Relationship between Reactive Strength and Leg Stiffness at Submaximal Velocity: Effects of Age on Distance Runners

Diego Jaén-Carrillo, Antonio Cartón-Llorente, Demetrio Lozano-Jarque, Alberto Rubio-Peirotén, Luis E. Roche-Seruendo and Felipe García-Pinillos
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Diego Jaén-Carrillo: Department of Physiotherapy, Universidad San Jorge, Autovía Mudéjar, Km. 299, 50830 Villanueva de Gállego Zaragoza, Spain
Antonio Cartón-Llorente: Department of Physiotherapy, Universidad San Jorge, Autovía Mudéjar, Km. 299, 50830 Villanueva de Gállego Zaragoza, Spain
Demetrio Lozano-Jarque: Department of Physiotherapy, Universidad San Jorge, Autovía Mudéjar, Km. 299, 50830 Villanueva de Gállego Zaragoza, Spain
Alberto Rubio-Peirotén: Department of Physiotherapy, Universidad San Jorge, Autovía Mudéjar, Km. 299, 50830 Villanueva de Gállego Zaragoza, Spain
Luis E. Roche-Seruendo: Department of Physiotherapy, Universidad San Jorge, Autovía Mudéjar, Km. 299, 50830 Villanueva de Gállego Zaragoza, Spain
Felipe García-Pinillos: Department of Physical Education, Sports and Recreation, Universidad de La Frontera, Francisco Salazar, Temuco 1145, Chile

IJERPH, 2021, vol. 18, issue 13, 1-9

Abstract: 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.

Keywords: jumping; performance; running; stretch-shortening cycle; plyometric exercises (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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