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The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling

Author

Listed:
  • Francesco Campa

    (Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy
    Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy)

  • Alessandro Piras

    (Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy)

  • Milena Raffi

    (Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy)

  • Aurelio Trofè

    (Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy)

  • Monica Perazzolo

    (Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy)

  • Gabriele Mascherini

    (Department of Experimental and Clinical Medicine, University of Florence, AOUC, 50139 Careggi, Florence, Italy)

  • Stefania Toselli

    (Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy)

Abstract

This study aimed to determine the effects of dehydration on metabolic and neuromuscular functionality performance during a cycling exercise. Ten male subjects (age 23.4 ± 2.7 years; body weight 74.6 ± 10.4 kg; height 177.3 ± 4.6 cm) cycled at 65% VO 2max for 60 min followed by a time-to-trial (TT) at 95% VO 2max , in two different conditions: dehydration (DEH) and hydration (HYD). The bioelectrical impedance vector analysis (BIVA) and body weight measurements were performed to assess body fluid changes. Heart rate (HR), energy cost, minute ventilation, oxygen uptake, and metabolic power were evaluated during the experiments. In addition, neuromuscular activity of the vastus medialis and biceps femoris muscles were assessed by surface electromyography. After exercise induced dehydration, the bioimpedance vector significantly lengthens along the major axis of the BIVA graph, in conformity with the body weight change (−2%), that indicates a fluid loss. Metabolic and neuromuscular parameters significantly increased during TT at 95% VO 2max with respect to constant workload at 65% of VO 2max . Dehydration during a one-hour cycling test and subsequent TT caused a significant increase in HR, while neuromuscular function showed a lower muscle activation in dehydration conditions on both constant workload and on TT. Furthermore, a significant difference between HYD and DEH for TT duration was found.

Suggested Citation

  • Francesco Campa & Alessandro Piras & Milena Raffi & Aurelio Trofè & Monica Perazzolo & Gabriele Mascherini & Stefania Toselli, 2020. "The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling," IJERPH, MDPI, vol. 17(4), pages 1-10, February.
    • Handle: RePEc:gam:jijerp:v:17:y:2020:i:4:p:1161-:d:319853
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    References listed on IDEAS

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    1. Stefania Toselli & Elisabetta Marini & Pasqualino Maietta Latessa & Luca Benedetti & Francesco Campa, 2020. "Maturity Related Differences in Body Composition Assessed by Classic and Specific Bioimpedance Vector Analysis among Male Elite Youth Soccer Players," IJERPH, MDPI, vol. 17(3), pages 1-10, January.
    2. Ruben Francisco & Catarina N. Matias & Diana A. Santos & Francesco Campa & Claudia S. Minderico & Paulo Rocha & Steven B. Heymsfield & Henry Lukaski & Luís B. Sardinha & Analiza M. Silva, 2020. "The Predictive Role of Raw Bioelectrical Impedance Parameters in Water Compartments and Fluid Distribution Assessed by Dilution Techniques in Athletes," IJERPH, MDPI, vol. 17(3), pages 1-14, January.
    3. Francesco Campa & Catarina Matias & Hannes Gatterer & Stefania Toselli & Josely C. Koury & Angela Andreoli & Giovanni Melchiorri & Luis B. Sardinha & Analiza M. Silva, 2019. "Classic Bioelectrical Impedance Vector Reference Values for Assessing Body Composition in Male and Female Athletes," IJERPH, MDPI, vol. 16(24), pages 1-12, December.
    4. Francesco Campa & Analiza Monica Silva & Vincenzo Iannuzzi & Gabriele Mascherini & Luca Benedetti & Stefania Toselli, 2019. "The Role of Somatic Maturation on Bioimpedance Patterns and Body Composition in Male Elite Youth Soccer Players," IJERPH, MDPI, vol. 16(23), pages 1-11, November.
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    Cited by:

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