On 8 November at 14:00 will Martin Aedma defend his doctoral thesis „Assessment of the impact of selected dietary supplements on upper-body anaerobic power in wrestlers in simulated competition-day conditions“ in University of Tartu Museum White Hall, Lossi St. 25.
Professor Vahur Ööpik, Institute of Sport Sciences and Physiotherapy, University of Tartu
Professor Edith Filaire, PhD, Universite d’Orlears, France
The use of dietary supplements with intention to improve physical performance and/or increase the efficacy of training process is a widespread practice among athletes which often has no evidence-based basis. There is lack of scientific data regarding the impact of many marketed dietary supplements on human organism, or the data is scarce and controversial. The main purpose of this study was to determine the effects of ingestion of caffeine, sodium citrate and creatine on upper body anaerobic performance in trained wrestlers in simulated competition day conditions. In separated trials, athletes administered the aforementioned substances or placebo and then completed four performance tests with recovery periods between consecutive tests. Each performance test simulated a wrestling match and four consecutive tests interspersed with recovery periods simulated a competition day. Anaerobic power of upper body musculature was measured, considering that this is a critical factor that influences competitive success in wrestling. In addition, metabolic, perceptual and heart rate responses to performance tests were assessed.
In comparison with placebo, none of the ingested substances improved upper body anaerobic performance. Caffeine even had partially detrimental influence that was revealed in a reduction in peak power across the four tests. Elevated heart rate and blood lactate levels observed between consecutive tests suggest that caffeine impaired recovery processes. Prior sodium citrate ingestion increased blood buffer capacity, counteracted reduction in plasma volume and reduced perceived exertion during simulated competition day. Creatine ingestion induced higher exercise and early recovery heart rates but (similarly to caffeine) did not affect the ratings of perceived exertion during simulated competition day.