Determining changes in muscle size and architecture after exercise training: One site does not fit all

Document Type

Journal Article

Publication Title

Journal of Strength and Conditioning Research

Volume

38

Issue

4

First Page

787

Last Page

790

PubMed ID

38513182

Publisher

National Strength and Conditioning Association / Wolters Kluwer

School

School of Medical and Health Sciences

Funders

Edith Cowan University / Coordination of Improvement of Higher Education Personnel / National Council of Technological and Scientific Development (CNPq/Brazil)

Comments

Nunes, J. P., Blazevich, A. J., Schoenfeld, B. J., Kassiano, W., Costa, B. D. V., Ribeiro, A. S., . . . Cyrino, E. S. (2024). Determining changes in muscle size and architecture after exercise training: One site does not fit all. Journal of Strength and Conditioning Research, 38(4), 787-790. https://doi.org/10.1519/JSC.0000000000004722

Abstract

Nunes, JP, Blazevich, AJ, Schoenfeld, BJ, Kassiano, W, Costa, BDV, Ribeiro, AS, Nakamura, M, Nosaka, K, and Cyrino, ES. Determining changes in muscle size and architecture after exercise training: One site does not fit all. J Strength Cond Res 38(4): 787-790, 2024 - Different methods can be used to assess muscle hypertrophy, but the effects of training on regional changes in muscle size can be detected only using direct muscle measurements such as muscle thickness, cross-sectional area, or volume. Importantly, muscle size increases vary across regions within and between muscles after resistance training programs (i.e., heterogeneous, or nonuniform, muscle hypertrophy). Muscle architectural changes, including fascicle length and pennation angle, after resistance and stretch training programs are also region-specific. In this paper, we show that the literature indicates that a single-site measure of muscle shape does not properly capture the effects achieved after exercise training interventions and that conclusions concerning the magnitude of muscle adaptations can vary substantially depending on the muscle site to be examined. Thus, we propose that measurements of muscle size and architecture should be completed at multiple sites across regions between the agonist muscles within a muscle group and along the length of the muscles to provide an adequate picture of training effects.

DOI

10.1519/JSC.0000000000004722

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