Simultaneous long-term recording of the mechanical and intracellular electrical activity of smooth muscles.

The construction and use of tissue holders that allow simultaneous long-term recordings of mechanical and intracellular electrical activity from a variety of smooth-muscle preparations is described. The tissue holders permit adjustment of tissue stretch following its fixation for recording purposes. By this means intracellular microelectrodes can be kept in position despite marked changes in the mechanical activity of the tissue. Since simultaneous recordings of electrical and mechanical activity of up to 2 hrs duration can be made, studies of the relationships between the membrane potential changes and mechanical changes evoked by drugs and neurotransmitters are greatly facilitated.