great lecture, really enjoyable and informative. Interesting from a physiological perspective and from that of someone who wants to dive more challenging dives without croaking.
Thank you for your question. Not all individuals have an equal increase in ventilation due to a rise in carbon dioxide. This is one of the reasons why gas density (which is a function of composition and depth) is now considered a more reliable determinant of the depth of a dive and the ability to exercise than relying on sensitivity to carbon dioxide for an increase in breathing.
