An interventional study of Soidum Bicarbonate and Placebo in Supplementation, sponsored by Universidad de Burgos. Completed at 1 site in Spain. Open to male participants, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-06-12.
Sponsored by Universidad de Burgos · Not applicable, Interventional, and Treatment
The objetive of the study was to determine whether sodium bicarbonate supplementation improves athletic performance and/or reduces fatigue in elite rugby players.
The participants were 17 elite rugby players. Half of the participants receive sodium bicarbonate (0.3 g/kg body weight), the other half receive a placebo (salt). Ingestion of the supplementation/placebo occured 90 minutes before high-intensity rugby-specific training Variables analysed were measure at baseline, prior to exercise, during exercise and after exercise.
Universidad de Burgos is the lead sponsor of 24 studies on the registry; 4 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Exclusion Criteria:
Supplementation with 0.3 g/kg of sodium bicarbonate
Dietary Supplement: Soidum Bicarbonate
Supplementation with placebo: 0.03 g·kg-1 body mass sodium chloride
Dietary Supplement: Placebo
Supplementation with 0.03 g/kg of sodium bicarbonate
0.03 g·kg-1 body mass sodium chloride
Capillary blood lactate
Lactate concentrations were measured in a capillary blood sample obtained fromparticipants' fingertips using a portable analyzer (Lactate 2, Arkray, Kyoto, Japan)
Time frame: At baseline (prior to supplementation), prior to exercise (immediately before beginning exercise protocol), after exercise (immediately after finishing exercise protocol).
Countermovement jump
For the CMJ, subjects started from an upright position withhands on waist and then executed a countermovement jump by flexing the knees to 90◦and jumping as high as possible. During the flight stage, they were instructed to keep theirknees extended to 180◦, without hyperextending the hips . Jump height was measuredon an infrared platform (Optojump, Microgate, Bolzano, Italy).
Time frame: At baseline (prior to supplementation) and after exercise (immediately after finishing exercise protocol).
Gastrointestinal (GI) symptoms
Questionnaires consisted of nine 100-mm visual analog scales (VASs). The VASs were anchored at each end with no symptom on the left-hand side and severe symptom on the right-hand side. Participants were asked to rate the severity of their symptoms. If they were experiencing no symptoms, they circled the appropriate words, for example, no nausea. If they were experiencing some symptoms, they indicated their overall rating by placing a vertical mark on the line. The VASs were used to measure symptoms of nausea, flatulence, stomach cramping, belching, stomachache, bowel urgency, diarrhea, vomiting, and stomach bloating.
Time frame: At baseline (before supplementation), prior to exercise (immediately before beginning exercise protocol), after exercise (immediately after finishing exercise protocol).
Plan to share: No — Confidential data regarding a rugby club
No publications or documents are linked to this record.
This study is completed, as verified in Jun 2025. You cannot join it, but the record below documents what was studied.
Get an email when the registry record changes — status, dates, results — or when someone posts here.
Sign in to followQuestions and observations about this study, from anyone following it. Not medical advice, and not a channel to the study team — their contact details are on the registry record.
Sign in to join the discussion. Reading takes no account; posting does. You choose a display name, and a pseudonym is the default.
Nothing here yet. If you are running this trial, taking part in it, or weighing whether to, this is the place to say so.
Universidad de Burgos