Changes in Muscle Shear Modulus and Urinary Titin N-Terminal Fragment After Eccentric Exercise

Overview

Journal J Sports Sci Med

Specialty Orthopedics

Date 2022 Dec 16

PMID 36523897

Authors

Takayuki Inami

Shota Yamaguchi

Hiroyuki Ishida

Naohiko Kohtake

Akihisa Morito

Satoshi Yamada

Masatsugu Shimomasuda

Maki Haramoto

Naoya Nagata

Mitsuyoshi Murayama

Affiliations

Soon will be listed here.

Abstract

This study aimed to investigate the relationship between the muscle shear modulus of the biceps brachii, urinary titin N-terminal fragment (UTF), and other damage markers after eccentric exercise. Seventeen healthy males performed five sets of ten eccentric exercises with dumbbells weighing 50% of the maximum voluntary contraction (MVC) at the elbow joint. Muscle shear modulus with range of interest set to only biceps brachii muscle measured by ultrasound shear wave elastography, UTF, MVC, range of motion (ROM), and soreness (SOR) were recorded before, immediately after, and 1, 24, 48, 72, 96, and 168 h after eccentric exercise. Each marker changed in a time course pattern, as found in previous studies. The peak shear modulus showed a moderate negative correlation with peak MVC (r = -0.531, P < 0.05) and a strong positive correlation with peak UTF (r = 0.707, P < 0.01). Our study results revealed a significant relationship between muscle strength, shear modulus measured by ultrasound SWE, and titin measured by UTF, as a non-invasive damage marker after eccentric exercise to track changes in EIMD.

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