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Table 2 Estimated daily caloric requirements for ultra-marathon runners, based on sex, typical extremes of body mass/fat, and session duration/pace

From: International Society of Sports Nutrition Position Stand: nutritional considerations for single-stage ultra-marathon training and racing

PACEFEMALEMALE
50 kg (15% BF)70 kg (24% BF)65 kg (10% BF)85 kg (20% BF)
 1 h3 h1 h3 h1 h3 h1 h3 h
11.5 min·mile− 1 (8.4 km·h− 1)20042726244334552553349229594187
9 min·mile−1 (10.7 km·h− 1)21033023258138702681387831274692
7 min·mile−1 (13.8 km·h− 1)22363423276844302855439833545372
  1. e.g., a female runner of body mass 50 kg (~ 15% body fat), training for 1 h per day at a pace of 9 min·mile− 1, would need an estimated 2103 Kcal·d− 1. BF body fat. h hour