Deep-sea breath divers- physiological response
In highschool I ran cross country. And during exercises I was left to ponder simple things, like breathing. In my experience, a trained ability to focus on breathing patterns aids in exercising efficiency. Well, today in class I was thinking about deep sea divers and whales and mammals that can stay underwater for long periods of time. The first connection is to Japanease and Korean Pearl divers who regularly descend 20-30 meters to collect pearls.
In researching I found that a component of this physiological training, occurs in (probably) all mammals, certainly in humans, whether trained or not. Apparently, submerging the face in cold water and holding your breath (self-induced apnea) causes body tissue to more redily convert to anaerobic respiration, thereby drawing less from the oxygen reserve in the lungs, and allowing a longer breath. The key factor here is the cold-water induced anaerobics which is not a need based cellular cycle (regular anaerobics are induced in response to higher O2 demand).
http://jap.physiology.org/cgi/content/full/93/3/882 From the Journal of Applied Physiology
What i was really looking for was information on the Diving reflex, something which reduces bloodflow to nonessential organs for a short period of time. the stomach, spleen, and liver are nearly entirely shut down to reduce the heart's required output. only the essential organs are supplied, thereby reducing the heart rate as well (bradycardia or brachacardia). This permits the mammallian body to survive effectively on only one breath for a longer period of time. With training, deep sea divers can enter bradycardia almost at will.
"In 2002, free-diving champion Mandy-Rae Cruikshank set a women’s world record for static apnea of 6 minutes 13 seconds (the men’s record, set in 2001 by Scott Campbell, is 6 minutes 45 seconds)." http://advan.physiology.org/cgi/content/full/27/3/130SIMULATED HUMAN DIVING AND HEART RATE: MAKING THE MOST OF THE DIVING RESPONSE AS A LABORATORY EXERCISE Sara M. Hiebert1 and Elliot Burch2
As an aside, mental arithmetic speeds up the transfer into submerged bradycardia. Prose, however, has no affect.
"Attenuation of the diving reflex in man by mental stimulation." Ross A, Steptoe A.
In researching I found that a component of this physiological training, occurs in (probably) all mammals, certainly in humans, whether trained or not. Apparently, submerging the face in cold water and holding your breath (self-induced apnea) causes body tissue to more redily convert to anaerobic respiration, thereby drawing less from the oxygen reserve in the lungs, and allowing a longer breath. The key factor here is the cold-water induced anaerobics which is not a need based cellular cycle (regular anaerobics are induced in response to higher O2 demand).
http://jap.physiology.org/cgi/content/full/93/3/882 From the Journal of Applied Physiology
What i was really looking for was information on the Diving reflex, something which reduces bloodflow to nonessential organs for a short period of time. the stomach, spleen, and liver are nearly entirely shut down to reduce the heart's required output. only the essential organs are supplied, thereby reducing the heart rate as well (bradycardia or brachacardia). This permits the mammallian body to survive effectively on only one breath for a longer period of time. With training, deep sea divers can enter bradycardia almost at will.
"In 2002, free-diving champion Mandy-Rae Cruikshank set a women’s world record for static apnea of 6 minutes 13 seconds (the men’s record, set in 2001 by Scott Campbell, is 6 minutes 45 seconds)." http://advan.physiology.org/cgi/content/full/27/3/130SIMULATED HUMAN DIVING AND HEART RATE: MAKING THE MOST OF THE DIVING RESPONSE AS A LABORATORY EXERCISE Sara M. Hiebert1 and Elliot Burch2
As an aside, mental arithmetic speeds up the transfer into submerged bradycardia. Prose, however, has no affect.
"Attenuation of the diving reflex in man by mental stimulation." Ross A, Steptoe A.
posted by Anonymous at 10:34 AM
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