PH changes during muscle twitch and tetanus.

Abstract

DUBUISSON1–3 has shown that pH variations during muscle activity can be recorded at the muscle surface with a glass electrode, using an electrometer and a sensitive galvanometer. Displaying the d.c. amplified electromotive force changes of the glass electrode, on the screen of a cathode-ray tube, reduces the recording delay to a few msec., and makes it possible4 to estimate the time constant of the glass electrode (McInnes type), transmitting a pH step, to be about 30 msec.