Suplementace dietními nitráty, tělesná práce a sportovní výkonnost. II. část.
| Title in English | Dietary Nitrate Supplementation, Exercise and Sports Performance. Part II. |
|---|---|
| Authors | |
| Year of publication | 2016 |
| Type | Article in Periodical |
| Magazine / Source | Med.Sport.Boh.Slov. |
| MU Faculty or unit | |
| Citation | |
| Field | Sport and leisure time activities |
| Keywords | NO synthase activity; oxygenation; muscle typology; frequency and duration of supplementation; supplement doses; plasma levels of nitrite; efficiency of muscle work; resistance to high intensity exercise; uncontrolled nitrate supplementation. |
| Description | The performance of physically inactive or less trained population is more influenced by nitrate supplementation than in endurance-trained athletes. Causes of these differences can be numerous and may involve different NOS activity, oxygenation, muscular typology, frequency, duration and dose of dietary nitrate. It seems that the key condition for the efficiency of nitrate supplementation may be the level of nitrite in plasma before and after supplementation. Most endurance trained athletes has plasma nitrite levels higher than untrained individuals. That is why elite athletes exhibit after nitrate supplementation minor change in plasma nitrite, submaximal work efficiency, resistance to high intensity exercise and athletic performance. For those elite athletes who experience after administration of inorganic nitrates in a significant increase in nitrite plasma levels, it is possible to expect a positive effect on athletic performance. However, currently it is necessary to avoid uncontrolled administration of nitrate supplements that at higher doses and longer duration of supplementation that can lead to endothelial dysfunction and disturbance of some physiological functions. Nitrate supplementation inhibits ergolytic influence of hypoxic environment and as in normoxic conditions, improves efficiency submaximal work and increases tolerance to high intensity exercise. However, influence of inorganic nitrates on endurance sports performance is small and concerns usually less trained individuals. Training in hypoxic conditions probably has no effect on plasma levels of nitrite. At present, there is not enough evidence to support the systematic nitrate supplementation as a reason to improve the results of high-altitude training or to enhance the performance of athletes in the alpine environment. Research on the effects of nitrate supplementation is still at an early stage. It will be necessary to implement further studies both to identify factors that might explain differences in susceptibility nitrate supplementation and also to monitor the possible benefits dietary nitrate supplementation in the general population, even athletes. |
| Related projects: |