Muscle hardness of the triceps brachii before and after a resistance exercise session: A shear wave ultrasound elastography study

Ryota Akagi, Jun Tanaka, Tomofumi Shikiba, Hideyuki Takahashi

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Background: Muscle hardness indicates muscle condition, and its measurement before and after resistance exercise is essential for preventing resistance training-induced muscle injury. Purpose: To investigate muscle hardness of the triceps brachii (TB) before and immediately after a resistance exercise session involving the elbow extensors. Material and Methods: In 18 young men, muscle hardness of the long head of TB was measured at 50%, 60%, and 70% point along the length of the upper arm from the acromial process of the scapula to the lateral epicondyle of the humerus by using shear wave ultrasound elastography. At the same sites, muscle thickness of the long head of TB was also measured by ultrasonography. Resistance exercise was performed using a dumbbell with a mass adjusted to 80% of the one-repetition maximum. Results: Although the exercise-induced increase in muscle hardness was significant at all the regions, muscle hardness was significantly higher at 70% of the upper arm length than at the other regions before and after resistance exercise. The exercise-induced increase in muscle thickness was also significant, but the relative changes in muscle hardness before and after resistance exercise were not correlated with the corresponding relative changes in muscle thickness at each region. These results indicate the small effect of exercise-induced muscle swelling on exercise-induced changes in muscle hardness. Conclusion: We suggest that muscle damage and/or injury, particularly at the distal region of TB, should be carefully considered to safely perform resistance exercise.

Original languageEnglish
Pages (from-to)1487-1493
Number of pages7
JournalActa Radiologica
Volume56
Issue number12
DOIs
Publication statusPublished - 2015 Dec 1

Keywords

  • Elbow extensors
  • Muscle thickness
  • Shear modulus
  • Shear wave ultrasound elastography

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiological and Ultrasound Technology

Cite this

Muscle hardness of the triceps brachii before and after a resistance exercise session : A shear wave ultrasound elastography study. / Akagi, Ryota; Tanaka, Jun; Shikiba, Tomofumi; Takahashi, Hideyuki.

In: Acta Radiologica, Vol. 56, No. 12, 01.12.2015, p. 1487-1493.

Research output: Contribution to journalArticle

Akagi, Ryota ; Tanaka, Jun ; Shikiba, Tomofumi ; Takahashi, Hideyuki. / Muscle hardness of the triceps brachii before and after a resistance exercise session : A shear wave ultrasound elastography study. In: Acta Radiologica. 2015 ; Vol. 56, No. 12. pp. 1487-1493.
@article{56596733837a4af8b15714823cdb146c,
title = "Muscle hardness of the triceps brachii before and after a resistance exercise session: A shear wave ultrasound elastography study",
abstract = "Background: Muscle hardness indicates muscle condition, and its measurement before and after resistance exercise is essential for preventing resistance training-induced muscle injury. Purpose: To investigate muscle hardness of the triceps brachii (TB) before and immediately after a resistance exercise session involving the elbow extensors. Material and Methods: In 18 young men, muscle hardness of the long head of TB was measured at 50{\%}, 60{\%}, and 70{\%} point along the length of the upper arm from the acromial process of the scapula to the lateral epicondyle of the humerus by using shear wave ultrasound elastography. At the same sites, muscle thickness of the long head of TB was also measured by ultrasonography. Resistance exercise was performed using a dumbbell with a mass adjusted to 80{\%} of the one-repetition maximum. Results: Although the exercise-induced increase in muscle hardness was significant at all the regions, muscle hardness was significantly higher at 70{\%} of the upper arm length than at the other regions before and after resistance exercise. The exercise-induced increase in muscle thickness was also significant, but the relative changes in muscle hardness before and after resistance exercise were not correlated with the corresponding relative changes in muscle thickness at each region. These results indicate the small effect of exercise-induced muscle swelling on exercise-induced changes in muscle hardness. Conclusion: We suggest that muscle damage and/or injury, particularly at the distal region of TB, should be carefully considered to safely perform resistance exercise.",
keywords = "Elbow extensors, Muscle thickness, Shear modulus, Shear wave ultrasound elastography",
author = "Ryota Akagi and Jun Tanaka and Tomofumi Shikiba and Hideyuki Takahashi",
year = "2015",
month = "12",
day = "1",
doi = "10.1177/0284185114559765",
language = "English",
volume = "56",
pages = "1487--1493",
journal = "Acta radiologica (Stockholm, Sweden : 1987)",
issn = "0284-1851",
publisher = "SAGE Publications Ltd",
number = "12",

}

TY - JOUR

T1 - Muscle hardness of the triceps brachii before and after a resistance exercise session

T2 - A shear wave ultrasound elastography study

AU - Akagi, Ryota

AU - Tanaka, Jun

AU - Shikiba, Tomofumi

AU - Takahashi, Hideyuki

PY - 2015/12/1

Y1 - 2015/12/1

N2 - Background: Muscle hardness indicates muscle condition, and its measurement before and after resistance exercise is essential for preventing resistance training-induced muscle injury. Purpose: To investigate muscle hardness of the triceps brachii (TB) before and immediately after a resistance exercise session involving the elbow extensors. Material and Methods: In 18 young men, muscle hardness of the long head of TB was measured at 50%, 60%, and 70% point along the length of the upper arm from the acromial process of the scapula to the lateral epicondyle of the humerus by using shear wave ultrasound elastography. At the same sites, muscle thickness of the long head of TB was also measured by ultrasonography. Resistance exercise was performed using a dumbbell with a mass adjusted to 80% of the one-repetition maximum. Results: Although the exercise-induced increase in muscle hardness was significant at all the regions, muscle hardness was significantly higher at 70% of the upper arm length than at the other regions before and after resistance exercise. The exercise-induced increase in muscle thickness was also significant, but the relative changes in muscle hardness before and after resistance exercise were not correlated with the corresponding relative changes in muscle thickness at each region. These results indicate the small effect of exercise-induced muscle swelling on exercise-induced changes in muscle hardness. Conclusion: We suggest that muscle damage and/or injury, particularly at the distal region of TB, should be carefully considered to safely perform resistance exercise.

AB - Background: Muscle hardness indicates muscle condition, and its measurement before and after resistance exercise is essential for preventing resistance training-induced muscle injury. Purpose: To investigate muscle hardness of the triceps brachii (TB) before and immediately after a resistance exercise session involving the elbow extensors. Material and Methods: In 18 young men, muscle hardness of the long head of TB was measured at 50%, 60%, and 70% point along the length of the upper arm from the acromial process of the scapula to the lateral epicondyle of the humerus by using shear wave ultrasound elastography. At the same sites, muscle thickness of the long head of TB was also measured by ultrasonography. Resistance exercise was performed using a dumbbell with a mass adjusted to 80% of the one-repetition maximum. Results: Although the exercise-induced increase in muscle hardness was significant at all the regions, muscle hardness was significantly higher at 70% of the upper arm length than at the other regions before and after resistance exercise. The exercise-induced increase in muscle thickness was also significant, but the relative changes in muscle hardness before and after resistance exercise were not correlated with the corresponding relative changes in muscle thickness at each region. These results indicate the small effect of exercise-induced muscle swelling on exercise-induced changes in muscle hardness. Conclusion: We suggest that muscle damage and/or injury, particularly at the distal region of TB, should be carefully considered to safely perform resistance exercise.

KW - Elbow extensors

KW - Muscle thickness

KW - Shear modulus

KW - Shear wave ultrasound elastography

UR - http://www.scopus.com/inward/record.url?scp=84956707785&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84956707785&partnerID=8YFLogxK

U2 - 10.1177/0284185114559765

DO - 10.1177/0284185114559765

M3 - Article

C2 - 25422513

AN - SCOPUS:84956707785

VL - 56

SP - 1487

EP - 1493

JO - Acta radiologica (Stockholm, Sweden : 1987)

JF - Acta radiologica (Stockholm, Sweden : 1987)

SN - 0284-1851

IS - 12

ER -