Cardiovascular Responses to Sustained Isometric Exercise PDF Download
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Author: Alexander Victor Ng
Publisher:
ISBN:
Category :
Languages : en
Pages : 514
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Author: Alexander Victor Ng
Publisher:
ISBN:
Category :
Languages : en
Pages : 514
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Author: Joseph Iacobellis
Publisher:
ISBN:
Category : Cardiovascular research
Languages : en
Pages : 232
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Author: Corinne Felicia Boettger
Publisher:
ISBN:
Category :
Languages : en
Pages : 98
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Book Description
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.
Author: Joseph Iacobellis
Publisher: 1977.
ISBN:
Category : Cardiovascular research
Languages : en
Pages : 232
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Author: Brain Timothy Patrick
Publisher:
ISBN:
Category :
Languages : en
Pages : 418
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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.
Author: Lusha Xiang
Publisher: Morgan & Claypool Publishers
ISBN: 1615043454
Category : Medical
Languages : en
Pages : 127
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Book Description
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
Author: Jerrold Scott Petrofsky
Publisher: Charles C. Thomas Publisher
ISBN:
Category : Health & Fitness
Languages : en
Pages : 178
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Author: Lusha Xiang
Publisher: Biota Publishing
ISBN: 1615047271
Category : Medical
Languages : en
Pages : 135
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Book Description
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.
Author: Gerald F. Fletcher
Publisher: Wiley-Blackwell
ISBN: 9780879935597
Category : Medical
Languages : en
Pages : 446
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Book Description
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."
Author: Brian Allen Thompson
Publisher:
ISBN:
Category :
Languages : en
Pages : 236
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Book Description
