Key result
Elite breath-hold diving was not associated with increased resting sympathetic activity (31 vs 33 bursts/min) or arterial hypertension compared to controls.
Why the study?
Do elite breath-hold divers have increased resting sympathetic activity and blood pressure compared to healthy controls?
Population
20 subjects. Divers participated in 7.3 +/- 1.2 diving competitions and 76.4 +/- 14.6 apnea training…
Comparison
Hypercapnic challenge vs Healthy control subjects
Design
Cross-sectional
Authors
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No association in elite divers; leaves open whether repeated hypoxemia drives sympathetic overactivity in comorbid populations.
Cross-Sectional (n=20)
Do elite breath-hold divers have increased resting sympathetic activity and blood pressure compared to healthy controls?
Absolute Event Rate: 31% vs 33%
Repeated bouts of hypoxemia in elite breath-holding divers do not lead to sustained sympathetic activation or arterial hypertension, suggesting hypoxemia alone without comorbidities may not drive resting sympathetic overactivity.
Dujić et al. (2007) conducted a cross-sectional in Healthy (n=20). Elite breath-hold diving vs. Control subjects was evaluated on Baseline muscle sympathetic nerve activity (MSNA) frequency (bursts/min). Elite breath-hold diving was not associated with increased resting sympathetic activity (31 vs 33 bursts/min) or arterial hypertension compared to controls.
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