Physiological Differences Between Men and Women in Exercise-Heat Tolerance and Heat Acclimation PDF Download
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Author: K. B. Pandolf
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
The responses of men to changes in environmental temperature have provided a basis for the understanding of human heat tolerance and thermoregulation. There appears to be less certainty about the thermoregulatory patterns of women. Physiological responses to heat stress may differ between genders due to several factors which include the lower cardiorespiratory fitness, higher body fat content, lower body weight, and lower skin surface area and higher surface area-to-mass ratio of women compared to men. In addition, fluctuating horminal levels of estrogen and progesterone accompanying the menstrual cycle may influence women's tolerance to heat stress. Since the US Army is currently composed of greater than 10% females, it has become necessary to examine heat responses of females to exercise-heat stress and heat acclimation. Our Institute has conducted experiments comparing men and women for exercise-heat tolerance and acclimation over a wide range of environmental conditions. Originator-supplied keywords include: gender related differences; heat acclimation; heat balance and transfer; hypohydration; physiological responses; prolonged heat exposure.
Author: K. B. Pandolf
Publisher:
ISBN:
Category :
Languages : en
Pages : 28
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Book Description
The responses of men to changes in environmental temperature have provided a basis for the understanding of human heat tolerance and thermoregulation. There appears to be less certainty about the thermoregulatory patterns of women. Physiological responses to heat stress may differ between genders due to several factors which include the lower cardiorespiratory fitness, higher body fat content, lower body weight, and lower skin surface area and higher surface area-to-mass ratio of women compared to men. In addition, fluctuating horminal levels of estrogen and progesterone accompanying the menstrual cycle may influence women's tolerance to heat stress. Since the US Army is currently composed of greater than 10% females, it has become necessary to examine heat responses of females to exercise-heat stress and heat acclimation. Our Institute has conducted experiments comparing men and women for exercise-heat tolerance and acclimation over a wide range of environmental conditions. Originator-supplied keywords include: gender related differences; heat acclimation; heat balance and transfer; hypohydration; physiological responses; prolonged heat exposure.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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Book Description
Researchers generally agree that high aerobic fitness achieved through physical training will reduce the physiological strain to exercise in the heat, but does not replace the benefits of an exercise-heat acclimation program. In addition, high aerobic fitness is hypothesized as a major factor in the small decay and rapid re-acclimation of individuals after they ceased exercising in hot environments. However, recent work from our laboratory suggests that improved aerobic fitness by physical training must be associated with significant elevations in core temperature during the training process in order to improve exercise-heat tolerance. Two recent studies comparing men and women with similar aerobic fitness indicate no major physiological differences between genders in both humid and dry heat for cardiovascular and thermoregulatory responses to these environments either before or after acclimation. Our laboratory has reported that after exercise-heat acclimation under wet conditions (mild or hot), females tolerate the heat in a more efficient fashion than males while under hot-dry conditions males seem to be at some physiological advantage. Even fewer studies are reported which evaluate physiological differences in heat tolerance to exercise in relation to age. In general, exercise-heat tolerance is reduced in pre-pubertal children (boys and girls) and older adults (men and women) compared to young men and women. However, aerobically fit older adults seem to have far fewer decrements in the performance of exercise in the heat than less fit older adults.
Author: Julien D. Périard
Publisher: Springer
ISBN: 3319935151
Category : Medical
Languages : en
Pages : 294
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Book Description
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.
Author: Committee on Military Nutrition Research
Publisher: National Academies Press
ISBN: 0309556775
Category : Technology & Engineering
Languages : en
Pages : 585
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Book Description
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.
Author: Lawrence E. Armstrong
Publisher: Human Kinetics
ISBN: 9780736037716
Category : Medical
Languages : en
Pages : 300
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Book Description
The only text to focus exclusively on heat-related illnesses. Full of practical advice for professionals in a variety of medical, academic, & commercial settings. Learn how to identify, treat & prevent exertional heat illnesses & ensure your sporting events are safe.
Author: B. A. Avellini
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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Book Description
Four men and four women with comparable maximal aerobic capacities and equal surface areas and surface area to mass ratios underwent a three hour heat stress test before and after a 10 day acclimation to humid heat. Women were tested during both pre- and post-ovulation (pre-OV, post-OV). Prior to acclimation, pre-OV women exhibited the longest tolerance times and lowest rectal temperature (TRE) and heart rates (HR) throughout testing. Men secreted considerably more sweat per unit area than did women in either phase of the cycle, yet they demonstrated shorter tolerance times and higher body temperatures and HR. During post-OV, women reacted similarly to men, although their sweat rates and HR's were significantly lower. Following acclimation, the TRE and HR of the men and women were similar while the discrepancy between the sweat rates was magnified. It was concluded that aerobic capacity is an important factor to be considered when men and women are compared in the heat. When fitness levels are similar, except for sweating, the previously reported sex-related differences in response to heat seem to disappear.
Author: National Institute for Occupational Safety and Health (U.S.)
Publisher: National Institute on Drug Abuse
ISBN: 9780160946561
Category : Health & Fitness
Languages : en
Pages : 202
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Book Description
Occupational exposure to heat can result in injuries, disease, reduced productivity, and death. To address this hazard, the National Institute for Occupational Safety and Health (NIOSH) has evaluated the scientific data on heat stress and hot environments and has updated the Criteria for a Recommended Standard: Occupational Exposure to Hot Environments [NIOSH 1986a]. This updated guidance includes information about physiological changes that result from heat stress, and relevant studies such as those on caffeine use, evidence to redefine heat stroke, and more. Related products: Weather & Climate collection is available here: https://bookstore.gpo.gov/catalog/weather-climate Emergency Management & First Responders can be found here: https://bookstore.gpo.gov/catalog/emergency-management-first-responders Fire Management collection is available here: https://bookstore.gpo.gov/catalog/fire-management
Author: R.C. Eberhart
Publisher: Springer Science & Business Media
ISBN: 1468482858
Category : Science
Languages : en
Pages : 453
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Book Description
Author:
Publisher:
ISBN:
Category : Disaster medicine
Languages : en
Pages : 0
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Book Description
Author: M. Kosaka
Publisher: Springer Science & Business Media
ISBN: 4431670351
Category : Medical
Languages : en
Pages : 556
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Book Description
This book provides a comprehensive overview of the multitude of different forms of thermotherapy in connection with aspects of thermal physiology and cell biology. The aim is to elucidate the scientific background of therapeutic actions and to promote effective new applications at the beginning of the 21st century. Significant to these purposes is cooperation between experts in the fields of thermal biology, hyper thermic oncology, rheumatology, and balneology, as represented by the editors. Emphasis has been placed on a balanced choice of contributions, in the hope that this will enable the reader to draw helpful connections between the principles and prac tice of thermotherapy. It is apparent that a wealth of published data exists concerning thermotherapy on the one hand and thermal physiology on the other. However, in the former field empirical aspects of therapeutic usefulness prevail, while in the latter, aspects of basic science are in the foreground. Accordingly, the sources where published data may be found are quite different and as a consequence many findings of potential mutual interest published in medical journals have gone unnoticed by readers of physio logical journals, and vice versa. It is hoped that this book will bridge the gap and encourage researchers' efforts to integrate the available knowledge to attain optimal coordination of clinical and theoretical aspects.
