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This study examined the nutritional and performance status of elite soccer players during intense training. Eight male players (age 17 ± 2 years) of the Puerto Rican Olympic Team recorded daily activities and food intake over 12 days. Daily energy expenditure was 3,833 ± 571 (SD) kcal, and energy intake was 3,952 ± 1,071 kcal, of which 53.2 ± 6.2% (8.3 g ⋅ kg BW−1) was from carbohydrates (CHO), 32.4 ± 4.0% from fat, and 14.4 ± 2.3% from protein. With the exception of calcium, all micronutrients examined were in accordance with dietary guidelines. Body fat was 7.6 ± 1.1% of body weight. Time to completion of three runs of the soccer-specific test was 37.65 ± 0.62 s, and peak torques of the knee flexors and extensors at 60° ⋅ s−1 were 139 ± 6 and 225 ± 9 N ⋅ m, respectively. Players' absolute amounts of CHO seemed to be above the minimum recommended intake to maximize glycogen storage, but calcium intakes were below recommended. Their body fat was unremarkable, and they had a comparatively good capacity to endure repeated bouts of intense soccer-specific exercise and to exert force with their knee extensors and flexors.

J. Rico-Sanz was with the Department of Exercise Science. University of California, Davis, at the lime of thesludy and is now with Lhe Department of Biochemistry and Molecular Biology. University Autonoma of Barcelona, 08193 Bellaterra, Barcelona, Spain. W.R. Froniera was wiih the Center for Sports Healih and Exercise Sciences, Albergue Olimpico, University of Puerto Rico, and is now at the Department of Physical Medicine and Rehabilitation. Harvard Medical School, and Spaulding Rehabilitation Hospital. Boston, MA 02114. P.A. Molé is with Department of Exercise Science, University of California. Davis. CA 95616. M. A. Rivera was with lhe Center for Sporis Health and Exercise Sciences, Albergue Olimpico, University of Puerto Rico, and is now with the Department of Physical Medicine. Rehabilitation and Sports Medicine, University of Puerto Rico Medical School A. Rivera-Brown is with the Center for Sports Healih and Exercise Sciences, Albergue Olimpico, University of Puerto Rico. C.N. Meredith was with the Department of Clinical Nutrition, University of California. Davis, and is now with the Department of Exercise Science, University of California, Davis.

International Journal of Sport Nutrition and Exercise Metabolism