Key result
Baroreflex-induced sympathetic activation via lower body negative pressure did not alter cerebrovascular CO2 response slopes during steady-state hypercapnia (3.14 vs. 2.96 cm/s/mmHg) or hypocapnia.
Why the study?
Does baroreflex-induced sympathetic activation alter cerebrovascular CO2 responsiveness in healthy humans?
Does baroreflex-induced sympathetic activation alter cerebrovascular CO2 responsiveness in healthy humans?
Absolute Event Rate: 3.14% vs 2.96%
Baroreflex-induced sympathetic activation does not alter cerebrovascular CO2 responsiveness, challenging the concept that sympathetic activation restrains cerebrovascular responses to CO2.
No takes yet. Share an insight, caveat, or question.
No immediate clinical implications for cerebrovascular reactivity assessment; challenges sympathetic restraint hypothesis but remains hypothesis-generating.
LeMarbre et al. (2003) studied Healthy. Lower body negative pressure (LBNP) vs. no-LBNP was evaluated on Cerebrovascular CO2 response slopes during steady-state hypercapnia. Baroreflex-induced sympathetic activation via lower body negative pressure did not alter cerebrovascular CO2 response slopes during steady-state hypercapnia (3.14 vs. 2.96 cm/s/mmHg) or hypocapnia.
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