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KMID : 1101420160480020137
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Korean Journal of Clinical Laboratory Science
2016 Volume.48 No. 2 p.137 ~ p.143
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Safety Assessment of Osmolality Concentration and Biochemical Factors Changes in Electrolyte Metabolism during an Ultra-marathon (100 km)
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Shin Kyung-Ah
Kim Young-Joo
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Abstract
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This study was conducted to investigate the electrolyte metabolic responses to a 100 km ultra-marathon in 22 male amateur runners. Their average age was 50.91±4.77 years old and their VO2max value was 48.19±6.43 mL/kg/min. The participants completed the race with a mean finishing time of 205.55±19.61 minute. Electrolyte parameters based on blood tests including calcium, inorganic phosphorus, magnesium, sodium, potassium, chloride, total carbon dioxide, anion gap, plasma volume change and osmolality were measured pre-race, at 50 km, and at 100 km (post-race). Only slight changes in sodium level with no cases of hypernatremia or hyponatremia were observed. Additionally, all the electrolyte parameters changes were within the normal range and plasma volumes were unchanged. Overall, amateur marathon runners are not at risk to develop clinically significant electrolyte or osmolality changes during a 100 km ultra-marathon.
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KEYWORD
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Electrolyte, Endurance exercise, Osmolality, Plasma volume change
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