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European Journal of Applied Physiology

, Volume 100, Issue 1, pp 27–33 | Cite as

Protein requirements in male adolescent soccer players

  • N. BoisseauEmail author
  • M. Vermorel
  • M. Rance
  • P. Duché
  • P. Patureau-Mirand
Original Article

Abstract

Few investigations have studied protein metabolism in children and adolescent athletes which makes difficult the assessment of daily recommended dietary protein allowances in this population. The problematic in paediatric competitors is the determination of additional protein needs resulting from intensive physical training. The aim of this investigation was to determine protein requirement in 14-year-old male adolescent soccer players. Healthy male adolescent soccer players (N = 11, 13.8 ± 0.1 year) participated in a short term repeated nitrogen balance study. Diets were designed to provide proteins at three levels: 1.4, 1.2 and 1.0 g protein per kg body weight (BW). Nutrient and energy intakes were assessed from 4 day food records corresponding to 4 day training periods during 3 weeks. Urine was collected during four consecutive days and analysed for nitrogen. The nitrogen balances were calculated from mean daily protein intake, mean urinary nitrogen excretion and estimated faecal and integumental nitrogen losses. Nitrogen balance increased with both protein intake and energy balance. At energy equilibrium, the daily protein intake needed to balance nitrogen losses was 1.04 g kg−1 day−1. This corresponds to an estimated average requirement (EAR) for protein of 1.20 g kg−1 day−1 and a recommended daily allowance (RDA) of 1.40 g kg−1 day−1 assuming a daily nitrogen deposition of 11 mg kg−1. The results of the present study suggest that the protein requirements of 14-year-old male athletes are above the RDA for non-active male adolescents.

Keywords

Protein allowances Adolescent athletes Growth Nutrition 

Notes

Acknowledgments

The authors wish to thank Bernard Grunwald, Manager and Francis Desmettre, Assistant Manager at the Vichy Sport Center for their warm welcome, Madam Curtil for the logistic of the study, Aurélie Bodin, dietician, the cooks and the nurse for their very professional help and their kindness and, above all, the volunteers and their coach, Alain Ollier, for their patience, time and effort.

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Copyright information

© Springer-Verlag 2007

Authors and Affiliations

  • N. Boisseau
    • 1
    Email author
  • M. Vermorel
    • 2
  • M. Rance
    • 3
  • P. Duché
    • 3
  • P. Patureau-Mirand
    • 4
  1. 1.Laboratoire des Adaptations Physiologiques aux Activités Physiques (LAPHAP)EA 3813, Faculté des Sciences du SportPoitiersFrance
  2. 2.INRA, Unité de Recherches « Métabolismes énergétique et lipidique »Centre de Clermont Ferrand/Theix, CRNH d’AuvergneClermont FerrandFrance
  3. 3.Laboratoire de Biologie des Activités Physiques et SportivesUniversité Blaise Pascal, UFR STAPSAubière CedexFrance
  4. 4.INRA, UMR1019, Unité Nutrition HumaineCentre de Clermont Ferrand Theix, CRNH d’AuvergneClermont FerrandFrance

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