Exercise not only creates bubbles, but it also results in several other important risks of diving for divers.
Swimming has to be the most practical skill for any diver to have. Face it. We are just as much at the mercy of the water while we're on the surface as when we are at depth. Boats capsize, people fall overboard, and divers need rescuing at the surface. Without the ability to comfortably swim for extended periods, we would be taking unnecessary risks every time we head out for a dive.
There is a common belief that while children diving they should not exceed 9 metres depth until their bones have reached osteogenic maturity, i.e. when the epiphyses have fused.
The diving age range varies from 17 to 20 years at one extreme, to 35 at the other. In adulthood, age is of limited value in success prediction for achieving diving skills, but the most satisfactory age is in the early twenties.
Although some authors quote the large US asthma death statistics, based originally on University of Rhode Island studies, the compilation of these data in fact allowed hardly any conclusions regarding such contributing factors as asthma.
Great difficulty is experienced in scuba divers asthma treatment when they are rescued and survive until recompression. They may suffer a difficult clinical complex comprising deep unconsciousness from near-drowning and probable cerebral gas embolism, respiratory impairment from near-drowning and asthma.
The professional or commercial diving encompasses a broad range of divers including the military diver, the offshore oilfield saturation diver, the recreational diving instructor, the photojournalist, the scientific diver and the police diver.Whilst their scope of diving varies markedly, what they do have in common is that they are employed and receive financial gain from their diving.
To certify that a person is fit to be taught diving ideally implies that he is physically fit, medically healthy and psychologically stable. Humans are clearly not adapted naturally to dive; if they were they would possess gills. Yet recreational scuba diving is one of the fastest growing leisure sports, and medical standards are required by their patients to be capable of furnishing an opinion as to their medical fitness to dive.