This study was a randomized, double-blind, crossover design for 3 weeks. In the first week, a researcher explained all the experimental procedures to the participants. In the following two weeks, the participants attended the Exercise Physiology laboratory to be assessed in 2 rowing ergometer sessions, separated from each other by a washout period of 7 days, under the same environmental conditions. In both strictly identical sessions, the participants randomly ingested beetroot juice (BRJ) or placebo (PL) 3 hours before the start of the tests.
Three hours after BRJ or PL intake, the participants began the 2,000-meter rowing ergometer test. Before starting (pretest) and at the end of the tests (posttest), blood oxygen saturation, rating of perceived exertion (RPE), and blood lactate measurements were taken. During the rowing ergometer tests, performance parameters and cardiorespiratory variables were recorded.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
TRIPLE
Enrollment
10
Beetroot juice ingestion was randomly administered 3 h before the start of the test to the participants in two assessment sessions with a one-week washout between both sessions.
Placebo ingestion was randomly administered 3 h before the start of the test to the participants in two assessment sessions with a one-week washout between both sessions.
Campus Docent Sant Joan de Déu. Universitat de Barcelona
Sant Boi de Llobregat, Barcelona, Spain
Rowing performance: Time trial
minutes:seconds (mm:ss)
Time frame: through study completion, an average of 3 weeks
Rowing performance: Mean Power output
Watts
Time frame: through study completion, an average of 3 weeks
Rowing performance: meter per stroke
Meters
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: absolute oxygen uptake
V̇O2max (L/min)
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: relative oxygen uptake
V̇O2max (mL/kg/min)
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: ventilatory efficiency
slope of Ventilation/Carbon dioxide production
Time frame: through study completion, an average of 3 weeks
Metabolic performance: lactate
mmol/L
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: Maximum heart rate
beats/min
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: Mean heart rate
beats/min
Time frame: through study completion, an average of 3 weeks
Saturation
percentage
Time frame: through study completion, an average of 3 weeks
Cardiorespiratory performance: minute ventilation
minute ventilation in L/min
Time frame: through study completion, an average of 3 weeks
Scale of Perceived exertion ratio (RPE)
Scale from 0 to 10. 0 = rest; 10 = maximum effort
Time frame: through study completion, an average of 3 weeks
Rowing performance: strokes
Mean strokes per minute
Time frame: through study completion, an average of 3 weeks
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