Biofeedback Insole Usage Produces Improved Gait Kinematics

Rearfoot Motion Observations using a FootTrak Data Collection System


Following is Pilot Study data collected in an effort to observe trends and assist in refining data collection protocols for larger scale studies. Within this Appendix you will find the summary data provided by:


1) Rearfoot Kinematic Analysis of the Foot/Shank using a FootTrak motion capture device


a. Objective: To observe hypothesized changes in rearfoot kinematics of the foot and shank associated with the use of the BAREFOOTSCIENCE™ insole product.


b. Design: A Pilot Cohort study introducing the use of the BAREFOOTSCIENCE™ (aka DynaPro) insole technology as an independent variable.


c. Participants: N=1 adult male aged 36 of medium activity level and non symptomatic for foot pathologies.


d. Methods: Data was collected using a FootTrak motion analysis system. The test subject was asked to run on a treadmill at a speed determined by the subject to be a comfortable 5Km pace (10.5km/h) and data was collected in 5 different running shoes, with their original insoles and replaced with the BAREFOOTSCIENCE™ insole product using level 3 of the Barefoot Science progressive insole system.


e. Outcome measures: Rear foot motion capture data was collected in the 10 combinations and the results were analysed using elementary statistical analysis to observe trends.


f. Results: When the FootTrak output data was analysed to compare rearfoot kinematic characteristics of the 5 shoes, tested with and without the BAREFOOTSCIENCE™ insoles, it was found that the average maximum pronation of the shoes in the original insole condition was 16.5o compared to 9.1o for the BAREFOOTSCIENCE™ condition, a reduction in maximum pronation of 7.4 o or 44.85%.


The average total pronation of the shoes in the original insole condition was 11.7o compared to 5.9o for the BAREFOOTSCIENCE™ condition, a reduction in maximum pronation of 5.8 o or 49.57%. In the original insole condition the subject remained in pronation during propulsion displaying 8.3o of pronation while in the Barefoot Science condition the subject assumed a supinated take off position with 3.4o of supinatio.


g. Conclusions: The findings conclusively indicate that for the subject there was a definite reduction in the magnitude of pronation occurring during the stance phase when the BAREFOOTSCIENCE™ insole was introduced into the subject’s shoe replacing the originally equipped insole. In addition the use of the BAREFOOTSCIENCE™ insole promoted a more efficient foot position for takeoff and propulsion.


h. Discussion: As pronation, and in particular excess pronation, is often cited as a factor contributing to gait related pathologies and as such reductions in this pronation have been presented by others as potentially reducing gait related injuries and pathology, the BAREFOOTSCIENCE™ insole demonstrates remarkable abilities in immediately reducing the potentially harmful pronation and also enhancing a less injurious and more efficient foot position for takeoff.


*The Dynapro Insole was manufactured to the specification outlined in US Patent 5,404,659.



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