Why does heart rate fall when you jump in cold water?

I thought your heart rate would increase when you jump in cold water because of adrenaline release, but I've been told it decreases. Why is this? Thanks!

Authored By Katy Kershaw on Sunday 20th January 2013

Responses

Debkumar Chowdhury
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Clinical Fellow Surgery - West of Scotland
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Posted over 7 years ago

Adrenaline response is present at times of stress as the 'fight and flight' response. However when one immerses one's head in cold water, the vagus nerve gets activated. We know the vagus nerve is involved in parasympathetic activity to the

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Reza Ghiassi
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Posted over 7 years ago

As thermoregulation system in body acts mainly through heat exchange between peripheral circulation and surrounding environment, heart rate decreases to reduce heat loss to periphery and maintain core body temperature. Furthermore, heat production is

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Dr Kannuvellil E Rajan
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Posted over 7 years ago

Further to the points highlighted by Debkumar Chowdhury, some more facts. Immediate response to bodily immersion in cold or hot water is an initial tachycardia, may be associated with tachypnea. Subsequently, cold water decelerates all metabolic proce

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R Hutch
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Posted over 7 years ago

Cold water, leads to a vagal response at the AV node. this slows cardiac conduction. This is why in Superior Ventric. Tachy. patients may experience relief by drinking ice cold water, splashing water on their face or sucking an ice cube.

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Tasleema Begum
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Medical Student - Manchester
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Posted over 7 years ago

I thought it was to do with the vagal response. This is why people with SVTs can be treated by submersion in cold water sometimes,

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Surender singh
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Posted over 7 years ago

After initial rush , I believe the body will preserve heat dec peripheral circulation , leading to dec workload ,dec hrt rate .

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ajaz ahmed
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Posted over 7 years ago

its because of vagus stimulation...

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