![]() ![]() This term refers to there being no single justifying cause of the etiology of fatigue, since it is considered as a gradual process that involves several and complex physiological changes inside and outside the muscle, which occur before and during mechanical failure. This process is known as the “task-dependent factors”, and is one of the principles that have emerged in this era. įatigue occurs due to the impairment of one or several physiological processes that allow muscle fibers to generate force. In sports sciences, the stimulus would be the physical activity, leading to the accumulation of certain metabolites within the muscle fibers or an inadequate motor command in the motor cortex. Fatigue can be generally defined as a decrease in physical performance related to a rise within the real/perceived difficulty of a task or exercise, as well as the inability of the muscles to keep up with the specified level of strength during exercises. Therefore, all these prisms must be considered for future approaches from sport and clinical perspectives.įatigue is defined as an internal homeostasis breakdown caused by an increase in energy production demanded by an external stimulus. Then, fatigue can have different origins not only related with physiological factors. Sleep deprivation or psychological disturbances caused, for example, by stress, can affect neural activation patterns, realigning them and slowing down simple mental operations in the context of fatigue. Fatigue is conditioned by factors such as gender, affecting men and women differently. ![]() The relative activity of each one is regulated by dynamic negative feedback activity, as the fundamental general operational controller. ![]() Central and peripheral fatigue are two unison constructs part of the Integrative Governor theory, in which both psychological and physiological drives and requirements are underpinned by homeostatic principles. The main search engines were PubMed, SciELO, and Google Scholar. To reach this aim, a consensus and critical review were performed using both primary sources, such as scientific articles, and secondary ones, such as bibliographic indexes, web pages, and databases. The present narrative review aims to analyze the multifactorial factors of fatigue in physical exercise. Then, it is essential to understand the fatigue mechanism to help trainers and physicians to prescribe an adequate training load. The study of the origin and implications of fatigue in exercise has been widely investigated, but not completely understood given the complex multifactorial mechanisms involved. ![]()
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