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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Bibliographic Details
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
Format: Article
Language:English
Subjects:
639/166/985
692/700/1421/1860
692/700/565/491
Arm
Arm circumference
Elbow
Hardness
Humanities and Social Sciences
Hypotheses
multidisciplinary
Muscle contraction
Science
Science (multidisciplinary)
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Summary: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  
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-022-13184-3