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European Journal of Applied Physiology

, Volume 118, Issue 11, pp 2359–2366 | Cite as

Differences in elbow extensor muscle characteristics between resistance-trained men and women

  • Justin J. Merrigan
  • Jason B. White
  • Y. Eliot Hu
  • Jason D. Stone
  • Jonathan M. Oliver
  • Margaret T. Jones
Original Article

Abstract

Purpose

Muscular strength is suggested to be dependent upon muscle characteristics. Yet, sex-specific relationships of muscle characteristics to strength in the resistance-trained require investigation. Therefore, the purpose was to evaluate sex differences in muscle characteristics and isometric strength in the elbow extensors, as well as their respective associations.

Methods

Resistance-trained men (n = 15, mean ± SD 22 ± 4 years, 87.5 ± 12.8 kg, 16.9 ± 2.9% body fat) and women (n = 15, mean ± SD 25 ± 5 years, 59.3 ± 7.3 kg, 22.4 ± 4.2% body fat) were tested. B-mode ultrasound images assessed muscle thickness, pennation angle, and echo intensity. Muscle volume and fascicle length were estimated from previously validated equations. Maximal voluntary isometric contraction measured elbow extensors isometric strength. Independent samples t-tests and Fisher’s r-to-z test examined differences between sexes.

Results

Sex differences existed in all muscle characteristics (p < 0.05). Men’s absolute strength (27.86 ± 3.55 kg) was significantly greater than women (16.15 ± 3.15 kg), but no differences were noted when controlling for muscle volume (men 0.069 ± 0.017, women 0.077 ± 0.022 kg/cm3). Sex differences did not exist in the relationships of muscle characteristics to strength with muscle size having the largest correlations. However, the relationship between echo intensity and body fat was different in men (r = − 0.311) and women (r = 0.541, p = 0.0143).

Conclusions

Sex differences in isometric elbow extensor strength are eliminated when expressed relative to muscle volume. Relationships of echo intensity and body fat were different between men and women and may be indicative of greater adipose infiltration in women.

Keywords

Echo intensity Gender MVIC Strength Ultrasound 

Abbreviations

EI

Echo intensity

DXA

Dual energy X-ray absorptiometry

FL

Fascicle length

LBM

Lean body mass

LL

Limb length

MT

Muscle thickness

MV

Muscle volume

PA

Pennation angle

US

Ultrasound imaging

Notes

Acknowledgements

There was no funding received for this work, nor relationships with companies or manufacturers who will benefit from the results of this study.

Author contributions

JM and MJ conceived and designed research. JM, JW, and EH conducted experiments. JO, JW, and JS analyzed data. JM, MJ, JW wrote the manuscript. All authors read and approved the manuscript.

Compliance with ethical standards

Conflict of interest

The authors have no conflict of interest.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Division of Health and Human PerformanceGeorge Mason UniversityManassasUSA
  2. 2.Center for Sports PerformanceGeorge Mason UniversityFairfaxUSA
  3. 3.Exercise and Sport Performance LaboratoryTexas Christian UniversityFort WorthUSA

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