What Researchers Did
Researchers studied the lung function of six divers living in a hyperbaric chamber at a pressure of 49.5 ATA, which is nearly fifty times normal atmospheric pressure.
What They Found
They found that at 49.5 ATA, the divers' maximum voluntary ventilation was 45% lower than normal. During underwater work, divers quickly became exhausted at moderate oxygen consumption (1.9 liters/min), experiencing severe shortness of breath and near-fainting. These symptoms were not caused by carbon dioxide buildup or other circulatory or metabolic issues.
What This Means for Canadian Patients
This study highlights the significant breathing challenges faced by divers operating at extreme depths, where gas density severely impacts lung function. It indicates that even healthy individuals have a limited physiological reserve in such high-pressure environments, increasing risks during emergencies or illness. This information is crucial for understanding the safety limits and physiological demands on professional divers.
Canadian Relevance
This study covers aspects related to diving physiology, which is relevant to Health Canada-recognized indications such as decompression sickness and arterial gas embolism.
Study Limitations
A limitation of this study is its small sample size, involving only six male divers.