You could try to link with them through here, LinkedIn, academia.edu, etc. A previous colleague of mine who is a biomechanist is Dr Dave Cook, coach of the Norwegian Taekwondo team, and another colleague is Dr Xavier Sanchez who worked as a sport psychologist with a Taekwondo team. Hope this helps.
I'll try social network. Here and LinkedIn are kind of active all ready - maybe not the most effective way. I'll check academia.edu. Thanks for your advice.
I am involved in martial arts / combat sports research myself, feel free to follow me and look at my publications. I am also on linkedin. I have a similar problem as yourself, I think it may be because we are few and far between!
I am involved in dance training and dance medicine and science research, but would love to connect about martial arts movement research. My son is involved in Tae Kwon Do and I travel with their touring team. You can also find me on LinkedIn.
We included martial arts techniques in our falls prevention program (Nijmegen Falls Prevention Program) and did several studies related to these martial arts fall techniques.
(for more information: see publications B.E. Groen, V. Weerdesteyn and myself).
This is a longstanding journal on asian martial arts, - more articles and research than you could likely assimilate. Again, don't know how active any of these would remain.
Might be something already done on falling in there, - these previously were on file at the Mpls Mn. public library.
I have a huge (paper) archive of martial arts / combat research papers from all kinds of authors. Can you narrow your interests at all? I'll see what I can get you as a literature review.
(Or are you looking for a community of people, rather than research papers?)
My experience has been simply to be active in many different places, both online and offline. Through this I have a massed a few key researchers and many mediocre participants. My main tip would be to search and interact on Facebook pages and groups, as well as academia.edu and LinkedIn. No shortcuts here it seems.
Perhaps collaborate with our i-dojo: International Judo Research Unit at the University of Hertfordshire. https://www.herts.ac.uk/research/centres/psychology/sports-health-and-exercise/international-judo-research-unit-i-dojo