Acute hypoxia and related symptoms on mild exertion at simulated altitudes below 3048 m.
Aviat Space Environ Med
; 78(10): 979-84, 2007 Oct.
Article
en En
| MEDLINE
| ID: mdl-17955948
ABSTRACT
INTRODUCTION:
Helicopter aircrew have reported features of hypoxia below 3048 m (10,000 ft). The aim of this study was to examine the effect of physical activity below 3048 m on the development of hypoxia.METHODS:
Six subjects exercised at 30 W and 60 W for 4 min at sea level, 610 m, 2134 m, and 2743 m (2000 ft, 7000 ft, and 9000 ft).RESULTS:
There was an abrupt decrease in Spo2 once physical activity was commenced. This was small at sea level (1%) and 610 m (2.2%), however, the Spo2 fell by 4.3% at 2134 m and 5.5% at 2743 m (to Spo2 88.1% and 85.7%, respectively). Spo2 returned to near-resting values within 3 min of stopping exercise. Symptoms of hypoxia were reported significantly more frequently during activity than rest at each of the altitudes.DISCUSSION:
Helicopter aircrew should be aware that physical activity as low as 2134 m can produce hypoxemia and symptoms of hypoxia similar to that which would normally be expected in a person resting at approximately 3658-4572 m (12,000-15,000 ft).
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Aeronaves
/
Medicina Aeroespacial
/
Altitud
/
Hipoxia
/
Personal Militar
Tipo de estudio:
Clinical_trials
/
Diagnostic_studies
Límite:
Adult
/
Humans
/
Male
/
Middle aged
País/Región como asunto:
Oceania
Idioma:
En
Revista:
Aviat Space Environ Med
Año:
2007
Tipo del documento:
Article
País de afiliación:
Arabia Saudita