MURDAUGH, H. VICTOR, JR., EUGENE D. ROBIN, J. EUGENE MILLEN, WILLIAM F. DREWRY, AND EDGAR WEISS. Adaptations to diving in the harbor seal: cardiac output during diving. Am. J. Physiol. 2 I o( I) : I 76-180. I g66.-Measurements of cardiac output, heart rate, stroke volume, aortic, pulmonary artery, and ventricular blood pressures, and flipper blood flow were performed in the harbor seal before, ...

Approximately four decades ago, scientists were fi rst able to enter the undersea polar environment to make biological observations for a nominal period of time. The conduct of underwater research in extreme environments requires special consideration of diving physiology, equipment design, diver training, and operational procedures, all of which enable this under-ice approach. Since those fi r...

The purpose of the present field study was to explore diving patterns and heart rate of elderly Korean women divers (haenyeo) while breath-hold diving in cold seawater. We hypothesized that the decreasing rate in heart rate of elderly haenyeos during breath-hold diving was greater and total diving time was shorter than those of young haenyeos from previous studies. Nine haenyeos participated in...

The emperor penguin (Aptenodytes forsteri) thrives in the Antarctic underwater environment, diving to depths greater than 500 m and for durations longer than 23 min. To examine mechanisms underlying the exceptional diving ability of this species and further describe blood oxygen (O2) transport and depletion while diving, we characterized the O2-hemoglobin (Hb) dissociation curve of the emperor ...

BACKGROUND Many occupational diving groups have substantially different diving patterns to those for which decompression schedules are validated. AIMS To evaluate tuna farm occupational diving practice against existing decompression models and describe a method for collecting and modelling self reported field decompression data. METHODS Machine readable objective depth/time profiles were ob...

Exercising before, during, or after diving is proscribed because of the assumption that it would increase incidence of decompression sickness. Our findings show that exercise performed in a timely fashion before diving or during decompression will reduce the number of venous gas bubbles formed. Exercise after diving did not increase the number of bubbles. Nitric oxide seems to play a protective...

In recent years, scuba diving has become accessible worldwide. The average age of female scuba divers is similar to their window of fertility, and many women dive annually without knowing their pregnancy status. These women seek advice concerning the potential teratogenicity of diving, and whether they can continue the pregnancy. Nevertheless, little is known about the consequences of scuba div...

Pioneering studies by Per Scholander indicated that the diving response consists of reflexly induced apnea, bradycardia and an alteration of blood flow that maintains perfusion of the heart and brain. More recently field physiological studies have shown that many marine animals can adjust cardiorespiratory aspects of their diving response depending upon the behavioral situation. This could sugg...

Exploring factors that influence diving behavior is critical to understanding energy budgets, habitat use, and exploitation rates of prey. Optimal diving behavior studies have focused primarily on trade-offs between oxygen recovery at the surface and energy intake at depth. General predictions from these models are often supported by empirical data, but a mismatch exists between theory and data...

engaging in breath-hold diving, a sharp increase in diving injuries has been seen in EDs (Box 133.2). Deaths from breath-hold diving alone have almost doubled in the last 5 years, thus illustrating the potential for injury associated with this form of diving. With acute DCI, rapid assessment and treatment are the foundation of management. Three keys to successful ED treatment are having a high ...