INVESTIGATING THE HYDRATION STATUS, METABOLIC RESPONSES AND COGNITIVE-MOTOR PERFORMANCE IN CYCLISTS UNDER HEAT STRESS

Autores

  • Edla A Herculano Chemistry and Biotechnology Institute, Federal University of Alagoas, Maceió, Brazil
  • Luis Fernando Sousa Filho Universidade Federal de Sergipe http://orcid.org/0000-0001-7308-0548
  • Rosemeire D de Almeida Federal University of Sergipe, São Cristovão, Sergipe, Brazil
  • Thassia C L França Laboratory for Research in Physical Exercise and Metabolism; Physical Education, Federal University of Alagoas, Maceió, Brazil; Graduate Program in Nutrition; Federal University of Alagoas, Maceió, Brazil.
  • Natally M de Oliveira Laboratory for Research in Physical Exercise and Metabolism; Physical Education, Federal University of Alagoas, Maceió, Brazil; Graduate Program in Nutrition; Federal University of Alagoas, Maceió, Brazil.
  • Saulo RAS Camerino Laboratory for Research in Physical Exercise and Metabolism; Physical Education, Federal University of Alagoas, Maceió, Brazil; Graduate Program in Nutrition; Federal University of Alagoas, Maceió, Brazil.
  • Rafaela C P Lima Laboratory for Research in Physical Exercise and Metabolism; Physical Education, Federal University of Alagoas, Maceió, Brazil
  • Eduardo S Prado Laboratory for Research in Physical Exercise and Metabolism; Physical Education, Federal University of Alagoas, Maceió, Brazil; Graduate Program in Nutrition; Federal University of Alagoas, Maceió, Brazil.

DOI:

https://doi.org/10.31501/rbcm.v27i2.9348

Resumo

The aim of this study was to evaluate the hydration status, metabolic responses and cognitive-motor performance during a combined cycling race in the heat. The combined cycling race (such as a simulated cycling race), consisted of 67 km under heat stress conditions. Before and after cycling race, ten male cyclists (30.5 ± 4.9 years) were evaluated for hydration status, biochemical and hematological parameters and cognitive-motor performance. Blood samples were collected for biochemical and hematological analysis. The hydration status was assessed by evaluating a change in body mass percentage loss (?% BM), urinary color, specific gravity and blood parameters. To evaluate cognitive-motor performance, we measured immediate memory, motor coordination and reaction time. Environmental conditions during exercise were an average of 27.1 ± 0.7 °C for Wet-Bulb Globe Temperature (WBGT) Index. The hydration status (?% BM: - 3.26 ± 0.57), demonstrated that the cyclists were dehydrated after race. We found an increase in the concentrations of ammonia (?%: 74.94 ± 18.64) and its metabolites (urea and urate) after the race. The concentrations of blood glucose and lactate were not significantly different after the race. Exercise promoted a significant increase in enzyme biomarkers for muscle damage. Red blood cells counts were unchanged. However, leukocyte count (?%: 178.55 ± 28.64) increased significantly. No changes were observed in the cognitive-motor tasks. Under these conditions, the results of the present study indicate that dehydration and/or hyperammonemia does not negatively affect cognitive-motor performance in acclimated cyclists.

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Publicado

2019-06-12

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