Introduction: Ischemic training, otherwise known as blood flow restricted exercise or vascular occlusion training, is a combination of exercise and occlusion of blood flow in the working muscle. While the underlying mechanisms remain relatively unknown, blood flow restriction is used in the treatment of injuries, exercise programs for elderly adults and supplementary training for athletes because of its unique ability to produce similar results as high load exercise whilst using low loads. This allows participants to avoid potential tissue injury, which can arise from overly big mechanical loads produced by using heavy resistance. Purpose: The purpose of this literature review was to analyse the effects of ischemic training of low to medium resistance on the improvement of sport-specific muscular endurance. Methods: Literature search was conducted in PubMed, PEDro, Cochrane library and SPORTDiscus databases using the following keywords: blood flow restriction, vascular occlusion, occlusion training, endurance, athletes and sport performance. Results: Five studies fit the inclusion criteria. Included participants ranged from beginner athletes to elite-level competitors. Great variability was observed in the protocols used in the studies. All experimental groups performed sport-specific exercise while wearing tourniquets that provided occlusion of the blood flow. Control groups performed either the same protocol without blood flow restriction or a similar protocol at a higher intensity. Sport-specific endurance was measured by different tests, specific of the sport disciplines of the participants. In four studies, comparison of measurements between experimental and control groups after the intervention demonstrated statistically significant improvement. In one study, the improvements did not reach statistical significance. Discussion and conclusion: Ischemic exercise has been shown to be an effective method for improving muscular endurance. More research is needed to determine the optimal parameters of its application, as well as including more female participants to further understand the difference between the effects on both sexes. Furthermore, more research is needed to assess safety concerns and potential adverse effects on local tissues while using blood flow restriction.
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