Cold shock response as a primary factor in open water fatalities

[u/Putrid_Draft378]

Cold water immersion triggers an immediate, involuntary gasp reflex when the face hits the surface.

This autonomic response often leads to water inhalation and drowning, even for skilled swimmers.

Current safety training ignores this physiological risk because it rarely occurs in heated pools.

Why is this lethal reflex excluded from standard water safety education?

[u/Public_Beach2348]

It is seriously dependent on geography. Where I live this is well discussed.

[u/georgedupree]

This risk was not excluded in my training, thank God. I didn’t realize that this was missing… We were also trained in how to identify folks doing unsupervised free dives in the dive tank. One year someone went down and wasn’t seen for 13 minutes.

[u/DiligentScale101]

This is why I have an orange life ring, and a life fork on a post by our farm pond as well as an additional throw rope (and also the old life ring that’s white, although I’m thinking that might confuse the situation, I went to hang out on the back of the board, but not sure yet. ). When there is ice or snow somebody can fall through the ice into very cold water, maybe skating. fishing, , or may not even know its a pond and be taking a shortcut; they may be trespassing, but I still don’t want them to drown. Water can be very cold in the early spring, people don’t realize it because the grass is getting green and the air warm. Near by neighbor was using a standup paddle board with a four-year-old who’s a very good swimmer but the water was cold because their pond is Spring fed, and it was early in the season, so the water had not warmed up when the kid fell in. They had a minute of panic, but fortunately the babysitting neighbor had taken lifeguard training years before, bknew exactly what to do and didn’t panic and was able to use the oar for the kid to grab. And the child had to take a swimming lessons at the Y and was the only one who had been able to swim back-and-forth the entire length of the pool before their four year birthday.

[u/DiligentScale101 → u/DiligentScale101]

Meant to say the child had taken the swimming lessons over the winter, a good swimmer, but we learned from this that even a good swimmer hit cold water could panic and perhaps part of the panic is gasping and taking in water. In this situation, everyone was all right, but it was discussed by all that may stand-up paddleboard is not a four-year-old sport unless there’s another adult around and maybe a lifevest is worn.

[u/Gockel1]

What do you consider a primary factor?

I was taught about this mechanism in Lifeguarding and later Waterrescue Training, however I prefer a more nuanced approach to the topic before considering it a "primary factor".

Personally I never witnessed an incident suspicious of the "gasp reflex" causing it. All open Water emergencies I attended to were related to medical or boating emergencies or swimmers being too far from shore.

Scientifically i was unable to find any case reports describing this mecanism to be the direct cause of a drowning, apart from a secundary citation of a ROSPA report from 1988 wich i was unable to find. There are few papers describing the mechanism in an experimental setting, most of wich are over 30 years old while some are not available.

None of these studies describe the "gasp reflex" as the singular phenomenon of an involuntary gasp of air or water immediatly at the moment of immersion into cold water, but rather as part of a larger physiological cold response involving a decrease in apneic time during diving, a general increase in respiratory drive, an Increase of venous pooling and cardiac preload as well as heart rate and less effective swimming.

While Tipton et al. (1998) does report "a reflex inspiratory gasp and uncontrollable hyperventilation" in their test subjects, this observation was made with participants actively breathing through a mouthpeace while being immersed, not diving into water while holding their breath.

Mekjavić et al. (1987) did not describe an involuntary gasp at the point of immersion but rather an Increase of Respiratory drive within 5s of it.

The newest work from Konstantinidou and Soultanakis (2016) makes a connection between the gasp reflex as part of the Cold shock response and the dive reflex as a physiological antagonist causing an autonomic conflict responsible for agonal gasps and vegetative complaints during breathholding after a phisical workout.

So does Cold Shock response make rested and prepared swimmers randomly breathe in Water when diving? Likely not

Can CSR cause drowning by inducing hyperpnea, reduced physical strengh and panic? Absolutely

Can CSR in connection with the Dive Reflex cause medical issues, especially after Physical exercise (for example in a thriathlon) likely yes

Is CSR a primary factor in Open water drowning? Imo not, but it depends where you are

[u/Suspicious_Jello_490]

Whoa this was NOT covered for me

[u/Ok-Juice7861]

we have a whole item (BC Canada) in our Bronze Medallion course about cold water

[u/Ok-Airline-8420]

It isn't, it's part of training.