Table 2.

Mean (±SD) subjective ratings across conditioned respiratory tasks.

	Unloaded cue	Breathlessness cue
Study 1
Difficulty rating	2.8 (3.5)	46.5 (16.0)*
Anxiety rating	2.5 (3.9)	34.0 (18.8)*
Study 2: Saline
Intensity rating	12 (16)	71 (20)*
Unpleasantness rating	10 (18)	61 (32)*
Study 2: Remifentanil
Intensity rating	11 (14)	68 (20)*
Unpleasantness rating	7 (11)	49 (26)*,†

^*Significantly (P < 0.05) different from corresponding unloaded breathing condition.

^†Significantly different from corresponding saline condition (applies to remifentanil conditions alone). Data reproduced from previous publications.^27,35