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Beetroot (Beta Vulgaris L.) Extract Acutely Improves Heart Rate Variability Recovery Following Strength Exercise: A
Cicero Jonas R Benjamim1, Francisco Wellington S Júnior2, Maria Íris L S de Figueirêdo2
1Development, Nutrition, Phytotherapy and Hygiene Research Group, University of Pernambuco, Petrolina, PE, Brazil.
Objective:
We assessed the acute effect of beetroot extract intake on cardiovascular and autonomic recovery subsequent to strength exercise.
Methods:
This is a crossover, randomized, double-blind and placebo-controlled trial. We assessed 16 subjects but only 12 healthy male adults completed the two protocols in two randomized days: Beetroot extract (600 mg in capsule) and placebo (600 mg starch in capsule). Beetroot extract or placebo was ingested, the subjects endured 120 minutes seated at rest, followed by a 75% 1RM strength exercise and then remained seated for 60 minutes at rest. Cardiorespiratory parameters, heart rate (HR) variability (HRV) (SDNN, rMSSD, pNN50, SD1, SD2 HF [ms2]) were estimated before, during exercise and during recovery from exercise.
Results:
ingestion of beetroot extract before exercise: accelerates the recovery of SBP following physical effort; improves HR recovery to baseline resting levels (beetroot protocol: change in ∼62% vs. placebo protocol: change in ∼80%), and intensifies the return of vagal HR control during recovery after exercise.
Conclusions:
Beetroot extract acutely improved cardiovascular and autonomic recovery after exercise.
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