Relation between blood lactate and quality of the Ippon-Seoi-Nague technique before and after the application of the Special Judo Fitness Test
Abstract
Introduction and objective: Lactate, along with other metabolic products, is used as a fatigue marker. Therefore, the objective of the present study was to analyze whether the accumulation of blood lactate after the application of the Special Judo Fitness Test (SJFT) is able to influence the Ippon-Seoi-Nague technique in judokas. Materials and methods: The sample consisted of 15 judokas, aged between 15 and 20 years, who had been practicing the sport for at least 7 years. The Ippon-Seoi-Nague technique was filmed in order to make a subjective assessment of the quality of the stroke, in addition to the heart rate and blood lactate, before and after the application of the SJFT. For descriptive statistics, absolute and percentage values were used, in addition to the mean and standard deviation. For inferential statistics, the t test for paired samples and Pearson's correlation were used. For all analyses, the statistical program SPSS for Windows 20.0 was used. The significance level adopted was 5%. Results and discussion: There was a significant increase in blood lactate from pre-test (2.91 ± 0.80 mmol/L) to post-test (10.50 ± 3.24 mmol/L). However, a significant improvement in the technical quality of the stroke was identified when analyzing the trunk (1.91±0.34 to 1.66±0.37; p=0.022), hip (2.13±0.61 to 1.77 ±0.58; p=0.011) and complete technique (2.15±0.64 to 1.80±0.51; p=0.012). Conclusion: Significant improvements were identified in the biomechanics of applying the Ippon-Seoi-Nague blow when analyzing the trunk and hip joints and in the complete technique, even with a significant increase in blood lactate from pre to post-test.
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