Fig. 4. Pharyngeal constrictor muscle function during partial paralysis. Contraction peak amplitude (mmHg), slope of contraction curve (mmHg/s) and duration of contraction (ms). All variables versus train-of-four (TOF) ratio. Mean ± 1 SD. *P < 0.01. (Regression for each individual followed by t test for the mean regression coefficient of the group. The Wilcoxon signed rank test was used to detect differences between a TOF ratio > 0.90 and control.)