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Musculoskeletal-induced nucleation in altitude decompression sickness (Document No: 20140003297)
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Conkin, J. Natoli, M. J. Wessel II, J. H. Pollock, N. W. Gernhardt, M. L. |
| Copyright Year | 2014 |
| Description | Musculoskeletal activity has the potential to both improve and compromise decompression safety. Exercise enhances inert gas elimination during oxygen breathing prior to decompression (prebreathe), but it may also promote bubble nuclei formation (nucleation), which can lead to gas phase separation and bubble growth and increase the risk of decompression sickness (DCS). The timing, pattern and intensity of musculoskeletal activity and the level of tissue supersaturation may be critical to the net effect. There are limited data available to evaluate cost-benefit relationships. Understanding the relationship is important to improve our understanding of the underlying mechanisms of nucleation in exercise prebreathe protocols and to quantify risk in gravity and microgravity environments. Data gathered during NASA's Prebreathe Reduction Program (PRP) studies combined oxygen prebreathe and exercise followed by low pressure (4.3 psi; altitude equivalent of 30,300 ft [9,235 m]) microgravity simulation to produce two protocols used by astronauts preparing for extravehicular activity. Both the Phase II/CEVIS (cycle ergometer vibration isolation system) and ISLE (in-suit light exercise) trials eliminated ambulation to more closely simulate the microgravity environment. The CEVIS results (35 male, 10 female) serve as control data for this NASA/Duke study to investigate the influence of ambulation exercise on bubble formation and the subsequent risk of DCS. |
| File Size | 15630 |
| Page Count | 2 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140003297 |
| Archival Resource Key | ark:/13960/t18m29m09 |
| Language | English |
| Publisher Date | 2014-02-12 |
| Access Restriction | Open |
| Subject Keyword | Aerospace Medicine Physical Exercise Musculoskeletal System Gas-liquid Interactions Gravitation Nucleation Decompression Sickness Risk Safety Oxygen Breathing Microgravity Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
