About Tibial Shock (Peak Positive Acceleration of the Tibia)

Peak Tibial Shock, also known as Peak Positive Acceleration (PPA) of the tibia, has been found to be strongly correlated with vertical force loading rate or impact loading(4).


A higher risk of overuse injuries such as stress fractures has been linked to high Peak Tibial Shock and high loading rate during initial foot contact(8).

A stress fracture is a serious injury, and usually athletes must refrain from running during recovery.

The TgForce impact sensor is a tool for monitoring tibial shock when running. Athletes and runners should consult a sports health professional for prevention and treatment of running injuries.



Studies and articles about Peak Tibial Shock (Peak Positive Acceleration PPA, Peak Tibial Acceleration), gait retraining, transition to minimalist and implications:

Gradual Transition to Minimalist

 1. More Support for Slow Transition to Minimalism  http://www.runnersworld.com/minimalist-shoes/more-support-for-slow-transition-to-minimalism

  Gait retraining using tibial acceleration sensor

2 Clansey AC,Hanlon M, Wallace ES, Nevill A, Lake MJ, 2014. Influence of tibial shock feedback training on impact loading and running economy. Med Sci Sports Exerc; 2014;46(5):973-81. http://www.ncbi.nlm.nih.gov/pubmed/24121245?report=abstract

3.Crowell,H.P.,Davis,I.S.,2011.Gait retraining to reduce lower extremity loading in runners. Clin.Biomech.26,7883. http://www.clinbiomech.com/article/S0268-0033(10)00251-2/fulltext

4.Crowell,H.P.,Milner,C.E.,Hamill,J.,Davis,I.S.,2010.Reducing impact loading during running with the use of real-time visual feedback.J.Orthop.SportsPhys. Ther.40,206–213. http://www.jospt.org/doi/pdf/10.2519/jospt.2010.3166


Tibial Stress & Injury

5.Milner CE1, Ferber R, Pollard CD, Hamill J, Davis IS., 2006, Biomechanical factors associated with tibial stress fracture in female runners. Med Sci Sports Exerc. 2006 Feb;38(2):323-8. http://www.runsnrc.org/RUNSNRC/Clinic_-_Supporting_Research_files/Milner_MSSE06.pdf

6.Lieberman DE, Venkadesan M, Werbel WA, Daoud AI, D’Andrea S, Davis IS, Mang’eni RO, Pitsiladis Y.,  2010, Foot strike patterns and collision forces in habitually barefoot versus shod runners. Nature. 2010 Jan 28;463(7280):531-5. doi: 10.1038/nature08723. Article review on runbare.com Related site on Harvard University website – Running Barefoot

7.Olin ED, Gutierrez GM., 2013, EMG and tibial shock upon the first attempt at barefoot running., Hum Mov Sci. 2013 Apr;32(2):343-52. doi: 10.1016/j.humov.2012.11.005. Epub 2013 May 3. Abstract

8.Davis, I., Milner, C.,Hamil, J.,2004 Does increased loading during running lead to tibial stress fracture? A prospective study. Medicine and Science in Sports and Exercise 35,S58 Supplement.