Figure 3.

(A) A sample subject undergoing through the Endoflip stepped volume distension protocol. The subject was asked to perform a voluntary contraction following a 30-s rest period. The pressure change for this recording is shown as the red waveform, and the surface topograph represents the change in the balloon diameter. The changing colors from dark blue to yellow illustrate increasing diameter. The subject squeeze can be identified from the peaks of the red line, and the corresponding reduction in diameter of the anal canal and color change toward dark blue on the diameter topograph. (B) Boxplots showing the distribution of diameter values at 40ml and 50ml across the two groups, (C) Boxplots showing the distribution of balloon pressure values at 40ml and 50ml across the two groups.