Case #1 : Female marathoner, height is 5’5”, weight is 127 lbs. (57.7 kg). She i

Question

Case #1: Female marathoner, height is 5’5”, weight is 127 lbs. (57.7 kg). She is training for her third marathon and looking to beat her PR of 3:30 (needing an average 8 min. per mile pace).

Training: She runs 60-70 miles per week. Runs: Tuesday-Sunday. Sunday is long run day (between 18-20 miles) and Monday is a day off. Her weight following long training runs is 124 lbs.

Diet: Consumes 2000 kcals/d, 1.6 g/kg/d protein, 228 g CHO with meals. In addition, one hour before her long run she consumes 2 cups of Gatorade Thirst Quencher and then consumes another 2 cups of Gatorade Thirst Quencher during her long run.

After completing her long run she does 20 min. of core work, then stretches for 15-20 min. during which she drinks 2 cups of water. She starts making her recovery meal at ~60 minutes after completing her long run.

Challenge: Her most recent Sunday run was 18 miles. Her time for this run was much slower (8.5 min per mile) total time was 2 hrs and 33 min. In addition, though she takes Monday off, over the last three weeks her training runs during the first part of the week have been feeling harder, resulting in the need to take an additional day off.

Use this case information to answer the following questions.

Case #1: Based on Sunday Long Run day What is her current total daily intake of carbohydrate per kilogram body weight?

230 g/d

4.9 g/kg/d

~4.0 g/kg/d

45% CHO

Explanation / Answer

1) The weight of the female marathoner is 57.7 kg. She takes 228 grams of carbohydrate with meals. Therefore, her current total daily intake of carbohydrate per kilogram body weight is,

= 228/57.7

= 3.95 g/kg/day

Approximately 4.0 g/kg/d

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