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Objective vs. Subjective Evaluation of Cognitive Performance During 0.4-MPa Dives Breathing Air or Nitrox.

Abstract Divers try to limit risks associated with their sport, for instance by breathing enriched air nitrox (EANx) instead of air. This double blinded, randomized trial was designed to see if the use of EANx could effectively improve cognitive performance while diving.
PMID
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Authors

Mayor MeshTerms

Air

Cognition

Diving

Keywords
Journal Title aerospace medicine and human performance
Publication Year Start




PMID- 28417835
OWN - NLM
STAT- MEDLINE
DA  - 20170418
DCOM- 20170615
LR  - 20170615
IS  - 2375-6314 (Print)
IS  - 2375-6314 (Linking)
VI  - 88
IP  - 5
DP  - 2017 May 01
TI  - Objective vs. Subjective Evaluation of Cognitive Performance During 0.4-MPa Dives
      Breathing Air or Nitrox.
PG  - 469-475
LID - 10.3357/AMHP.4608.2017 [doi]
AB  - BACKGROUND: Divers try to limit risks associated with their sport, for instance
      by breathing enriched air nitrox (EANx) instead of air. This double blinded,
      randomized trial was designed to see if the use of EANx could effectively improve
      cognitive performance while diving. METHODS: Eight volunteers performed two
      no-decompression dry dives breathing air or EANx for 20 min at 0.4 MPa. Cognitive
      functions were assessed with a computerized test battery, including MathProc and 
      Ptrail. Measurements were taken before the dive, upon arrival and after 15 min at
      depth, upon surfacing, and at 30 min postdive. After each dive subjects were
      asked to identify the gas they had just breathed. RESULTS: Identification of the 
      breathing gas was not possible on subjective assessment alone, while cognitive
      assessments showed significantly better performance while breathing EANx. Before 
      the dives, breathing air, mean time to complete the task was 1795 ms for MathProc
      and 1905 ms for Ptrail. When arriving at depth MathProc took 1616 ms on air and
      1523 ms on EANx, and Ptrail took 1318 ms on air and and 1356 ms on EANx, followed
      15 min later by significant performance inhibition while breathing air during the
      ascent and the postdive phase, supporting the concept of late dive/postdive
      impairment. DISCUSSION: The results suggest that EANx could protect against
      decreased neuro-cognitive performance induced by inert gas narcosis. It was not
      possible for blinded divers to identify which gas they were breathing and
      differences in postdive fatigue between air and EANx diving deserve further
      investigation.Germonpre P, Balestra C, Hemelryck W, Buzzacott P, Lafere P.
      Objective vs. subjective evaluation of cognitive performance during 0.4-MPa dives
      breathing air or nitrox. Aerosp Med Hum Perform. 2017; 88(5):469-475.
FAU - Germonpre, Peter
AU  - Germonpre P
FAU - Balestra, Costantino
AU  - Balestra C
FAU - Hemelryck, Walter
AU  - Hemelryck W
FAU - Buzzacott, Peter
AU  - Buzzacott P
FAU - Lafere, Pierre
AU  - Lafere P
LA  - eng
PT  - Comparative Study
PT  - Journal Article
PT  - Randomized Controlled Trial
PL  - United States
TA  - Aerosp Med Hum Perform
JT  - Aerospace medicine and human performance
JID - 101654770
RN  - 37291-87-5 (nitrox)
RN  - N762921K75 (Nitrogen)
RN  - S88TT14065 (Oxygen)
SB  - IM
SB  - S
MH  - Adult
MH  - *Air
MH  - *Cognition
MH  - *Diving
MH  - Double-Blind Method
MH  - Humans
MH  - Inert Gas Narcosis/*prevention & control/psychology
MH  - Nitrogen/*therapeutic use
MH  - Oxygen/*therapeutic use
MH  - Respiration
MH  - Task Performance and Analysis
EDAT- 2017/04/19 06:00
MHDA- 2017/06/16 06:00
CRDT- 2017/04/19 06:00
AID - 10.3357/AMHP.4608.2017 [doi]
PST - ppublish
SO  - Aerosp Med Hum Perform. 2017 May 1;88(5):469-475. doi: 10.3357/AMHP.4608.2017.