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Thread: exercise before diving

  1. #1
    Senior Member DiverMike's Avatar
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    exercise before diving

    I am in training for a 1/2 marathon, which is quite a challenge given my bmi of 34 and lack of any history of running. I'm currently on week 7 of a 12 week plan (so 1/2 way there:-) but I've not run this week due to man flu.
    My training plan is calling for longer and longer runs on the weekend but next weekend I am diving. Normally if I am diving I skip a run or make it up in the week. But I'm not going to get a 75min run in this week. I'm seal diving off Lundy on Saturday, max depth 20m, then off to Salcome on Sunday. 35m max no more than 15 mins deco.
    Am I increasing my risk of DCI if I go for a run on the Sunday morning?

    So far the running is proving a great benefit - I find finning much easier.

    Mike
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    There is some evidence to suggest that exercise before diving actually decreases your risk of a bend.

    NOS inhibition increases bubble formation and reduces survival in sedentary but not exercised rats

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    Senior Member Tim Digger's Avatar
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    It's a bit difficult to say. The work that suggests a decrease in DCI with exercise before diving is with animals and 18-24 hours before. There is evidence that exercise within a few (say 4 hours) before diving may increase risk. Almost certainly within 4hrs, possibly longer, after will increase risk.
    Your window is not very large and given your size you may already be at greater risk than those navy men on whom some of the early work was done.
    But far be it for me to discourage exercise and fitness. It gets light at 5.30 get up early and do your run in the week.
    Tim Digger
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    I remember seeing somewhere information suggestiong that a bumpy ride ona rhib reduces the likelyhood of getting a bend. Cant remember where though.

    How to replicate that? Dunno. Jump down a big flight of steps one step at a time?

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    A VS Cash Cow 42's Avatar
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    I wouldn't worry about it too much, train friday night and then again on monday and don't worry about the runs over the weekend. Its a plan so don't worry about altering a few runs around to make some room for a weekend off. You may find giving your legs a rest will offer more benefits down the line as you will allow the muscles to rest and repair themselves.

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    Senior Member DiverMike's Avatar
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    sounds like a good excuse to miss a run. I might finish early one night and try a run before dinner. Cheers for the advice.
    Upcoming: a winter of specials on Top Gun & Ducks ice breaker trip
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    Quote Originally Posted by DiverMike View Post
    Am I increasing my risk of DCI if I go for a run on the Sunday morning?
    Like most things to do with deco the answer is, "it depends".

    In general, pre-dive exercise is considered good, so long as you are not getting sore muscles.

    In general, post-dive exercise is considered bad.


    References for you:
    exercise before diving site:rubicon-foundation.org - Google Search
    exercise after diving site:rubicon-foundation.org - Google Search

    cheers,
    Paul

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    All we wanted was a home... Manics Blu DL's Avatar
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    hi Mike.
    Personally I would say (with no medical qualification whatsoever) that it's about risk and likelihood. No-one with sense will tell you do this and you won't get a bend as we all know that people get bends for no good reason.

    I would:
    1/. Light exercise a good 6hrs before a dive - nothing too heavy.
    2/. Think about rehydration and the effect of the exercise.
    3/. No exercise for a good 16hrs after a dive

    The problem with the above is it isn't a guarantee. How about going on the loop at 100% after the run - or take a 3 litre pony on the run with you.... now that WILL kill you!!
    Regards, ***All written without prejudice

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    aka Chimp 1 or Mavis... GLOC's Avatar
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    You can get access to the complete files from ingentaconnect Home and create a free account.

    However, as Tim Digger points out, some of these experiments were done in rats, rather than humans. The venous bubble count experiment was done on military divers.

    Regards
    Gareth
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