For certain types of shocks, acute reductions in finger blood flow can be predicted from the rms acceleration.

This study investigated how reductions in finger blood flow depend on shock repetition rate and the peak and rms magnitude of acceleration. Different repetition rates (1.3-83.3 s(-1)) and different peak magnitudes (10-88 ms(-2) peak) but the same rms acceleration (10 ms(-2) rms) caused similar decreases in blood flow in fingers on exposed and unexposed hands. Shocks with a 83.3 s(-1) repetition rate, peak magnitude of 10 ms(-2) and rms acceleration of 10 ms(-2) provoked greater reduction in finger blood flow than shocks with the same peak magnitude but lower repetition rate (21 or 5.3 s(-1)) and lower rms acceleration (5 or 2.5 ms(-2)).

Source: Acute effects of mechanical shocks on finger blood flow: influence of shock repetition rate and shock magnitude. Ye Y, Mauro M, Bovenzi M, Griffin MJ. Int Arch Occup Environ Health. 2011 Oct 2.

http://www.ncbi.nlm.nih.gov/pubmed/21964880