Foot structure and static balance

“Balance is not something you find, it is something you create” – Buddha

The purpose of the foot in an upright biped is to control and direct body weight in static and dynamic activity. Static balance is important in tasks of daily living as well as fitness activities such as yoga, and is a powerful predictor of falling risk in old age (Gehlsen, 1990). The shape and structure of the foot, in particular the position and function of the big toe, is crucial in this regard.

Single-leg balance is characteristic of key yoga poses and is a simple test regularly used in clinical settings to detect balance impairment (Gehlsen, 1990). Studies examining the determinants of single-leg static balance show the engagement of the big toe with the ground to be the most important determinant of postural control (Tanaka et al., 1996; Saeki, 2015). Morton (1935) showed a valgus (squashed in) position of the big toe impaired postural control, and Chou et al.(2009) showed that removing the big toe from the ground dramatically impaired static balance.

Deformity of the big toe is a common disorder affecting around 23% of 18-65 year olds and over 36% of those over 65 years old (Nix et al., 2010). It is linked to years of wearing shoes with restricted toe boxes (Munteanu et al., 2017), but can be reversed by wearing anatomically-shaped shoes that allow restoration of natural toe position and function (Knowles, 1953). The logic is therefore clear, to improve your balance, choose anatomically-shaped shoes and fix your feet.

 

 

References:

Chou S, Cheng HY, Chen JH, Ju YY, Lin YC, Wong MK: The role of the great toe in balance performance. J Orthop Res 27: 549-554, 2009.

Gehlsen GM, Whaley MH: Falls in the elderly: Part II: Balance, strength, and

flexibility. Arch Phys Med Rehabil 71: 739-741, 1990.

Knowles FW: Effects of shoes on foot form: An anatomical experiment. Med J Aust 1: 579-581, 1953.

Morton, D.J. The Human Foot: its evolution, physiology and functional disorders. New York: Columbia University Press; 1935.

Munteanu SE, Menz HB, Wark JD, Christie JJ, Scurrah KJ, Bui M, Erbas B, Hopper JL, Wluka AE: Hallux valgus, by nature or nurture? A twin study. Arth Care & Res 69: 1421-1428, 2017.

 Nix S, Smith M, Vicenzino B: Prevalence of hallux valgus in the general population: a systematic review and meta-analysis. J Foot & Ank Res 3: 21.

Saeki J, Tojima M, Torii S: Clarification of functional differences between the hallux and lesser toes during the single leg stance: immediate effects of conditioning contraction of the toe plantar flexion muscles. J Phys Ther Sci 27: 2701-2704, 2015.

Tanaka T, Hashimoto N, Nakata M, Ito T, Ino S, Ifukube T: Analysis of toe pressures under the foot while dynamic standing on one foot in healthy subjects. J Orth & Sports Phys Ther 23: 188-193, 1996.

 

 

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