Evaluation of the level of physical activity through musculo-articular stiffness in young adults
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Abstract
The purpose of the study is to evaluate the level of physical activity of young adults by means of the Musculo-articular stiffness and to analyse its correlation with the physical performance measured in jump capacity. The proposed protocol includes a Muscle-articular test of both legs, a test of maximum voluntary contraction in isometric conditions (MVCi), a countermovement jump test (CMJ), and a drop jump (DJ) protocol from different heights (20, 40 and 60 cm). 21 healthy young adult subjects (12 males and 9 females). The mechanical variables are: force (f), Muscle-articular stiffness (k) and Muscle-articular Unitary stiffness (ku). Physical variables: Jump flight height (h) and force generated (f). An Anova of repeated measurements was performed to analyse the influence of gender and laterality and a Pearson correlation to analyse the relationship between mechanical and physical parameters. The results obtained show a clear symmetry in physical and mechanical parameters. There were significant differences between men and women (f and k) (p smaller than 0.05) being in absolute terms higher in men than in women but not in relative terms (ku). A clear correlation was obtained between mechanical parameters and MVCi in absolute terms (p smaller than 0.05). Ku allows comparisons between different subjects but its interpretation is not as intuitive as in absolute terms due to the application of the Hill’s model on the mechanical response of muscle-tendon complexes that establishes a nonlinear relationship between f and k.
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