Stroop vs. Rest

Blood Goal: Assess blood pressure differences between rest and the Stroop task and whether this difference is different in OSA than healthy controls (HCs).

The Stroop task is a color-word naming task consists of 3 separate parts:

Naming colors of non-word stimuli (rectangles)
Reading color words (congruent)
Naming the color of a word that describes a color but is printed in a different color. This condition is an incongruent set of stimuli and requires inhibition of our automatic mental reading abilities. Therefore, it requires more time (i.e. response time) to name the colors.

Each block had a maximum duration of 270 seconds or 4.5 minutes.

A Stroop effect or score can be computed from the accuracy (number of mistakes) and time to read through the list. Thereby, timing and accuracy of all 3 conditions are considered.

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Does blood pressure differ between rest, congruent and incongruent conditions of the Stroop task?
Do OSA patients respond differently to the Stroop than healthy controls?
Can the differences be explained by the breathing/speaking rate of the Stroop task?

Analyses

Repeated measures ANOVA:

Within-subject factor: condition
1. Word reading
2. Color naming
3. Incongruent
4. Rest period
Between-subject factor:
1. OSA vs. healthy control (HC)
Dependent variables:
1. Breathing rates
2. Inspiratory duty cycle (inhale/(inhale+exhale))
3. Systolic blood pressure
4. Diastolic blood pressure
5. Mean blood pressure

Correlations:

Breathing rate per condition X blood pressure per condition
Breathing rate difference (congruent - incongruent) X blood pressure (congruent - incongruent)
Are the differences in correlations between OSA and healthy controls significant?