Fig. 8.

Examples of isometric tension developed by an isolated medial rectus muscle responding to a 0.5-ms electrical pulse (twitch response) and a 300-ms-duration, 200-Hz pulse train (tetanus response). A: complete response. Tension calibrations are arbitrary, but twitch and tetanus responses share the same calibration. Vertical cursors indicate stimulus onset and the offset of the long stimulus. B: data are identical to A, but timescale is expanded and responses are normalized and time-shifted to facilitate comparison of the twitch and tetanus behaviors following stimulus offset.