There is a book linking the feet to emotions called Language of the Feet by Chris Stormer – Fryer SRN. SCM, HV, Dip R published by Hodder and Stoughton, London, UK. Some of our South African Reflexologists have studied this and use it in their practices. Chris may be contacted at firstname.lastname@example.org
But what I think you are looking for could be called Applied kinesiology (muscle testing), which links to the entire body.
I hope I have been of some assistance.
Editor The SA Reflexology Society Journal
TSARS Ntnl EXCO
TSARS Gauteng Chairlady
Vice Chair IARMT