Changes in biceps brachii muscle hardness assessed by a push-in meter and strain elastography after eccentric versus concentric contractions

Changes in biceps brachii muscle hardness assessed by a push-in meter (PM) and strain elastography (SE) were compared between eccentric (ECC) and concentric contractions (CON) of the elbow flexors to test the hypothesis that muscle hardness would increase greater after ECC. Ten men performed 5 sets...

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Published in:Scientific reports 2022-06, Vol.12 (1), p.9214-9214, Article 9214
Main Authors: Murayama, Mitsuyoshi, Inami, Takayuki, Shima, Norihiro, Yoneda, Tsugutake, Nosaka, Kazunori
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639/166/985
692/700/1421/1860
692/700/565/491
Arm
Arm circumference
Elasticity Imaging Techniques
Elbow
Elbow Joint - diagnostic imaging
Hardness
Humanities and Social Sciences
Humans
Hypotheses
Isometric Contraction
Male
multidisciplinary
Muscle contraction
Muscles
Science
Science (multidisciplinary)
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Nosaka, Kazunori
description Changes in biceps brachii muscle hardness assessed by a push-in meter (PM) and strain elastography (SE) were compared between eccentric (ECC) and concentric contractions (CON) of the elbow flexors to test the hypothesis that muscle hardness would increase greater after ECC. Ten men performed 5 sets of 10 ECC with their non-dominant arms and 5 sets of 10 CON with their dominant arms using a dumbbell corresponding to 50% of maximum voluntary isometric contraction (MVIC) force at 90º elbow flexion. Before and 1–4 days after the exercise, MVIC force, elbow joint angles, upper-arm circumference, and muscle soreness as muscle damage makers, and biceps brachii muscle hardness at maximally extended elbow joint by PM and SE were measured. Changes in these measures over time were compared between ECC and CON. All muscle damage markers showed greater changes after ECC than CON ( p  
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subjects 639/166/985
692/700/1421/1860
692/700/565/491
Arm
Arm circumference
Elasticity Imaging Techniques
Elbow
Elbow Joint - diagnostic imaging
Hardness
Humanities and Social Sciences
Humans
Hypotheses
Isometric Contraction
Male
multidisciplinary
Muscle contraction
Muscles
Science
Science (multidisciplinary)
title Changes in biceps brachii muscle hardness assessed by a push-in meter and strain elastography after eccentric versus concentric contractions
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