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SWB Shallow Water Blackout

SWB Shallow Water Blackout. By Michelle Brislen. What is SWB?. Loss of Consciousness while in water Usually caused by hyperventilation while freediving or breath-holding Often happens to freedivers, athletes, and good swimmers. Can happen in the ocean, pools, lakes, rivers, etc.

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SWB Shallow Water Blackout

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  1. SWBShallow Water Blackout By Michelle Brislen

  2. What is SWB? • Loss of Consciousness while in water • Usually caused by hyperventilation while freediving or breath-holding • Often happens to freedivers, athletes, and good swimmers. • Can happen in the ocean, pools, lakes, rivers, etc.

  3. “Hero Worship” Image from NY Times

  4. Energy Processes Cellular Respiration C6H12O6 + 6O2 6CO2 + 6H2O + Energy Sugar Oxygen Water Carbon Dioxide

  5. How does it happen? • Release of CO2 (Carbon Dioxide) through hyperventilation or deep exhales • When under water O2 (Oxygen) is used up and turned in to CO2 • CO2 is lower than normal because of hyperventilation thus decrease urge to breathe • Stay down/under water longer and O2 continues to be used and deprives brain • Blackout occurs

  6. Normal Dive SWB Dive Problem Diagrams from Wikipedia

  7. Shallow Water Blackout Diagram from Aquatics International

  8. How to Prevent SWB • Do not hyperventilate • Do not have breath-hold competitions under water • Do not perform underwater laps • When you feel the urge to breathe, begin your ascent “Leave something in the tank!” • Dive with a Buddy!!!! Maintain watch for 30 seconds after surfacing • Be weighted correctly and willing to release your belt if you’ve pushed it too far. • Tell your friends! Adults too!

  9. References • shallowwaterblackoutprevention.org • “Confessions of a Freediving Spearo” by Sheri Daye; Hawaii Skin Diver Magazine 2010 • www.aquaticsafetygroup.com/PDF/DyingforAirAquaticsInternationalFebruary2005.PDF • www.aquaticsafetygroup.com/PDF/ShallowWaterDeathTheCombatEdge2003.pdf • www.wikipedia.com

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