Food restriction alters salivary cortisol and α-amylase responses to a simulated weightlifting competition without significant performance modification.
J Sports Sci
; 36(5): 536-544, 2018 Mar.
Article
em En
| MEDLINE
| ID: mdl-28475465
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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Texto completo:
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Base de dados:
MEDLINE
Assunto principal:
Saliva
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Levantamento de Peso
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Hidrocortisona
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Comportamento Competitivo
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Restrição Calórica
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Alfa-Amilases
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Desempenho Atlético
Idioma:
En
Ano de publicação:
2018
Tipo de documento:
Article