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Old 08-19-2015, 11:26 PM
Lara Lara is offline
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Join Date: Sep 2006
Posts: 10,984
15 yr Member
Lara Lara is offline
Legendary
 
Join Date: Sep 2006
Posts: 10,984
15 yr Member
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The only HRV that I imagine it could be is
heart rate variability.

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4131496/
Heart rate variability interventions for concussion and rehabilitation
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"Thanks for this!" says:
MicroMan (08-20-2015)