PMID: 18712227Aug 21, 2008Paper

Physical risks whilst walking the Nijmegen Four Days Marches in 2007: electrolyte imbalance in 1 in 5 walkers

Nederlands tijdschrift voor geneeskunde
T M H EijsvogelsM T E Hopman

Abstract

To determine the physiological impact and health risks for walkers during the Nijmegen (the Netherlands) Four Days Marches in 2007, the largest walking event in the world with more than 45,000 participants. Observational study. 66 volunteers were randomly selected and counterbalanced for distance walked and gender in this observational study. Subjects walked 30 km (n = 20; 10 men), 40 km (n = 25; 14 men) or 50 km (n = 21; 10 men) per day, for 4 consecutive days. Core body temperature, fluid intake, changes in body weight, plasma sodium concentrations and energy usage were measured before and after the marches. During this event, ambient temperatures ranged from 11.0 degrees C to a maximum 25.4 degrees C expressed as 'wet bulb globe temperature' (WBGT). Heart rate (+38 beats per minute) and core body temperature (+0.8 degree C) significantly increased in all subjects during each day (about 9 hours walking per day at an average of 4.6 km/h), but hyperthermia was not diagnosed (definition: > 39.0 degrees C). Average fluid intake varied between 2.6 and 3.3 l/d with a range of 0.3-12 l/d. The relative change in body weight associated with this was -3.1 to +4.3%. Mean plasma sodium concentration decreased from 142.4 to 140.6 mmol/l o...Continue Reading

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