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Neuromuscular characteristics, such as lower-limb joint strength and the ability to rapidly generate force, may play an important role in leg-spring stiffness regulation. This study aimed to investigate the relationship between isokinetic knee and ankle joint peak torque (PT), the force-time characteristics of isometric mid-thigh pull (IMTP), and leg stiffness ( K  leg )/vertical stiffness ( K  vert ) in recreationally trained runners. Thirty-one male runners were recruited and underwent three separate tests. In the first session, the body composition,  K  leg , and  K  vert  at running speeds of 12 and 14 km⋅h –1  were measured. In the second session, isokinetic knee and ankle joint PT at 60°⋅s –1  were tested. The force-time characteristics of the IMTP were evaluated in the final session. Pearson’s product-moment correlations, with the Benjamini–Hochberg correction procedure, showed that the knee flexor concentric and eccentric and extensor concentric PT ( r  = 0.473–0.654,  p  &amp;lt; 0.05) were moderate to largely correlated with  K  leg  and  K  vert  at 12 and 14 km⋅h –1 . The knee extensor eccentric PT ( r  = 0.440,  p  = 0.050) was moderately correlated with the 14 km⋅h –1  K  vert . The ankle plantar flexor concentric and dorsiflexor eccentric PT ( r  = 0.506–0.571,  p  &amp;lt; 0.05) were largely correlated with  K  leg  at 12 km⋅h –1 . The ankle plantar flexor concentric and eccentric and dorsiflexor eccentric PT ( r  = 0.436–0.561,  p  &amp;lt; 0.05) were moderate to largely correlated with  K  vert  at 12 and 14 km⋅h –1 . For IMTP testing, high correlation was only found between the IMPT peak force (PF) and  K  vert  at 14 km⋅h –1  ( r  = 0.510,  p  = 0.014). Thus, superior leg-spring stiffness in recreational runners may be related to increased knee and ankle joint strength, eccentric muscular capacity, and maximal force production.

Relationship Between Isokinetic Lower-Limb Joint Strength, Isometric Time Force Characteristics, and Leg-Spring Stiffness in Recreational Runners