Below is the article that Podiatry Today had featured as an exclusive article to discuss the common concerns of running barefoot. The article had generated a lot of interest amongst my colleagues as well as many runners. For those who have not read it I am reposting here on my blog as well as the link to the original post by Podiatry Today.
Barefoot running, minimalist running, and natural running are all terms that describe running in a manner that allows our foot to function the way it was designed (or has evolved) through the use of little or no shoe at all. Many runners suffering from chronic injuries are adopting this way of running and are experiencing relief of symptoms to find themselves running with enjoyment and relaxing form. I too have been cured of a running injury that I suffered from for over 8 years after transitioning my gait to that of a “barefoot” runner. When I was asked to write this article I couldn’t wait to get the chance to share all of my research and experience on this rather “new” way of running. However, I only have 1500 words so without further do, here are the 10 myths of barefoot running.
- Stress Fractures: Without a doubt the most common concern with barefoot or minimalist running is the development of a stress fracture. While there have been documented cases of this in the literature, it occurs as a result of a change in activity without gradual adaptation and not directly related to the shoegear or lack of (1). We actually should see a decrease in the likelihood of stress fracture given the change in stride and cadence that one acquires while running in this manner (2). Stress fractures occur secondary to overuse without the body having adapted adequately, as proven by Wolff’s Law (3). In fact if we adhere to Wolff’s law, in theory we should see weaker bone trabecular patterns on those wearing cushioned running shoes due to decreased intrinsic muscle strength resulting in a proportional decrease in the force acting on the respective bone (4).
- I have flat feet and I need support: Lees and Klemerman have demonstrated that there is no correlation between foot type and running injuries, specifically with a pes planus deformity (5). During barefoot running we avoid heel striking and land more on our forefoot or midst foot. Once the forefoot strikes the ground, pronation of the entire foot begins (not isolated pronation of the subtalar joint) and continues until the point where the heel touches the ground. Arch height becomes irrelevant as does the commonly described concept of pronation with the heel striking the ground first. With a forefoot/midfoot strike, pronation is very beneficial and helps to absorb shock.
- I weigh too much: While a common excuse to not run, this does not hold true for reason enough to not run barefoot or in a minimalist shoe. Leiberman et al in 2010 were able to demonstrate that habitually unshod runners were able to generate smaller collision forces then shod heel strikers (6). In other words, by forefoot striking, we decrease the force that is transmitted through the lower extremity thereby reducing torque forces to the ankle, knee, and hip joints (7). Clearly we can see that if a person weigh 250 lbs, they would be placing more force through their joints by heel striking then by landing on their forefoot.
- I have bad knees: Osteoarthritis of the knee is a common concern amongst many runners, especially upper aged individuals who have run the majority of their lives. There are many theories as to why running is bad or even good for your knees. So many in fact that elliptical machines were invented to be used as a form of exercise similar to running without causing excess pressure to the joints (8). These “ellipticals” however do not reproduce anatomical motions and we see that when in vivo force analysis were performed there is less force with walking then with an elliptical trainer (9-11). As discussed previously we know that GRF are greater with heel strike as compared to unshod or barefoot runners who adapt a more forefoot strike pattern (6). Numerous studies have demonstrated higher GRF and mechanical stresses to the knee while running in traditional running shoes as opposed to barefoot(12-13). A recent study published in British Jounal of sports Medicine looked at subjects with knee osteoarthritis over 12 months and found no difference with wearing a lateral wedge orthotic vs a control flat insert (14). Similarly a systematic review of literature demonstrates that external knee adduction moment and pain associated with knee osteoarthritis is increased in individuals wearing sneakers as compared to barefoot walking (15).
- I can’t because I need to wear my orthotics: Orthotics have become more over utilized in the practice of podiatry then ever before. It is very common for me to see runners present in my office with plantar fasciitis, have a normal arch, wearing cushioned running shoes, and have been given orthotics. When running barefoot or in a minimalist shoe, we do not need to control motion at the rearfoot because heel striking is not occurring and “excessive pronation” as described by root does not occurr. While we have numerous studies that do not support the use of orthotics for running injuries alone, it becomes a challenge to convince the patient it is not needed (16-20).
- I have plantar fasciitis, this would be too painful: This article was not intended to discuss the pathomechanics or treatment options of plantar fasciitis, however, we are anecdotally seeing resolution of symptoms in those who adopt this style of running. One potentially explanation is the development in strength we see to the intrinsic musculature, specifically the abductor hallucis muscle which is a primary supporter of the arch (21-25). Another overlooked phenomenon is the fact that the majority of running shoes place your ankle into plantar flexion which forces the body to compensate by increasing lumbar lordosis as well as increasing pressure to the heel as opposed to more evenly distributed throughout the foot.
- My fat pad is atrophied: This is another common myth that patients acquire from various sources, including medical professionals. Most, if not all, of us have experienced a patient who complains of forefoot pain or calluses and then simply blame the problem on lack of adipose tissue or cushioning below the metatarsal heads. While those seems a possible etiology, to date we have no evidence that the fat pad of the sole of our foot actually atrophies on the forefoot or the heel region (26,27). With common forefoot pathology such as hammertoe deformities, we do see the fat pad migrate distally producing more prominent metatarsal heads, but typically this is in severe cases, ie rheumatoid arthritis (28). Patients at this stage of a deformity are typically not runners.
- You will get severe calluses: Calluses on our feet form as a result of shear fore on the plantar surfaces of the skin that produces excess friction. Shear force that occurs in the horizontal plane is the key to understanding this. Direct pressure does not produce calluses or we would see a high preponderance of heel calluses in runners as the majority of runners heel strike. Root discussed the formation of forefoot calluses secondary to shearing forces associated with propulsion as well as to the central metatarsals due to increased loading for an excessive period of time and abnormal shear (29). Root’s observations hold true for someone who heel strikes when running, as we see increased force placed upon the forefoot during what he described as the propulsion phase. Observation of the gait of barefoot runner or one that strikes with the forefoot/midfoot demonstrates that the propulsion phase as described by root becomes very minimal in existence if even at all. Good Form Running in association with New Balance provides training to adopt this style of running and we can see that by developing forward momentum, we carry the contralateral limb forward instead of pro-pulsing with the forefoot (30). By doing this we decrease the force present to the forefoot, especially the shear force. Not only is this beneficial for reduction of the shear force, but we see a decrease in the ground reactive forces acting on the 1st MPJ which can reduce sesamoiditis.
- I run long distance and can’t do that barefoot: What many of us fail to realize is that we have been running for thousands of years and without going into the debatable discussion of evolution, we know that early runners began running either barefoot or with very minimal shoegear such as moccasins (31). In 1960, Abebe Bikila won the Olympic Marathon in a record time of 2:15:16.2 while running barefoot (32). Zola Budd recorded numerous middle distance world records while running barefoot in the 1980s. Ken Saxton (well known among the sub cultural of barefoot runners) finished 14 marathons in 2006 unshod, and has since completed a total of 56 marathons, including Boston, all while running barefoot (33).
- You could step on glass: Finally, my favorite. Numerous times I am asked the question of “what happens if you step on glass?” while lecturing and debating this topic amongst medical professionals as well as early adopters to this style of running. My answer, “Don’t step on glass.” This concept of “barefoot running” is not about what you are wearing on your foot, it is about HOW you are running and allowing the foot to perform they way it was designed and intended to. Once the form is perfected and heel strike is abandoned (which can typically be learned on a treadmill barefoot), the next step is to protect the skin of our foot while not compromising the proprioceptive feedback from ground.
There are numerous options available which have recently become known as Minimalist Shoegear. Vibram FiveFingers, The New Balance Minimus, and the Merrerl Trailglove to name a few. FiveFingers has quickly become the leader of the market share due to its ability to allow the toes to function individually and allowing full range of motions of the forefoot, as well as the midfoot and rearfoot joints with a zero drop (34). Nike as well was one of the very first to introduce a less supportive shoe in 2004 known as The Nike Free (35). While this is a very flexible and non-supportive shoe, it does have a considerable amount of cushioning which can interfere with feedback and increase muscle recruitment to provide control.
In summary, barefoot running is about learning to run the way our body was intended to using the foot as an ideal shock absorber and not relying on a shoe that compromises the anatomical position of the foot placing one at risk for injury. Using a true minimalist running shoe can achieve this and still protect the foot from the environmental dangers.
- Giuliani J, Masini B, Alitz C, Owens BD. Barefoot-simulating footwear associated with metatarsal stress injury in 2 runners. Orthopedics. 2011 Jul 7;34(7):e320-3. doi: 10.3928/01477447-20110526-25.
- Edwards WB, Taylor D, Rudolphi TJ, Gillette JC, Derrick TR. Effects of stride length and running mileage on a probabilistic stress fracture model. Med Sci Sports Exerc. 2009 Dec;41(12):2177-84.
- Stedman’s Medical Dictionary. Definition of Wolff’s Law.
- Wolff J. “The Law of Bone Remodeling”. Berlin Heidelberg New York: Springer, 1986 (translation of the German 1892 edition)
- Lees A, Lake M, Klenerman L. Shock absorption during forefoot running and its relationship to medial longitudinal arch height. Foot Ankle Int. 2005 Dec;26(12):1081-8.
- Lieberman DE, Venkadesan M, Werbel WA, Daoud AI, D’Andrea S, Davis IS, Mang’eni RO, Pitsiladis Y. Foot strike patterns and collision forces in habitually barefoot versus shod runners. Nature. 2010 Jan 28;463(7280):531-5.
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- Lu TW, Chien HL, Chen HL. Joint loading in the lower extremities during elliptical exercise. Med Sci Sports Exerc. 2007 Sep;39(9):1651-8.
- D’Lima DD, Steklov N, Patil S, Colwell CW Jr. The Mark Coventry Award: in vivo knee forces during recreation and exercise after knee arthroplasty. Clin Orthop Relat Res. 2008 Nov;466(11):2605-11. Epub 2008 Jun 19.
- Franz JR, Dicharry J, Riley PO, Jackson K, Wilder RP, Kerrigan DC. The influence of arch supports on knee torques relevant to knee osteoarthritis. Med Sci Sports Exerc. 2008 May;40(5):913-7.
- Burkett LN, Kohrt WM, Buchbinder R. Effects of shoes and foot orthotics on VO2 and selected frontal plane knee kinematics. Med Sci Sports Exerc. 1985 Feb;17(1):158-63.
- Bennell KL, Bowles KA, Payne C, Cicuttini F, Williamson E, Forbes A, Hanna F, Davies-Tuck M, Harris A, Hinman RS. Lateral wedge insoles for medial knee osteoarthritis: 12 month randomised controlled trial. BMJ. 2011 May 18;342:d2912. doi: 10.1136/bmj.d2912.
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