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Does a 24-hour ultra-swim lead to dehydration?
Abstract
We investigated the change in body composition and hydration status in one male ultra-endurance swimmer during a 24-hour swim. Body mass, percent body fat and skeletal muscle mass using the anthropometric method as well as total body water using bioelectrical impedance analysis were determined pre race, every 6 hours and after the race. Parameters of hydration status (urinary specific gravity, haematocrit, plasma sodium) and skeletal muscle damage (plasma urea) were measured at the same time. The swimmer achieved a total distance of 41.1 km. Body mass decreased by 1.6 kg, skeletal muscle mass by 1.5 kg, body fat by 2.4 kg and total body water by 3.9 l. Urinary specific gravity remained unchanged at 1.015 g/ml. Haematocrit increased from 46 to 47, plasma volume decreased by 4 % and plasma sodium by 4.0 mmol/l. We found in this ultra-swimmer a decrease in body mass of 1.7 % and a consistent urinary specific gravity of 1.015 g/ml. According to the general concept of dehydration, this corresponds to minimal dehydration.
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Achten, J., Jeukendrup, A.E. Heart rate monitoring: applications and limitations. Sports Med. 2003; 33:517-538. https://doi.org/10.2165/00007256-200333070-00004
Armstrong, L.E., Soto, J.A., Hacker, F.T. Jr, Et Al. Urinary indices during dehydration, exercise, and rehydration. Int J Sport Nutr. 1998; 8:345-355. https://doi.org/10.1123/ijsn.8.4.345
Atwater, W.O. Coefficients of digestibility and availability of the nutrients of food. Proc Am Physiol Soc. 1909; 30:14-19.
Ball, S.D., Altena, T.S., Swan, P.D. Comparison of anthropometry to DXA: a new prediction equation for men. Eur J Clin Nutr. 2004; 58:1525-1531. https://doi.org/10.1038/sj.ejcn.1602003
Beaumont Van, W. Evaluation of hemoconcentration from hematocrit measurements. J Appl Physiol. 1972; 32:712-713.
Becque, M.D., Katch, V.L., Moffatt, R.J. Time course of skin-plus-fat compression in males and females. Hum Biol. 1986; 58:33-42.
Berneis, K., Keller, U. Bioelectrical impedance analysis during acute changes of extracellular osmolality in man. Clin Nutr. 2000; 19:361-366. https://doi.org/10.1054/clnu.2000.0133
Bircher, S., Enggist, A., Jehle, T., Knechtle, B. Effects of an extreme endurance race on energy balance and body composition – a case study. J Sports Sci Med. 2006; 5:154-162.
Bonifazi, M., Bela, E., Carli, G., Et Al. Responses of atrial natriuretic peptide and other fluid regulating hormones to long distance swimming in the sea. Eur J Appl Physiol. 1994; 68:504-507. https://doi.org/10.1007/BF00599520
Cox, G.R., Broad, E.M., Riley, M.D., Burke, L.M. Body mass changes and voluntary fluid intakes of elite level water polo players and swimmers. J Sci Med Sport. 2002; 5:183-193. https://doi.org/10.1016/S1440-2440(02)80003-2
Coyle, E.F., Martin, W.H., Ehsani, A.A., Et Al. Blood lactate threshold in some well-trained ischemic heart disease patients. J Appl Physiol. 1983; 54:628-634.
Davidson, L., Mcneill, G., Haggarty, P., Smith, J.S., Franklin, M.F. Free-living energy expenditure of adult men assessed by continuous heart-rate monitoring and doubly-labelled water. Br J Nutr. 1997; 78:695-708. https://doi.org/10.1079/BJN19970188
Erickson, K.A., Wilding, P. Evaluation of a novel point-of-care system, the i-STAT portable clinical analyzer. Clin Chem. 1993; 39:283-287.
Fellmann, N., Ritz, P., Ribeyre, J., Beaufrère, B., Delaître, M., Coudert, J. Intracellular hyperhydration induced by a 7-day endurance race. Eur J Appl Physiol. 1999; 80:353-359. https://doi.org/10.1007/s004210050603
Frayn, K.N. Calculation of substrate oxidation rates in vivo from gaseous exchange. J Appl Physiol. 1983; 55:628-634.
Gastmann, U., Dimeo, F., Huonker, M., Et Al. Ultra-triathlon-related blood-chemical and endocrinological responses in nine athletes. J Sports Med Phys Fitness. 1998; 38:18-23.
Goodman, C., Rogers, G.G., Vermaak, H., Goodman, M.R. Biochemical responses during recovery from maximal and submaximal swimming exercise. Eur J Appl Physiol. 1985; 54:436-441. https://doi.org/10.1007/BF02337191
Gudivaka, R., Schoeller, D.A., Kushner, R.F., Bolt, M.J.G. Single- and multifrequency models for bioelectrical impedance analysis of body water compartments. J Appl Physiol. 1999; 87:1087-1096.
Hiilloskorpi, H.K., Pasanen, M.E., Fogelholm, M.G., Laukkanen, R.M., Manttari, A.T. Use of heart rate to predict energy expenditure from low to high activity levels. Int J Sport Med. 2003; 24:332-336. https://doi.org/10.1055/s-2003-40701
Höchli, D., Schneiter, T., Ferretti, G., Et Al. Loss of muscle oxidative capacity after an extreme endurance run: The Paris-Dakar Foot-Race. Int J Sports Med. 1995; 16:343-346. https://doi.org/10.1055/s-2007-973017
Jacobs, E., Vadasi, E., Sarkozi, L., Colman, N. Analytical evaluation of i-STAT portable clinical analyzer and use by nonlaboratory health-care professionals. Clin Chem. 1993; 39:1069-1074
Jebb, S.A., Cole, T.J., Doman, D., Murgatroyd, P.R., Prentice, A.M. Evaluation of the novel Tanita body-fat analyser to measure body composition by comparison with a four-compartment model. Br J Nutr. 2000; 83:115-122. https://doi.org/10.1017/S0007114500000155
Kao, W.F., Shyu, C.J., Yang, X.W., Et Al. Athletic performance and serial weight changes during 12- and 24-hour ultra-marathons. Clin J Sport Med. 2008; 18:155-158. https://doi.org/10.1097/JSM.0b013e31815cdd37
Kashiwazaki, H. Heart rate monitoring as a field method for estimating energy expenditure as evaluated by the doubly labeled water method. J Nutr Sci Vitaminol. 1999; 45:79-94. https://doi.org/10.3177/jnsv.45.79
Kavouras, S.A. Assessing hydration status. Curr Opin Clin Nutr Metab Care. 2002; 5:519-524. https://doi.org/10.1097/00075197-200209000-00010
Keytel, L.R., Goedecke, J.H., Noakes, T.D., Et Al. Prediction of energy expenditure from heart rate monitoring during submaximal exercise. J Sports Sci. 2005; 23:289-297. https://doi.org/10.1080/02640410470001730089
Kirchhoff, E. Online-Publication of the German Food Composition Table 'Souci–Fachmann–Kraut' on the Internet. J Food Compost Anal. 2002; 15:465-472. https://doi.org/10.1006/jfca.2002.1091
Knechtle, B., Müller, G., Willmann, F., Eser, P., Knecht, H. Comparison of fat oxidation in arm cranking in spinal cord-injured people versus ergometry in cyclists. Eur J Appl Physiol. 2003; 90:614-619. https://doi.org/10.1007/s00421-003-0920-5
Knechtle, B., Knechtle, P., Heusser, D. Energieumsatz bei Langstreckenschwimmen – eine Fallbeschreibung. Ö J Sportmed. 2004; 3:27-32.
Knechtle, B., Baumann, B., Knechtle, P. Effect of ultra-endurance swimming on body composition – Marathon Swim 2006 from Rapperswil to Zurich. Praxis. 2007; 96:585-589. https://doi.org/10.1024/1661-8157.96.15.585
Knechtle, B., Knechtle, P., Kaul, R., Kohler, G. Swimming for 12 hours leads to no reduction of adipose subcutaneous tissue – a case study. Praxis. 2007; 96:1805-1810. https://doi.org/10.1024/1661-8157.96.46.1805
Knechtle, B., Salas, O.F., Andonie, J.L., Kohler, G. Effect of a multistage ultra-endurance triathlon on body composition: World Challenge Deca Iron Triathlon 2006. Br J Sport Med. 2008; 42:121-125. https://doi.org/10.1136/bjsm.2007.038034
Knechtle, B., Duff, B., Schule, I., Kohler, G. A multi-stage ultra-endurance run over 1,200 km leads to a continuous accumulation of total body water. J Sports Sci Med. 2008; 7:357-364.
Knechtle, B., Knechtle, P., Kaul, R., Kohler, G. Body composition changes in females during 12 hours of endurance swimming. Int J Perf Anal Sport. 2008; 8:27-39.
Knechtle, B., Wirth, A., Knechtle, P., Kohler, G. Increase of total body water in face of a decrease of body mass during non-stop running 100 km – formation of oedema? Res Q Exerc Sport. 2009; 80:593-603. https://doi.org/10.1080/02701367.2009.10599598
Lee, R.C., Wang, Z., Heo, M., Ross, R., Janssen, I., Heymsfield, S.B. Total-body skeletal muscle mass: development and cross-validation of anthropometric prediction models. Am J Clin Nutr. 2000; 72:796-803.
Li, R., Deurenberg, P., Hautvast, J.G.A.J. A critical evaluation of heart rate monitoring to assess energy expenditure in individuals. Am J Clin Nutr. 1993; 58:602-607.
Livingstone, M.B., Prentice, A.M., Coward, W.A., Et Al. Simultaneous measurement of free-living energy expenditure by the doubly labelled water method and heart-rate monitoring. Am J Clin Nutr. 1990; 52:59-65.
Louana, J., Campion, F., Noakes, T.D., Medelli, J. Relationship between %HRmax, %HR reserve, %VO2max, and %VO2 reserve in elite cyclists. Med Sci Sports Exerc. 2007; 39:350-357. https://doi.org/10.1249/01.mss.0000246996.63976.5f
Mckechnie, J.K., Leary, W.P., Noakes, T.D. Metabolic responses to a 90 km running race. S Afr Med J. 1982; 27:482-484.
Milledge, J.S., Bryson, E.I., Catley, D.M., Et Al. Sodium balance, fluid homeostasis and the renin-aldosterone system during the prolonged exercise of hill walking. Clin Sci. 1982; 62:595-604. https://doi.org/10.1042/cs0620595
Neumayr, G., Pfister, R., Mitterbauer, G., Et Al. Short-term effects of prolonged strenuous endurance exercise on the level of haematocrit in amateur cyclists. Int J Sports Med. 2002; 23:158-161. https://doi.org/10.1055/s-2002-23169
O'brien, C., Young, A.J., Sawka, M.N. Bioelectrical impedance to estimate changes in hydration status. Int J Sports Med. 2002; 23:361-366. https://doi.org/10.1055/s-2002-33145
Papadea, C., Foster, C., Grant, S., Et Al. Evaluation of the i-STAT portable clinical analyzer for point-of-care blood testing in the intensive care units of a university children's hospital. Ann Clin Lab Sci. 2002; 32:231-243.
Pialoux, V., Mischler, I., Mounier, R., Et Al. Effect of equilibrated hydration changes on total body water estimates by bioelectrical impedance analysis. Br J Nutr. 2004; 91:153-159. https://doi.org/10.1079/BJN20031031
Rama, R., Ibáñez, J., Riera, M., Prats, M.T., Pagés, T., Palacios, L. Hematological, electrolyte, and biochemical alterations after a 100-km run. Can J Appl Physiol. 1994; 19:411-420. https://doi.org/10.1139/h94-033
Schneider, J., Dudziak, R., Westphal, K., Vettermann, J. The i-STAT analyzer. A new, hand-held device for the bedside determination of hematocrit, blood gases, and electrolytes. Anaesthesist. 1997; 46:704-714. https://doi.org/10.1007/s001010050457
Segal, K.R., Burastero, S., Chun, A., Coronel, P., Pierson, R.N., Wang, J. Estimation of extracellular and total body water by multiple-frequency bioelectrical-impedance measurement. Am J Clin Nutr. 1991; 54:26-29.
Shireffs, S.M. Markers of hydration status. Eur J Clin Nutr. 2003; 57:S6-S9. https://doi.org/10.1038/sj.ejcn.1601895
Soler, R., Echegaray, M., Rivera, M.A. Thermal responses and body fluid balance of competitive male swimmers during a training session. J Strength Cond Res. 2003; 17:362-367.
Stellingwerff, T., Boon, H., Jonkers, R.A., Et Al. Significant intramyocellular lipid use during prolonged cycling in endurance-trained males as assessed by three different methodologies. Am J Physiol. 2007; 292:E1715-1723. https://doi.org/10.1152/ajpendo.00678.2006
Whiting, P.H., Maughan, R.J., Miller, J.D. Dehydration and serum biochemical changes in marathon runners. Eur J Appl Physiol. 1984; 52:183-187. https://doi.org/10.1007/BF00433390
Zehnder, M., Ith, M., Kreis, R., Saris, W., Boutellier, U., Boesch, C. Gender-specific usage of intramyocellular lipids and glycogen during exercise. Med Sci Sports Exerc. 2005; 37:1517-1524. https://doi.org/10.1249/01.mss.0000177478.14500.7c
DOI: https://doi.org/10.4100/jhse.2011.61.08
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