Water Intake Accelerates Parasympathetic Reactivation After High-Intensity Exercise

• Autores: Tiago Pecanha, Marcelle Paula-Ribeiro, Edson Campana-Rezende, Rhenan Bartels, Joao Carlos Bouzas Marins, Jorge Roberto De Lima Perrout
• Localización: International journal of sport nutrition and exercise metabolism, ISSN 1526-484X, ISSN-e 1543-2742, Vol. 24, Nº. 5, 2014, págs. 489-496
• Idioma: inglés
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• Resumen

  • It has been shown that water intake (WI) improves postexercise parasympathetic recovery after moderate- intensity exercise session. However, the potential cardiovascular benefit promoted by WI has not been investigated after high-intensity exercise. Purpose: To assess the effects of WI on post high-intensity parasympathetic recovery. Methods: Twelve recreationally active young men participated in the study (22 ± 1.4 years, 24.1 ± 1.6 kg.m�2). The experimental protocol consisted of two visits to the laboratory. Each visit consisted in the completion of a 30-min high-intensity [~80% of maximal heart rate (HR)] cycle ergometer aerobic session performing randomly the WI or control (CON, no water consumption) intervention at the end of the exercise. HR and RR intervals (RRi) were continuously recorded by a heart rate monitor before, during and after the exercise. Differences in HR recovery [e.g., absolute heart rate decrement after 1 min of recovery (HRR60s) and time-constant of the first order exponential fitting curve of the HRR (HRR?)] and in postexercise vagal- related heart rate variability (HRV) indexes (rMSSD30s, rMSSD, pNN50, SD1 and HF) were calculated and compared for WI and CON. Results: A similar HR recovery and an increased postexercise HRV [SD1 = 9.4 ± 5.9 vs. 6.0 ± 3.9 millisecond, HF(ln) = 3.6 ± 1.4 vs. 2.4 ± 1.3 millisecond2, for WI and CON, respectively; p < .05] was observed in WI compared with CON. Conclusion: The results suggest that WI accelerates the postexercise parasympathetic reactivation after high-intensity exercise. Such outcome reveals an important cardioprotective effect of WI.