SCUBA PHYSIOLOGICAL
Think You Know All About Diving Medicine? Think Again!





This book makes it easy to understand the latest discoveries in diving research and our current understanding of what happens to our bodies when we dive.”

JP Imbert: Decompression designer and technical diving pioneer





If you are a diver, what you learned about topics such as decompression sickness and narcosis in your scuba diving classes is unlikely to have been as complete as you thought. Most of it will have been over-simplified and some of it will just have been plain wrong, as diver training agency texts have not kept pace with the science.


There have been great advances to make diving safer, but, despite nearly 170 years of research, the fundamental nature of decompression sickness and decompression stress remains unknown and there are still glaring gaps in our knowledge. Scuba Physiological provides us with a good summary of what we know, a glimpse of where current science is taking us and some good tips to make us all safer divers now. For instance:

1. Pre-dive hydration, exposure to heat, whole body vibration and oxygen breathing may reduce your risk of DCS.

2. Post-dive, our bodies have most bubbles running around them 30 to 40 minutes AFTER we have surfaced.

3. The effects of nitrogen narcosis continue for a period of time AFTER a dive.


4. All dive computers have a known DCS risk rate.

5. Exercise during the period up to 120 minutes after surfacing may increase your risk of DCS.

6. Never use a weightlifter’s breath-hold and release technique when pulling yourself into the boat post-dive.

7. A little dark chocolate before a dive may be a good thing for you.

Recently, a book was published called The Science of Diving, which collated summaries of work done by scientists in the field of decompression research as part of a three-year project called PHYPODE (Physiology of Decompression). The book did not reach the diving public mainly because it was written by scientists for other scientists and they speak a different language than most of us.


Simon Pridmore is not an expert on diving medicine but he knows something good when he sees it. When Simon read The Science of Diving (with help from Google), he thought it was worthwhile working on it to try to make it more accessible. The original authors thought it was a good idea and Scuba Physiological is the result.

Peer Reviews

”There are some lovely thought-provoking ideas and questioning of current dogma. This book is well worth the read. Who will get the most out of this book? Certainly clued-up enthusiast divers who really want to progress their knowledge, but I suspect that the main audience would be those coming into the field of hyperbaric medicine. Some of the early chapters on decompression models and the blood vessels got my brain working hard, yet others on commercial and recreational diving required no effort.”
Dr Ian Sibley-Calder, HSE Approved Medical Examiner of Divers, Occupational Health Physician

”If you ask a lay person what causes DCS they will likely tell you, "I don't know, I think it has something to do with bubbles”. If you ask a dive instructor they might discuss things like shaking a soda bottle. And, if you ask a physician, you may get an account referring to things like leukocyte adhesion, the coagulation of components inside a vein and the endothelium lining. Finally, you find one of the top people in the world who do hyperbaric research on divers, ask them the same question and they will say, "I don't know, I think it has something to do with bubbles. The bottom line is that we don't necessarily know what causes DCS. Scuba Physiological is an excellent discussion of what the third person you asked in the above scenario might say. It is an enjoyable, simplified read of a complex subject and easy for a non-scientist to comprehend. I consider this an essential text for every diver's shelf.”
Joseph Dituri PhD (c), CDR, US Navy Saturation Diving