HEMATOLOGIC RESPONSE TO A CROSSFIT (R)-BASED HIGH-INTENSITY INTERVAL TRAINING (HIT) SESSION

Aim: To evaluate the hematologic response to a CrossFit r -based high-intensity interval training (HIIT) session. Method: Pre-experimental study involving nine men (25.4+/-4.3 years). In this study, blood samples were taken before and after a HIIT training session of 15 minutes in the main phase. Hematological variables were analyzed through a blood count of fourth generation. Results: The obtained results showed a significant difference (p< 0.05) in red blood cells (%.: -1.35; ES: 0,222), hemoglobin concentration (%.: 1,18; ES: 0,263), hematocrit percentage (%.: -1,72; ES: 0,448), Mean Corpuscular Volume (%.: -0,47; ES: 0,108), and lymphocyte (%.: -24,89; ES: 0,855), and eosinophils count (%.: -24,32; ES: 0,290) when comparing samples before and after the session. There were no significant changes in other parameters. Conclusion: It is necessary to go deeper in the study of hematological variables in the HIIT, in order to optimize performance parameters, decrease the prevalence of injuries, and improve nutrition and supplementation strategies.