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The influence of body position on autonomic nervous system function
The Pavlovian Journal of Biological Science
|January 1, 1978
Summary
Body position significantly impacts physiological measurements like heart rate and blood pressure. Vertical positions increase sympathetic arousal compared to horizontal, influencing research on psychiatric populations.
Area of Science:
- Physiological psychology
- Psychophysiology
- Human physiology
Background:
- Understanding physiological differences in psychiatric populations is crucial.
- Basal physiological levels and pretest activity can influence study outcomes.
- Body position is a potential confounding variable in physiological research.
Purpose of the Study:
- To investigate the influence of body position on physiological measurements.
- To examine the effect of testing sequence on physiological responses.
- To identify key variables for accurate physiological assessments in psychiatric research.
Main Methods:
- Twenty male participants were monitored for five physiological measurements.
- Participants were tested in both horizontal and vertical body positions.
- The order of body position testing was counterbalanced across participants.
Main Results:
- Body position significantly altered basal levels of heart rate (HR), finger volume (FV), skin resistance (SR), and blood pressure (BP).
- Sympathetic arousal was significantly higher in the vertical position compared to the horizontal position.
- The sequence of testing influenced physiological activity, indicating order effects.
Conclusions:
- Both resting physiological levels and pretest activity are critical factors in psychophysiological research.
- Body position is a significant variable that must be controlled or accounted for in studies, especially those involving psychiatric populations.
- Future research should consider these factors to ensure accurate and reliable findings on physiological differences.