| Effect of Repeated Normobaric Hypoxia Exposures during Sleep on Acute Mountain Sickness, Exercise Performance, and Sleep during Exposure to Terrestrial Altitude |
2011 |
10 pages |
| Authors:
Charles S. Fulco; Stephen R. Muza; Beth A. Beidleman; Robby Demes; Janet E. Staab; Juli E. Jones; Allen Cymerman; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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 | There is an expectation that repeated daily exposures to normobaric hypoxia (NH) will induce ventilatory acclimatization (VEacc) and be effective for lessening 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 hrs each night for 7 consecutive nights in hypoxia rooms under either NH (n=14, 24+/-5 yr; ... |
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| A Fuzzy Logic Algorithm to Assign Confidence Levels to Heart and Respiratory Rate Time Series |
03 JAN 2008 |
15 pages |
| Authors:
Jean Liu; Thomas M. McKenna; A. Gribok; Beth A. Beidleman; William J. Tharion; Jaques Reifman; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA BIOPHYSICS AND BIOMEDICAL MODELING DIV
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| We have developed a fuzzy logic-based algorithm to qualify the reliability of heart rate (HR) and respiratory rate (RR) vital-sign time-series data by assigning a confidence level to the data points while they are measured as a continuous data stream. The algorithm s membership functions are derived from physiology-based performance limits and mass-assignment-based datadriven characteristics of the signals. The assigned confidence levels are based on the reliability of each HR ... |
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| Validation of a Shortened Electronic Version of the Environmental Symptoms Questionnaire |
NOV 2006 |
18 pages |
| Authors:
Beth A. Beidleman; Stephen R. Muza; Charles S. Fulco; Paul B. Rock; Allen Cymerman; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| Acute Mountain Sickness (AMS) is a syndrome that is characterized by headache, insomnia, anorexia, nausea, dizziness, and fatigue, but without abnormal neurological findings (11, 22). The severity and incidence of AMS is primarily related to the initial altitude, the rate of ascent, the altitude reached, and the duration of exposure to altitude (9, 13, 16, 21, 30). Additional factors that affect the severity and incidence of AMS are the degree ... |
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| Intermittent Altitude Exposures Reduce Acute Mountain Sickness at 4300 M |
JAN 2004 |
9 pages |
| Authors:
Beth A. Beidleman; Stephen R. Muza; Charles S. Fulco; Allen Cymerman; Dan Ditzler; Dean Stulz; Janet E. Staab; Gary S. Skrinar; Steven F. Lewis; Michael N. Sawka; ARMY RESEARCH INST OF ENVIRONMENTAL MEDICINE NATICK MA THERMAL AND MOUNTAIN MEDICINE DIVISION
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| Acute mountain sickness (AMS) commonly occurs at altitudes exceeding 2000-2500 m and usually resolves after acclimatization induced by a few days of chronic residence at the same altitude. Increased ventilation and diuresis may contribute to the reduction in AMS with altitude acclimatization. The aim of the present study was to examine the effects of intermittent altitude exposures (IAE), in combination with rest and exercise training, on the incidence and severity ... |
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