Relationships between muscle strength and indices of muascle cross-sectional area determined during maximal voluntary contraction in middle-aged and elderly individuals

Ryota Akagi, Yohei Tarai, Emika Kato, Makoto Fukuda, Taku Wakahara, Megumi Ohta, Hiroaki Kanehisa, Yasuo Kawakami, Tetsuo Fukunaga

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Akagi, R, Takai, Y, Kato, E, Fukuda, M, Wakahara, T, Ohta, M, Kanehisa, H, Kawakami, Y, and Fukunaga, T. Relationships between muscle strength and indices of muscle cross-sectional area determined during maximal voluntary contraction in middleaged and elderly individuals. J Strength Cond Res 23(4): 1258-1262, 2009-The present study examined how muscle crosssectional area (CSA) indices determined at rest and during maximal voluntary contraction (MVC) are related to muscle strength in middle-aged and elderly individuals (22 men and 36 women, 51-77 years). The muscle thickness (MT) of elbow flexors and circumference (C) at the level 60% distal to the upper arm was measured by ultrasonography and a measuring tape, respectively, both at rest and during isometric MVC of elbow flexion. The muscle strength (F) of elbow flexors was calculated by dividing the torque developed during MVC by the forearm length of each subject. The product of MT and C (MTxC) and the square of MT (MT2) were defined as the muscle CSA indices. The F was significantly correlated with MTXC during MVC (r = 0.905, p ≤ 0.001) and at rest (r = 0.778, p ≤ 0.001), with the former relationship significantly stronger than the latter (p ≤ 0.001). Similarly, F was significantly correlated with MT2 both during MVC (r = 0.896, p≤ 0.001) and at rest (r= 0.780, p ≤ 0.001), and there was also a significant difference between the correlation coefficients (p ≤ 0.01). These findings show that, in middle-aged and elderly individuals, muscle strength is more closely related to muscle CSA indices during MVC than at rest. It is concluded that the present muscle CSA indices taken during MVC enable easy and practical evaluation of the muscle strength per size of elbow flexors in middle-aged and elderly individuals.

Original languageEnglish
Pages (from-to)1258-1262
Number of pages5
JournalJournal of Strength and Conditioning Research
Volume23
Issue number4
DOIs
Publication statusPublished - 2009 Jul
Externally publishedYes

Keywords

  • Circumference
  • Elbow flexors
  • Maximal isometric contraction
  • Measuring tape
  • Muscle thickness
  • Ultrasonography

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

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