I'm curious to see if there is any research or opinions supporting something that I have noticed when comparing the sensations diving on Full inhale (no packing), Passive exhale (FRC), and active/forced exhale.
Assuming I have a RV of 25%;
-Full inhale I blow 6.8L: TLC =(around) 8.5L
-RV : 8.5-6.8= 1.7L
-Passive Exhale (FRC) I blow 2.4: 2.4+1.7=4.1L
-Active Exhale blow <0.1L = <1.8L
To summarize Diving on;
Full inhale = 8.5L
Passive exhake = 4.1L
Active Exhale = <1.8L
Current Limits/PB with equivalent depth on Inhale;
-Full inhale = 60-64m (not limit)
Hopefully all of the math checks out and was presented in a coherent manner.
My question is what exactly causes the decrease in tolerance to pressure with the increased lung volume.
Is it;
Assuming I have a RV of 25%;
-Full inhale I blow 6.8L: TLC =(around) 8.5L
-RV : 8.5-6.8= 1.7L
-Passive Exhale (FRC) I blow 2.4: 2.4+1.7=4.1L
-Active Exhale blow <0.1L = <1.8L
To summarize Diving on;
Full inhale = 8.5L
Passive exhake = 4.1L
Active Exhale = <1.8L
Current Limits/PB with equivalent depth on Inhale;
-Full inhale = 60-64m (not limit)
- limiting factors; Close to hypoxic limit, Squeeze if I make a poor turn, Chest pressure starts around 50-55m.
- Lung volume at depth = 1.21L
- Equivalent depth = 60-64m
- Limiting factors; None.. no chest pressure no squeeze even with big movements during turn.
- Lung volume at depth = 0.82L
- Equivalent depth on Inhale = 10.4 Atmospheres = 94m
- Limiting factors; Equalization.. Small mouthfill after full exhale. No chest pressure, no squeeze, Can extend fully and make hard pulls FIM)
- Lung volume at depth = 0.56L
- Equivalent depth on inhale = 15 Atmospheres = 140m
Hopefully all of the math checks out and was presented in a coherent manner.
My question is what exactly causes the decrease in tolerance to pressure with the increased lung volume.
Is it;
- Tension from the inhale itself
- Tension from the effort of fighting buoyancy
- Delayed Bloodshift (Ie; starts right away on exhale vs. starting at 30+m on inhale)
- Does exhaling relax the mind, similar to a sigh of relief? Allowing us to "let go" on a more subconscious level.