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The investigation uses biomathematical modeling techniques and a computer to derive predictive formulas and other information about the incidence of altitude bends in humans with relation to prior denitrogenation, activity at altitude, and individual physiological characteristics. The models represent pertinent human functions such as respiration and metabolism, and predict the effects of changes in these functions, as induced by alterations in total pressure, work level, and denitrogenation, on the work level, and denitrogenation, on the formation and composition of bubbles in tissues. Bends is believed caused by the growth of gas bubbles in the blood and other tissues and their accumulation at specific locations, especially at the joints. The computer models are exposed to the range of conditions known to cause bends at altitude. Among other findings, model results strongly suggest that the rise in body-core temperature that accompies exercise increases the incidence of bends at altitude. Thus, techniques that control core temperature near normal at altitude may be useful preventives. (Author).
"Since its earliest days, flight has been about pushing the limits of technology and, in many cases, pushing the limits of human endurance. The human body can be the limiting factor in the design of aircraft and spacecraft. Humans cannot survive unaided at high altitudes. There have been a number of books written on the subject of spacesuits, but the literature on the high-altitude pressure suits is lacking. This volume provides a high-level summary of the technological development and operational use of partial- and full-pressure suits, from the earliest models to the current high altitude, full-pressure suits used for modern aviation, as well as those that were used for launch and entry on the Space Shuttle. The goal of this work is to provide a resource on the technology for suits designed to keep humans alive at the edge of space."--NTRS Web site.
With the invention of compressed air in the 1840s, human divers could enter previously inaccessible deep water environments and engineers could design underwater mines and monumental bridges that had never been possible before. But a painful, sometimes fatal illness--decompression sickness, or the bends--mysteriously afflicted many of those who used compressed air. This book is a wide-ranging history of the wonders compressed air brought about and the suffering its unknown hazards inflicted. John L. Phillips explores the intertwining roles of science, technology, engineering, medicine, and politics in the invention of compressed air, the recognition and identification of decompression sickness, and the hundred-year-long process of learning to understand and treat the bends. The book begins with an overview of the biology and chemistry of respiration and a discussion of the steam engine that could generate compressed air. Drawing on previously unpublished letters, diaries, and notes, Phillips tells the story of early uses of compressed air, first observations of decompression sickness, growing awareness of the bends during construction of the Brooklyn Bridge, and efforts to understand the pathophysiology of the illness. He then considers employee health and safety issues, the science of diving today, and human limits to exploring the ocean deeps. In the history of compressed air and its illnesses, Phillips finds important lessons for dealing with other diseases yet to be confronted in the modern world.
Management of High Altitude Pathophysiology presents a comprehensive overview on the various therapeutic practices and ongoing research relating to the development of more potent and novel formulations for managing high altitude pathophysiology. It provides a detailed application of both herbal and non-herbal therapeutic agents, including their nanoformulations. This important reference provides benefits to the medical and herbal scientific communities, doctors treating patients with high altitude complications, individuals travelling to high altitudes for recreation or work, and scientists working on future drug development. Provides the recent advances and potential therapeutic agents for ameliorating the high-altitude complications Includes herbal remedies for the prophylaxis and treatment of the high-altitude maladies Elucidates the significance of Yogic practices and ergonomics in managing stress at high altitude
What Doesn't Kill Us, a New York Times bestseller, traces our evolutionary journey back to a time when survival depended on how well we adapted to the environment around us. Our ancestors crossed deserts, mountains, and oceans without even a whisper of what anyone today might consider modern technology. Those feats of endurance now seem impossible in an age where we take comfort for granted. But what if we could regain some of our lost evolutionary strength by simulating the environmental conditions of our ancestors? Investigative journalist and anthropologist Scott Carney takes up the challenge to find out: Can we hack our bodies and use the environment to stimulate our inner biology? Helping him in his search for the answers is Dutch fitness guru Wim Hof, whose ability to control his body temperature in extreme cold has sparked a whirlwind of scientific study. Carney also enlists input from an Army scientist, a world-famous surfer, the founders of an obstacle course race movement, and ordinary people who have documented how they have cured autoimmune diseases, lost weight, and reversed diabetes. In the process, he chronicles his own transformational journey as he pushes his body and mind to the edge of endurance, a quest that culminates in a record-bending, 28-hour climb to the snowy peak of Mt. Kilimanjaro wearing nothing but a pair of running shorts and sneakers. An ambitious blend of investigative reporting and participatory journalism, What Doesn’t Kill Us explores the true connection between the mind and the body and reveals the science that allows us to push past our perceived limitations.
Human error is cited as a major cause in over 70% of accidents, andit is widely agreed that a better understanding of humancapabilities and limitations - both physical and psychological -would help reduce human error and improve flight safety. This book was first published when the UK Civil AviationAuthority introduced an examination in human performance andlimitations for all private and professional pilot licences. Nowthe Joint Aviation Authorities of Europe have published a newsyllabus as part of their Joint Aviation Requirements for FlightCrew Licensing. The book has been completely revised and rewritten to takeaccount of the new syllabus. The coverage of basic aviationpsychology has been greatly expanded, and the section on aviationphysiology now includes topics on the high altitude environment andon health maintenance. Throughout, the text avoids excessive jargonand technical language. "There is no doubt that this book provides an excellent basicunderstanding of the human body, its limitations, the psychologicalprocesses and how they interact with the aviation environment. I amcurrently studying for my ATPL Ground Exams and I found this bookto be an invaluable aid. It is equally useful for those studyingfor the PPL and for all pilots who would like to be reminded oftheir physiological and psychological limitations." –General Aviation, June 2002
* Cutting-edge information on how to prevent, diagnose, and treat altitude illness and hypoxia in everyday life * Interweaves fascinating research discoveries with dramatic first-person accounts * Authored by a celebrated mountaineer and physician who pioneered research in the field From the time of his historic expedition to Nanda Devi in the high Himalaya, Charles Houston, M.D., was fascinated by the effects of altitude on the human body. Why do people get sick in the mountains? What are the symptoms of hypoxia -- lack of sufficient oxygen -- that also occurs in everyday life, sometimes chronically due to disease? How can we decrease the incidence of illness and death? This edition incorporates current research on the effects of altitude on humans, and Houston (now deceased) joined forces with an educator and a medical writer in a text made even more accessible for the average reader while retaining the depth of material of particular use to the medical community. This edition of this seminal text added chapters on vision and the eye at altitude, chronic and subacute altitude illness, and the limits to work at altitude (with implications for athletic training). It presents information on genetics and gender differences and more on flight and space travel, on understanding and treating sea-level hypoxic illnesses, and on who can (or should not) go to high altitude, and much more. With an expanded glossary of terms.
Sudden, extreme deaths have always fascinated us-- and now more than ever as athletes and travelers rise to the challenges of high-risk sports and journeys on the edge. In this spellbinding book, veteran travel and outdoor sports writer Peter Stark reenacts the dramas of what happens inside our bodies, our minds, and our souls when we push ourselves to the absolute limits of human endurance. Combining the adrenaline high of extreme sports with the startling facts of physiological reality, Stark narrates a series of outdoor adventure stories in which thrill can cross the line to mortal peril. Each death or brush with death is at once a suspense story, a cautionary tale, and a medical thriller. Stark describes in unforgettable detail exactly what goes through the mind of a cross-country skier as his body temperature plummets-- apathy at ninety-one degrees, stupor at ninety. He puts us inside the body of a doomed kayaker tumbling helplessly underwater for two minutes, five minutes, ten minutes. He conjures up the physiology of a snowboarder frantically trying not to panic as he consumes the tiny pocket of air trapped around his face under thousands of pounds of snow. These are among the dire situations that Stark transforms into harrowing accounts of how our bodies react to trauma, how reflexes and instinct compel us to fight back, and how, why, and when we let go of our will to live. In an increasingly tamed and homogenized world, risk is not only a means of escape but a path to spirituality. As Peter Stark writes, "You must try to understand death intimately and prepare yourself for death in order to live a full and satisfying life." In this fascinating, informative book, Stark reveals exactly what we’re getting ourselves into when we choose to live-- and die-- at the extremes of endurance.