Key result
Passive head-up tilt produced dose-dependent increases in sympathetic activation, with norepinephrine increasing by 102% and heart rate by 45% at a 70° tilt angle compared to resting controls.
Why the study?
Does passive head-up tilt at different angles alter endocrine, hemodynamic, and blood concentration parameters in men?
Population
Men undergoing passive head-up tilt testing
Comparison
Passive head-up tilt at 12, 30, 53, or 70… vs Resting controls
Design
Other
Follow-up
70 minutes
Authors
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May inform tilt-test protocols in research; leaves open clinical relevance in patients.
Does passive head-up tilt at different angles alter endocrine, hemodynamic, and blood concentration parameters in men?
Effect estimate: 102% increase
Absolute Event Rate: 421% vs 247%
p-value: p=<0.05
Passive orthostatic loading produces dose-dependent changes in endocrine, hemodynamic, and blood composition parameters, with post-orthostatic bradycardia occurring even after mild tilt.
László et al. (2001) studied Healthy (n=7). Passive head-up tilt vs. Supine resting control (0°) was evaluated on Norepinephrine concentration at 27 minutes of 70° head-up tilt (pg/ml) (102% increase, p=<0.05). Passive head-up tilt produced dose-dependent increases in sympathetic activation, with norepinephrine increasing by 102% and heart rate by 45% at a 70° tilt angle compared to resting controls.
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