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Just so happens this is the feature story of the new issue of "Dive
Training" magazine.  FWIT.  

Regards,

Quinn


Stuart Morrison wrote:
> driving back from some dive sites over here (Scotland) means 
> driving   
> through some mountain passes -- winter can be fun!!!
> 
> Anyway, I'm not talking major altitude changes, well within 
> the ascent   
> after diving limits. Despite the heights not being great, the 
> change in   
> altitude can be very rapid, enough to feel it in your ears.
> 
> So my question is, is the speed of altitude change important 
> even if the   
> altitude itself is "safe"? If I can feel a rapid pressure 
> change in my   
> ears, is it doing anything to my tissues?
> 
> I've never seen the rate of change mentioned anywhere but I'd 
> imagine it   
> must play some part.
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