Terakawa S
Biochem Biophys Res Commun. 1983 Aug 12;114(3):1006-10. doi: 10.1016/0006-291x(83)90661-7.
In squid giant axons, a brief rise and fall in intracellular pressure that was concomitant with the action potential was detected by using a glass-fiber device. The amplitude of the pressure change was about 1 mPa.