Key result
During orthostatic and mental challenges, the baroreflex-based peripheral mechanism becomes significantly more important in generating respiratory sinus arrhythmia compared to supine rest.
Why the study?
The major aim was to compare the relative importance of central and peripheral mechanisms in generating respiratory sinus arrhythmia non-invasively across different physiological states.
Does orthostatic or cognitive challenge alter the mechanisms of respiratory sinus arrhythmia generation in healthy volunteers?
Comparison
Supine rest vs orthostatic challenge vs cognitive load
Authors
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Baroreflex contribution to RSA rises with orthostatic and cognitive challenge; extends central-peripheral model but leaves open applicability beyond healthy volunteers.
Cross-Sectional (n=78)
No
Does orthostatic or cognitive challenge alter the mechanisms of respiratory sinus arrhythmia generation in healthy volunteers?
p-value: p=<0.0001
This study demonstrates that while both central and peripheral mechanisms generate respiratory sinus arrhythmia, the baroreflex-mediated peripheral mechanism dominates during orthostatic and cognitive stress.
Krohová et al. (2018) conducted a cross-sectional in Healthy volunteers (n=78). Orthostatic challenge (head-up tilt) and cognitive load (mental arithmetics) vs. Supine rest was evaluated on Difference between bivariate and trivariate causal coupling indexes (degree of indirectionality) from respiration to RR interval (p=<0.0001). During orthostatic and mental challenges, the baroreflex-based peripheral mechanism becomes significantly more important in generating respiratory sinus arrhythmia compared to supine rest.
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