City Sailingvideo
The Shocking Truth About Cold Water Immersion
19 April 2023 · 3 min · 997 views
What this video covers
Cold water immersion causes approximately 60% of cold-water fatalities through immediate physiological responses rather than long-term hypothermia.0:19 The most dangerous reaction is the cold shock response, which triggers an involuntary gasp of two to three litres of air upon initial contact.1:19 Because the lethal threshold for drowning is approximately 1.5 litres of inhaled water, this single gasp can prove fatal if the airway is submerged or exposed to breaking waves.1:46 Subsequent uncontrollable hyperventilation further increases drowning risk, while sudden spikes in blood pressure and heart rate can induce cardiac arrhythmias or heart attacks.2:07 To mitigate these hazards, boaters should prioritise staying clipped on to prevent falls and wear protective clothing that slows water entry.0:52 If immersion occurs, the primary survival strategy is to remain still and float until breathing stabilises.1:07 Habituation through repeated short exposures to cold water can reduce the severity of the initial shock response.2:54
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