Email updates

Keep up to date with the latest news and content from JNER and BioMed Central.

Open Access Short report

Asymmetrical slip propensity: required coefficient of friction

Jung-suk Seo1 and Sukwon Kim2*

Author Affiliations

1 Division of Sports Science, College of Natural Science, WonKwang University, Iksan-si, Jeollabuk-do, South Korea

2 Department of Physical Education, College of Education, Chonbuk National University, Jeonju-si, Jeollabuk-do, South Korea

For all author emails, please log on.

Journal of NeuroEngineering and Rehabilitation 2013, 10:84  doi:10.1186/1743-0003-10-84

Published: 31 July 2013



Most studies in performing slips and falls research reported their results after the ipsilateral leg of subjects (either right foot or left foot) was guided to contact the contaminated floor surface although many studies indicated concerns for asymmetries of legs in kinematic or kinetic variables. Thus, the present study evaluated if dominant leg’s slip tendency would be different from non-dominant leg’s slip tendency by comparing the Required Coefficient of Friction (RCOF) of the two lower limbs.


Forty seven health adults participated in the present study. RCOF was measured when left or right foot of subjects contacted the force platforms respectively. Paired t-test was performed to test if RCOF and heel velocity (HCV) of dominant legs was different from that of non-dominant legs. It was suggested that the asymmetry in RCOFs and HCV between the two lower limbs existed. The RCOFs of non-dominant legs were higher than that of dominant legs.


The results indicated that asymmetry in slip propensity, RCOF, was existed in lower extremity. The results from the study suggested that it would be benefit to include a variable, such as asymmetry, in slips and falls research.

Gait asymmetry; RCOF; Slip propensity; Limb asymmetry; Gait kinetics