Contributors: [Jurado-Castro, Jose Manuel] Univ Cordoba, Reina Sofia Univ Hosp, Maimonides Biomed Res Inst Cordoba IMIB, Metab & Invest Unit, Cordoba 14004, Spain; [Jurado-Castro, Jose Manuel] Inst Salud Carlos III, CIBER Fisiopatol Obes & Nutr CIBEROBN, Madrid 28029, Spain; [Llorente-Cantarero, Francisco Jesus] Inst Salud Carlos III, CIBER Fisiopatol Obes & Nutr CIBEROBN, Madrid 28029, Spain; [Jurado-Castro, Jose Manuel] Univ Seville, Escuela Univ Osuna, Ciencias Act Fis & Deporte, Osuna 41640, Spain; [Casanova-Rodriguez, David] Univ Cordoba, Fac Med & Nursing, Dept Nursing Pharmacol & Physiotherapy, Cordoba 14071, Spain; [De La Florida-Villagran, Candelaria Alonso] Univ Cordoba, Fac Med & Nursing, Dept Nursing Pharmacol & Physiotherapy, Cordoba 14071, Spain; [Diaz-Bernier, Victor Manuel] Univ Cordoba, Fac Med & Nursing, Dept Nursing Pharmacol & Physiotherapy, Cordoba 14071, Spain; [Ranchal-Sanchez, Antonio] Univ Cordoba, Fac Med & Nursing, Dept Nursing Pharmacol & Physiotherapy, Cordoba 14071, Spain; [Campos-Perez, Julian] Univ Cordoba, Dept Food Sci & Technol, Campus Univ Rabanales, Cordoba 14004, Spain; [Llorente-Cantarero, Francisco Jesus] Univ Cordoba, Fac Educ, Dept Specif Didact, Cordoba 14004, Spain; [Ranchal-Sanchez, Antonio] Univ Cordoba, Reina Sofia Univ Hosp, Maimonides Biomed Res Inst Cordoba IMIB, Grp Invest Clin Epidemiol Atenc Primaria, Cordoba 14004, Spain; Departamento de Enfermeria, Farmacologia y Fisioterapia (Facultad de Medicina y Enfermeria, Universidad de Cordoba)
نبذة مختصرة : Beetroot juice (BJ) has been used as a sport supplement, improving performance in resistance training (RT). However, its effect on the modulation of the autonomic nervous system has not yet been widely studied. Therefore, the objective of this randomized double-blind crossover study was to assess the effect of acute BJ supplementation compared to placebo in blood pressure (BP), heart rate (HR), heart rate variability (HRV) and internal load during RT measure as Root Mean Square of the Successive Differences between adjacent RR intervals Slope (RMSSD and RMSSD-Slope, respectively). Eleven men performed an incremental RT test (three sets at 60%, 70% and 80% of their repetition maximum) composed by back squat and bench press with. HR, HRV and RMSSD-Slope were measured during and post exercise. As the main results, RMSSD during exercise decrease in the BJ group compared to placebo (p = 0.023; ES = 0.999), there were no differences in RMSSD post-exercise, and there were differences in RMSSD-Slope between groups in favor of the BJ group (p = 0.025; ES = 1.104) with a lower internal load. In conclusion, BJ supplementation seems to be a valuable tool for the reduction in the internal load of exercise during RT measured as RMSSD-Slope while enhancing performance.
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