Objective: To investigate whether an acute intake of beet juice (BJ) improved the factors of total and split times (performance), stroke frequency and CMJ (biomechanics), lactate and HR (physiology) and RPE-TQR (psychophysiological) in a repeated (performance), stroke frequency and CMJ (biomechanics), lactate and HR (physiology) and RPE-TQR (psychophysiological) in a repeated maximal speed swimming effort in elite swimmers. Methods: A total of 18 elite swimmers participated in this randomized, double-blind study. In 2 different trials, swimmers ingested a Beet-It injection (70 ml placebo (PL) or a Beet-It injection of 70 ml beet juice (BJ)) 3 hours before undergoing a 2x6x100 m intermittent maximal speed crawl performance test.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
TRIPLE
Enrollment
18
The swimmers drank 3 hours before the test, mL70 of BJ (containing mmol6.4 of NO-3) (Beet-It-Pro Elite Shot, James White Drinks Ltd., Ipswich, UK) or PLA (0.04 mmol of NO-3)
The swimmers drank 3 hours before the test, mL70 of BJ (containing mmol6.4 of NO-3) (Beet-It-Pro Elite Shot, James White Drinks Ltd., Ipswich, UK) or PLA (0.04 mmol of NO-3)
Universidad Francisco de Vitoria
Madrid, Pozuelo de Alarcón, Spain
Lactate concentration
After qeach even series of 100m (2nd, 4th, 6th and 3' rest), their finger was wiped dry and their blood lactate concentration was measured with a Lactate Pro2 portable analyzer 1 minute after completing each 100m series.
Time frame: 3 hours post-dose of Beetroot juice or Placebo
Rate of Perceived Exertion
During every 100m, they were asked how much effort they had exerted using the subjective RPE scale as in other studies with BJ and swimming.
Time frame: 3 hours after ingestion of the beetroot juice
Recovery Total Quality Scale
Before the swimmers performed the next 100m, they were asked how recovered they felt, using another subjective TQR scale.
Time frame: 3 hours after ingestion of the beetroot juice
Total Time
The complete 2x6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the total times, with the program KINOVEA 0.9.5.
Time frame: 3 hours after ingestion of the beetroot juice
Parcial Time
The complete 2x6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the split times, with the KINOVEA 0.9.5 program.
Time frame: 3 hours after ingestion of the beetroot juice
Counter Movement Jump
Swimmers completed three repetitions of CMJ with hands on waist using an infrared jumping system (Optojump Next, Microgate, Bolzano, Italy)
Time frame: 3 hours after ingestion of the beetroot juice
Stroke rate
The complete 2x6x100 main test was recorded with a JVC model GY-HM150E video camera placed on the stand of the facility itself at about 10 m from the start/turn wall (approximately 5 m above and 10 m from the swim lane) to record the entire session. The recording of the session made it possible to calculate the stroke rate, with the KINOVEA 0.9.5 program.
Time frame: from the day of randomization to the last day of the intervention: up to day 7
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