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Dietary Tendencies as Predictors of Marathon Time in Novice Marathoners.
MedLine Citation:
PMID:  23070826     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
BACKGROUND: The effects of dietary factors such as carbohydrate on endurance running performance have been extensively studied under laboratory-based and simulated field conditions. Evidence from 'real-life' events, however, is poorly characterized. The purpose of this observational study was to examine the associations between pre-race and in-race nutrition tendencies and performance in a sample of novice marathoners. METHODS: Forty-six college students (36 women and 10 men) aged 21.3 ± 3.3 yrs recorded diet for 3-days prior to, the morning of, and during a 26.2-mile marathon. Anthropometric, physiological, and performance measurements were assessed prior to the marathon so the associations between diet and marathon time could be included as part of a stepwise regression model. RESULTS: Mean marathon time was 266 ± 42 minutes. A pre-marathon 2-mile time trial explained 73% of the variability in marathon time (adjusted R2 = 0.73, p < 0.001). Day before + morning of carbohydrate (DBMC) was the only other significant predictor of marathon time, explaining an additional 4% of the variability in marathon time (adjusted R2 = 0.77, p = 0.006). Other factors such as age, BMI, gender, day before + morning of energy, and in-race carbohydrate were not significant independent predictors of marathon time. CONCLUSIONS: In this sample of primarily novice marathoners, DBMC intake was associated with faster marathon time, independent of other known predictors. These results suggest that novice and recreational marathoners should consider consuming a moderate-to-high amount of carbohydrate in the 24-36 hours prior to a marathon.
Authors:
Patrick B Wilson; Stacy J Ingraham; Chris Lundstrom; Gregory Rhodes
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-11
Journal Detail:
Title:  International journal of sport nutrition and exercise metabolism     Volume:  -     ISSN:  1543-2742     ISO Abbreviation:  Int J Sport Nutr Exerc Metab     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-16     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100939812     Medline TA:  Int J Sport Nutr Exerc Metab     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
School of Kinesiology, University of Minnesota, Minneapolis, MN.
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