The findings of a study conducted on weightlifters between the ages of 15 and 16 at the EIDE "Captain Orestes Acosta" in Santiago de Cuba are compiled in this paper. From the application of methods and techniques to training and competitions, such as observations, semi-structured interviews with athletes and coaches, the Inventory of Psychological Performance, the Attitude Test for Competition, the Inventory of Evaluation of Error in Performance, and others; It was discovered that these athletes failed to successfully complete the lifts, resulting in a high level of tension, insecurity, and nervousness, among other negative psychological manifestations that harmed the athlete's performance and were connected to irrational or maladaptive beliefs and thoughts. An action plan was put into place with the help of the psychologist, coaches, athletes, and family members to help solve this problem. It was an open, adaptable, active, practical, and experiential group. The cognitive restructuring of dysfunctional ideas and thoughts that prevent adequate sports performance demonstrated its effectiveness.

Diabetes mellitus (DM) and complications associated with diabetes are one of the leading causes of death worldwide. The International Diabetes Federation (IDF) has estimated that 592 million people will suffer from diabetes by 2035. Therefore, it is vital to find a new biomolecule that can further help in the treatment of diabetes. For several decades, a persistent interest in the biological properties of melatonin (MT) has been maintained in biological science and medicine. In recent years, a lot of information has appeared about its participation in maintaining energy homeostasis and the genesis of diabetes mellitus. The purpose of this review is to study the pathogenetic mechanism of melatonin in diabetes mellitus