Abstract：
:If, as postulated, the end of the steady state phase (φ2) of cardiovascular responses to apnoea corresponds to the physiological breaking point, then we may hypothesize that φ2 should become visible if exercise apnoeas are performed in pure oxygen. We tested this hypothesis on 9 professional divers by means of continuous recording of blood pressure (BP), heart rate (fH), stroke volume (QS), and arterial oxygen saturation (SpO2) during dry maximal exercising apnoeas in ambient air and in oxygen. Apnoeas lasted 45.0 ± 16.9 s in air and 77.0 ± 28.9 s in oxygen (p < 0.05). In air, no φ2 was observed. Conversely, in oxygen, a φ2 of 28 ± 5 s duration appeared, during which systolic BP (185 ± 29 mmHg), fH (93 ± 16 bpm) and QS (91 ± 16 ml) remained stable. End-apnoea SpO2 was 95.5 ± 1.9% in air and 100% in oxygen. The results support the tested hypothesis.
journal_name
Respir Physiol Neurobioljournal_title
Respiratory physiology & neurobiologyauthors
Taboni A,Vinetti G,Bruseghini P,Camelio S,D'Elia M,Moia C,Ferretti G,Fagoni Ndoi
10.1016/j.resp.2018.05.003subject
Has Abstractpub_date
2018-09-01 00:00:00pages
17-21eissn
1569-9048issn
1878-1519pii
S1569-9048(18)30073-9journal_volume
255pub_type
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