PURPOSE: To determine the incidence of exercise-associated hyponatremia (EAH), the associated biochemical measurements and risk factors for EAH, and whether there is an association between postrace blood sodium concentration ([Na+]) and changes in body mass among participants in the 2009 Western States Endurance Run, a 161-km mountain trail run. METHODS: Change in body mass, postrace [Na+], and blood creatine phosphokinase (CPK) concentration, and selected runner characteristics were evaluated among consenting competitors. RESULTS: Of the 47 study participants, 14 (30%) had EAH as defined by a postrace [Na+] <135 mmol/L. Postrace [Na+] and percent change in body mass were directly related (r = .30, P = .044), and 50% of those with EAH had body mass losses of 3-6%. EAH was unrelated to age, sex, finish time, or use of nonsteroidal anti-inflammatory drugs during the run, but those with EAH had completed a smaller (P = .03) number of 161-km ultramarathons. The relationship of CPK levels to postrace [Na+] did not reach statistical significance (r = -.25, P = .097). CONCLUSIONS: EAH was common (30%) among finishers of this 161-km ultramarathon and it was not unusual for those with EAH to be dehydrated. As such, changes in body mass should not be relied upon in the assessment for EAH during 161-km ultramarathons.
PURPOSE: To determine the incidence of exercise-associated hyponatremia (EAH), the associated biochemical measurements and risk factors for EAH, and whether there is an association between postrace blood sodium concentration ([Na+]) and changes in body mass among participants in the 2009 Western States Endurance Run, a 161-km mountain trail run. METHODS: Change in body mass, postrace [Na+], and blood creatine phosphokinase (CPK) concentration, and selected runner characteristics were evaluated among consenting competitors. RESULTS: Of the 47 study participants, 14 (30%) had EAH as defined by a postrace [Na+] <135 mmol/L. Postrace [Na+] and percent change in body mass were directly related (r = .30, P = .044), and 50% of those with EAH had body mass losses of 3-6%. EAH was unrelated to age, sex, finish time, or use of nonsteroidal anti-inflammatory drugs during the run, but those with EAH had completed a smaller (P = .03) number of 161-km ultramarathons. The relationship of CPK levels to postrace [Na+] did not reach statistical significance (r = -.25, P = .097). CONCLUSIONS:EAH was common (30%) among finishers of this 161-km ultramarathon and it was not unusual for those with EAH to be dehydrated. As such, changes in body mass should not be relied upon in the assessment for EAH during 161-km ultramarathons.
Authors: Douglas J Casa; Kevin M Guskiewicz; Scott A Anderson; Ronald W Courson; Jonathan F Heck; Carolyn C Jimenez; Brendon P McDermott; Michael G Miller; Rebecca L Stearns; Erik E Swartz; Katie M Walsh Journal: J Athl Train Date: 2012 Jan-Feb Impact factor: 2.860
Authors: Martin D Hoffman; Andy Pasternak; Ian R Rogers; Morteza Khodaee; John C Hill; David A Townes; Bernd Volker Scheer; Brian J Krabak; Patrick Basset; Grant S Lipman Journal: Sports Med Date: 2014-08 Impact factor: 11.136
Authors: Desmond Wei Tan; Si Hui Yap; Mingchang Wang; Priscilla Weiping Fan; Ya Shi Teo; Priathashini Krishnasamy; Lingaraj Krishna; Tamara Hew-Butler; Jason Kai Wei Lee Journal: Sports Med Open Date: 2016-07-19