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

7 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

Keywords

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

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Biophysics
  • Rehabilitation

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