Population
8 short-term and 11 long-term heart transplant recipients, and 17 healthy humans
Comparison
Graded head-up tilt (15 to 75° in 15° steps) vs Rest
Design
Cross-sectional, random order of tilt steps
Authors
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Tilt angle must be standardized in baroreflex assessments; leaves open applicability to patients with cardiovascular disease.
The study demonstrates that graded head-up tilt shifts the dominant causal direction between heart period and systolic arterial pressure, highlighting the importance of tilt inclination in assessing spontaneous baroreflex sensitivity.
Porta et al. (2010) studied this question.
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