No significant differences were found in macronutrient intake between finishers ( n=36) and non-finishers ( n=11). Relative macronutrient intake (% of diet) did not predict finish time (R 2 =0.145, P =0.155). kg -1) predicted finish time (R 2 = 0.232, P =0.036), however fat was the only significant covariate ( t = -2.90, P =0.007).Dietary intake was varied among participants mean carbohydrate intake (5.19☒.62 g To determine differences in macronutrient intake between finishers and non-finishers, two-sample t-tests were used. Multiple linear regression was used to predict finish time with covariates carbohydrate, fat and protein, expressed relative to body weight (g ( N = 47) completed a diet and training questionnaire, and a web-based 24-hour dietary recall on three separate days within 1-4 weeks prior to a 161-km race. To assess habitual diet, runners recruited from five 161-km ultra-marathons across the U.S. The aim of this investigation was to empirically describe the habitual training diet of ultra-marathon runners and determine if macronutrient intake was associated with 161-km race performance. Ultra-marathons (footraces greater than 42.2 km) are increasing in popularity, however little is known about the habitual dietary intake of these runners.
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