Influence of muscle hypertrophy on the moment arm of the triceps brachii muscle

Norihide Sugisaki, Taku Wakahara, Koichiro Murata, Naokazu Miyamoto, Yasuo Kawakami, Hiroaki Kanehisa, Tetsuo Fukunaga

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Although the moment arm of the triceps brachii muscle has been shown to be associated with the muscle's anatomical cross-sectional area, whether training-induced muscle hypertrophy alters the moment arm of the muscle remains unexplored. Therefore, the current study aimed to examine this. Eleven men underwent a 12-week resistance training program for the triceps brachii muscle. The maximum muscle anatomical cross-sectional area (ACSA<inf>max</inf>), the moment arm of the triceps brachii muscle, and the anterior-posterior dimension of the olecranon were measured using a magnetic resonance imaging system before and after intervention. The ACSA<inf>max</inf> (33.6 ± 11.9%, P < .001) and moment arm (5.5 ± 4.0%, P = .001) significantly increased after training, whereas the anterior-posterior dimension of the olecranon did not change (P > .05). The change in moment arm was smaller than that expected from the relationship between the ACSA<inf>max</inf> and the moment arm before the intervention. The present results indicate that training-induced triceps brachii muscle hypertrophy could increase the muscle moment arm, but its impact can be small or negligible.

Original languageEnglish
Pages (from-to)111-116
Number of pages6
JournalJournal of Applied Biomechanics
Volume31
Issue number2
DOIs
Publication statusPublished - 2015 Apr 1

Fingerprint

Hypertrophy
Muscles
Olecranon Process
Resistance Training
Magnetic Resonance Imaging
Education

Keywords

  • Elbow
  • MRI
  • Muscle cross-sectional area
  • Resistance training

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Biophysics
  • Rehabilitation

Cite this

Sugisaki, N., Wakahara, T., Murata, K., Miyamoto, N., Kawakami, Y., Kanehisa, H., & Fukunaga, T. (2015). Influence of muscle hypertrophy on the moment arm of the triceps brachii muscle. Journal of Applied Biomechanics, 31(2), 111-116. https://doi.org/10.1123/JAB.2014-0126

Influence of muscle hypertrophy on the moment arm of the triceps brachii muscle. / Sugisaki, Norihide; Wakahara, Taku; Murata, Koichiro; Miyamoto, Naokazu; Kawakami, Yasuo; Kanehisa, Hiroaki; Fukunaga, Tetsuo.

In: Journal of Applied Biomechanics, Vol. 31, No. 2, 01.04.2015, p. 111-116.

Research output: Contribution to journalArticle

Sugisaki, N, Wakahara, T, Murata, K, Miyamoto, N, Kawakami, Y, Kanehisa, H & Fukunaga, T 2015, 'Influence of muscle hypertrophy on the moment arm of the triceps brachii muscle', Journal of Applied Biomechanics, vol. 31, no. 2, pp. 111-116. https://doi.org/10.1123/JAB.2014-0126
Sugisaki, Norihide ; Wakahara, Taku ; Murata, Koichiro ; Miyamoto, Naokazu ; Kawakami, Yasuo ; Kanehisa, Hiroaki ; Fukunaga, Tetsuo. / Influence of muscle hypertrophy on the moment arm of the triceps brachii muscle. In: Journal of Applied Biomechanics. 2015 ; Vol. 31, No. 2. pp. 111-116.
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