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Cardiovascular responses to behavioral stressors: laboratory-field generalization and inter-task consistency
J R Turner1, S S Girdler, A Sherwood
1Department of Psychiatry, University of North Carolina, Chapel Hill 27599.
Journal of Psychosomatic Research
|January 1, 1990
Summary
Laboratory stress tests show that while absolute heart rate and blood pressure readings generalize to real-world scenarios, stress reactivity scores do not. Adjusting for standing posture improved reactivity correlations for blood pressure but not heart rate.
Area of Science:
- Physiology
- Psychophysiology
- Occupational Health
Background:
- Physiological responses to stress, including blood pressure and heart rate, are often studied in laboratory settings.
- Generalizability of laboratory findings to real-world stressors is crucial for accurate stress assessment and management.
Purpose of the Study:
- To investigate the laboratory-field generalization of cardiovascular and heart rate responses to stress.
- To compare absolute physiological levels and stress reactivity scores between laboratory tasks and a real-world research presentation.
Main Methods:
- Thirty medical, dental, and graduate students underwent four laboratory tasks while their blood pressure and heart rate were monitored.
- On a separate day, participants wore an ambulatory blood pressure monitor during a real-world research presentation.
- Reactivity scores were calculated as the difference between task-level and pre-task baseline measurements.
Main Results:
- Significant correlations were found between laboratory tasks for both absolute heart rate/blood pressure levels and reactivity scores.
- Absolute heart rate and blood pressure levels during laboratory tasks correlated significantly with those during the real-world stressor.
- Reactivity scores showed non-significant correlations between laboratory tasks and the real-world stressor.
- Recalculating real-world reactivity using standing baselines improved correlations for systolic and diastolic pressure, but not heart rate.
Conclusions:
- Cardiovascular responses in laboratory settings generalize to real-world stressors in terms of absolute levels, but not reactivity.
- The seated posture in laboratory tasks may confound the assessment of stress reactivity compared to standing real-world situations.
- Adjusting for posture offers potential for improved laboratory-to-field generalization of stress reactivity measures, particularly for blood pressure.