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Near infrared spectroscopy is currently routinely used to assess tissue (muscle) oxygenation at rest and during exercise. While most investigators assume that hemoglobin ([Hb]) is the major contributor to the responses seen during exercise, the relative contribution of myoglobin ([Mb]) to the NIRS signals remains controversial. PURPOSE: a) To calculate the range of light absorbing potential (LAP) of hemoglobin and myoglobin in mammalian skeletal muscle at rest based on analysis of published chemical and morphometric data in humans and other mammals (Part 1), and b) use the information in a) to interpret changes in total [Hb+Mb] from NIRS during exercise (Part 2). METHODS: Part 1: Information was retrieved from five published studies with regard to capillary density (#caps/mm2) and [Mb] in skeletal muscle of human, horse and rat. Preference was given to studies in which both measurements were provided for the same muscles. [Hb] in skeletal muscle was estimated as a function of capillary density, [Hb] in systemic blood, and the ratio of capillary-to-systemic hematocrit at rest and during exercise. Part 2: Changes in total [Hb] + [Mb] (as t[Hb+Mb]) from published NIRS data obtained from human subjects performing cycling or knee extension exercise were interpreted in the context of the results of Part 1. RESULTS: Part 1: Individual group mean values for skeletal muscle [Mb] in the literature ranged from 0.25-0.67 mM in human samples, with a similar range for muscles of the rat hindlimb; horse limb muscles tended to be higher (up to 1.0 mM). Capillary densities ranged from ~200 to 600 caps/mm2 in human and rat muscles, and up to 800 caps/mm2 in horse muscle. Assuming a resting capillary hematocrit of 22% and 4 fold greater LAP for each mole [Hb] vs [Mb], the resulting estimation of capillary [Hb] ranged from ~0.03 to 0.09 mM in human and rat muscles, and up to ~0.13 mM in horse muscles. The results suggest that [Mb] could contribute ~50-70% of the total LAP at rest in human skeletal muscle. Part 2: With exercise, total heme by NIRS can increase 9́Æ 30% in individual human subjects. Assuming this increase reflects only increased [Hb], this fits well with the observed increase in capillary hematocrit with exercise. CONCLUSIONS: 1) In skeletal muscle at rest, [Mb] is likely to be at least as significant a light absorbing heme as is [Hb] in most mammalian muscles, including the human leg. 2) Observed increases in t[Hb+Mb] with NIRS during exercise can be explained by an increase in capillary hematocrit, even in the presence of significant [Mb].
From the 39th annual conference of the International Society on Oxygen Transport to Tissue (ISOTT), held in Washington, DC, USA in July 2011, this volume covers aspects of oxygen transport from air to the cells, organs and organisms; instrumentation and methods to sense oxygen and clinical evidence. Oxygen Transport to Tissue XXXIV includes contributions from scientists (physicists, biologists and chemists), engineers, clinicians and mathematicians.
This book covers all aspects of oxygen delivery to tissue, including blood flow and its regulation as well as oxygen metabolism. Special attention will be paid to methods of oxygen measurement in living tissue and application of these technologies to understanding physiological and biochemical basis for pathology related to tissue oxygenation. This book is multidisciplinary and designed to bring together experts and students from a range of research fields including biochemical engineering, physiology, microcirculation, and hematology.
This book provides knowledge of the basic theory, spectral analysis methods, chemometrics, instrumentation, and applications of near-infrared (NIR) spectroscopy—not as a handbook but rather as a sourcebook of NIR spectroscopy. Thus, some emphasis is placed on the description of basic knowledge that is important in learning and using NIR spectroscopy. The book also deals with applications for a variety of research fields that are very useful for a wide range of readers from graduate students to scientists and engineers in both academia and industry. For readers who are novices in NIR spectroscopy, this book provides a good introduction, and for those who already are familiar with the field it affords an excellent means of strengthening their knowledge about NIR spectroscopy and keeping abreast of recent developments.
Nunn's Applied Respiratory Physiology, Ninth Edition, is your concise, one-stop guide to all aspects of respiratory physiology in health, disease, and in the many physiologically challenging situations and environments into which humans take themselves – coverage is from basic science to clinical applications. Trusted for over 50 years, this most comprehensive single volume on respiratory physiology will prove invaluable to those in training or preparing for examinations in anaesthesia, intensive care, respiratory medicine or thoracic surgery – as well as an essential quick reference for physiologists and the range of practitioners requiring ready access to current knowledge in this field. Now fully revised and updated, this ninth edition includes a larger page format for improved clarity, as well as full access to the complete, downloadable eBook version. This incorporates BONUS chapters, handy topic summaries, interactive self-assessment material and a NEW series of expert lectures on key topics. The result is a more flexible, engaging and complete resource than ever before. Enhancements to this edition include: - A new dedicated chapter on obesity – covering the effects of this global challenge on the physiology of the respiratory system in health and disease, in both adults and children - Expanded coverage of the adverse effects of hyperoxia - including the physiology of the now popular technique of high-flow nasal therapy - A revised section on air pollution – reflecting the growing importance and understanding of the impact of pollution on the lungs and other body systems, along with the latest worldwide guidelines - Detailed coverage of artificial ventilation during general anaesthesia – covering post-operative respiratory complications and the physiological basis of current best-practice for optimizing ventilation - Print comes with enhanced eBook - includes access to the complete, fully searchable text, PLUS: - bonus chapters - handy chapter summaries - interactive self-assessment material - a NEW series of 25 expert lectures focusing on the most essential topics in respiratory physiology
Handbook of Modern Biophysics brings current biophysics topics into focus, so that biology, medical, engineering, mathematics, and physical-science students or researchers can learn fun¬damental concepts and the application of new techniques in addressing biomedical challenges. Chapters will develop the conceptual framework of the physics formalism and illustrate the biomedical applica¬tions. With the addition of problem sets, guides to further study, and references, the interested reader can continue to independently explore the ideas presented.Volume 5: Modern Tools of BiophysicsEditor: Thomas Jue, PhDIn Modern Tools of Biophysics, a group of prominent professors have provided insights into the tools used in biophysics with respect to the following topics: Wave Theory of Image Formation in a Microscope: Basic Theory and Experiments Computer Simulations and Nonlinear Dynamics of Cardiac Action Potentials Myoglobin and Hemoglobin Contribution to the NIRS Signal in Muscle Anomalous Low Angle X-Ray Scattering of Membrane with Lanthanides Recording of Ionic Currents under Physiological Conditions—Action Potential-Clamping and “Onion-Peeling” Techniques Patch Clamp Technique and Applications About the EditorThomas Jue is a Professor in the Department of Biochemistry and Molecular Medicine at the University of California, Davis. He is an internationally recognized expert in developing and applying magnetic resonance techniques to study animal as well as human physiology in vivo and has published extensively in the field of magnetic resonance spectroscopy and imaging, near-infrared spectroscopy, bioenergetics, cardiovascular regulation, exercise, and marine biology. He served as a Chair of the Biophysics Graduate Group Program at UC Davis, where he started to develop scholarly approaches to educate graduate students with a balance of physical-science/mathematics formalism and biomedical perspective in order to promote interest at the interface of physical science, engineering, mathematics, biology, and medicine. He continues to develop the biophysics curriculum, and the Handbook of Modern Biophysics represents an aspect of that effort.
This collection of chapters describes in detail the physical therapy research in patients with various types of cancers to help medical professionals and physical therapists help improve the physical function, activity of daily living, quality of life, the survival rate in cancer patients and cancer survivors. It provides not only information on rehabilitation but details on physical therapy cancer research and research methods. The book provides practical skills to treat the patients and to create useful and effective physical therapy programs by giving step-by-step tutorials to help readers learn various techniques. Along with presenting an introduction to physical therapy of cance and new findings, the authors provide recommendations on each cancer therapy. Physical Therapy and Research in Patients with Cancer is aimed at physical therapists and student physical therapists. Undergraduate and postgraduate students also can use our book to understand the basics and get up-to-date information. By sharing the latest research with our readers, the book creates a foundation for further development in this field of study.
This book presents cutting-edge papers and perspectives on the transport of oxygen to tissues by scientists in a multitude of disciplines such as biochemistry, engineering, mathematics, medicine, physics, physiology, veterinary and complementary medicine. The book is composed of the following 6 parts: Brain Oxygenation and Function, Tumor Oxygenation and Metabolism, Muscle Oxygenation and Sports Medicine, Cell Metabolism and Tissue Oxygenation, Methodology of O2 Measurements, and Special Topics. The articles in this book have been presented at the 42nd annual meeting of the International Society on Oxygen Transport to Tissue (ISOTT 2019) held in Albuquerque, New Mexico, USA, from July 28 to July 31, 2019. Academics, clinical and industry researchers, engineers, as well as graduate students who are interested in oxygen transport to tissue will find this book a great reference and a useful learning resource.