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1999 Publications

FOOD AND FLUID INTAKE DURING A 100 MILE TRAIL RUNby C.M. Murphy, B.W. Glace, K. Kolstad, and G.W. Gleim, FACSMNicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, NY 10021, USA. - last modified 2013-02-09 00:00
Med Sci Sports Exer 31(5), s81, 1999


Since energy expenditure for a 100-mile run is estimated to be in excess of 10,000 Kcal we evaluated strategies for meeting these needsby monitoring fluid and food intake during the Vermont 100 miler.

Nineteen runners (45.1 +/- 2.9 yrs) recorded intake 12 hours prerace. Intake data during the run was collected by trained observers at food stations each 8 miles, and by self report. The mean finish time was 24.3 hours. A decrease in body weight was noted, 75.9 +/- 2.3 Kg to 74.4 +/- 2.2 Kg (p<0.001). There was no change in total body water by electrical impedance. The sodium/fluid ratio demonstrates a hypotonic fluid intake.

Intake per mile was greatest between miles 27 amd 55 (p<.001)

Moisture intake far exceeded fluid intakes described in previous studies of ultraendurance athletes (our inclusion of food moisture may account for these differences). Caloric intakes during an 100 mile run were similar to those observed during the Tour de France, despite greater caloric expenditure. Runners in this study did not eat calories sufficient to match their energy expenditure.