Training-induced changes in muscle architecture and specific tension

Yasuo Kawakami, T. Abe, S. Y. Kuno, T. Fukunaga

Research output: Contribution to journalArticle

202 Citations (Scopus)

Abstract

Five men underwent unilateral resistance training of elbow extensor (triceps brachii) muscles for 16 weeks. Before and after training, muscle layer thickness and fascicle angles of the long head of the triceps muscle were measured in vivo using B-mode ultrasound, and fascicle lengths were estimated. Series anatomical cross-sectional areas (ACSA) of the triceps brachii muscle were measured by magnetic resonance imaging, from which muscle volume (V(m)) was determined and physiological cross-sectional area (PCSA) was calculated. Elbow extension strength (isometric; concentric and eccentric at 30, 90 and 180°.s-1) was measured using an isokinetic dynamometer to determine specific tension. Muscle volumes, ACSA, PCSA, muscle layer thickness and fascicle angles increased after training and their relative changes were similar, while muscle and fascicle length did not change. Muscle strength increased at all velocities; however, specific tension decreased after training. Increase in fascicle angles, which would be the result of increased V(m) and PCSA, would seem to imply the occurrence of changes in muscle architecture. This might have given a negative effect on the force-generating properties of the muscles.

Original languageEnglish
Pages (from-to)37-43
Number of pages7
JournalEuropean Journal of Applied Physiology and Occupational Physiology
Volume72
Issue number1-2
DOIs
Publication statusPublished - 1995
Externally publishedYes

Fingerprint

Muscles
Elbow
Resistance Training
Muscle Strength
Magnetic Resonance Imaging

Keywords

  • Muscle hypertrophy
  • Pennation angle
  • Physiological cross-sectional area

ASJC Scopus subject areas

  • Physiology
  • Public Health, Environmental and Occupational Health

Cite this

Training-induced changes in muscle architecture and specific tension. / Kawakami, Yasuo; Abe, T.; Kuno, S. Y.; Fukunaga, T.

In: European Journal of Applied Physiology and Occupational Physiology, Vol. 72, No. 1-2, 1995, p. 37-43.

Research output: Contribution to journalArticle

@article{a2952620abbd4d2c851c2917e4c3e969,
title = "Training-induced changes in muscle architecture and specific tension",
abstract = "Five men underwent unilateral resistance training of elbow extensor (triceps brachii) muscles for 16 weeks. Before and after training, muscle layer thickness and fascicle angles of the long head of the triceps muscle were measured in vivo using B-mode ultrasound, and fascicle lengths were estimated. Series anatomical cross-sectional areas (ACSA) of the triceps brachii muscle were measured by magnetic resonance imaging, from which muscle volume (V(m)) was determined and physiological cross-sectional area (PCSA) was calculated. Elbow extension strength (isometric; concentric and eccentric at 30, 90 and 180°.s-1) was measured using an isokinetic dynamometer to determine specific tension. Muscle volumes, ACSA, PCSA, muscle layer thickness and fascicle angles increased after training and their relative changes were similar, while muscle and fascicle length did not change. Muscle strength increased at all velocities; however, specific tension decreased after training. Increase in fascicle angles, which would be the result of increased V(m) and PCSA, would seem to imply the occurrence of changes in muscle architecture. This might have given a negative effect on the force-generating properties of the muscles.",
keywords = "Muscle hypertrophy, Pennation angle, Physiological cross-sectional area",
author = "Yasuo Kawakami and T. Abe and Kuno, {S. Y.} and T. Fukunaga",
year = "1995",
doi = "10.1007/BF00964112",
language = "English",
volume = "72",
pages = "37--43",
journal = "European Journal of Applied Physiology",
issn = "1439-6319",
publisher = "Springer Verlag",
number = "1-2",

}

TY - JOUR

T1 - Training-induced changes in muscle architecture and specific tension

AU - Kawakami, Yasuo

AU - Abe, T.

AU - Kuno, S. Y.

AU - Fukunaga, T.

PY - 1995

Y1 - 1995

N2 - Five men underwent unilateral resistance training of elbow extensor (triceps brachii) muscles for 16 weeks. Before and after training, muscle layer thickness and fascicle angles of the long head of the triceps muscle were measured in vivo using B-mode ultrasound, and fascicle lengths were estimated. Series anatomical cross-sectional areas (ACSA) of the triceps brachii muscle were measured by magnetic resonance imaging, from which muscle volume (V(m)) was determined and physiological cross-sectional area (PCSA) was calculated. Elbow extension strength (isometric; concentric and eccentric at 30, 90 and 180°.s-1) was measured using an isokinetic dynamometer to determine specific tension. Muscle volumes, ACSA, PCSA, muscle layer thickness and fascicle angles increased after training and their relative changes were similar, while muscle and fascicle length did not change. Muscle strength increased at all velocities; however, specific tension decreased after training. Increase in fascicle angles, which would be the result of increased V(m) and PCSA, would seem to imply the occurrence of changes in muscle architecture. This might have given a negative effect on the force-generating properties of the muscles.

AB - Five men underwent unilateral resistance training of elbow extensor (triceps brachii) muscles for 16 weeks. Before and after training, muscle layer thickness and fascicle angles of the long head of the triceps muscle were measured in vivo using B-mode ultrasound, and fascicle lengths were estimated. Series anatomical cross-sectional areas (ACSA) of the triceps brachii muscle were measured by magnetic resonance imaging, from which muscle volume (V(m)) was determined and physiological cross-sectional area (PCSA) was calculated. Elbow extension strength (isometric; concentric and eccentric at 30, 90 and 180°.s-1) was measured using an isokinetic dynamometer to determine specific tension. Muscle volumes, ACSA, PCSA, muscle layer thickness and fascicle angles increased after training and their relative changes were similar, while muscle and fascicle length did not change. Muscle strength increased at all velocities; however, specific tension decreased after training. Increase in fascicle angles, which would be the result of increased V(m) and PCSA, would seem to imply the occurrence of changes in muscle architecture. This might have given a negative effect on the force-generating properties of the muscles.

KW - Muscle hypertrophy

KW - Pennation angle

KW - Physiological cross-sectional area

UR - http://www.scopus.com/inward/record.url?scp=0029589718&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0029589718&partnerID=8YFLogxK

U2 - 10.1007/BF00964112

DO - 10.1007/BF00964112

M3 - Article

C2 - 8789568

AN - SCOPUS:0029589718

VL - 72

SP - 37

EP - 43

JO - European Journal of Applied Physiology

JF - European Journal of Applied Physiology

SN - 1439-6319

IS - 1-2

ER -