[perow1]

I have no exact numbers, but I would say it works that way. Even the slightest work will make the contractions come a lot earlier. It is a smart thing focusing on relaxation, but do not let the contractions bother you. The contractions WILL be a part of your dive if you want to go far. The best thing you can do is focusing on relaxation WITH the contractions. Contractions at 40secs isn´t that odd I would say and early contractions might even be helpful and oxygen conserving in the long run. I am sure that, with practice, you will be able to relax and continue with your contractions. It is also a mentally important thing to get your mind OFF the contractions, since these are the ugly part of diving. Let the total dive result be the judge on if the dive was successful, not when the contractions hit you.