Download or read book Cardiovascular Responses to Sustained Isometric Exercise written by Alexander Victor Ng and published by . This book was released on 1990 with total page 514 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cardiovascular Responses to Sustained Isometric Work in a Hot Environment written by Joseph Iacobellis and published by . This book was released on 1977 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cardiovascular Responses to Isometric Exercise of Constant Force Or Constant EMG Activity written by Corinne Felicia Boettger and published by . This book was released on 1998 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cardiovascular system has feedforward and feedback systems regulating cardiovascular responses. It is uncertain whether these responses are dependent upon muscle mass, fatigue, or force. To determine whether cardiovascular responses to isometric exercise of a given relative force are dependent upon the mass of muscle, 20 college-aged subjects performed four 5-minute bouts of exercise. Isometric exercise with the forearm and the quadriceps at 20% MVC was performed, maintaining constant force (CF) or constant EMG activity (CE). CE represents constant central command (CC) and that CF represents increasing muscle activity, or CC. Force and EMG activity were visually displayed on a monitor. Heart rate (HR), mean arterial pressure (MAP), calf blood flow (CBF), and calf vascular conductance (CVC) wereassessed.
Download or read book Cardiovascular Responses to Sustained Isometric Work in a Hot Environment written by Joseph Iacobellis and published by 1977.. This book was released on 1977 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cardiovascular Responses to Sustained Isometric Force Production of the Finger Flexor and Knee Extensor Muscle Groups in Weight trained and Untrained Young Men written by Brain Timothy Patrick and published by . This book was released on 1992 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt: The purpose of this study was to investigate whether the cardiovascular responses to isometric force production differed significantly between weight-trained and untrained men. Thus, the cardiovascular responses to sustained isometric force production were investigated in 17 weight-trained (age = 23.5 $pm$ 2.9 yrs.) and 17 untrained (age = 25.8 $pm$ 4.1 yrs.) healthy, young men. Systolic blood pressure (SBP), diastolic blood pressure (DBP), heart rate (HR), and stroke volume (SV) were measured, with the subject sitting, every 30 seconds during one minute of rest, during isometric force production at 40% of maximal force production by the right finger flexors (FF) and right knee extensors (KE) to muscle fatigue, and during one minute of recovery. Moreover, mean arterial blood pressure (MAP = SBP $-$ DBP/3 + DBP), cardiac output (CO = HR $times$ SV), and total peripheral resistance (TPR = MAP/CO) were derived for each recording period. Multivariate analysis of variance (MANOVA) was used to statistically analyze the significance (p $le$.05) of the mean differences between subject groups (weight-trained and untrained) and muscle groups (finger flexors and knee extensors) for the changes in the dependent variables, from rest to 30 seconds of sustained isometric force production, and from rest to fatigue. The changes in blood pressures, HR, and SV, from rest to 30 seconds of isometric force production were not significantly different between weight-trained and untrained subjects; however, changes in CO were significantly greater while changes in TPR were significantly smaller in the weight-trained compared to the untrained men. Changes from rest to fatigue in blood pressure were not significantly different between subject groups. However, the changes in CO, from rest to fatigue, were significantly larger while the changes in TPR were significantly smaller in the weight-trained compared to the untrained subjects during both finger flexion and knee extension exercises. The differences in CO and TPR responses between subject groups might indicate differences in the neural mechanisms which regulate the cardiovascular responses to sustained isometric force production. The changes in blood pressure, HR, and CO, from rest to 30 seconds of sustained isometric force production, were significantly greater during knee extension compared to finger flexion; however, at fatigue, only the changes in HR and CO were significantly different (KE $>$ FF) between tasks. The differences between tasks in the HR and CO responses to sustained isometric force production might be due to differences in the amount of active muscle mass, and thus, differences in the blood flow requirements.
Download or read book Cardiovascular Responses to Exercise written by Lusha Xiang and published by Morgan & Claypool Publishers. This book was released on 2012 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exercise is the act of increasing metabolic rate for the purpose of enhancing physical fitness. Exercise can be one of the most stressful physiological responses that the body undertakes. With exercise, there are increases in metabolic rate, heart rate, blood flow (hyperemia), respiration, and heat production. The increased metabolic requirement during exercise is well met by an increased blood flow (functional hyperemia) and oxygen supply to the exercising tissue, which is regulated by multiple local and systemic mechanisms. The local mechanisms (factors) are responsible for mediating the muscle homeostasis and vascular conductance to match the increased metabolic requirement, whereas the systemic mechanisms are responsible for the maintenance of blood pressure and global cardiovascular homeostasis, including the increase in and redistribution of cardiac output, which is mainly mediated by sympathetic activation. For instance, the substantial decreases in vascular resistance and resultant large increase in blood flow during exercise require higher blood pressure and more cardiac output, such that the metabolically active muscle can be perfused with adequate blood flow. This book will provide an overview of the cardiovascular responses to exercise under physiological conditions as well as some pathological circumstances. Table of Contents: Capillary Perfusion in Skeletal Muscle During Exercise / Local Control of Arteriolar Diameter and Blood Flow During Exercise / Systemic Control of Cardiovascular Response to Exercise / Cardiovascular Response to Exercise under Pathological Conditions / References / Author Biography
Download or read book Isometric Exercise and Its Clinical Implications written by Jerrold Scott Petrofsky and published by Charles C. Thomas Publisher. This book was released on 1982 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cardiovascular Responses to Exercise written by Lusha Xiang and published by Biota Publishing. This book was released on 2016-12-01 with total page 135 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exercise is the act of increasing metabolic rate for the purpose of enhancing physical fitness. Exercise can be one of the most stressful physiological responses that the body undertakes. With exercise, there are increases in metabolic rate, heart rate, blood flow (hyperemia), respiration, and heat production. The increased metabolic requirement during exercise is well met by an increased blood flow (functional hyperemia) and oxygen supply to the exercising tissue, which is regulated by multiple local and systemic mechanisms. The local mechanisms (factors) are responsible for mediating the muscle homeostasis and vascular conductance to match the increased metabolic requirement, whereas the systemic mechanisms are responsible for the maintenance of blood pressure and global cardiovascular homeostasis, including the increase in and redistribution of cardiac output, which is mainly mediated by sympathetic activation. For instance, the substantial decreases in vascular resistance and resultant large increase in blood flow during exercise require higher blood pressure and more cardiac output, such that the metabolically active muscle can be perfused with adequate blood flow. This book will provide an overview of the cardiovascular responses to exercise under physiological conditions as well as some pathological circumstances.
Download or read book Cardiovascular Response to Exercise written by Gerald F. Fletcher and published by Wiley-Blackwell. This book was released on 1994 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt: The third edition of this popular and successful text has been fully revised and updated to take account of recent advances in the field, particularly in the physiology and pathophysiology of many disease processes. The text retains the original format of relevant physiology, test selection and test interpretation by case example. Essential aspects of paediatric chemical pathology, inborn errors of metabolism, reproductive endocrinology, tumours and toxicology are now included. As chemical pathology is receiving specific attention in medical courses, this text has been adapted to present this information in an understandable form, making it suitable for medical undergraduates and for medical and science postgraduates studying for exams of Colleges of Pathology and professional associations."
Download or read book Control of the Cardiovascular and Respiratory Systems in Health and Disease written by C. Tissa Kappagoda and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: On April 8-9, 1994, a symposium entitled Control of the Cardiovascular and Respiratory Systems in Health and Disease was held at the University of California Davis Medical Center in Sacramento. The purpose of this symposium was to honor the careers of Professors Hazel M. and John C. G. Coleridge. Participants in this symposium came from throughout the world. Their attendance at the symposium was a symbol of great respect and affection for the honorees. The Professors Coleridge have made many important contribu tions to the scientific literature concerning neural control of the cardiovascular and respira tory systems. In addition, they have made remarkable contributions to the lives of other scientists working in this field of investigation. Some of us have known them as mentors, counselors, friends, and supervisors; others have known them as co-investigators. Most importantly, all of us have known them as friends. This book, which contains the proceedings of the symposium, is dedicated to Hazel and John Coleridge. C. T. Kappagoda M. P. Kaufman v ACKNOWLEDGMENTS We wish to acknowledge the financial support of the following agencies for making this symposium a reality: • Astra Merck Group (Tarek Ackad, M. D. , Ph. D. ) • Boehringer Ingelheim Pharmaceuticals, Inc. (Ms. Kathryn B. Lucas and Mr. Allan Holloway) • Bristol-Myers Squibb (David L. Cram, Jr. , Pharm. D. ) • Marion/Merrrell Dow, Inc. (Mr. Brian Scheffield) • Merck and Company (Mr. Johnathan Sakakibara) • Pfizer Laboratories (Mr.
Download or read book Cardiovascular Responses to Voluntary and Nonvoluntary Combination Isometric Exercise of the Quadriceps Musculature written by Brian Allen Thompson and published by . This book was released on 1994 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Neural Mechanisms of Cardiovascular Regulation written by Nae J. Dun and published by Springer Science & Business Media. This book was released on 2011-06-27 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt: Neural Mechanisms of Cardiovascular Regulation responds to current questions about how neurons in the central and peripheral nervous systems regulate the cardiovascular system. It includes a series of thoughtful reviews that are intended to provoke and illuminate the reader, with the intention of revealing some of the ideas that current practitioners in the field of cardiovascular research are using to generate their current studies.
Download or read book Effects of Isometric Training on Cardiovascular Responses to Aerobic Exercise written by Jill Marie Dansand and published by . This book was released on 1998 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Static Isometric Exercise written by Harry S. Moss Heart Center and published by . This book was released on 1981 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Role of Muscle Afferents in the Cardiovascular Response to Isometric Exercise in Humans written by James Patrick Fisher and published by . This book was released on 2004 with total page 221 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cardiovascular and Respiratory Responses to Muscular Activity During Immersion in Water at Different Temperatures written by A. R. Lind and published by . This book was released on 1984 with total page 18 pages. Available in PDF, EPUB and Kindle. Book excerpt: The thrust of this research program was to investigate muscular function during both sustained and intermittent isometric contractions as well as during rhythmic exercise carried out in air or during immersion of subjects to the neck in water at temperatures ranging from 15 C to 35 C. In one experiment the subjects were examined when they were completely under water. The limitations placed on muscular function in those varied circumstances may be related to the limits of flexibility of the cardiovascular and respiratory systems, to the temperature of the muscles and to the metabolic demands in aerobic, anaerobic and fatiguing exercise. Such events may place unexpected demands on both cardiovascular and respiratory function. Isometric exercise, either sustained or intermittent, was chosen to simulate carrying weights underwater, while bicycling, with the legs horizontal was chosen to approximate swimming. Studies were carried out to evaluate the changes that occur as a result of habituation to immersion in cold water. In addition, the mechanisms that compete for the local control of the circulation were examined during intermittent isometric contractions leading to muscular fatigue.
Download or read book Skeletal Muscle Circulation written by Ronald J. Korthuis and published by Morgan & Claypool Publishers. This book was released on 2011 with total page 147 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of this treatise is to summarize the current understanding of the mechanisms for blood flow control to skeletal muscle under resting conditions, how perfusion is elevated (exercise hyperemia) to meet the increased demand for oxygen and other substrates during exercise, mechanisms underlying the beneficial effects of regular physical activity on cardiovascular health, the regulation of transcapillary fluid filtration and protein flux across the microvascular exchange vessels, and the role of changes in the skeletal muscle circulation in pathologic states. Skeletal muscle is unique among organs in that its blood flow can change over a remarkably large range. Compared to blood flow at rest, muscle blood flow can increase by more than 20-fold on average during intense exercise, while perfusion of certain individual white muscles or portions of those muscles can increase by as much as 80-fold. This is compared to maximal increases of 4- to 6-fold in the coronary circulation during exercise. These increases in muscle perfusion are required to meet the enormous demands for oxygen and nutrients by the active muscles. Because of its large mass and the fact that skeletal muscles receive 25% of the cardiac output at rest, sympathetically mediated vasoconstriction in vessels supplying this tissue allows central hemodynamic variables (e.g., blood pressure) to be spared during stresses such as hypovolemic shock. Sympathetic vasoconstriction in skeletal muscle in such pathologic conditions also effectively shunts blood flow away from muscles to tissues that are more sensitive to reductions in their blood supply that might otherwise occur. Again, because of its large mass and percentage of cardiac output directed to skeletal muscle, alterations in blood vessel structure and function with chronic disease (e.g., hypertension) contribute significantly to the pathology of such disorders. Alterations in skeletal muscle vascular resistance and/or in the exchange properties of this vascular bed also modify transcapillary fluid filtration and solute movement across the microvascular barrier to influence muscle function and contribute to disease pathology. Finally, it is clear that exercise training induces an adaptive transformation to a protected phenotype in the vasculature supplying skeletal muscle and other tissues to promote overall cardiovascular health. Table of Contents: Introduction / Anatomy of Skeletal Muscle and Its Vascular Supply / Regulation of Vascular Tone in Skeletal Muscle / Exercise Hyperemia and Regulation of Tissue Oxygenation During Muscular Activity / Microvascular Fluid and Solute Exchange in Skeletal Muscle / Skeletal Muscle Circulation in Aging and Disease States: Protective Effects of Exercise / References
