TY - JOUR
T1 - Trapezius viscoelastic properties are heterogeneously affected by eccentric exercise
AU - Kawczyński, Adam
AU - Mroczek, Dariusz
AU - Andersen, Rasmus Elbæk
AU - Stefaniak, Tadeusz
AU - Arendt-Nielsen, Lars
AU - Madeleine, Pascal
N1 - Copyright © 2018 Sports Medicine Australia. Published by Elsevier Ltd. All rights reserved.
PY - 2018/8/1
Y1 - 2018/8/1
N2 - OBJECTIVES: The aim of this study was to investigate the influence of eccentric exercise (ECC) on the spatial mapping of muscle stiffness and creep of the upper trapezius, using a quantitative myotonometry device.DESIGN: Two groups of 16 subjects participated in the experimental sessions. In part A, the test-retest reliabilities of muscle stiffness and creep were assessed. In part B, muscle stiffness and muscle creep were mapped before, immediately after and 24h after ECC when post-exercise soreness had developed.METHODS: The ECC protocol consisted of 50 eccentric contractions divided into 5 bouts of 10 contractions at maximum force level.RESULTS: The relative reliabilities of stiffness and creep measurements were found to be substantial to almost perfect. Muscle stiffness for musculotendinous sites increased at 24h after ECC while it decreased for muscle belly immediately after and 24h after ECC. Muscle creep for musculotendinous sites decreased, and for muscle belly sites increased, immediately after and 24h after ECC.CONCLUSIONS: For the first time, the present study showed sign of discrepancies in the effects of ECC on muscle stiffness and creep, underlining opposite changes in the musculotendinous and muscle belly viscoelastic properties of upper trapezius.
AB - OBJECTIVES: The aim of this study was to investigate the influence of eccentric exercise (ECC) on the spatial mapping of muscle stiffness and creep of the upper trapezius, using a quantitative myotonometry device.DESIGN: Two groups of 16 subjects participated in the experimental sessions. In part A, the test-retest reliabilities of muscle stiffness and creep were assessed. In part B, muscle stiffness and muscle creep were mapped before, immediately after and 24h after ECC when post-exercise soreness had developed.METHODS: The ECC protocol consisted of 50 eccentric contractions divided into 5 bouts of 10 contractions at maximum force level.RESULTS: The relative reliabilities of stiffness and creep measurements were found to be substantial to almost perfect. Muscle stiffness for musculotendinous sites increased at 24h after ECC while it decreased for muscle belly immediately after and 24h after ECC. Muscle creep for musculotendinous sites decreased, and for muscle belly sites increased, immediately after and 24h after ECC.CONCLUSIONS: For the first time, the present study showed sign of discrepancies in the effects of ECC on muscle stiffness and creep, underlining opposite changes in the musculotendinous and muscle belly viscoelastic properties of upper trapezius.
KW - Eccentric exercise
KW - Muscle stiffness
KW - Muscle viscoelastic properties
KW - Upper trapezius
KW - Young Adult
KW - Pain
KW - Humans
KW - Superficial Back Muscles/physiology
KW - Elasticity
KW - Exercise/physiology
KW - Female
KW - Male
UR - http://www.scopus.com/inward/record.url?scp=85041055200&partnerID=8YFLogxK
U2 - 10.1016/j.jsams.2018.01.005
DO - 10.1016/j.jsams.2018.01.005
M3 - Journal article
C2 - 29395631
SN - 1440-2440
VL - 21
SP - 864
EP - 869
JO - Journal of Science and Medicine in Sport
JF - Journal of Science and Medicine in Sport
IS - 8
ER -