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Isotonic drinks belong to a group of products which are becoming more and more popular among teenagers, sportsmen, as well as the elderly and fitness-oriented people. The proper osmolality of isotonic drinks should be of 300 mOsm kg⁻¹ of water ±10%. The objective of this study is to analyse whether the isotonic drinks available on the Tricity market (the area of three cities: Gdańsk, Sopot, Gdynia) are authentic isotonic drinks. For the purpose of the study 25 bottles of isotonic drinks of different brands and flavours have been purchased. The osmolality of the majority of the drinks was within the recommendations of European Union – from 270 to 330 mOsm kg⁻¹ of water. Twelve of the drinks have not got the osmolality declared by the manufacturers. Six of them have not met the requirements for an isotonic drink (two of these had not been declared to be isotonic drinks). It seems that manufacturers should observe the quite broad limit of osmolality and the criterion of osmolality is the evidence for their authenticity.
Background. Athletic performance can be substantially enhanced with supplements and functional food which are considered by scientists as efficient, safe and legal, such as protein, carbohydrate and protein-carbohydrate supplements, isotonic sports drinks, carbohydrate-protein bars, carbohydrate bars, creatine and caffeine. Objective. The study is aimed at an analysis and evaluation of the prevalence of using effective ergogenic aids (creatine, caffeine, isotonic drinks, carbohydrates, and proteins) in a group of Polish professional athletes. Material and Methods. The research was conducted on 600 athletes (216 women, 384 men) practicing various sports disciplines; the younger group (18-23 years old) consisted of 307 people, while the older one (24-35 years old) was comprised of 293 subjects. A questionnaire was used with questions concerning the frequency and types of consumed supplements. Results. Nearly half of the athletes (48,2%) admitted to taking supplementation, of which 36.7% consumed the supplements occasionally and 11.5% continually. The majority of the group (75.4%) claimed to be consuming isotonic drinks, which were the most commonly chosen nutritional aid enhancing physical performance, most frequently supplementing the diet in a continuous manner (41.2%). The least frequently used supplement was creatine, chosen by only one in three interviewees (34,5%). The ergogenic aids were used more often by men than women (50.5% vs. 44.1%), and so were nutrients based on proteins (51.8% vs. 32.0%), carbohydrates (60.7% vs. 46.8%), protein-carbohydrates (45.6% vs. 32.9%), as well as creatine (39.8% vs. 25.0%). The studies showed the inessential difference in the frequency of taking supplementation based on the interviewees’ age (0.4%). Conclusions. Competitors who use supplements over those who choose not to, seems to reflect the continuous lack of the athletes’ sufficient awareness of the effectiveness, safety, and health benefits of dietary supplementation that enhances physical performance.
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