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Related Experiment Videos

Nutrient intake of marathon runners.

D C Nieman1, J V Butler, L M Pollett

  • 1Department of Nutrition, School of Public Health, Loma Linda University, California 92350.

Journal of the American Dietetic Association
|September 1, 1989
PubMed
Summary

Marathon runners generally consume better diets than the general population. However, endurance athletes may need professional guidance to ensure adequate caloric and carbohydrate intake for optimal performance.

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Area of Science:

  • Sports Nutrition
  • Exercise Physiology
  • Nutritional Science

Background:

  • Marathon running demands specific nutritional strategies for optimal performance and recovery.
  • Understanding the dietary patterns of endurance athletes is crucial for developing evidence-based recommendations.
  • Previous research indicates potential nutrient gaps in athletes' diets, particularly concerning energy and macronutrient balance.

Purpose of the Study:

  • To analyze the dietary intake of marathon runners and compare it against established nutritional standards.
  • To investigate the relationship between training volume and nutrient intake in this athletic population.
  • To assess runners' perceptions of their dietary quality in relation to their training regimen.

Main Methods:

  • Analysis of three-day food records from a cohort of 291 male and 56 female marathon runners.

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  • Comparison of nutrient intake data against Recommended Dietary Allowances (RDAs) and general U.S. population data.
  • Categorization of runners based on training volume to examine nutrient density variations.

    • Main Results:

    • Runners' nutrient intake generally exceeded two-thirds of RDAs, with exceptions for vitamin D and zinc in women.
    • Marathon runners exhibited higher energy and nutrient intake than the general U.S. population, with specific exceptions (total fat, vitamin B-12, zinc, sodium).
    • Despite generally superior diets, caloric intake and carbohydrate percentage were below recommendations for endurance exercise, and training volume did not correlate with increased nutrient density.

    Conclusions:

    • Regular endurance exercise is associated with improved nutrient intake quantity and quality compared to the general population.
    • Marathon runners may require professional dietary planning to meet energy and carbohydrate needs for endurance activities.
    • Self-perceived dietary improvements post-training suggest a positive behavioral response to exercise, potentially attracting previously sedentary individuals.