Diving and Asphyxia

Diving and Asphyxia

A harbor seal (Phoca vitulina) exhales and submerges. As water contacts its nostrils, there is a rapid increase in firing of the cardiac vagus nerve and the heart rate drops from 100 to 10 beats per minute. Simultaneously, an alpha-adrenergic peripheral vasoconstriction results in a central shift in oxygen-rich blood volume. The inferior vena cava enlarges to the size of a football. Though card...

Diving and asphyxia. A comparative study of animals and man.

Make more knowledge even in less time every day. You may not always spend your time and money to go abroad and get the experience and knowledge by yourself. Reading is a good alternative to do in getting this desirable knowledge and experience. You may gain many things from experiencing directly, but of course it will spend much money. So here, by reading diving and asphyxia a comparative study...

Circadian rhythms in diving behavior and ventilatory response to asphyxia in canvasback ducks.

Underwater feeding behavior was measured in 10 captive canvasback ducks ( Aythya valisineria) for 12 days under a 12:12-h light-dark photoperiod. Feeding activity exhibited a daily rhythm, with 76% of dives occurring at night. In separate experiments on six of these ducks, a circadian rhythm was observed in the duration of voluntary dives. Dives at night (14.7 ± 0.7 s) were significantly longer...

diabetes and diving

a 35 year old diver comes to your office. he had hyperglycemia in his last check up. he asks if he can steel dive in spite of hyperglycemia. we reviewed the recent studies about diabetic persons who dive. recent studies have shown that well controlled diabetic persons may be permitted to dive, but if they have any problem such as diabetic nephropathy, retinopathy, neurological and cardiac probl...

Birth asphyxia.