Purpose To determine whether stiffness of the patellar tendon and quadriceps muscles is altered immediately after and 48 h after a single bout of maximal eccentric exercise of the knee extensor muscles. Methods Thirteen healthy individuals [group mean (SD) age 22.4 (3.5) years; 7 female] performed a single bout of maximal eccentric exercise of the non-dominant knee extensors, using an isokinetic dynamometer. Shear-wave velocity (an index of tissue stiffness) was recorded from the patellar tendon, vastus medialis (VM), rectus femoris (RF) and vastus lateralis (VL), before, following (post ), and 48 h after (post ) exercise. To investigate features of exercise induced muscle damage, 0 48 maximal voluntary isometric contraction (MVIC) and self-reported pain and stiffness (numerical rating scales 0 = no pain/ stiffness to 100 = worst imaginable pain/stiffness) were measured before, post , and pos t exercise. Serum creatine kinase 0 48 (CK) was measured before and post exercise. Results Compared to preexercise, MVIC decreased and self-reported pain and stiffness increased at post and pos t and CK 0 48 levels increased at post (all p < 0.01). Compared to preexercise, shear-wave velocity was greater at post for the patellar 48 0 tendon [15.9 (24.6)%, p = 0.01]
European Journal of Applied Physiology – Springer Journals
Published: May 31, 2018
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