Mr T's Wild Freedive

[saxman242]

The whole reason you are more relaxed and using less 02 is because you hyperventilated before taking a breath, if you don't do that, your breath hold will be shorter.

I'd be willing to bet one is more relaxed after hyperventilating because they mentally went through the process of hyperventilating, not because of the biological effects of hyperventilating.

 

[IncreaseMyT]

Hyperventilating suppresses your natural drive to breath, so yes, it increases your chances of blacking out, even though the cause of blacking out is due to lack of oxygen.

It extends the duration of time before you black out, it increases the chance you don’t black out cause it gives your more dive time. You see more people blacking out cause they are pushing their limits, not because of hyperventilating

Blacking out is a symptom of that, because now you are closing in on the boundaries of how much 02 you have.

If you didn’t hyperventilate, your breath hold time would be much shorter, so that would increase your chance of blacking out in the scenario discussed because your used to being able to stay down longer on a single breath.

I’m not arguing with you in why, the point is you have a much shorter dive duration than you normally would

Did I mention we didn't start with a full breath either?

 

[RyanT]

It extends the duration of time before you black out, it increases the chance you don’t black out cause it gives your more dive time. You see more people blacking out cause they are pushing their limits, not because of hyperventilating

Blacking out is a symptom of that, because now you are closing in on the boundaries of how much 02 you have.

If you didn’t hyperventilate, your breath hold time would be much shorter, so that would increase your chance of blacking out in the scenario discussed because your used to being able to stay down long on a breath

This is seriously dangerous misinformation.

 

[IncreaseMyT]

This is seriously dangerous misinformation.

What is dangerous about it? How come you cannot explain, I cited my reference. Where is yours?

 

[saxman242]

It extends the duration of time before you black out, it increases the chance you don’t black out cause it gives your more dive time. You see more people blacking out cause they are pushing their limits, not because of hyperventilating

Blacking out is a symptom of that, because now you are closing in on the boundaries of how much 02 you have.

If you didn’t hyperventilate, your breath hold time would be much shorter, so that would increase your chance of blacking out in the scenario discussed because your used to being able to stay down long on a breath

I’m not arguing with you in why, the point is you have a much shorter dive duration than you normally would

This assumes you ignore your body screaming at you to breathe, which may be common place for a select group but not for most people free diving. For the rest of the world, the body screaming at you to breathe is a strong motivator and suppressing that drive increases risk.

 

[IncreaseMyT]

This assumes you ignore your body screaming at you to breathe, which may be common place for a select group but not for most people free diving. For the rest of the world, the body screaming at you to breathe is a strong motivator and suppressing that drive increases risk.

Thats the whole point of the conversation to begin with. Where have you been? I clearly said numerous times if you take a breath and go straight up you will be fine, as long as you don't hold ur breath.

How long do you think you can hold your breath on a half breath without a proper breathe up? 30 seconds maybe? ON A GOOD DAY

So like I have said hundreds of times, and proven over and over again, when you free dive, then take a breath off a reg, your free dive is over and you just became a scuba diver.

 

[saxman242]

There's a wide chasm between holding your breath for 0 seconds and the territory you need to hyperventilate for. This isn't a binary thing.

 

[IncreaseMyT]

There's a wide chasm between holding your breath for 0 seconds and the territory you need to hyperventilate for. This isn't a binary thing.

I have no idea what you are trying to say here.

 

[IncreaseMyT]

Just more scientific evidence backing up what I said:


"Hyperventilation before diving enables breath hold divers to stay down longer but is very dangerous. The diver starts with a low carbon dioxide content, a high pH, and a normal oxygen tension. During descent to, say, 30 m, the pressure increases fourfold, compressing the airspaces to one quarter their surface volume (from total lung capacity of 6 l to 1.5 l, near residual volume). The partial pressures of oxygen and nitrogen in the alveoli also increase fourfold and produce corresponding increases in arterial and tissue gas tensions. The alveolar carbon dioxide pressure does not change much because there is little carbon dioxide in the lungs at this point and the body has considerable buffering capacity. During the dive oxygen is consumed and carbon dioxide is produced. Because of the hyperventilation the diver does not feel the need to breathe until the arterial oxygen tension has fallen to levels which stimulate the carotid chemoreceptors. As the diver ascends hydrostatic pressure is reduced fourfold with a fourfold reduction in oxygen tensions in alveolar gas, arterial blood, and tissues. The rapidly falling cerebral oxygen pressure may be inadequate for consciousness to be maintained and the diver could drown during ascent.

The danger of hyperventilation applies to all breath hold divers, including snorkel divers and people swimming lengths underwater in pools. The reduction in oxygen pressure when coming to the surface from the bottom of a 2 m deep pool can be enough to cause unconsciousness, and some children have died this way."

ABC of oxygen: Diving and oxygen

 

[saxman242]

Just more scientific evidence backing up what I said:


"Hyperventilation before diving enables breath hold divers to stay down longer but is very dangerous. The diver starts with a low carbon dioxide content, a high pH, and a normal oxygen tension. During descent to, say, 30 m, the pressure increases fourfold, compressing the airspaces to one quarter their surface volume (from total lung capacity of 6 l to 1.5 l, near residual volume). The partial pressures of oxygen and nitrogen in the alveoli also increase fourfold and produce corresponding increases in arterial and tissue gas tensions. The alveolar carbon dioxide pressure does not change much because there is little carbon dioxide in the lungs at this point and the body has considerable buffering capacity. During the dive oxygen is consumed and carbon dioxide is produced. Because of the hyperventilation the diver does not feel the need to breathe until the arterial oxygen tension has fallen to levels which stimulate the carotid chemoreceptors. As the diver ascends hydrostatic pressure is reduced fourfold with a fourfold reduction in oxygen tensions in alveolar gas, arterial blood, and tissues. The rapidly falling cerebral oxygen pressure may be inadequate for consciousness to be maintained and the diver could drown during ascent.

The danger of hyperventilation applies to all breath hold divers, including snorkel divers and people swimming lengths underwater in pools. The reduction in oxygen pressure when coming to the surface from the bottom of a 2 m deep pool can be enough to cause unconsciousness, and some children have died this way."

ABC of oxygen: Diving and oxygen

Weird, that looks to me like it says hyperventilating increases the risk of shallow water blackout.