Three Independent Biological Mechanisms Cause Exercise-Associated Hyponatremia: Evidence from 2,135 Weighed Competitive Athletic Performances

To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39...

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Published inProceedings of the National Academy of Sciences - PNAS Vol. 102; no. 51; pp. 18550 - 18555
Main Authors T. D. Noakes, K. Sharwood, D. Speedy, T. Hew, S. Reid, J. Dugas, C. Almond, P. Wharam, L. Weschler, Myers, Norman
Format Journal Article
LanguageEnglish
Published United States National Academy of Sciences 20.12.2005
National Acad Sciences
Subjects
Online AccessGet full text
ISSN0027-8424
1091-6490
DOI10.1073/pnas.0509096102

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Abstract To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na+]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na+] between 129-135 mmol/liter, and 11% a serum [Na+] of <129 mmol/liter. Serum [Na+] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na+] in a subset of 18 subjects was predicted from the amount of Na+ that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na+] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na+], requiring the addition of significant amounts of Na+ (>500 mmol) into an expanded volume of total body water. This Na+ likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na+ or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.
AbstractList To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na+]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na+] between 129-135 mmol/liter, and 11% a serum [Na+] of <129 mmol/liter. Serum [Na+] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na+] in a subset of 18 subjects was predicted from the amount of Na+ that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na+] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na+], requiring the addition of significant amounts of Na+ (>500 mmol) into an expanded volume of total body water. This Na+ likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na+ or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.
To evaluate the role of fluid and Na + balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na + concentrations ([Na + ]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na + ]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na + ] between 129-135 mmol/liter, and 11% a serum [Na + ] of <129 mmol/liter. Serum [Na + ] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na + ] in a subset of 18 subjects was predicted from the amount of Na + that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na + ] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na + ], requiring the addition of significant amounts of Na + (>500 mmol) into an expanded volume of total body water. This Na + likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who ( i ) drink to excess during exercise, ( ii ) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and ( iii ) osmotically inactivate circulating Na + or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.
To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na+]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na+] between 129-135 mmol/liter, and 11% a serum [Na+] of <129 mmol/liter. Serum [Na+] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na+] in a subset of 18 subjects was predicted from the amount of Na+ that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na+] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na+], requiring the addition of significant amounts of Na+ (>500 mmol) into an expanded volume of total body water. This Na+ likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na+ or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na+]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na+] between 129-135 mmol/liter, and 11% a serum [Na+] of <129 mmol/liter. Serum [Na+] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na+] in a subset of 18 subjects was predicted from the amount of Na+ that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na+] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na+], requiring the addition of significant amounts of Na+ (>500 mmol) into an expanded volume of total body water. This Na+ likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na+ or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.
To evaluate the role of fluid and Na + balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na + concentrations ([Na + ]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na + ]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na + ] between 129-135 mmol/liter, and 11% a serum [Na + ] of <129 mmol/liter. Serum [Na + ] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na + ] in a subset of 18 subjects was predicted from the amount of Na + that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na + ] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na + ], requiring the addition of significant amounts of Na + (>500 mmol) into an expanded volume of total body water. This Na + likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who ( i ) drink to excess during exercise, ( ii ) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and ( iii ) osmotically inactivate circulating Na + or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985. endurance exchangeable Na+ stores fluid overload overdrinking syndrome of inappropriate ADH secretion
To evaluate the role of fluid and Na super(+) balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na super(+) concentrations ([Na super(+)]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na super(+)]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na super(+)] between 129-135 mmol/liter, and 11% a serum [Na super(+)] of <129 mmol/liter. Serum [Na super(+)] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na super(+)] in a subset of 18 subjects was predicted from the amount of Na super(+) that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na super(+)] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na super(+)], requiring the addition of significant amounts of Na super(+) (>500 mmol) into an expanded volume of total body water. This Na super(+) likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na super(+) or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.
To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in body weight were analyzed in 2,135 athletes in endurance events. Eighty-nine percent of athletes completed these events either euhydrated (39%) or with weight loss (50%) and with normal (80%) or elevated (13%) serum [Na+]. Of 231 (11%) athletes who gained weight during exercise, 70% were normonatremic or hypernatremic, 19% had a serum [Na+] between 129-135 mmol/liter, and 11% a serum [Na+] of <129 mmol/liter. Serum [Na+] after racing was a linear function with a negative slope of the body weight change during exercise. The final serum [Na+] in a subset of 18 subjects was predicted from the amount of Na+ that remained osmotically inactive at the completion of the trial. Weight gain consequent to excessive fluid consumption was the principal cause of a reduced serum [Na+] after exercise, yet most (70%) subjects who gained weight maintained or increased serum [Na+], requiring the addition of significant amounts of Na+ (>500 mmol) into an expanded volume of total body water. This Na+ likely originated from osmotically inactive, exchangeable stores. Thus, EAH occurs in athletes who (i) drink to excess during exercise, (ii) retain excess fluid because of inadequate suppression of antidiuretic hormone secretion, and (iii) osmotically inactivate circulating Na+ or fail to mobilize osmotically inactive sodium from internal stores. EAH can be prevented by insuring that athletes do not drink to excess during exercise, which has been known since 1985.[PUBLICATION ABSTRACT]
Author Myers, Norman
T. D. Noakes
J. Dugas
T. Hew
P. Wharam
K. Sharwood
D. Speedy
S. Reid
C. Almond
L. Weschler
AuthorAffiliation University of Cape Town/Medical Research Council Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town/Sports Science Institute of South Africa, Newlands, 7700, South Africa; ‡ Department of General Practice and Primary Care, University of Auckland, Aukland 1020, New Zealand; § Sports Medicine Practice, St. Helen's Hospital, Hobart 7216, Tasmania, Australia; ¶ Department of Cardiology, Children's Hospital, Boston, MA 02115; and ∥ 161 Richdale Road, Colts Neck, NJ 07722
AuthorAffiliation_xml – name: University of Cape Town/Medical Research Council Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town/Sports Science Institute of South Africa, Newlands, 7700, South Africa; ‡ Department of General Practice and Primary Care, University of Auckland, Aukland 1020, New Zealand; § Sports Medicine Practice, St. Helen's Hospital, Hobart 7216, Tasmania, Australia; ¶ Department of Cardiology, Children's Hospital, Boston, MA 02115; and ∥ 161 Richdale Road, Colts Neck, NJ 07722
Author_xml – sequence: 1
  fullname: T. D. Noakes
– sequence: 2
  fullname: K. Sharwood
– sequence: 3
  fullname: D. Speedy
– sequence: 4
  fullname: T. Hew
– sequence: 5
  fullname: S. Reid
– sequence: 6
  fullname: J. Dugas
– sequence: 7
  fullname: C. Almond
– sequence: 8
  fullname: P. Wharam
– sequence: 9
  fullname: L. Weschler
– sequence: 10
  givenname: Norman
  surname: Myers
  fullname: Myers, Norman
BackLink https://www.ncbi.nlm.nih.gov/pubmed/16344476$$D View this record in MEDLINE/PubMed
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Conflict of interest statement: No conflicts declared.
Abbreviations: TBW, total body water; EAH, exercise-associated hyponatremia; EAHE, exercise-associated hyponatremic encephalopathy; SIADH, syndrome of inappropriate ADH secretion.
Author contributions: T.D.N., K.S., D.S., T.H., S.R., J.D., C.A., and P.W. designed research; T.D.N., K.S., D.S., T.H., S.R., J.D., C.A., and P.W. performed research; T.D.N., C.A., and L.W. contributed new reagents/analytic tools; and T.D.N., K.S., D.S., T.H., S.R., J.D., C.A., P.W., and L.W. analyzed data and wrote the paper.
Communicated by Norman Myers, University of Oxford, Oxford, United Kingdom, October 26, 2005
To whom correspondence should be addressed at: University of Cape Town/Medical Research Council Research Unit for Exercise Science and Sports Medicine, Department of Human Biology, Sports Science Institute of South Africa, Boundary Road, Newlands, 7700, South Africa. E-mail: tdnoakes@sports.uct.ac.za.
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Snippet To evaluate the role of fluid and Na+ balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na+ concentrations ([Na+]) and in...
To evaluate the role of fluid and Na + balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na + concentrations ([Na + ]) and...
To evaluate the role of fluid and Na + balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na + concentrations ([Na + ]) and...
To evaluate the role of fluid and Na super(+) balance in the development of exercise-associated hyponatremia (EAH), changes in serum Na super(+) concentrations...
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StartPage 18550
SubjectTerms Athletes
Biological Sciences
Body Weight
Body weight changes
Dehydration
Exercise
Exercise - physiology
Fluids
Humans
Hyponatremia
Hyponatremia - blood
Hyponatremia - classification
Hyponatremia - etiology
Hyponatremia - physiopathology
Medical research
Racing
Secretion
Sodium
Sodium - blood
Sports - physiology
Weight gain
Weight loss
Title Three Independent Biological Mechanisms Cause Exercise-Associated Hyponatremia: Evidence from 2,135 Weighed Competitive Athletic Performances
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http://www.pnas.org/content/102/51/18550.abstract
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Volume 102
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