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Miha Pešič1, Sara Kranjc1, Mojca Fink1, Sara Gloria Meh1, Daniel Djurić1, Ziga Kozinc1,2

1University of Primorska, Faculty of Health Sciences, Polje 42, SI-6310 Izola, Slovenia
2University of Primorska, Andrej Marušič Institute, Muzejski trg 2, SI-6000 Koper, Slovenia

Rate of Force Development Scaling Factor in Hamstring Muscles: Feasibility and Relationship to Deadlift Performance among Resistance Trained Individuals

Sport Mont 2024, 22(2), 3-8 | DOI: 10.26773/smj.240701


The aim of this study was to examine the relationship among hamstring peak force (PF), rate of force development scaling factor (RFD-SF), countermovement jump (CMJ), and one-repetition maximum (1RM) strength in recreationally trained individuals, as well as to establish the feasibility of RFD-SD assessment for knee flexor muscles. Eighteen volunteers (12 males, 27.3 ± 5.2 years, 6 females, 24.4 ± 3.1 years) participated in the study. Participants performed a knee flexion maximal isometric voluntary contraction and followed a standard RFD-SF protocol. The 1RM for the deadlift was assessed to determine maximal dynamic strength, while CMJ was used to evaluate explosive movement capability. The study found no significant correlations between RFD-SF, CMJ, and 1RM. Additionally, it was observed that RFD-SF in the hamstring muscles can be effectively assessed (mean R2 = 0.92). In addition, RFD-SF was not different between men and women, which highlight its potential as sex-independent measure of knee flexor muscle function. Future research should involve a more diverse group of athletes to further investigate the relationships among RFD-SF, strength, and explosive movements like CMJ for more comprehensive insights.


deadlift, rapid force development, scaling factor, knee flexion, strength, countermovement jump

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