Relationship between Reactive Strength and Leg Stiffness at Submaximal Velocity: Effects of Age on Distance Runners
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AuthorJaén Carrillo, Diego; Cartón Llorente, Antonio; Lozano Jarque, Demetrio; Rubio Peirotén, Alberto; Roche Seruendo, Luis Enrique; García Pinillos, Felipe
JumpingPerformancesRunningStretch-shortening cyclePlyometric exercise
Jaén-Carrillo, D.; Cartón-Llorente, A.; Lozano-Jarque, D.; Rubio-Peirotén, A.; Roche-Seruendo, L.E.; García-Pinillos, F. Relationship between Reactive Strength and Leg Stiffness at Submaximal Velocity: Effects of Age on Distance Runners. Int. J. Environ. Res. Public Health 2021, 18, 6866. https://doi.org/10.3390/ ijerph18136866
Background: Musculotendinous reactive strength is a key factor for the utilization of elastic energy in sporting activities such as running. AIM: To evaluate the relationship between musculotendinous reactive strength and lower-limb stiffness during running as well as to identify age-related differences in both variables. Methods: Fifty-nine amateur endurance runners performed three 20-cm drop jumps and a constant 3-min easy run on a motorized treadmill. Reactive strength index and dynamic lower-limb stiffness were calculated with a photoelectric cell system by jumping and running, respectively. Additionally, sit to stand difference in plantar arch height was assessed as a static lower-limb stiffness measure. The cluster analysis allows the comparison between younger and older runners. Results: No significant correlations were found between jumping reactive strength and running lower-limb stiffness. The younger group performed better at drop jumps (p = 0.023, ES = 0.82), whereas higher-but-no-significant results were found for reactive strength index and stiffness-related metrics. Conclusions: Musculotendinous vertical reactiveness may not be transferred to combined vertical and horizontal movements such as running.