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cold water & ice swimming (IISA)

20% of People Have a Genetic Mutation That Provides Superior Resilience to Cold

Almost one in five people lack the protein α-aktinin-3 in their muscle fiber. Researchers at Karolinska Institutet in Sweden now show that more of the skeletal muscle of these individuals comprises slow-twitch muscle fibers, which are more durable and energy-efficient and provide better tolerance to low temperatures than fast-twitch muscle fibers. The results are published in the scientific journal The American Journal of Human Genetics.

Skeletal muscle comprises fast-twitch (white) fibers that fatigue quickly and slow-twitch (red) fibers that are more resistant to fatigue. The protein α-aktinin-3, which is found only in fast-twitch fibers, is absent in almost 20 percent of people – almost 1.5 billion individuals – due to a mutation in the gene that codes for it. In evolutionary terms, the presence of the mutated gene increased when humans migrated from Africa to the colder climates of central and northern Europe.

Can Cold Water Cure Dementia?

New research suggests swimming in cold water could provide big brain benefits

If you took part in a polar plunge to clear the cobwebs and ring in the New Year feeling refreshed and ready, you might want to consider adding some more chilly splashes the rest of the year. It might not all be in your head—or maybe that brand-new feeling is in the very cells of your brain itself.

It seems there could be a connection between swimming in cold water and a healthier brain, according to new research led by Giovanna Mallucci, a professor of clinical neurosciences and associate director of the UK Dementia Research Institute at the University of Cambridge. Her team has recently produced some compelling evidence that cold water swimming could slow age-related cognitive decline and maybe even hold the key to a future cure for dementia.

After-drop is real – and how to deal with it

If you have spent any time hanging around open water swimmers you may have heard the term “after-drop”. If you’ve done any swimming in cool water, you may have experienced it. For the uninitiated, after-drop refers to the decline in your core body temperature after you have got out of the water.

When you swim in cool water the body cleverly tries to protect vital organs by reducing blood flow to the skin and limbs. Thus the core stays warm while the skin, arms and legs cool down. The process is known as peripheral vasoconstriction.

A very good video on Hypothermia > too long in water that is too cold

This is presented by The South End Rowing Club in San Francisco - where the water never really gets warm.

A few comments:

De 13 positieve effecten van kou op je lichaam

(Soest - 2020-01-27) Recent stond er in de krant dat het heel gezond kan zijn om jezelf regelmatig bloot te stellen aan lage temperaturen. Wouter van Marken Lichtenbelt, hoogleraar aan de Universiteit van Maastricht, raadt aan om regelmatig de kou op te zoeken. Volgens hem is het niet nodig om altijd een dikke sjaal en muts te dragen.

De laatste jaren zijn er in de medische literatuur steeds meer studies te vinden naar de gezondheidsvoordelen van regelmatige blootstelling aan koude temperaturen. Wim Hof, die internationaal bekend staat als ‘The Iceman’, is al lange tijd bekend met de kracht van kou. De Nederlander heeft dan ook vele kouderecords op zijn naam staan. Ook werkte hij mee aan verschillende wetenschappelijke onderzoeken. Daarbij is vastgesteld dat wij bewust ons zenuwstelsel en immuunsysteem kunnen beïnvloeden (1, 2). Meditatie en ademhaling zijn daarbij belangrijke factoren. De kracht van meditatie en ademhaling is zo groot, dat kou minder vat krijgt op lichaam en geest. Blootstelling aan kou kan de geest scherpen en trainen, maar er zijn ook vele voordelen voor het fysieke lichaam.

Neoprene and afterdrop: how to keep swimming outside this winter

With a reported 323% rise in people swimming outdoors, here is the expert guide to ensuring you take the plunge safely – even when temperatures plummet

When lockdown rules eased in May, a friend and I went for a surreptitious dip in a nearby lake. It was exactly what we needed. The shock of cold water provided the thrills, while merging into the landscape brought the bliss. Afterwards, we floated through the woods on a post-swim high. “Shall we do it again next week?” we said.

Cold water swimming advice from an Ice Mile expert

In a few weeks, Outdoor Swimmer's very own English channel soloist and ice kilometre challenger, Joanne, will be heading to Cheltenham to swim what she hopes will be her first ice kilometre swim at the Great British IISA Championships. She’s been chatting with Kate Steels throughout the winter and recently visited her at Andark lake.

Kate is the GB chair of the International Ice Swimming Association, event director of the championships at Cheltenham and an accomplished ice and marathon swimmer. Kate is one swim away from becoming the first British person, and third person ever, to complete Ice Sevens – completing an ice mile swim in every continent – with just a swim in South America needed to complete what will be an incredible feat. She's swimming in memory of her son Dan.

After-drop is real – and how to deal with it

If you have spent any time hanging around open water swimmers you may have heard the term “after-drop”. If you’ve done any swimming in cool water, you may have experienced it. For the uninitiated, after-drop refers to the decline in your core body temperature after you have got out of the water.

When you swim in cool water the body cleverly tries to protect vital organs by reducing blood flow to the skin and limbs. Thus the core stays warm while the skin, arms and legs cool down. The process is known as peripheral vasoconstriction.

Cold water immersion: kill or cure?

Like other environmental constituents, such as pressure, heat and oxygen, cold water can be either good or bad, threat or treatment, depending on circumstance. Given the current increase in the popularly of open cold water swimming, it is timely to review the various human responses to cold water immersion (CWI) and consider the strength of the claims made for the effects of CWI. As a consequence, in this review we look at the history of CWI and examine CWI as a precursor to drowning, cardiac arrest and hypothermia. We also assess its role in prolonged survival underwater, extending exercise time in the heat and treating hyperthermic casualties. More recent uses, such as in the prevention of inflammation and treatment of inflammation‐related conditions, are also considered. It is concluded that the evidence base for the different claims made for CWI are varied, and although in most instances there seems to be a credible rationale for the benefits or otherwise of CWI, in some instances the supporting data remain at the level of anecdotal speculation. Clear directions and requirements for future research are indicated by this review.

Someposts on Nuala Moore's Arctic swims

Nuala Moore at the Albatross monument on Hornos Island, Chile celebrating her monumental swim. Cape Horn marks the northern boundary of the Drake Passage and marks where the Atlantic and Pacific Oceans meet.

Congratulations to Nuala.
https://en.m.wikipedia.org/wiki/Cape_Horn

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