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Influence Of Heat Stress And Acclimation On Maximal Aerobic Power
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Book Synopsis Influence of Heat Stress and Acclimation on Maximal Aerobic Power by : Michael N. Sawka
Download or read book Influence of Heat Stress and Acclimation on Maximal Aerobic Power written by Michael N. Sawka and published by . This book was released on 1984 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thirteen male volunteers performed cycle ergometer maximal oxygen uptake (V02 max) tests in moderate (21 C, 30% rh) and hot (49 C, 20% rh) environments, before and after a nine-day heat acclimation program. This program resulted in significantly decreased (P0.01) final heart rate (24 bt/min) and rectal temperature (0.4 C) from the first to last day of acclimation. The V02 max was lower (P
Book Synopsis Thermoregulatory Competence During Exercise Transients in a Group of Heat-Acclimated Young and Middle-Aged Men is Influenced More Distinctly by Maxima Aerobic Power Than Age by :
Download or read book Thermoregulatory Competence During Exercise Transients in a Group of Heat-Acclimated Young and Middle-Aged Men is Influenced More Distinctly by Maxima Aerobic Power Than Age written by and published by . This book was released on 1989 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A fundamental change that occurs with advancing age is a diminishing maximal aerobic power (VO2 max). In sedentary individuals the rate of decline in VO2 max as a function of age is estimated at 10% per ten years after age 20 but becomes more gradual in endurance-trained individuals regardless of gender, approaching about 5% with each ten year span. It is thought that reduced sweating and vasomotor responses to heat stress indicate deterioration in thermoregulatory function. A scrutiny of thermoregulatory mechanisms in the aging process is necessary because other quantitative studies of actual efferent thermoregulatory drive point to a maintenance of thermoregulatory competence well into the sixth decade of life provided a level of aerobic fitness is sustained. Pandolf et al studied a group of nine young and nine middle-aged men having parallel body weights, skin surface areas, percent body fat and maximal aerobic power. These groups displayed almost equivalent thermoregulatory responses to comparable exercise and heat stress conditions following 10-days of heat acclimation. The present paper is an examination of the above study's thermoregulatory responses during exercise transients. Transient analysis to specific exercise/ heat stress provocation provides a clearer understanding of the influence of age and aerobic fitness on thermoregulatory control of sweating than steady-state analysis. Keywords: Ageing; Body temperature control; Exercise physiology.
Book Synopsis Heat Stress in Sport and Exercise by : Julien D. Périard
Download or read book Heat Stress in Sport and Exercise written by Julien D. Périard and published by Springer. This book was released on 2019-03-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book is designed to provide a flowing description of the physiology of heat stress, the illnesses associated with heat exposure, recommendations on optimising health and performance, and an examination of Olympic sports played in potentially hot environmental conditions. In the first section the book examines how heat stress effects performance by outlining the basics of thermoregulation and how these responses impact on cardiovascular, central nervous system, and skeletal muscle function. It also outlines the pathophysiology and treatment of exertional heat illness, as well as the role of hydration status during exercise in the heat. Thereafter, countermeasures (e.g. cooling and heat acclimation) are covered and an explanation as to how they may aid in decreasing the incidence of heat illness and minimise the impairment in performance is provided. A novel and particular feature of the book is its inclusion of sport-specific chapters in which the influence of heat stress on performance and health is described, as well as strategies and policies adopted by the governing bodies in trying to offset the deleterious role of thermal strain. Given the breadth and scope of the sections, the book will be a reference guide for clinicians, practitioners, coaches, athletes, researchers, and students.
Book Synopsis Nutritional Needs in Cold and High-Altitude Environments by : Institute of Medicine
Download or read book Nutritional Needs in Cold and High-Altitude Environments written by Institute of Medicine and published by National Academies Press. This book was released on 1996-05-15 with total page 584 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reviews the research pertaining to nutrient requirements for working in cold or in high-altitude environments and states recommendations regarding the application of this information to military operational rations. It addresses whether, aside from increased energy demands, cold or high-altitude environments elicit an increased demand or requirement for specific nutrients, and whether performance in cold or high-altitude environments can be enhanced by the provision of increased amounts of specific nutrients.
Book Synopsis Heat Acclimation, Aerobic Fitness, and Hydration Effects on Tolerance During Uncompensable Heat Stress by :
Download or read book Heat Acclimation, Aerobic Fitness, and Hydration Effects on Tolerance During Uncompensable Heat Stress written by and published by . This book was released on 1998 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to determine the separate and combined effects of aerobic fitness, short-term heat acclimation, and hypohydration on tolerance during light exercise while wearing nuclear, biological, and chemical (NBC) protective clothing in the heat. Men who were moderately fit and highly fit were tested while they were euhydrated or hypohydrated through exercise & fluid restriction the day preceding the trials. Tests were conducted before and after 2 weeks of daily heat acclimation while wearing the NBC protective clothing. Results are presented & discussed with regard to: the effect of heat acclimation on sweat rate and skin & rectal temperature, tolerance time, and heart rate; effect of hypohydration on heart rate, respiratory exchange ratio, and tolerance time; and the degree of improvement in exercise-heat tolerance due to long-term aerobic fitness.
Book Synopsis Human Performance Physiology and Environmental Medicine at Terrestrial Extremes by : Kent B. Pandolf
Download or read book Human Performance Physiology and Environmental Medicine at Terrestrial Extremes written by Kent B. Pandolf and published by . This book was released on 1988 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Acclimation for Special Populations by : Caroline Sunderland
Download or read book Heat Acclimation for Special Populations written by Caroline Sunderland and published by Frontiers Media SA. This book was released on 2020-09-17 with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis Sport and Physical Activity in the Heat by : Douglas J. Casa
Download or read book Sport and Physical Activity in the Heat written by Douglas J. Casa and published by Springer. This book was released on 2018-02-19 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: This unique book is the first of its kind to specifically explore the science, medicine, challenges and successful experiences of assisting those who must perform and thrive in hot conditions, with an eye toward maximizing both performance and safety. Beginning with both human and comparative physiology as it relates to coping with the heat, key concepts are subsequently elaborated, including heat acclimatization, work-to-rest ratios, hydration, sleep, the effects of altitude, and the use of drugs and supplements. The sections that follow discuss heat-related considerations in individual and team sports and other populations, monitoring techniques, and medical and legal issues. Athletes, warfighters and laborers are often forced to perform intense physical activity in the heat as a part of their jobs or lifestyle. The process of properly preparing for this challenge is multifaceted and often not fully understood or utilized. Sport and Physical Activity in the Heat is an excellent resource for team physicians, high-level coaches, serious athletes, athletic trainers, exercise scientists, strength and conditioning coaches, industrial hygienists, military commanders, or anyone involved in the process of maximizing performance and safety during exercise in the heat for the athlete, warfighter, or laborer.
Book Synopsis Heat Acclimation, Aerobic Fitness, and Hydration Effects on Tolerance During Uncompsensable Heat Stress by : Stephen S. Cheung
Download or read book Heat Acclimation, Aerobic Fitness, and Hydration Effects on Tolerance During Uncompsensable Heat Stress written by Stephen S. Cheung and published by . This book was released on 1998* with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Heat Acclimation Improves Exercise Performance by :
Download or read book Heat Acclimation Improves Exercise Performance written by and published by . This book was released on 2010 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examined the impact of heat acclimation on improving exercise performance in cool and hot environments. Twelve trained cyclists performed tests of maximal aerobic power (VO2max), time-trial performance, and lactate threshold, in both cool [13 deg C, 30% relative humidity (RH)] and hot (38 deg C, 30% RH) environments before and after a 10-day heat acclimation (~50%VO2max in 40 deg C) program. The hot and cool condition VO2max and lactate threshold tests were both preceded by either warm (41 deg C) water or thermoneutral (34 deg C) water immersion to induce hyperthermia (0.8 -1.0 deg C) or sustain normothermia, respectively. Eight matched control subjects completed the same exercise tests in the same environments before and after 10 days of identical exercise in a cool (13 deg C) environment.
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 968 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Developing an Improved Understanding of the Biophysical and Physiological Determinants of Steady-State Sweating During Exercise in the Heat by : Nicholas Morris Ravanelli
Download or read book Developing an Improved Understanding of the Biophysical and Physiological Determinants of Steady-State Sweating During Exercise in the Heat written by Nicholas Morris Ravanelli and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Four studies were performed to evaluate the independent influence of core temperature and heat acclimation on sweating responses when exercise is fixed for a given evaporative heat balance requirement (Ereq) during compensable and uncompensable heat stress. By using circadian rhythm to modulate absolute core temperature, study 1 investigated whether absolute core temperature altered the steady-state sweat rate during compensable heat stress at a fixed Ereq. Study 2 compared the influence of partial and complete heat acclimation on core temperature and sweating responses between a compensable and uncompensable heat stress condition. Study 3 quantified how maximum skin wettedness is altered with partial or complete heat acclimation. Study 4 determined whether aerobic fitness (i.e. maximum rate of oxygen consumption; VO2max) per se independently alters the sweating and core temperature responses to uncompensable heat stress or if the frequent bouts of exercise-induced heat stress that accompany aerobic training are required to augment thermoregulatory capacity. Study 1 demonstrated that when absolute core temperature is different between AM and PM by ~0.2°C, steady-state sweat rates were the same for a fixed Ereq. Only when a different level of Ereq was attained, were differences in steady-state sweating observed. Moreover, steady-state sweat rates were similar despite differences in skin and core temperature when exercise intensity was matched to elicit a fixed Ereq in two different ambient temperatures (23°C and 33°C). In study 2, neither partial nor complete heat acclimation altered the core temperature response to compensable heat stress despite a marginally greater sweat rate compared to an unacclimated state. However, the sudomotor adaptations associated with heat acclimation were evident during uncompensable heat stress and mitigated the rise in core temperature during 60 minutes of exercise compared to an unacclimated state. Study 3 determined that the biophysical parameter that defines the upper limit for evaporative heat loss, that is the maximum skin wettedness achievable, increased following partial (0.84±0.08) and complete heat acclimation (0.95±0.05) compared to unacclimated (0.72±0.06) which directly explains the reduced change in core temperature reported in study 2 during uncompensable heat stress. Lastly, study 4 demonstrated that VO2max per se does not alter the sudomotor responses to uncompensable heat stress. Rather, it is the repetitive exercise-induced heat stress experienced during aerobic training that induces a partial heat acclimation thereby mitigating the rise in core temperature during uncompensable heat stress. Taken together, when exercise is prescribed in a compensable environment, the steady-state sweat rate observed will be primarily determined by Ereq independent of absolute core temperature, while heat acclimation will slightly increase the sweat rate despite providing no additional reduction in the change in core temperature. However, progressive heat acclimation increases the upper limit of compensability via a greater maximum skin wettedness thereby mitigating the rise in core temperature during uncompensable heat stress.
Book Synopsis Medical Aspects of Harsh Environments by : Kent B. Pandolf
Download or read book Medical Aspects of Harsh Environments written by Kent B. Pandolf and published by U.S. Government Printing Office. This book was released on 2001 with total page 648 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes and illustrates the medical conditions caused by heat and cold, including topics ranging from heat illness prevention to the treatment of hypothermia. Provides historical background and current information on the physiology, physical derangements, psychology, prevention, and treatment of heat- and cold-related environmental illnesses and injuries. Contains a color atlas of cold injuries and their treatment.
Author :Stephen Sau-Shing Cheung Publisher :National Library of Canada = Bibliothèque nationale du Canada ISBN 13 :9780612351240 Total Pages :418 pages Book Rating :4.3/5 (512 download)
Book Synopsis The Thermophysiology of Uncompensable Heat Stress [microform] : Influence of Hydration Status, Fluid Replacement, Aerobic Training, Physical Fitness, and Heat Acclimation by : Stephen Sau-Shing Cheung
Download or read book The Thermophysiology of Uncompensable Heat Stress [microform] : Influence of Hydration Status, Fluid Replacement, Aerobic Training, Physical Fitness, and Heat Acclimation written by Stephen Sau-Shing Cheung and published by National Library of Canada = Bibliothèque nationale du Canada. This book was released on 1998 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Committee on Military Nutrition Research by : Institute of Medicine
Download or read book Committee on Military Nutrition Research written by Institute of Medicine and published by National Academies Press. This book was released on 1999-08-04 with total page 303 pages. Available in PDF, EPUB and Kindle. Book excerpt: The activities of the Food and Nutrition Board's Committee on Military Nutrition Research (CMNR, the committee) have been supported since 1994 by grant DAMD17-94-J-4046 from the U.S. Army Medical Research and Materiel Command (USAMRMC). This report fulfills the final reporting requirement of the grant, and presents a summary of activities for the grant period from December 1, 1994 through May 31, 1999. During this grant period, the CMNR has met from three to six times each year in response to issues that are brought to the committee through the Military Nutrition and Biochemistry Division of the U.S. Army Research Institute of Environmental Medicine at Natick, Massachusetts, and the Military Operational Medicine Program of USAMRMC at Fort Detrick, Maryland. The CMNR has submitted five workshop reports (plus two preliminary reports), including one that is a joint project with the Subcommittee on Body Composition, Nutrition, and Health of Military Women; three letter reports, and one brief report, all with recommendations, to the Commander, U.S. Army Medical Research and Materiel Command, since September 1995 and has a brief report currently in preparation. These reports are summarized in the following activity report with synopses of additional topics for which reports were deferred pending completion of military research in progress. This activity report includes as appendixes the conclusions and recommendations from the nine reports and has been prepared in a fashion to allow rapid access to committee recommendations on the topics covered over the time period.
Download or read book The Hot Brain written by Carl V. Gisolfi and published by MIT Press. This book was released on 2000 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book traces the story of the brain throughout evolution and shows how the control of body temperature as a survival mechanism was achieved.
Book Synopsis Nutritional Needs in Hot Environments by : Institute of Medicine
Download or read book Nutritional Needs in Hot Environments written by Institute of Medicine and published by National Academies Press. This book was released on 1993-02-01 with total page 393 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume examines the current state of knowledge concerning the influence of a hot environment on nutrient requirements of military personnel. A parallel concern is ensuring that performance does not decline as a result of inadequate nutrition. The committee provides a thorough review of the literature in this area and interprets the diverse data in terms of military applications. In addition to a focus on specific nutrient needs in hot climates, the committee considers factors that might change food intake patterns and therefore overall calories. Although concern for adequate nutrition for U.S. soldiers in Saudi Arabia prompted the initiation of this project, its scope includes the nutrient needs of individuals who may be actively working in both hot-dry and hot-moist climates.
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