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Thread: CCR vs OC for asthmatics

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    CCR vs OC for asthmatics

    I was asked a question at work that had me stumped - for asthmatics which is more likely to trigger an asthma attack while diving - cold dry air from OC or warm moist air from a CCR?

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    Re: CCR vs OC for asthmatics

    Quote Originally Posted by RedSeaDiver  View Original Post
    I was asked a question at work that had me stumped - for asthmatics which is more likely to trigger an asthma attack while diving - cold dry air from OC or warm moist air from a CCR?
    I would think dry air. But, most asthma attacks are in Summer. Hot moist air. Laden with particles that cause the attack.

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    Re: CCR vs OC for asthmatics

    Quote Originally Posted by mverick  View Original Post
    I would think dry air. But, most asthma attacks are in Summer. Hot moist air. Laden with particles that cause the attack.
    Although I supose another arguement could be that on CCR it is our lungs that drive the gas round the loop hence increased wob were as on OC once you have "cracked" the reg it throws gas at you ?

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    Re: CCR vs OC for asthmatics

    There are two types of triggers for Asthma.
    Allergens and exercise.

    From what I am aware exercise induced asthmatics are not encouraged to dive.

    With OC you are breathing a filtered gas so allergens should have little effect.

    While with CCR you are recirculating the gas that travels through the scrubber that contains dust that could trigger an attack. Also WOB is higher so more likely to be induced through exercise.
    Last edited by Packhorse; 30th May 2010 at 07:39.

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    Re: CCR vs OC for asthmatics

    Quote Originally Posted by RedSeaDiver  View Original Post
    I was asked a question at work that had me stumped - for asthmatics which is more likely to trigger an asthma attack while diving - cold dry air from OC or warm moist air from a CCR?
    In theory warm moist air is better but in practise if you really have asthma you're better off picking another sport.

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