Global REACH 2018: The Effect of an Expiratory Resistance Mask with Dead Space on Sleep and Acute Mountain Sickness During Acute Exposure to Hypobaric Hypoxia

2020 ◽  
Vol 21 (3) ◽  
pp. 297-302 ◽  
Author(s):  
Jay Carr ◽  
Rachel Stone ◽  
Courtney Tymko ◽  
Kaitlyn Tymko ◽  
Geoff B. Coombs ◽  
...  
Keyword(s):  
Dead Space ◽  
Hypobaric Hypoxia ◽  
Acute Mountain Sickness ◽  
Acute Exposure ◽  
Expiratory Resistance ◽  
Mountain Sickness ◽  
Global Reach

The Effect of an Expiratory Resistance Mask with Dead Space on Sleep, Acute Mountain Sickness, Cognition, and Ventilatory Acclimatization in Normobaric Hypoxia

2019 ◽  
Vol 20 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Alexander Patrician ◽  
Michael M. Tymko ◽  
Hannah G. Caldwell ◽  
Connor A. Howe ◽  
Geoff B. Coombs ◽  
...  
Keyword(s):  
Dead Space ◽  
Acute Mountain Sickness ◽  
Normobaric Hypoxia ◽  
Expiratory Resistance ◽  
Mountain Sickness

Elevated plasma S100B levels in high altitude hypobaric hypoxia do not correlate with acute mountain sickness

2014 ◽  
Vol 36 (9) ◽  
pp. 779-785 ◽  
Author(s):  
Craig D. Winter ◽  
Timothy R. Whyte ◽  
John Cardinal ◽  
Stephen E. Rose ◽  
Peter K. O’Rourke ◽  
...  
Keyword(s):  
High Altitude ◽  
Hypobaric Hypoxia ◽  
Acute Mountain Sickness ◽  
Elevated Plasma ◽  
Mountain Sickness

Effect of repeated normobaric hypoxia exposures during sleep on acute mountain sickness, exercise performance, and sleep during exposure to terrestrial altitude

2011 ◽  
Vol 300 (2) ◽  
pp. R428-R436 ◽  
Author(s):  
Charles S. Fulco ◽  
Stephen R. Muza ◽  
Beth A. Beidleman ◽  
Robby Demes ◽  
Janet E. Staab ◽  
...  
Keyword(s):  
Heart Rate ◽  
Exercise Performance ◽  
Hypobaric Hypoxia ◽  
Sham Group ◽  
Acute Mountain Sickness ◽  
Time Trial ◽  
Normobaric Hypoxia ◽  
Performance Decrement ◽  
Mountain Sickness ◽  
End Tidal

There is an expectation that repeated daily exposures to normobaric hypoxia (NH) will induce ventilatory acclimatization and lessen acute mountain sickness (AMS) and the exercise performance decrement during subsequent hypobaric hypoxia (HH) exposure. However, this notion has not been tested objectively. Healthy, unacclimatized sea-level (SL) residents slept for 7.5 h each night for 7 consecutive nights in hypoxia rooms under NH [ n = 14, 24 ± 5 (SD) yr] or “sham” ( n = 9, 25 ± 6 yr) conditions. The ambient percent O2 for the NH group was progressively reduced by 0.3% [150 m equivalent (equiv)] each night from 16.2% (2,200 m equiv) on night 1 to 14.4% (3,100 m equiv) on night 7, while that for the ventilatory- and exercise-matched sham group remained at 20.9%. Beginning at 25 h after sham or NH treatment, all subjects ascended and lived for 5 days at HH (4,300 m). End-tidal Pco2, O2 saturation (SaO2), AMS, and heart rate were measured repeatedly during daytime rest, sleep, or exercise (11.3-km treadmill time trial). From pre- to posttreatment at SL, resting end-tidal Pco2 decreased ( P < 0.01) for the NH (from 39 ± 3 to 35 ± 3 mmHg), but not for the sham (from 39 ± 2 to 38 ± 3 mmHg), group. Throughout HH, only sleep SaO2 was higher (80 ± 1 vs. 76 ± 1%, P < 0.05) and only AMS upon awakening was lower (0.34 ± 0.12 vs. 0.83 ± 0.14, P < 0.02) in the NH than the sham group; no other between-group rest, sleep, or exercise differences were observed at HH. These results indicate that the ventilatory acclimatization induced by NH sleep was primarily expressed during HH sleep. Under HH conditions, the higher sleep SaO2 may have contributed to a lessening of AMS upon awakening but had no impact on AMS or exercise performance for the remainder of each day.

scholarly journals Principal Component Analysis and Risk Factors for Acute Mountain Sickness upon Acute Exposure at 3700 m

PLoS ONE ◽  
2015 ◽  
Vol 10 (11) ◽  
pp. e0142375 ◽  
Author(s):  
Shi-Zhu Bian ◽  
Jun Jin ◽  
Ji-Hang Zhang ◽  
Qian-Ning Li ◽  
Jie Yu ◽  
...  
Keyword(s):  
Risk Factors ◽  
Principal Component Analysis ◽  
Acute Mountain Sickness ◽  
Principal Component ◽  
Component Analysis ◽  
Acute Exposure ◽  
Mountain Sickness

Acute Mountain Sickness Symptomology in Normobaric vs Hypobaric Hypoxia

2015 ◽  
Vol 47 ◽  
pp. 604
Author(s):  
Dana M. DiPasquale ◽  
Gary E. Strangman ◽  
N. Stuart Harris ◽  
Stephen R. Muza
Keyword(s):  
Hypobaric Hypoxia ◽  
Acute Mountain Sickness ◽  
Mountain Sickness

scholarly journals Effect Of Heat Acclimation On Incidence Of Acute Mountain Sickness During Exposure To Hypobaric Hypoxia (3,500 M)

2020 ◽  
Vol 52 (7S) ◽  
pp. 192-192
Author(s):  
Roy M. Salgado ◽  
Adam L. Luippold ◽  
Kirsten E. Coffman ◽  
Karleigh E. Bradbury ◽  
Beau R. Yurkevicius ◽  
...  
Keyword(s):  
Hypobaric Hypoxia ◽  
Acute Mountain Sickness ◽  
Heat Acclimation ◽  
Mountain Sickness
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