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Cognitive performance during a simulated climb of Mount Everest: implications for brain function and central adaptive processes under chronic hypoxic stress

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Pflügers Archiv : Volume 436, Issue 3, June 1998

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Pflügers Archiv : Volume 436, Issue 1, April 1998

Pflügers Archiv : Volume 435

Pflügers Archiv : Volume 434

Pflügers Archiv : Volume 433

Cognitive performance during a simulated climb of Mount Everest: implications for brain function and central adaptive processes under chronic hypoxic stress

Content Provider	Springer Nature Link
Author	Abraini, J. H. Bouquet, C. Joulia, F. Nicolas, M. Kriem, B.
Copyright Year	1998
Abstract	High altitude is characterized by hypoxic environmental conditions and is well known to induce both physiological and psychological disturbances. In the present study, called ”Everest-Comex 97”, the authors investigated the effects of high altitude on the psychosensorimotor and reasoning processes of eight climbers participating in a simulated climb from sea level to 8,848 m over a 31-day period of confinement in a decompression chamber. Tests of visual reaction time, psychomotor ability, and number ordination were used. The climbers’ data were compared with data from a similar laboratory study at sea level in control subjects. Continued testing of the control subjects at sea level clearly led to learning effects and improvement of performance in psychomotor ability and number ordination. In the climbers, similar learning effects occurred up to an altitude of 5,500–6,500 m. With further increases in altitude, the climbers’ psychomotor performance and mental efficiency deteriorated progressively, leading to significant differences in psychomotor ability and mental efficiency between control subjects and climbers (9 and 13% respectively at 8,000 m and 17.5 and 16.5% respectively at 8,848 m). Three days (72 h) after the climbers had returned to sea level, their mental and psychomotor performances were still significantly lower than those of control subjects (by approximately 10%). In contrast, visual reaction time showed no significant changes in either climbers or control subjects. It is suggested that chronic hypoxic stress could alter selectively mental learning processes, i.e. explicit, rather than implicit (stimulus-response learning processes) memory and cortico-limbic rather than basal ganglia-sensorimotor system function.
Starting Page	553
Ending Page	559
Page Count	7
File Format	PDF
ISSN	00316768
Journal	Pflügers Archiv
Volume Number	436
Issue Number	4
e-ISSN	14322013
Language	English
Publisher	Springer-Verlag
Publisher Date	1998-07-27
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Clinical Biochemistry

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