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Food restriction alters salivary cortisol and α-amylase responses to a simulated weightlifting competition without significant performance modification.

Authors
  • Durguerian, Alexandre1, 2
  • Filaire, Edith1, 2, 3
  • Drogou, Catherine4, 5
  • Bougard, Clément4, 5
  • Chennaoui, Mounir4, 5
  • 1 a CIAMS , Université Paris-Sud, Université Paris-Saclay , Orsay Cedex , France. , (France)
  • 2 b CIAMS , Université d'Orléans , Orléans , France. , (France)
  • 3 c Equipe ECRIN, CLARA, CRNH Auvergne , INRA, UMR, UNH, CRNH Auvergne , Clermont-Ferrand , France. , (France)
  • 4 d Institut de Recherche Biomédicale des Armées , Unité Fatigue et Vigilance , Brétigny-sur-Orge , France. , (France)
  • 5 e Université Paris Descartes, VIFASOM EA 7330, Sorbonne Paris Cité , Paris , France. , (France)
Type
Published Article
Journal
Journal of Sports Sciences
Publisher
Informa UK (Taylor & Francis)
Publication Date
Mar 01, 2018
Volume
36
Issue
5
Pages
536–544
Identifiers
DOI: 10.1080/02640414.2017.1322708
PMID: 28475465
Source
Medline
Keywords
License
Unknown

Abstract

The aim of this investigation was to evaluate the effect of a 6-day food restriction period on the physiological responses and performance of 11 high-level weightlifters. After a period of weight maintenance (T2), they were assigned into two groups depending on whether they lost (Diet group, n = 6) or maintained their body weight (Control group, n = 5) during the course of those 6 days. An evaluation of performance and the measurement of salivary cortisol concentrations and salivary α-amylase (sAA) activity were performed during a simulated weightlifting competition which took place at T2, after a 6-day period of food restriction (T3). Dietary data were collected using a 6-day diet record. We noted a 41.8% decrease in mean energy intake during the dietary restriction period, leading to a 4.34% weight loss for the Diet group. Dietary restriction did not modify absolute performance levels, whilst a significant improvement was noted for the Control group. Furthermore, we noted a response of decreased salivary cortisol and increased sAA activity to the simulated competition stress at T3 for the Diet group. These results may indicate that dietary reduction led to a dissociation of the hypothalamo-pituitary-adrenal axis and the sympatho-adreno-medullary system, which could impair training adaptations and absolute performance development.

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