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Effects of lung volume and involuntary breathing movements on the human diving response
Mittuniversitetet, Fakulteten för naturvetenskap, teknik och medier, Institutionen för naturvetenskap.
1997 (engelsk)Inngår i: European Journal of Applied Physiology, ISSN 1439-6319, Vol. 77, nr 1/2, s. 19-24Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

The effects of lung volume and involuntary breathing movements on the human diving response were studied in 17 breath-hold divers. Each subject performed maximal effort apnoeas and simulated dives by apnoea and cold water face immersion, at lung volumes of 60%, 85%, and 100% of prone vital capacity (VC). Time of apnoea, blood pressure, heart rate, skin capillary blood flow, and fractions of end-expiratory CO 2 and O 2 were measured. The length of the simulated dives was the shortest at 60% of VC, probably because at this level the build up of alveolar CO 2 was fastest. Apnoeas with face immersion at 100% of VC gave a marked drop in arterial pressure during the initial 20?s, probably due to high intrathoracic pressure mechanically reducing venous return. The diving response was most pronounced at 60% of VC. We concluded that at the two larger lung volumes both mechanical factors and input from pulmonary stretch receptors influenced the bradycardia and vasoconstriction, resulting in a non-linear relationship between the breath-hold lung volume and magnitude of the diving response in the near-VC range. Furthermore, the involuntary breathing movements that appeared during the struggle phase of the apnoeas were too small to affect the diving response

sted, utgiver, år, opplag, sider
1997. Vol. 77, nr 1/2, s. 19-24
Emneord [en]
involuntary breathing, diving response
HSV kategori
Identifikatorer
URN: urn:nbn:se:miun:diva-2055DOI: 10.1007/s004210050294Lokal ID: 1607OAI: oai:DiVA.org:miun-2055DiVA, id: diva2:27087
Tilgjengelig fra: 2008-09-30 Laget: 2008-09-30 Sist oppdatert: 2018-01-12bibliografisk kontrollert

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