Swimming Three Ice Miles within Fifteen Hours

10.4077/CJP.2017.BAF467

Mirko Stjepanovic；Pantelis T. Nikolaidis；Beat Knechtle

body fat ； hypothermia ； open-water swimming

The Chinese Journal of Physiology

60卷4期（2017 / 08 / 31）

197 - 206

英文

Ice Mile swimming (1608 m in water of below 5°C) is becoming increasingly popular. This case study aimed to identify body core temperature and selected haematological and biochemical parameters before and after repeated Ice Miles. An experienced ice swimmer completed three consecutive Ice Miles within 15 h. Swim times, body core temperatures, and selected urinary and haematological parameters were recorded. Body core temperature reached its maximum between 5, 8 and 15 min after immersion (37.7°C, 38.1°C, and 38.0°C, respectively). The swimmer suffered hypothermia during the first Ice Mile (35.4°C) and body core temperature dropped furthermore to 34.5°C during recovery after the first Ice Mile. He developed a metabolic acidosis in both the first and the last Ice Mile (pH 7.31 and pH 7.34, respectively). We observed hyperkalaemia ([K^+] ＞ 5.5 mM) after the second Ice Mile (6.9 mM). This was followed by a drop in [K^+] to 3.7 mM after the third Ice Mile. Anticipatory thermogenesis (i.e. an initial increase of body core temperature after immersion in ice cold water) seems to be a physiological response in a trained athlete. The results suggest that swimming in ice-cold water leads to a metabolic acidosis, which the swimmer compensates with hyperventilation (i.e. leading to respiratory alkalosis). The shift of serum [K^+] could increase the risk of a cardiac arrhythmia. Further studies addressing the physiology and potential risks of Ice Mile swimming are required to substantiate this finding.

1. Knechtle, B.,Nikolaidis, P.T.,Rosemann, T.,Rüst, C.A.(2016).Performance trends in age group breaststroke swimmers in the FINA World Championships 1986-2014.Chinese J. Physiol.,59,247-259.
   連結：
2. Molnar, G.W. Survival of hypothermia by men immersed in the ocean. J. Am. Med. Assoc. 131: 1046-1050, 1946.
3. Asplund, C.A.,Creswell, L.L.(2016).Hypothesised mechanisms of swimming-related death: a systematic review.Brit. J. Sports Med.,50,1360-1366.
4. Atanasovska, T.,Petersen, A.C.,Rouffet, D.M.,Billaut, F.,Ng, I.,McKenna, M.J.(2014).Plasma K+ dynamics and implications during and following intense rowing exercise.J. Appl. Physiol.,117,60-68.
5. Boyce, J.A.(2006).Successful treatment of cold-induced urticaria/anaphylaxis with anti-IgE.J. Allergy Clin. Immunol.,117,1415-1418.
6. Brannigan, D.,Rogers, I.R.,Jacobs, I.,Montgomery, A.,Williams, A.,Khangure, N.(2009).Hypothermia is a significant medical risk of mass participation long-distance open water swimming.Wilderness Environ. Med.,20,14-18.
7. Debaty, G.,Moustapha, I.,Bouzat, P.,Maignan, M.,Blancher, M.,Rallo, A.,Brun, J.,Chavanon, O.,Danel, V.,Carpentier, F.,Payen, J.F.,Briot, R.(2015).Outcome after severe accidental hypothermia in the French Alps: A 10-year review.Resuscitation,93,118-123.
8. Dugue, B.,Leppanen, E.(2000).Adaptation related to cytokines in man: effects of regular swimming in ice-cold water.Clin. Physiol.,20,114-121.
9. Eichenberger, E.,Knechtle, B.,Knechtle, P.,Rüst, C.A.,Rosemann, T.,Lepers, R.(2012).Best performances by men and women open-water swimmers during the 'English Channel Swim' from 1900 to 2010.J. Sports Sci.,30,1295-1301.
10. Eichenberger, E.,Knechtle, B.,Knechtle, P.,Rüst, C.A.,Rosemann, T.,Lepers, R.,Senn, O.(2013).Sex difference in open-water ultra-swim performance in the longest freshwater lake swim in Europe.J. Strength Cond. Res.,27,1362-1369.
11. Eichenberger, E.,Knechtle, B.,Rüst, C.A.,Knechtle, P.,Lepers, R.,Rosemann, T.(2012).No gender difference in peak performance in ultra-endurance swimming performance - analysis of the 'Zurich 12-h Swim' from 1996 to 2010.Chinese J. Physiol.,55,346-351.
12. Graham, J.M.,Keatinge, W.R.(1978).Deaths in cold water.Brit. Med. J.,2,18-19.
13. Hallén, J.(1996).K+ balance in humans during exercise.Acta Physiol. Scand.,156,279-286.
14. Hart, S.R.,Bordes, B.,Hart, J.,Corsino, D.,Harmon, D.(2011).Unintended perioperative hypothermia.Ochsner J.,11,259-270.
15. Kaplan, A.P.,Gray, L.,Shaff, R.E.,Horakova, Z.,Beaven, M.A.(1975).In vivo studies of mediator release in cold urticaria and cholinergic urticaria.J. Allergy Clin. Immunol.,55,394-402.
16. Keatinge, W.,Khartchenko, M.,Lando, N.,Lioutov, V.(2001).Hypothermia during sports swimming in water below 11°C.Brit. J. Sports Med.,35,352-353.
17. Keatinge, W.R.,Prys-Roberts, C.,Cooper, K.E.,Honour, A.J.,Haight, J.(1969).Sudden failure of swimming in cold water.Brit. Med. J.,1,480-483.
18. Kjeldsen, K.(2010).Hypokalemia and sudden cardiac death.Exp. Clin. Cardiol.,15,96-99.
19. Knechtle, B.,Christinger, N.,Kohler, G.,Knechtle, P.,Rosemann, T.(2009).Swimming in ice cold water.Ir. J. Med. Sci.,178,507-511.
20. Knechtle, B.,Rosemann, T.,Lepers, R.,Rüst, C.A.(2014).Women outperform men in ultradistance swimming: the Manhattan Island Marathon Swim from 1983 to 2013.Int. J. Sports Physiol. Perform.,9,913-924.
21. Knechtle, B.,Rosemann, T.,Rüst, C.A.(2015).Ice swimming and changes in body core temperature: a case study.Springerplus,4,394.
22. Knechtle, B.,Rosemann, T.,Rüst, C.A.(2015).Women cross the 'Catalina Channel' faster than men.Springerplus,4,332.
23. Mazarakis, A.,Bardousis, K.,Almpanis, G.,Mazaraki, I.,Markou, S.,Kounis, N.G.(2014).Kounis syndrome following cold urticaria: the swimmer's death.Int. J. Cardiol.,176,e52-e53.
24. McCullough, L.,Arora, S.(2004).Diagnosis and treatment of hypothermia.Am. Fam. Physician.,70,2325-2332.
25. Noakes, T.D.,Dugasa, L.R.,Tuckera, R.,Oksab, J.,Dunnc, J.,van der Merwec, B.S.,Dirkerc, J.A.,Porvarid, K.,Smolandere, J.(2009).Body temperatures during three long-distance polar swims in water of 0-3°C.J. Therm. Biol.,34,23-31.
26. Nuckton, T.J.,Claman, D.M.,Goldreich, D.,Wendt, F.C.,Nuckton, J.G.(2000).Hypothermia and afterdrop following open water swimming: the Alcatraz/San Francisco swim study.Am. J. Emerg. Med.,18,703-707.
27. Polderman, K.H.(2009).Mechanisms of action, physiological effects, and complications of hypothermia.Crit. Care Med.,37,S186-S202.
28. Rüst, C.A.,Knechtle, B.,Rosemann, T.(2012).Changes in body core and body surface temperatures during prolonged swimming in water of 10°C-a case report.Extrem. Physiol. Med.,1,8.
29. Schaub, P.,Knechtle, B.,Rüst, C.A.,Rosemann, T.(2015).Differences in swimming speed between short and long course from 50 m to 1,500 m in elite female and male Swiss freestyle age group swimmers.Adapt. Med.,7,186-195.
30. Sejersted, O.M.,Sjøgaard, G.(2000).Dynamics and consequences of potassium shifts in skeletal muscle and heart during exercise.Physiol. Rev.,80,1411-1481.
31. Wacharasint, P.,Nakada, T.A.,Boyd, J.H.,Russell, J.A.,Walley, K.R.(2012).Normal-range blood lactate concentration in septic shock is prognostic and predictive.Shock,38,4-10.
32. Wagner, S.,Knechtle, B.,Knechtle, P.,Rüst, C.A.,Rosemann, T.(2012).Higher prevalence of exercise-associated hyponatremia in female than in male open-water ultra-endurance swimmers: the 'Marathon-Swim' in Lake Zurich.Eur. J. Appl. Physiol.,112,1095-1106.
33. Zavorsky, G.S.,Cao, J.,Mayo, N.E.,Gabbay, R.,Murias, J.M.(2007).Arterial versus capillary blood gases: a meta-analysis.Respir. Physiol. Neurobiol.,155,268-279.