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Effect of age on shear modulus, muscle thickness, echo intensity of the upper limb, lower limb, and trunk muscles in healthy women

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Abstract

Purpose

This study aimed to examine the effect of age on the mechanical properties, muscle size, and muscle quality in the upper and lower limb and trunk muscles.

Methods

We evaluated the shear modulus (G), muscle thickness (MT), and echo intensity (EI) of the upper and lower limb and trunk muscles of 83 healthy women (21–83-year-old). The G values of some limb muscles were measured in relaxed and stretched positions.

Results

Regarding the effect of age on G at the distinct positions, the G of the upper limb muscles were not significantly correlated with age in the relaxed and stretched positions. In contrast, the G of the iliacus showed a significant negative correlation in both positions. Additionally, the G of the rectus femoris had a significant negative correlation only in the relaxed position. Regarding differences among body parts, the G of the lower limb and oblique abdominal muscles showed a significant negative correlation, but no correlation in the upper limb, rectus abdominis, and back muscles. Moreover, MT showed a significant negative correlation with age in the lower limb, abdominal, and erector spinae muscles, but no correlation was detected in the upper limb and lumbar multifidus muscles. EI had a significant positive correlation in all the muscles.

Conclusion

The effect of age on G depended on body parts, and the G of the lower limb and oblique abdominal muscles negatively associated with age. Additionally, G in the relaxed position may be more susceptible to aging than G in the stretched position.

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Availability of data and material

Data not available due to ethical restrictions.

Code availability

Not applicable.

Abbreviations

G:

Shear modulus

MT:

Muscle thickness

EI:

Echo intensity

SSP:

Supraspinatus

ISP:

Infraspinatus

DT:

Middle part of the deltoid

BB:

Long head of the biceps brachii

UT:

Upper trapezius

PM:

Clavicular region of the pectoralis major

Pm:

Pectoralis minor

IL:

Iliacus

RF:

Rectus femoris

GM:

Gluteus maximus

BF:

Biceps femoris

RA:

Rectus abdominis

EO:

External oblique

IO:

Internal oblique

TrA:

Transverse abdominis

ThEL:

Thoracic erector spinae

LEL:

Lumbar erector spinae

MF:

Lumbar multifidus

ROI:

Region of interest

V:

Shear wave velocity

ρ:

Muscle density

ICC:

Intraclass correlation coefficient

References

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Acknowledgements

We would like to thank Ms. Itsuda and Ms. Nakazato for data collection and Ms. Ibuki and Editage (www.editage.jp) for their assistance with the English language editing.

Funding

This study was supported by a joint research fund from the Wacoal Holdings Corporation.

Author information

Authors and Affiliations

Authors

Contributions

All authors have made substantial contributions to the conception and design of the study, collection, analysis, or interpretation of data. Moreover, all authors revised the manuscript critically for important intellectual content and read and approved the final manuscript.

The specific contributions of the authors are as follows:

Study conception and design: KK, MY, HT, JU, NI. Acquisition of data: KK, MY, HS, SO. Analysis and interpretation of data: KK, MY, HT, MO, JU, NI. Drafting the paper or critical revision: KK, MY, HT, MO, JU, HS, SO, NI.

Corresponding author

Correspondence to Kotono Kobayashi.

Ethics declarations

Conflict of interest

The authors declare no conflict of interest.

Ethical approval (include appropriate approvals or waivers)

All procedures were approved by the Ethics Committee of the Kyoto University Graduate School and Faculty of Medicine (R1674).

Consent to participate and consent for publication

Prior to this study, the procedures and goals of the study were explained to all participants, who then provided written informed consent.

Additional information

Communicated by Olivier Seynnes.

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Cite this article

Kobayashi, K., Yagi, M., Tateuchi, H. et al. Effect of age on shear modulus, muscle thickness, echo intensity of the upper limb, lower limb, and trunk muscles in healthy women. Eur J Appl Physiol 123, 797–807 (2023). https://doi.org/10.1007/s00421-022-05099-8

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  • DOI: https://doi.org/10.1007/s00421-022-05099-8

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