sounds exactly like spasticity/clonus, esp related to the application of pressure on the ball of the foot. that's just how my physio used to test my spasticity back in the day - press on the balls of my feet and count the 'beats'.
odd sx? no dx? check w/ dietitian
DRI=MINIMUM eg bit.ly/1vgQclQ
99% don't meet these. meds/lifestyle can affect levels
status can be low in ms & other cond'ns
'but my results are normal'. typical panels don't test all
deficits occur in 'normal' range