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The relationship between eccentric utilization ratio and selected parameters of tensiomyographyPleša, Jernej ; Kovačič, Klara, 1997- ; Samardžija Pavletič, MitijaThe difference between countermovement jump (CMJ) and squat jump (SJ), termed eccentric utilization ratio (EUR) was traditionally used as a metric that presents the capability to store and use ... elastic energy during the execution of vertical jump. Recent literature raised the theory that higher values of EUR might not be due to good use of elastic energy, but is instead due to a poorer ability to rapidly increment force and to increased muscle laxity during SJ performance. The purpose of this study was to check the correlations between EUR and muscle contractile properties measured with tensiomyography (TMG). Results showed that jump height parameters had no significant correlations with TMG parameters, while EUR showed strong to very strong correlations with all TMG parameters. Therefore, EUR seems to be influenced by TMG parameters regarding muscle contraction time and radial displacement of the muscle. Positive correlations indicate that higher values of EUR are a consequence of longer muscle contraction time and/or higher radial displacement, which indicates higher muscle laxity. Results of this study approves current theory, that higher values of EUR may not be due to good use of elastic energy, but is instead due to a poorer ability to rapidly increment force and to increased muscle laxity. Based on the results of this study, the utility of the EUR in sport setting is questioned. From a practical standpoint, the current knowledge implies that EUR does not represent useful metric for decision-making regarding training design, thus general recommendations for training decisions cannot be given based on the value of the EUR.Type of material - conference contribution ; adult, seriousPublish date - 2022Language - englishCOBISS.SI-ID - 123605251
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