Yli neljän tunnin lenkit altistavat merkittävästi jopa tappavalle hyponatremialle (kts. alla).
Hyponatremia among Runners in the Boston Marathon
N Engl J Med. 2005 Apr 14;352(15):1550-6.
ABSTRACT
Background
Hyponatremia has emerged as an important cause of race-related death and life-threatening illness among marathon runners. We studied a cohort of marathon runners to estimate the incidence of hyponatremia and to identify the principal risk factors.
Methods
Participants in the 2002 Boston Marathon were recruited one or two days before the race. Subjects completed a survey describing demographic information and training history. After the race, runners provided a blood sample and completed a questionnaire detailing their fluid consumption and urine output during the race. Prerace and postrace weights were recorded. Multivariate regression analyses were performed to identify risk factors associated with hyponatremia.
Results
Of 766 runners enrolled, 488 runners (64 percent) provided a usable blood sample at the finish line. Thirteen percent had hyponatremia (a serum sodium concentration of 135 mmol per liter or less); 0.6 percent had critical hyponatremia (120 mmol per liter or less). On univariate analyses, hyponatremia was associated with substantial weight gain, consumption of more than 3 liters of fluids during the race, consumption of fluids every mile, a racing time of >4:00 hours, female sex, and low body-mass index. On multivariate analysis, hyponatremia was associated with weight gain (odds ratio, 4.2; 95 percent confidence interval, 2.2 to 8.2), a racing time of >4:00 hours (odds ratio for the comparison with a time of
Hyponatremia among Runners in the Boston Marathon
N Engl J Med. 2005 Apr 14;352(15):1550-6.
ABSTRACT
Background
Hyponatremia has emerged as an important cause of race-related death and life-threatening illness among marathon runners. We studied a cohort of marathon runners to estimate the incidence of hyponatremia and to identify the principal risk factors.
Methods
Participants in the 2002 Boston Marathon were recruited one or two days before the race. Subjects completed a survey describing demographic information and training history. After the race, runners provided a blood sample and completed a questionnaire detailing their fluid consumption and urine output during the race. Prerace and postrace weights were recorded. Multivariate regression analyses were performed to identify risk factors associated with hyponatremia.
Results
Of 766 runners enrolled, 488 runners (64 percent) provided a usable blood sample at the finish line. Thirteen percent had hyponatremia (a serum sodium concentration of 135 mmol per liter or less); 0.6 percent had critical hyponatremia (120 mmol per liter or less). On univariate analyses, hyponatremia was associated with substantial weight gain, consumption of more than 3 liters of fluids during the race, consumption of fluids every mile, a racing time of >4:00 hours, female sex, and low body-mass index. On multivariate analysis, hyponatremia was associated with weight gain (odds ratio, 4.2; 95 percent confidence interval, 2.2 to 8.2), a racing time of >4:00 hours (odds ratio for the comparison with a time of
Vastaukset 6
Vanhimmat
muitakin syitä. Lukekaa juttu tarkasti.
Tottahan tuo on tietysti. Sen vuoksi maratoninkin osallistumisen aikaraja pitäisi olla tuo neljä tuntia. Ylipäätäänkin on hölmöä puhua maratonin juoksemisesta jos aikaa kuluu yli neljä tuntia. Kolme tuntia olisi järkevämpi raja. Sitä voi ehkä kutsua jo juoksemiseksi.
hyponatremian ongelma poistuu neljän tunnin aikarajan ansiosta. Miten tuo aikaraja sitten toteutettaisiinkin.
Jos ei muulla keinolla yli kolmen tunnin jälkeen juoksija pysähdy reitille, niin sitten vaikka laitetaan autoja tien eteen parkkiin.
Vuonna 2006 Suomessa meni alle 3 tunnin vain 238 miesjuoksijaa ja 9 naista. Myöskään ultrajuoksijat eivät näistä rajoista innostune.
Kyseessähän on siis natriumin puutostila, johon voi johtaa suorituksen aikana tapahtuva pelkän veden juonti. Juoman tulisi siis sisältää myös natriumia.
Ks. myös http://en.wikipedia.org/wiki/Hyponatremia