Medicine and Health Sciences Commons^™

Bone: An Acute Buffer Of Plasma Sodium During Exhaustive Exercise?, Tamara Hew-Butler, Kristin J. Stuempfle, Martin D. Hoffman

Health Sciences Faculty Publications

Both hyponatremia and osteopenia separately have been well documented in endurance athletes. Although bone has been shown to act as a “sodium reservoir” to buffer severe plasma sodium derangements in animals, recent data have suggested a similar function in humans. We aimed to explore if acute changes in bone mineral content were associated with changes in plasma sodium concentration in runners participating in a 161 km mountain footrace. Eighteen runners were recruited. Runners were tested immediately pre- and post-race for the following main outcome measures: bone mineral content (BMC) and density (BMD) via dual-energy X-ray absorptiometry (DEXA); plasma sodium concentration …

Association Of Gastrointestinal Distress In Ultramarathoners With Race Diet, Kristin J. Stuempfle, Martin D. Hoffman, Tamara Hew-Butler

Health Sciences Faculty Publications

Context: Gastrointestinal (GI) distress is common during ultrarunning.

Purpose: To determine if race diet is related to GI distress in a 161-km ultramarathon.

Methods: Fifteen (10 male, 5 female) consenting runners in the Javelina Jundred (6.5 loops on a desert trail) participated. Body mass was measured immediately pre-race and after each loop. Runners reported if they had nausea, vomiting, abdominal cramps, and/or diarrhea after each loop. Subjects were interviewed after each loop to record food, fluid, and electrolyte consumption. Race diets were analyzed using Nutritionist Pro.

Results: Nine (8 male, 1 female) of 15 runners experienced GI distress including nausea …