Alterations in Body Fluid Balance During Fin Swimming in 29°C Water in a Population of Special Forces Divers

Abstract

Highly trained “combat swimmers” encounter physiological difficulties when performing missions in warm water. The aim of this study was to assess the respective roles of immersion and physical activity in perturbing fluid balance of military divers on duty in warm water. 12 trained divers performed 2 dives each (2 h, 3 m depth) in fresh water at 29°C. Divers either remained Static or swam continuously (Fin) during the dive. In the Fin condition, oxygen consumption and heart rate were 2-fold greater than during the Static dive. Core and skin temperatures were also higher (Fin: 38.5±0.4°C and 36.2±0.3°C and Static: 37.2±0.3°C and 34.3±0.3°C; respectively p=0.0002 and p=0.0003). During the Fin dive, the average mass loss was 989 g (39% urine loss, 41% sweating and 20% insensible water loss and blood sampling); Static divers lost 720 g (84% urine loss, 2% sweating and 14% insensible water loss and blood sampling) (p=0.003). In the Fin condition, a greater decrease in total body mass and greater sweating occurred, without effects on circulating renin and aldosterone concentrations; diuresis was reduced, and plasma volume decreased more than in the Static condition.

Key words

special forces divers - exercise - immersion diuresis - plasma volume - SCUBA dive - sweat

• References

• 1 Aoyagi Y, McLellan TM, Shephard RJ. Determination of body heat storage: how to select the weighting of rectal and skin temperatures for clothed subjects. Int Arch Occup Environ Health 1996; 68: 325-336
• 2 Arborelius Jr M, Balldin UI, Lila B, Lundgren CE. Regional lung function in man during immersion with the head above water. Aerospace Med 1972; 43: 701-707
• 3 Beckett MB, Hodgdon JA. Heat production and optimal cooling for Navy special warfare divers. In: Naval Health Research Center; San Diego CA: 1990: 121-123
• 4 Busse MW, Maassen N. Effect of consecutive exercise bouts on plasma potassium concentration during exercise and recovery. Med Sci Sports Exerc 1989; 21: 489-493
• 5 Castagna O, Blatteau JE, Vallee N, Schmid B, Regnard J. The underestimated compression effect of neoprene wetsuit on divers hydromineral homeostasis. Int J Sports Med 2013; 34: 1043-1050
• 6 Clausen T. Na+-K+ pump regulation and skeletal muscle contractility. Physiol Rev 2003; 83: 1269-1324
• 7 Coyle EF, Gonzalez-Alonso J. Cardiovascular drift during prolonged exercise: new perspectives. Exerc Sport Sci Rev 2001; 29: 88-92
• 8 DiBona GF, Kopp UC. Neural control of renal function. Physiol Rev 1997; 77: 75-197
• 9 Dill DB, Costill DL. Calculation of percentage changes in volumes of blood, plasma, and red cells in dehydration. J Appl Physiol 1974; 37: 247-248
• 10 Doubt TJ. Cardiovascular and thermal responses to SCUBA diving. Med Sci Sports Exerc 1996; 28: 581-586
• 11 Epstein M. Renal effects of head-out water immersion in man: implications for an understanding of volume homeostasis. Physiol Rev 1978; 58: 529-581
• 12 Epstein M. Renal effects of head-out water immersion in humans: a 15-year update. Physiol Rev 1992; 72: 563-621
• 13 Epstein M, Levinson R, Loutzenhiser R. Effects of water immersion on renal hemodynamics in normal man. J Appl Physiol 1976; 41: 230-233
• 14 Gonzalez-Alonso J. Hyperthermia impairs brain, heart and muscle function in exercising humans. Sports Med 2007; 37: 371-373
• 15 Greenleaf JE, Castle BL. Exercise temperature regulation in man during hypohydration and hyperhydration. J Appl Physiol 1971; 30: 847-853
• 16 Greenleaf JE, Shevartz E, Keil LC. Hemodilution, vasopressin suppression, and diuresis during water immersion in man. Aviat Space Environ Med 1981; 52: 329-336
• 17 Guyton A, Taylor A, Granger H. Dynamics and control of the body fluids. In: Saunders W. (ed.). Circulatory physiology. Philadelphia. 1975: 397
• 18 Hardy JD, Du Bois D. The technique of measuring radiation and convection. J Nutr 1938; 15: 461-475
• 19 Harriss DJ, Atkinson G. Ethical standards in sport and exercise science research: 2014 update. Int J Sports Med 2013; 34: 1025-1028
• 20 Hope A, Aanderud L, Aakvaag A. Dehydration and body fluid-regulating hormones during sweating in warm (38 degrees C) fresh- and seawater immersion. J Appl Physiol 2001; 91: 1529-1534
• 21 ISO . 7933-Ergonomics of the thermal environment. Analytical determination and interpretation of heat stress using calculation of the predicted heat strain. International Standards Organization; Geneva: 2005
• 22 ISO . 8996-Ergonomics of the thermal environment. Determination of metabolic rate. International Standards Organization; Geneva: 2005
• 23 Jay O, Reardon FD, Webb P, Ducharme MB, Ramsay T, Nettlefold L, Kenny GP. Estimating changes in mean body temperature for humans during exercise using core and skin temperatures is inaccurate even with a correction factor. J Appl Physiol 2007; 103: 443-451
• 24 Jimenez C, Regnard J, Robinet C, Mourot L, Gomez-Merino D, Chennaoui M, Jammes Y, Dumoulin G, Desruelle AV, Melin B. Whole body immersion and hydromineral homeostasis: effect of water temperature. Eur J Appl Physiol 2010; 108: 49-58
• 25 Johansen LB, Foldager N, Stadeager C, Kristensen MS, Bie P, Warberg J, Kamegai M, Norsk P. Plasma volume, fluid shifts, and renal responses in humans during 12 h of head-out water immersion. J Appl Physiol 1992; 73: 539-544
• 26 Johansen LB, Pump B, Warberg J, Christensen NJ, Norsk P. Preventing hemodilution abolishes natriuresis of water immersion in humans. Am J Physiol 1998; 275: R879-R888
• 27 Johnson JM, O’Leary DS, Taylor WF, Park MK. Reflex regulation of sweat rate by skin temperature in exercising humans. J Appl Physiol 1984; 56: 1283-1288
• 28 Larsen AS, Johansen LB, Stadeager C, Warberg J, Christensen NJ, Norsk P. Volume-homeostatic mechanisms in humans during graded water immersion. J Appl Physiol 1994; 77: 2832-2839
• 29 Lundvall J, Mellander S, Westling H, White T. Fluid transfer between blood and tissues during exercise. Acta Physiol Scand 1972; 85: 258-269
• 30 Maughan RJ, Fenn CE, Leiper JB. Effects of fluid, electrolyte and substrate ingestion on endurance capacity. Eur J Appl Physiol 1989; 58: 481-486
• 31 Maughan RJ, Leiper JB, Shirreffs SM. Factors influencing the restoration of fluid and electrolyte balance after exercise in the heat. Br J Sports Med 1997; 31: 175-182
• 32 McDonough A, Thompson C, Youn J. Skeletal muscle regulates extracellular potassium. Am J Physiol 2002; 282: F967-F974
• 33 McKenna MJ, Bangsbo J, Renaud JM. Muscle K+, Na+, and Cl disturbances and Na+-K+ pump inactivation: implications for fatigue. J Appl Physiol 1985 2008; 104: 288-295
• 34 Miki K, Klocke MR, Hong SK, Krasney JA. Interstitial and intravascular pressures in conscious dogs during head-out water immersion. Am J Physiol 1989; 257: R358-R364
• 35 Morris CK, Myers J, Froelicher VF, Kawaguchi T, Ueshima K, Hideg A. Nomogram based on metabolic equivalents and age for assessing aerobic exercise capacity in men. J Am Coll Cardiol 1993; 22: 175-182
• 36 Mosteller RD. Simplified calculation of body-surface area. N Engl J Med 1987; 317: 1098
• 37 Mourot L, Wolf JP, Galland F, Robinet C, Courtiere A, Bouhaddi M, Meliet JL, Regnard J. Short-term vasomotor adjustments to post immersion dehydration are hindered by natriuretic peptides. J Undersea Hyperbar Med 2004; 31: 203-210
• 38 Norsk P, Bonde-Petersen F, Warberg J. Arginine vasopressin, circulation, and kidney during graded water immersion in humans. J Appl Physiol 1986; 61: 565-574
• 39 Olsson KE, Saltin B. Physical training. 6. Food and drink in training and competition. Lakartidningen 1970; 67: 4568-4576
• 40 Olsson KE, Saltin B. Variation in total body water with muscle glycogen changes in man. Acta Physiol Scand 1970; 80: 11-18
• 41 Pendergast DR, Lundgren CE. The underwater environment: cardiopulmonary, thermal, and energetic demands. J Appl Physiol 2009; 106: 276-283
• 42 Pendergast DR, Tedesco M, Nawrocki DM, Fisher NM. Energetics of underwater swimming with SCUBA. Med Sci Sports Exerc 1996; 28: 573-580
• 43 Rim H, Yun YM, Lee KM, Kwak JT, Ahn DW, Choi JK, Kim KR, Joh YD, Kim JY, Park YS. Effect of physical exercise on renal response to head-out water immersion. Appl Human Sci 1997; 16: 35-43
• 44 Sawka MN, Gonzalez RR, Young AJ, Muza SR, Pandolf KB, Latzka WA, Dennis RC, Valeri CR. Polycythemia and hydration: effects on thermoregulation and blood volume during exercise-heat stress. Am J Physiol 1988; 255: R456-R463
• 45 Sawka MN, Young AJ, Pandolf KB, Dennis RC, Valeri CR. Erythrocyte, plasma, and blood volume of healthy young men. Med Sci Sports Exerc 1992; 24: 447-453
• 46 Schlader ZJ, Gagnon D, Adams A, Rivas E, Cullum CM, Crandall CG. Cognitive and perceptual responses during passive heat stress in younger and older adults. Am J Physiol 2015; 308: R847-R854
• 47 Schou M, Gabrielsen A, Bruun NE, Skott P, Pump B, Dige-Petersen H, Frandsen E, Bie P, Warberg J, Christensen NJ, Norsk P. Angiotensin II attenuates the natriuresis of water immersion in humans. Am J Physiol 2002; 283: R187-R196
• 48 Sheldahl LM, Tristani FE, Connelly TP, Levandoski SG, Skelton MM, Cowley Jr AW. Fluid-regulating hormones during exercise when central blood volume is increased by water immersion. Am J Physiol 1992; 262: R779-R785
• 49 Simmons SE, Saxby BK, McGlone FP, Jones DA. The effect of passive heating and head cooling on perception, cardiovascular function and cognitive performance in the heat. Eur J Appl Physiol 2008; 104: 271-280
• 50 Stadeager C, Johansen LB, Warberg J, Christensen NJ, Foldager N, Bie P, Norsk P. Circulation, kidney function, and volume-regulating hormones during prolonged water immersion in humans. J Appl Physiol 1992; 73: 530-538
• 51 Zamparo P, Pendergast DR, Termin A, Minetti AE. Economy and efficiency of swimming at the surface with fins of different size and stiffness. Eur J Appl Physiol 2006; 96: 459-470
• 52 Zoladz JA, Duda K, Majerczak J, Thor P. Effect of different cycling frequencies during incremental exercise on the venous plasma potassium concentration in humans. Physiol Res 2002; 51: 581-586