Download or read book Exercise Countermeasures for Bed rest Deconditioning written by John Edward Greenleaf and published by . This book was released on 1993 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose for this 30-day bed-rest study was to investigate the effects of short-term, high-intensity isotonic and isokinetic exercise training on maintenance of aerobic work capacity (peak oxygen uptake); muscular strength and endurance; and orthostatic tolerance, equilibrium, and gait. Other data were collected on muscle atrophy, bone mineralization and density, endocrine analyses of vasoactivity and fluid-electrolyte balance, muscle intermediary metabolism, and performance and mood of the subjects. Nineteen men (32-42 yr) were allocated into three groups: no-exercise control (peak oxygen uptake and isokinetic tests once/wk, N = 5), isotonic exercise training (electronic Quinton ergometer, supine, N = 7), and isokinetic exercise training (electronic Lido ergometer, supine, N = 7). The exercise training regimens were conducted near peak levels for 30 min in the morning and 30 min in the afternoon 5 d/wk. The protocol consisted of a 7-d ambulatory control period during which the subjects equilibrated on the standardized diet, 30 d of 6 degrees head-down bed rest, and a final 4.5 d of ambulatory recovery. Their diet consisted of commonly available fresh and frozen foods; mean caloric consumption of 2,678 +/- SE 75 kcal/d (control), 2,833 +/- SE 82 kcal/day (isotonic), and 2,890 +/- SE 75 kcal/d (isokinetic) resulted in mean weight losses during bed rest of 1.01 kg, 0.85 kg, and 0.0 kg, respectively. The results indicated that: (1) The subjects maintained a relatively stable mood, high morale, and high esprit de corps throughout the study. Scores improved in nearly all performance and mood tests in almost all the subjects. Isotonic training, as opposed to isokinetic exercise training, was associated with decreasing levels of psychological tension, concentration, and motivation, and with improvement in the quality of sleep. (2) Peak oxygen uptake was maintained during bed rest with isotonic exercise training; it was not maintained as well with isokinetic ( -9.0%) or no-exercise ( -18.2%) training. If a 9% reduction in aerobic power is acceptable, isokinetic exercise training could be used for maintenance of strength, endurance, and the reduced aerobic capacity in astronauts during flight. (3) In general, there were few decreases in strength or endurance of arm or leg muscles during bed rest, in spite of reduction in size (atrophy) of some leg muscles. (4) There was no effect of isotonic or isokinetic exercise training on orthostasis, because tilt-table tolerances were reduced similarly from 42-53 min to 30-34 min in the three groups following bed rest. (5) Bed rest resulted in significant decreases of postural stability and self-selected step length, stride length, and walking velocity, which were not influenced by either exercise training regimen. Pre-bed-rest responses were restored by the fourth day of recovery.

Download or read book Exercise Countermeasures for Bed Rest Deconditioning written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-25 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose for this 30-day bed rest study was to investigate the effects of short-term, high intensity isotonic and isokinetic exercise training on maintenance of working capacity (peak oxygen uptake), muscular strength and endurance, and on orthostatic tolerance, posture and gait. Other data were collected on muscle atrophy, bone mineralization and density, endocrine analyses concerning vasoactivity and fluid-electrolyte balance, muscle intermediary metabolism, and on performance and mood of the subjects. It was concluded that: The subjects maintained a relatively stable mood, high morale, and high esprit de corps throughout the study. Performance improved in nearly all tests in almost all the subjects. Isotonic training, as opposed to isokinetic exercise training, was associated more with decreasing levels of psychological tension, concentration, and motivation; and improvement in the quality of sleep. Working capacity (peak oxygen uptake) was maintained during bed rest with isotonic exercise training; it was not maintained with isokinetic or no exercise training. In general, there was no significant decrease in strength or endurance of arm or leg muscles during bed rest, in spite of some reduction in muscle size (atrophy) of some leg muscles. There was no effect of isotonic exercise training on orthostasis, since tilt-table tolerance was reduced similarly in all three groups following bed rest. Bed rest resulted in significant decreases of postural stability and self-selected step length, stride length, and walking velocity, which were not influenced by either exercise training regimen. Most pre-bed rest responses were restored by the fourth day of recovery. Greenleaf, John (Editor) Ames Research Center NASA-TM-103987, A-93008, NAS 1.15:103987 RTOP 199-21-12-07...

Download or read book Bed Rest Exercise Countermeasure and Reconditioning Effects on the Human Resting Muscle Tone System written by Britt Schoenrock and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Recovery After Prolonged Bed Rest Deconditioning written by and published by . This book was released on 2003 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Musculoskeletal Tissue Regeneration written by William S. Pietrzak and published by Springer Science & Business Media. This book was released on 2008-04-11 with total page 647 pages. Available in PDF, EPUB and Kindle. Book excerpt: The repair of musculoskeletal tissue is a vital concern of all surgical specialties, orthopedics and related disciplines. Written by recognized experts, this book aims to provide both basic and advanced knowledge of the newer methodologies being developed and introduced to the clinical arena. A valuable resource for researchers, developers, and clinicians, the book presents a foundation to propel the technology and integration of the current state of knowledge into the 21st century.

Download or read book Countermeasure Development for Lumbopelvic Deconditioning in Space written by Andrew Winnard and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Physical inactivity and lumbopelvic deconditioning have been linked to increased incidence of non-specific low back pain (LBP) and spinal injury in those who are exposed to microgravity (e.g. astronauts and individuals on long-duration bed rest) and in the general population. Astronauts have an increased risk of experiencing moderate to severe LBP during microgravity exposure and herniated intervertebral discs within 1 year following spaceflight. Atrophy and reduced motor control of the lumbar multifidus (LM) and transversus abdominis (TrA) muscles resulting from periods of deconditioning are linked to non-specific LBP and spinal injury risk in both post-flight astronauts and general populations. However, voluntary recruitment of these two key muscles is difficult and presents a rehabilitation challenge. This chapter reviews the concept of spinal stability as it relates to microgravity, discusses how existing exercise countermeasures used in space do not successfully maintain lumbopelvic muscle size, and introduces the functional readaptive exercise device (FRED) that shows potential to activate the LM and TrA muscles automatically and in a tonic fashion, which has relevance to rehabilitation of both astronaut and terrestrial populations.

Download or read book Recapturing a Future for Space Exploration written by National Research Council and published by National Academies Press. This book was released on 2012-01-30 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt: More than four decades have passed since a human first set foot on the Moon. Great strides have been made in our understanding of what is required to support an enduring human presence in space, as evidenced by progressively more advanced orbiting human outposts, culminating in the current International Space Station (ISS). However, of the more than 500 humans who have so far ventured into space, most have gone only as far as near-Earth orbit, and none have traveled beyond the orbit of the Moon. Achieving humans' further progress into the solar system had proved far more difficult than imagined in the heady days of the Apollo missions, but the potential rewards remain substantial. During its more than 50-year history, NASA's success in human space exploration has depended on the agency's ability to effectively address a wide range of biomedical, engineering, physical science, and related obstacles-an achievement made possible by NASA's strong and productive commitments to life and physical sciences research for human space exploration, and by its use of human space exploration infrastructures for scientific discovery. The Committee for the Decadal Survey of Biological and Physical Sciences acknowledges the many achievements of NASA, which are all the more remarkable given budgetary challenges and changing directions within the agency. In the past decade, however, a consequence of those challenges has been a life and physical sciences research program that was dramatically reduced in both scale and scope, with the result that the agency is poorly positioned to take full advantage of the scientific opportunities offered by the now fully equipped and staffed ISS laboratory, or to effectively pursue the scientific research needed to support the development of advanced human exploration capabilities. Although its review has left it deeply concerned about the current state of NASA's life and physical sciences research, the Committee for the Decadal Survey on Biological and Physical Sciences in Space is nevertheless convinced that a focused science and engineering program can achieve successes that will bring the space community, the U.S. public, and policymakers to an understanding that we are ready for the next significant phase of human space exploration. The goal of this report is to lay out steps and develop a forward-looking portfolio of research that will provide the basis for recapturing the excitement and value of human spaceflight-thereby enabling the U.S. space program to deliver on new exploration initiatives that serve the nation, excite the public, and place the United States again at the forefront of space exploration for the global good.

Download or read book Cardiovascular Deconditioning Resulting from 28 hour Bed rest and the Efficacy of the Fluid Loading Countermeasure written by Anna Grinberg and published by . This book was released on 2010 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study tested the hypotheses that 1) 28h head-down bed-rest (HDBR) would result in significant hypovolemia and cardiovascular deconditioning, and that 2) NASA's fluid loading protocol (ingestion of 15 ml/kg water with a 1g NaCl for every 125ml of water consumed) would restore normovolemia and prevent cardiovascular deconditioning resulting from 28h HDBR.

Download or read book Encyclopedia of Bioastronautics written by Laurence R. Young and published by Springer. This book was released on 2017-01-15 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This comprehensive encyclopedia serves the needs of biomedical researchers, space mission planners and engineers, aerospace medicine physicians, graduate students, and professors interested in obtaining an up-to-date and readable introduction to bioastronautics, the science of humans in space. Following the excitement and progress of the birth of the space age in the fifties and sixties, with the successes in human space flight – culminating with the Moon landings – the field of bioastronautics retreated into the more workmanlike arena of successively longer stays in low Earth orbit. At this time, major new initiatives are ahead both in human and robotic space exploration. The International Space Station, along with the developing Chinese space station and lunar program, will permit the development and testing of the means of astronaut protection for long duration missions – eventually to Mars and its moons, as well as visits to asteroids, other NEOs, and the Lagrange points. New life support systems and innovative approaches to radiation protection beyond Earth’s magnetic field will all be developed and tested. Meanwhile, the search for extraterrestrial life, past or even present, is accelerating – with the spectacular finds of Martian water and the discovery of potentially habitable extra-solar planets. A new generation of scientists is ready to attack a new set of problems, and is in need of an efficient, accurate and searchable means of discovering the essentials of the field. This reference work also covers the challenges, past achievements, and potential solutions inherent to the safe exploration of distant space and the search for life off our planet. The entries summarize the tertiary literature and include sufficient data and illustrations to introduce each topic, while avoiding the length and detail of scientific review articles.

Download or read book Optimization of Exercise Countermeasures for Human Space Flight Lessons from Terrestrial Physiology and Operational Implementation written by Tobias Weber and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Optimization of Exercise Countermeasures for Human Space Flight Lessons from Terrestrial Physiology and Operational Implementation written by Tobias Weber and published by Frontiers Media SA. This book was released on 2020-03-04 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: Human spaceflight has required space agencies to study and develop exercise countermeasure (CM) strategies to manage the profound, multi-system adaptation of the human body to prolonged microgravity (μG). Future space exploration will present new challenges in terms of adaptation management that will require the attention of both exercise physiologists and operational experts. In the short to medium-term, all exploration missions will be realised using relatively small vehicles/habitats, with some exploration scenarios including surface operations in low (<1G) gravity conditions. The evolution of CM hardware has allowed modern-day astronauts to return to Earth with, on average, relatively moderate levels μG-induced adaptation of the musculoskeletal (MS) and cardiovascular (CV) systems. However, although the intense use of CM has attenuated many aspects of MS and CV adaptation, on an individual level, there remains wide variation in the magnitude of these changes. Innovations in CM programs have been largely engineering-driven, with new hardware providing capability for new modes of exercise and a wider range of exercise protocols, which, in turn, has facilitated the transfer of traditional, but effective, terrestrial concepts based around high frequency resistance (multiple-set, multiple repetition) and mediumintensity continuous aerobic training. As a result, International Space Station (ISS) CM specialists have focused their efforts in these domains, taking advantage of hardware innovations as and when they became available. However, terrestrial knowledge in human and exercise physiology has expanded rapidly during the lifetime of the ISS and, consequently, there is potential to optimize current approaches by re-examining terrestrial knowledge and identifying opportunities to implement this knowledge into operational practices. Current terrestrial knowledge in exercise physiology is the product of a large number of intervention studies in which the variables that contribute to the effects of physical activity (mode, frequency, duration, intensity, recovery) have been controlled and systematically manipulated. However, due to limited opportunities to perform intervention studies in both spaceflight analogues – head-down bed rest (HDBR) being considered the ‘gold standard’ – and spaceflight itself, it will not be possible to systematically investigate the contribution of these factors to the efficacy of in-flight CM. As such, it will be necessary to draw on terrestrial evidence to identify solutions/strategies that may be best suited to the constraints of exploration and prioritise specific solutions/strategies for evaluation in HDBR and in flight.

Download or read book Cardio vascular Dysfunction and Physiological Manifestations Induced by Environmental Conditions written by Marc-Antoine Custaud and published by Frontiers Media SA. This book was released on 2022-11-02 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Gravitational Physiology Aging and Medicine written by Nandu Goswami and published by Frontiers Media SA. This book was released on 2020-01-27 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Manual of Vibration Exercise and Vibration Therapy written by Jörn Rittweger and published by Springer Nature. This book was released on 2020-05-23 with total page 389 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book addresses the practical aspects of vibration exercise and vibration therapy. In addition, it describes the technical and physiological background, providing applied scientists and doctors with a deeper understanding of the therapeutic potential that vibration exercise holds. Having first emerged two decades ago, vibration exercise has since established itself as a widespread form of physical exercise, used in all rehabilitation areas. The goal of this book is to close the gap between scientific knowledge and practice. Given that occupational exposure to vibration leads to well-known unfavorable effects, the book is also dedicated to potential risks, hazards and contra-indications and of course, the application of vibration therapy in a number of specific conditions is presented in a clinically usable fashion. Given its breadth of coverage, this book will be of interest to physiotherapists and exercise scientists, but also to a wider range of physicians working in the field of rehabilitation.

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Artificial Gravity written by Gilles Clément and published by Springer Science & Business Media. This book was released on 2007-05-28 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the principle and rationale for using artificial gravity during space missions, and describes the current options proposed, including a short-radius centrifuge contained within a spacecraft. Experts provide recommendations on the research needed to assess whether or not short-radius centrifuge workouts can help limit deconditioning of physiological systems. Many detailed illustrations are included.