Nutrition, Healthy, Pulmonary Function
Conditions
Keywords
Cardiorespiratory performance, Time trial performance, Beetroot juice, Master rowers, well-trained
Brief summary
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.
Detailed description
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.
Interventions
DIETARY_SUPPLEMENTBeetroot juice ingestion
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.
DIETARY_SUPPLEMENTPlacebo ingestion
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.
Sponsors
Campus docent Sant Joan de Déu-Universitat de Barcelona
Study design
Allocation
RANDOMIZED
Intervention model
CROSSOVER
Primary purpose
OTHER
Masking
TRIPLE (Subject, Investigator, Outcomes Assessor)
Intervention model description
This study was a randomized, double-blind, crossover design
Eligibility
Sex/Gender
MALE
Age
30 Years to No maximum
Healthy volunteers
Yes
Inclusion criteria
1. national and/or international level; 2. without cardiovascular, respiratory, metabolic, neurological or orthopedic disorders that may affect the performance of the rowing ergometer test; 3. no consumption of drugs or medicines; 4. no smoking; 5. Informed consent to participate in the study signed by all rowers
Exclusion criteria
1. Ingestion of nutritional supplements taken in the three months prior to the start of the study; 2. no following the guidelines established by the nutrition professional.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Rowing performance: Time trial | through study completion, an average of 3 weeks | minutes:seconds (mm:ss) |
| Rowing performance: Mean Power output | through study completion, an average of 3 weeks | Watts |
| Rowing performance: meter per stroke | through study completion, an average of 3 weeks | Meters |
| Cardiorespiratory performance: absolute oxygen uptake | through study completion, an average of 3 weeks | V̇O2max (L/min) |
| Cardiorespiratory performance: relative oxygen uptake | through study completion, an average of 3 weeks | V̇O2max (mL/kg/min) |
| Cardiorespiratory performance: ventilatory efficiency | through study completion, an average of 3 weeks | slope of Ventilation/Carbon dioxide production |
| Metabolic performance: lactate | through study completion, an average of 3 weeks | mmol/L |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Cardiorespiratory performance: Maximum heart rate | through study completion, an average of 3 weeks | beats/min |
| Cardiorespiratory performance: Mean heart rate | through study completion, an average of 3 weeks | beats/min |
| Saturation | through study completion, an average of 3 weeks | percentage |
| Cardiorespiratory performance: minute ventilation | through study completion, an average of 3 weeks | minute ventilation in L/min |
| Scale of Perceived exertion ratio (RPE) | through study completion, an average of 3 weeks | Scale from 0 to 10. 0 = rest; 10 = maximum effort |
| Rowing performance: strokes | through study completion, an average of 3 weeks | Mean strokes per minute |
Countries
Spain
Outcome results
None listed