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Effect of Regular Winter Swimming on the Activity of the Sympathoadrenal System Before and After a Single Cold Water Immersion by Pirkko Huttunen; Hannu Rintamäki; Jorma Hirvonen is a Health Professions article available to read on EtoBox.

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This study deals with the adaptation of the sympathoadrcnal respons(~S to an acute cold water immersion in ordinary winter swimmers. Hormonal responses were determined at the beginning of the winter swimming period in the autumn and after regular swimming for one and three months. Water temperature in the river was I O"C at the beginning and 4"C after one and three months. The mean duration of the test immersion was 36 s. Plasma catet•holamine levels detnmined before the test immersion decreased with the winti'r swimming period for one month (NA, p< 0.001, A, p< 0.01 ). The test immersion significantly incrcas(•d noradn•naline levels (p< 0.001 ). Plasma adrenaline ami snum cortisol levels wen• intn•ased or decreased by the immt~rsion. After 1 month's swimming the test immersion to 4"C increased noradrenaline to a similar level than the immersion to 1 O"C at the beginning. Regularly practised winter swimming for three months led to diminished catecholamine levels measured immediately after the test immersion (p< 0.0 I). The results suggest that cold adaptation induced hy winter swimming attenuates the catecholamine responses to cold w atn. Adrenaline responses are also alfc•cted by

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Author

Pirkko Huttunen; Hannu Rintamäki; Jorma Hirvonen

Publisher

Informa UK Limited

Published

2001

Language

EN

Field

Health Professions (Health Sciences)