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I think bradycardia does help, but I don't know how much. One think many people forget is that heart rate is not the most important thing. The important thing is what bradycardia helps in accomplishing, a low blood flow.
It's no use in having a low heart-rate, where the heart is pumping a bigger volume of blood per beat.
I've seen some HR graphs, and have seen a few where people doing 7' start with a HR of around 80 for the first 3 minutes. Then their HR start to gradually drop down to a low just under 40. My HR follows a more bucket like profile.
So do no reason to worry if you have a higher HR then a well trained apneist, perhaps yours is more like a light engine needing to make more revolutions to displace the same volume of blood.
That low HR thing is a very common misunderstood aspect, so good you mention it.I think bradycardia does help, but I don't know how much. One think many people forget is that heart rate is not the most important thing. The important thing is what bradycardia helps in accomplishing, a low blood flow.
It's no use in having a low heart-rate, where the heart is pumping a bigger volume of blood per beat.
I've seen some HR graphs, and have seen a few where people doing 7' start with a HR of around 80 for the first 3 minutes. Then their HR start to gradually drop down to a low just under 40. My HR follows a more bucket like profile.
So do no reason to worry if you have a higher HR then a well trained apneist, perhaps yours is more like a light engine needing to make more revolutions to displace the same volume of blood.
I would say a Strong DR most beneficial in dynamics.
A tiny bit less beneficial in human powered depth disciplines, because water pressure also helps to reduce blood flow to the limbs! (CWT, FIM, CNF, VWT)
And again a bit less in Static.
But a good DR is very beneficial to ALL freediving in general.