Is it genuinely beneficial to use isotonic beverages?

Isotonic beverages are a type of sports supplement whose main goal is to provide the body with necessary energy, mineral, and vitamin sources. They are typically ready-made liquid mixtures, however, isotonic powders have been gaining popularity in recent times, allowing for the use of different substance ratios per unit of liquid. Regular consumption of isotonic drinks enables more efficient training and additionally the absence of noticeable catabolic processes. Many professional athletes in the final stages of preparation use BCAA to avoid losing their built-up muscle mass. Unfortunately, not everyone can afford to take 80-120 g of such amino acids daily. Therefore, isotonic beverages represent a cost-effective, high-quality alternative for such supplements. In fact, this very explanation accounts for their popularity.

In order to explain the importance of isotonic drinks, certain physiological processes need to be understood. Trainings, whether aerobic or anaerobic, raise body temperature. When strength training, a person produces much more heat. A part of the brain known as the hypothalamus activates a protective mechanism to prevent overheating of the body. Specific signals sent to the relevant glands cause sweating. As a result of this process, the skin is covered with sweat, and the external temperature absorbs body heat, cooling it down. Unfortunately, the body loses a huge amount of microelements, especially salts, potassium, and magnesium. Such losses have a negative impact on the overall condition of the body. This process is most visible during the reduction phase, when the body experiences constant water shortage due to the burning of fat tissue. One of the main disadvantages of potassium deficiency is the reduction of neuromuscular functions of muscle fibers. This means that nerve signals are less effective, which leads to poorer performance of muscle contractions. This fact is often noticed by bodybuilders who spend less and less time on strength training as competitions approach. In addition, the lack of microelements during the reduction phase causes the bone tissue and tendons to become more sensitive, which can lead to various injuries. If it comes to magnesium, its deficiency leads to painful muscle cramps. The following information has contributed to the development of special isotonic drinks. Regular use of isotonics during training allows for the replenishment of lost microelements and the restoration of the electrolyte balance in the body.

It is no secret that isotonic beverages contain relatively high amounts of calories. Of course, they do not contain, for example, 1000 kcal per serving, but one dose (10–40 ml) can contain 20 to 45 kcal, and their source is simple carbohydrates. Most often, it is maltose, glucose, or isomaltose. Unfortunately, during a weight loss regimen, this type of isotonic beverage only slows down the fat-burning process. In such a situation, beverages with low calorie content should be selected, which contain vitamins, minerals, and sometimes even caffeine, which helps to oxidize fat and increase training intensity. Many people question whether isotonic beverages are even necessary during a weight loss regimen. There is even a stereotype that such beverages are needed only during muscle mass building. However, reality is somewhat different. Isotonic beverages can indeed facilitate the training process during a weight loss regimen, but only in the case of a lack of simple carbohydrates. If the body has a constant deficiency of microelements and fluids, the fat-burning process will be slowed down.

There are special isotonic beverages that contain a high amount of calories and additional components such as creatine and BCAA. These drinks can greatly enhance the effectiveness of training and help overcome fatigue. If creatine is present in the drink, the strength indicators will improve. However, it is important to note that the high caloric content of isotonic drinks depends on the appropriate amount of carbohydrates. Isotonic drinks should be consumed in small portions throughout the entire duration of the training to avoid negative effects. Too large of an amount of carbohydrates consumed in a very short period of time can lead to a sudden increase in insulin levels. The main task of isotonic drinks is to maintain a high blood sugar level, but simple carbohydrates, when administered incorrectly, can cause an opposite reaction and lower blood sugar levels. In such a situation, the body will have to use free amino acids and even obtain them from muscle protein to maintain homeostasis.