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Shear-wave velocity of the patellar tendon and quadriceps muscle is increased immediately after maximal eccentric exercise.

Abstract：

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 (post0), and 48 h after (post48) exercise. To investigate features of exercise induced muscle damage, 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, post0, and post48 exercise. Serum creatine kinase (CK) was measured before and post48 exercise. RESULTS:Compared to preexercise, MVIC decreased and self-reported pain and stiffness increased at post0 and post48 and CK levels increased at post48 (all p < 0.01). Compared to preexercise, shear-wave velocity was greater at post0 for the patellar tendon [15.9 (24.6)%, p = 0.01] and RF [23.6 (16.7)%, p < 0.001], each returning to baseline by post48. No significant differences were observed for VL or VM post0 or post48 exercise. CONCLUSION:Maximal eccentric exercise produced an immediate increase in the stiffness of the patellar tendon and RF, resolving by 48 h. As this change was not observed in VL and VM, future studies may explore heterogeneity within synergist muscles following eccentric exercise.

journal_name

Eur J Appl Physiol

journal_title

European journal of applied physiology

authors

Heales LJ,Badya R,Ziegenfuss B,Hug F,Coombes JS,van den Hoorn W,Tucker K,Coombes BK

doi

10.1007/s00421-018-3903-2

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

1715-1724

issue

eissn

1439-6319

issn

1439-6327

pii

10.1007/s00421-018-3903-2

journal_volume

118

pub_type

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Shear-wave velocity of the patellar tendon and quadriceps muscle is increased immediately after maximal eccentric exercise.