapik, Daniel W. Trone, Juste Tchandja, Bruce H. Jones, Injury-Reduction Effectiveness of Prescribing Running Shoes on the Basis of Foot Arch Height: Summary of Military Investigations, Journal of Orthopaedic & Sports Physical Therapy, volume 44, issue 10, 2014, pages 805–812, ISSN 0190-6011, doi 10.2519/jospt.2014.5342
  56. ↑ 56.0 56.1 M. B. Ryan, G. A. Valiant, K. McDonald, J. E. Taunton, The effect of three different levels of footwear stability on pain outcomes in women runners: a randomised control trial, British Journal of Sports Medicine, volume 45, issue 9, 2010, pages 715–721, ISSN 0306-3674, doi 10.1136/bjsm.2009.069849
  57. ↑ 57.0 57.1 T. Lussiana, N. Fabre, K. Hébert-Losier, L. Mourot, Effect of slope and footwear on running economy and kinematics, Scandinavian Journal of Medicine & Science in Sports, volume 23, issue 4, 2013, pages e246–e253, ISSN 09057188, doi 10.1111/sms.12057
  58. ↑ 58.0 58.1 LN. Burkett, WM. Kohrt, R. Buchbinder, Effects of shoes and foot orthotics on VO2 and selected frontal plane knee kinematics., Med Sci Sports Exerc, volume 17, issue 1, pages 158-63, Feb 1985, PMID 3982270
  59. ↑ 59.0 59.1 S. Sobhani, S. Bredeweg, R. Dekker, B. Kluitenberg, E. van den Heuvel, J. Hijmans, K. Postema, Rocker shoe, minimalist shoe, and standard running shoe: a comparison of running economy., J Sci Med Sport, volume 17, issue 3, pages 312-6, May 2014, doi 10.1016/j.jsams.2013.04.015, PMID 23711621
  60. ↑ 60.0 60.1 60.2 60.3 The separate effects of shoe mass and cushioning on the energetic cost of barefoot vs. shod running. Wierzbinski, Corbyn. University of Colorado at Boulder. Departmental Honors Thesis. http://digitool.library.colostate.edu///exlibris/dtl/d3_1/apache_media/L2V4bGlicmlzL2R0bC9kM18xL2FwYWNoZV9tZWRpYS8xMTkyODM=.pdf
  61. ↑ 61.0 61.1 61.2 JR. Franz, CM. Wierzbinski, R. Kram, Metabolic cost of running barefoot versus shod: is lighter better?, Med Sci Sports Exerc, volume 44, issue 8, pages 1519-25, Aug 2012, doi 10.1249/MSS.0b013e3182514a88, PMID 22367745
  62. ↑ 62.0 62.1 Frederick , E. C. The energy cost of load carriage on the feet during running. In: Winter, D.A., R. W. Norman, R. P. Wells, K. C. Hayes, and A. E. Patla (Editors), Biomechanics IX-B Human Kinetics Publ., Champaign, IL, pp.295-300, 1985
  63. ↑ 63.0 63.1 Frederick, E. C., Physiological and ergonomics factors in running shoe design. Applied Ergonomics 15(4): 281-287, 1984
  64. ↑ 64.0 64.1 KD. Tung, JR. Franz, R. Kram, A test of the metabolic cost of cushioning hypothesis during unshod and shod running., Med Sci Sports Exerc, volume 46, issue 2, pages 324-9, Feb 2014, doi 10.1249/MSS.0b013e3182a63b81, PMID 24441213
  65. ↑ 65.0 65.1 Mansour Y Dib, Jay Smith, Kathie A Bernhardt, Kenton R Kaufman, Kevin A Miles, Effect of Environmental Temperature on Shock Absorption Properties of Running Shoes, Clinical Journal of Sport Medicine, volume 15, issue 3, 2005, pages 172–176, ISSN 1050-642X, doi 10.1097/01.jsm.0000165348.32767.32
  66. ↑ 66.0 66.1 K. P. Perkins, W. J. Hanney, C. E. Rothschild, The Risks and Benefits of Running Barefoot or in Minimalist Shoes: A Systematic Review, Sports Health: A Multidisciplinary Approach, volume 6, issue 6, 2014, pages 475–480, ISSN 1941-7381, doi 10.1177/1941738114546846
  67. ↑ 67.0 67.1 B. Braunstein, A. Arampatzis, P. Eysel, GP. Brüggemann, Footwear affects the gearing at the ankle and knee joints during running., J Biomech, volume 43, issue 11, pages 2120-5, Aug 2010, doi 10.1016/j.jbiomech.2010.04.001, PMID 20462583
  68. ↑ 68.0 68.1 K. Sekizawa, MA. Sandrey, CD. Ingersoll, ML. Cordova, Effects of shoe sole thickness on joint position sense., Gait Posture, volume 13, issue 3, pages 221-8, May 2001, PMID 11323228
  69. ↑ 69.0 69.1 S. Robbins, E. Waked, J. McClaran, Proprioception and stability: foot position awareness as a function of age and footwear., Age Ageing, volume 24, issue 1, pages 67-72, Jan 1995, PMID 7762465
  70. ↑ 70.0 70.1 Jeffrey Giuliani, Brendan Masini, Curtis Alitz, Brett D. Owens, Barefoot-simulating Footwear Associated With Metatarsal Stress Injury in 2 Runners, Orthopedics, 2011, ISSN 0147-7447, doi 10.3928/01477447-20110526-25
  71. ↑ 71.0 71.1 M. Ryan, M. Elashi, R. Newsham-West, J. Taunton, Examining injury risk and pain perception in runners using minimalist footwear, British Journal of Sports Medicine, volume 48, issue 16, 2013, pages 1257–1262, ISSN 0306-3674, doi 10.1136/bjsports-2012-092061
  72. ↑ 72.0 72.1 Sarah T. Ridge, A. Wayne Johnson, Ulrike H. Mitchell, Iain Hunter, Eric Robinson, Brent S. E. Rich, Stephen Douglas Brown, Foot Bone Marrow Edema after a 10-wk Transition to Minimalist Running Shoes, Medicine & Science in Sports & Exercise, volume 45, issue 7, 2013, pages 1363–1368, ISSN 0195-9131, doi 10.1249/MSS.0b013e3182874769
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