Influence of Sodium Bicarbonate on Time-to-exhaustion at Critical Power in Endurance Athletes
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During endurance exercise in the heavy and severe intensity domains, the rate at which metabolites that have been associated with the fatigue process (e.g. Pi, ADP, H, and extracellular K) accumulate increases. possibly leading to exercise cessation. Sodium bicarbonate, as a nutritional supplement, has gained attention over the past decades, because it might delay of offset fatigue. To date, there is a controversial discussion about which delivery mode (amount and frequency) might be best in optimizing endurance performance. Since the high ion load consequent to multiple ingestions might increase plasma volume, and consequently decrease bicarbonate concentrations, single acute ingestion could be more beneficial. However, in multi-day competitions or tournaments it might be necessary to use the supplement on a daily basis. Here, the investigators aim at investigating the effects of single dose or multiple dose (on five consecutive days) administration of bicarbonate vs. placebo increases endurance performance and acid-base homeostasis in trained male endurance athletes.
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Ages Eligible for Study:
18 Years to 45 Years (Adult)
Sexes Eligible for Study:
Accepts Healthy Volunteers:
Inclusion criteria: - male
no cold or temperature at beginning or during the study
between 18 and 45 years of age
active in endurance sports (3 to 5 times per week a moderate to hart training)
no known cardiovascular or orthopedic problems
no known limitations of kidney function
no bearer of a cardiac pacemaker
no medications with direct influence on the measurements. The whole intake of medicaments has to be declared in the health questionnaire by the participant.
requirements of the health questionnaire fulfilled
Exclusion criteria: - female
male and age under 18 or over 45 years
cold or temperature at the beginning or during the study
untrained (less than 3 moderate trainings per week)
cardiovascular or orthopedic problems
limitations of the kidney function
bearer of a cardiac pacemaker
medication with direct influence on the measurements. The whole intake of medicaments has to be declared in the health questionnaire by the participant.
requirements of the health questionnaire not fulfilled