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Open AccessArticle

The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling

1
Department for Life Quality Studies, University of Bologna, 47921 Rimini, Italy
2
Department of Biomedical and Neuromotor Sciences, University of Bologna, 40126 Bologna, Italy
3
Department of Experimental and Clinical Medicine, University of Florence, AOUC, 50139 Careggi, Florence, Italy
*
Author to whom correspondence should be addressed.
Int. J. Environ. Res. Public Health 2020, 17(4), 1161; https://doi.org/10.3390/ijerph17041161
Received: 14 January 2020 / Revised: 6 February 2020 / Accepted: 10 February 2020 / Published: 12 February 2020
(This article belongs to the Special Issue Body Composition and Physical Health in Sports Practice)
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% VO2max for 60 min followed by a time-to-trial (TT) at 95% VO2max, 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% VO2max with respect to constant workload at 65% of VO2max. 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. View Full-Text
Keywords: bioimpedance; BIVA; body composition; hydration status; phase angle; vector length bioimpedance; BIVA; body composition; hydration status; phase angle; vector length
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MDPI and ACS Style

Campa, F.; Piras, A.; Raffi, M.; Trofè, A.; Perazzolo, M.; Mascherini, G.; Toselli, S. The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling. Int. J. Environ. Res. Public Health 2020, 17, 1161. https://doi.org/10.3390/ijerph17041161

AMA Style

Campa F, Piras A, Raffi M, Trofè A, Perazzolo M, Mascherini G, Toselli S. The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling. International Journal of Environmental Research and Public Health. 2020; 17(4):1161. https://doi.org/10.3390/ijerph17041161

Chicago/Turabian Style

Campa, Francesco; Piras, Alessandro; Raffi, Milena; Trofè, Aurelio; Perazzolo, Monica; Mascherini, Gabriele; Toselli, Stefania. 2020. "The Effects of Dehydration on Metabolic and Neuromuscular Functionality during Cycling" Int. J. Environ. Res. Public Health 17, no. 4: 1161. https://doi.org/10.3390/ijerph17041161

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