The generalizability of cardiovascular responses across settings

Area of Science:

• Psychophysiology
• Cardiovascular Research
• Behavioral Medicine

Background:

• The generalizability of cardiovascular reactivity (CVR) change scores is limited.
• Previous studies showed poor correlations between laboratory and field CVR measurements due to multiple differing factors.
• Interpreting these discrepancies is challenging when numerous variables are confounded.

Purpose of the Study:

• To isolate the effect of setting on the generalizability of CVR.
• To compare CVR measurements obtained in a laboratory versus non-laboratory settings.
• To assess the test-retest reliability of CVR within a laboratory setting.

Main Methods:

• Twenty-four female participants underwent four sessions: two in the lab, one in a classroom, and one at home.
• Procedures, including a math task and physiological monitoring (blood pressure, heart rate), were identical across all settings.
• Systolic blood pressure (SBP) and diastolic blood pressure (DBP) changes were analyzed for reliability and correlations.

Main Results:

• High test-retest reliability for blood pressure changes was observed between two laboratory sessions (rs = 0.68 for SBP, 0.62 for DBP).
• Lower correlations were found between laboratory and non-laboratory settings (rs = 0.47 for SBP, 0.38 for DBP).
• A change in setting alone, a minor procedural variation, demonstrably reduced the generalizability of CVR measurements.

Conclusions:

• Setting is a critical factor influencing the generalizability of cardiovascular reactivity.
• Even subtle changes in experimental environment can significantly impact lab-to-field correlations.
• Findings suggest that other, more substantial lab-field differences likely have an even greater negative impact on generalizability.