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Muscle Cramping During A 161-Km Ultramarathon: Comparison Of Characteristics Of Those With And Without Cramping, Martin D. Hoffman, Kristin J. Stuempfle
Muscle Cramping During A 161-Km Ultramarathon: Comparison Of Characteristics Of Those With And Without Cramping, Martin D. Hoffman, Kristin J. Stuempfle
Health Sciences Faculty Publications
Background: This work sought to identify characteristics differing between those with and without muscle cramping during a 161-km ultramarathon.
Methods: In this observational study, race participants underwent body weight measurements before, during, and after the race; completed a post-race questionnaire about muscle cramping and “near” cramping (controllable, not reaching full-blown cramping), drinking strategies, and use of sodium supplementation during four race segments; and underwent a post-race blood draw for determination of serum sodium and blood creatine kinase (CK) concentrations.
Results: The post-race questionnaire was completed by 280 (74.5 %) of the 376 starters. A post-race blood sample was provided by …
Hyponatremia In The 2009 161-Km Western States Endurance Run, Martin D. Hoffman, Kristin J. Stuempfle, Ian R. Rogers, Louise B. Weschler, Tamara Hew-Butler
Hyponatremia In The 2009 161-Km Western States Endurance Run, Martin D. Hoffman, Kristin J. Stuempfle, Ian R. Rogers, Louise B. Weschler, Tamara Hew-Butler
Health Sciences Faculty Publications
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+] /L. Postrace [Na+ …