The Relationship Between Landing Sound, Vertical Ground Reaction Force and Kinematics of the Lower Limb During Drop Landings in Healthy Males
Kevin Wernli et al

Journal of Orthopaedic & Sports Physical Therapy, 2016 Volume:0 Issue:0 Pages:1?22 DOI: 10.2519/jospt.2016.6041

Running quietly reduces ground reaction force and vertical loading rate and alters foot strike technique
Xuan Phan, Tiffany L. Grisbrook, Kevin Wernli, Sarah M. Stearne, Paul Davey & Leo Ng
Sports Science 03 Sep 2016

After reading material from the papers referenced above I wondered what would happen if you rigged a solid state accelerometer to a sound producing source and set the system to emit sound when impact transients are created during heel strike .

The accelerometer could be taped to the lower back area over the spine and the sound source could be a mobile phone located on the upper arm (I have seen people running with phones secured in this area so a suitable product probably exists ) .

The phone could be set to emit any number of noises and the effects studied .

Given the abstracts above I am fairly confident that if the phone was set to emit an embarrassing noise every time an impact transient was detected then the study subjects would quickly learn to run without such transients whether shod or unshod . This would be especially true if the subjects trained over time in a busy public area .

Would the gait changes induced be a good thing ? No idea .

However,I feel that the issues around ground reaction forces and injury are clouded by the shod/ unshod debate .
If the system I have outlined above could be made to work then the relationship between gait ,ground reaction forces ,and injury rates could be studied away from the barefoot debate and focus on gait changes among groups of shod individuals with the apparently powerful stimulus of sound being used as the gait changing tool .

Any thoughts ?