Diving Seals and Meditating Yogis

Strategic Metabolic Retreats

Author: Robert Elsner

Publisher: University of Chicago Press

ISBN: 022624704X

Category: Science

Page: 192

View: 1883

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The comparative physiology of seemingly disparate organisms often serves as a surprising pathway to biological enlightenment. How appropriate, then, that Robert Elsner sheds new light on the remarkable physiology of diving seals through comparison with members of our own species on quests toward enlightenment: meditating yogis. As Elsner reveals, survival in extreme conditions such as those faced by seals is often not about running for cover or coming up for air, but rather about working within the confines of an environment and suppressing normal bodily function. Animals in this withdrawn state display reduced resting metabolic rates and are temporarily less dependent upon customary levels of oxygen. For diving seals—creatures especially well-adapted to prolonged submergence in the ocean’s cold depths—such periods of rest lengthen dive endurance. But while human divers share modest, brief adjustments of suppressed metabolism with diving seals, it is the practiced response achieved during deep meditation that is characterized by metabolic rates well below normal levels, sometimes even approaching those of non-exercising diving seals. And the comparison does not end here: hibernating animals, infants during birth, near-drowning victims, and clams at low tide all also display similarly reduced metabolisms. By investigating these states—and the regulatory functions that help maintain them—across a range of species, Elsner offers suggestive insight into the linked biology of survival and well-being.
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Marine Mammal Physiology

Requisites for Ocean Living

Author: Michael A. Castellini,Jo-Ann Mellish

Publisher: CRC Press

ISBN: 1482242699

Category: Medical

Page: 356

View: 4632

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Suppose you were designing a marine mammal. What would you need to think about to allow it to live in the ocean? How would you keep it warm? What would you design to allow it to dive for very long periods to extreme depths? Where would it find water to drink? How would you minimize the cost of swimming, and how would it find its prey in the deep and dark? These questions and more are examined in detail throughout this book. Marine Mammal Physiology: Requisites for Ocean Living is the first textbook focused on how marine mammals live in the sea from a physiological point of view. It explores the essential aspects of what makes a marine mammal different from terrestrial mammals, beyond just their environment. Unlike many publications and books that cover these species from almost all perspectives, this textbook takes a step back to focus on the physiological and biochemical characteristics that have allowed these mammals as a group to exploit effectively the marine environment that is so hostile to humans. The chapter topics are grouped into major themes: diving and locomotion, nutrition and energetics, reproduction, sensory systems, and environmental interactions. Each chapter is arranged around a common perspective and theme: the big picture challenge and summary and what is known specifically by order. To aid you even further, the authors include a "Toolbox" section in each chapter where they discuss the newest methods for understanding and working on the physiology of marine mammals.
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Alaska science nuggets

Author: T. Neil Davis

Publisher: University of Alaska Press

ISBN: N.A

Category: Science

Page: 233

View: 3241

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Answers to fascinating scientific questions about Alaska and the North can be found in this collection of more than 400 short articles. Neil Davis is a senior geophysical scientist well known for his clarity, skill, and wit in communicating scientific concepts to the general public.
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Surviving the Extremes

A Doctor's Journey to the Limits of Human Endurance

Author: Kenneth Kamler

Publisher: St. Martin's Press

ISBN: 9781429976114

Category: Sports & Recreation

Page: 320

View: 3377

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Physiological constraints confine our bodies to less than one-fifth of the earth's surface. Beyond that fraction lie the extremes. What happens when we go to them? Dr. Kenneth Kamler has spent years observing exactly what happens. A vice president of the legendary Explorers Club, he has climbed, dived, sledded, floated, and trekked through some of the most treacherous and remote regions in the world. A consultant for NASA, Yale University, and the National Geographic Society, he has explored undersea caves, crossed the frozen Antarctic wastelands, and stitched a boy's hand back together while kneeling in knee-deep Amazonian mud. He was the only doctor on Everest during the tragic expedition documented in Jon Krakauer's Into Thin Air and helped treat its survivors. Kamler has devoted his life to investigating how our bodies respond to "environmental insults"-a nice way of saying the things that can kill us-and watched while some succumbed to them and others, sometimes miraculously, overcome them. Words like "extreme" and "survival" have lost some of their value from overuse and media hype. By showing us what happens when life itself is at stake, and the body's capacities put to their greatest test, this book reminds us what they truly mean. Divided into six sections-jungle, open sea, desert, underwater, high altitude, and outer space-Surviving the Extremes uses first-hand testimony and documented accounts to illustrate what happens in environments where our instinctive survival strategies must become fully engaged. These stories reveal how infinitely complex are the workings of the human body-and also how heartbreakingly fragile. At the heart of this book is a quest for the source of our will to survive and the haunting question of why some can, and others cannot, summon its awesome and nearly mystical power at their moment of greatest need. Surgeon, explorer, and masterful storyteller, Kamler takes us to the farthest reaches of the earth as well as into the uncharted territory within the human brain. Surviving the Extremes is a scientific nail-biter no reader will forget.
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Undercurrent

The Private, Exclusive Guide for Serious Divers

Author: N.A

Publisher: N.A

ISBN: N.A

Category: Deep diving

Page: N.A

View: 1437

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The Bellstone

The Greek Sponge Divers of the Aegean : One American's Journey Home

Author: Michael N. Kalafatas

Publisher: Brandeis Univ

ISBN: N.A

Category: History

Page: 287

View: 7854

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Inspired by his grandfatherÆs poem "Winter Dream" about sponge diving, an American chronicles his return to Greece in search of this ancient practice and his own past. (Travel)
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E-Book Teaching Pilates for Postural Faults, Illness and Injury

a practical guide

Author: Jane Paterson

Publisher: Elsevier Health Sciences

ISBN: 0702033057

Category: Medical

Page: 284

View: 9954

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Pilates is a particularly safe and effective exercise system which aims to strengthen the body in a balanced way by specifically improving the function of the weaker muscle groups. Emphasis is placed on strengthening the muscles of the trunk so that support of the spine increases plus posture and shape improve. The exercises enhance overall flexibility and fitness, improving co-ordination and balance. Muscles are gently stretched and lengthened as the exercises progress and overall body strength improves. describes the underlying principles of the exercises in physical terms describes the treatment of common medical conditions provides a manual for those in the remedial health care professions
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