Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study

Ratanyoo Longrak; Watanya Jaidee

doi:10.54141/psbd.1822619

Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study

Abstract

Ultrasonography (US) was used as an alternative to magnetic resonance imaging (MRI). However, the correlations between US-derived biceps brachii muscle thickness (BBMT) and MRI-derived muscle cross-sectional area (BBCSA) across regions have not been explored. This study aimed to investigate correlations between BBCSA and BBMT in the proximal, middle, and distal regions, and between muscle size and muscle strength. Twenty healthy active males were recruited. Three specific regions of biceps brachii were assessed for BBCSA via MRI and for BBMT via US. One-repetition maximum (1RM) of preacher curl and maximum isometric strength (MIS) of dominant elbow flexor were tested. The moderate to strong correlations between BBMT and BBCSA were observed in every corresponding region from proximal to distal regions (r = 0.45, r = 0.52, r = 0.77, respectively). The moderate correlations were also observed between 1RM and ∑BBMT (r = 0.59) and between 1RM and ∑BBCSA (r = 0.65). Similarly, ∑BBMT and ∑BBCSA also correlated with MIS (r = 0.45 and r = 0.59, respectively). Furthermore, a moderate correlation was found between MIS and 1RM (r = 0.67). In conclusion, BBMT was reliable for estimating BBCSA. Muscle size was an independent determinant of muscle strength. Besides, dynamic and isometric strength measures correlated.

Keywords

Supporting Institution

Burapha University

Project Number

G-HS046/2566(C1)

Ethical Statement

All participants voluntarily read and signed a written informed consent. The research complied with the Declaration of Helsinki, and ethical approval was granted by the Institutional Review Board of Burapha University (Code: G-HS046/2566(C1).

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Details

Primary Language

English

Subjects

Physical Training and Sports, Exercise Physiology, Kinantropometri

Journal Section

Research Article

Authors

Ratanyoo Longrak ^*
0000-0001-6117-7617
Thailand

Watanya Jaidee This is me
0000-0002-8196-1107
Thailand

Early Pub Date

July 16, 2026

Publication Date

-

Submission Date

November 12, 2025

Acceptance Date

March 9, 2026

Published in Issue

Year 2026 Number: Advanced Online Publication

DOI

https://doi.org/10.54141/psbd.1822619

IZ

https://izlik.org/JA49SG49WN

Cite

RIS / Bibtex

APA

Longrak, R., & Jaidee, W. (2026). Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study. Pamukkale Journal of Sport Sciences, Advanced Online Publication. https://doi.org/10.54141/psbd.1822619

AMA

1.Longrak R, Jaidee W. Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study. Pamukkale J Sport Sci. 2026;(Advanced Online Publication). doi:10.54141/psbd.1822619

Chicago

Longrak, Ratanyoo, and Watanya Jaidee. 2026. “Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study”. Pamukkale Journal of Sport Sciences, no. Advanced Online Publication. https://doi.org/10.54141/psbd.1822619.

EndNote

Longrak R, Jaidee W (July 1, 2026) Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study. Pamukkale Journal of Sport Sciences Advanced Online Publication

IEEE

[1]R. Longrak and W. Jaidee, “Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study”, Pamukkale J Sport Sci, no. Advanced Online Publication, July 2026, doi: 10.54141/psbd.1822619.

ISNAD

Longrak, Ratanyoo - Jaidee, Watanya. “Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study”. Pamukkale Journal of Sport Sciences. Advanced Online Publication (July 1, 2026). https://doi.org/10.54141/psbd.1822619.

JAMA

1.Longrak R, Jaidee W. Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study. Pamukkale J Sport Sci. 2026. doi:10.54141/psbd.1822619.

MLA

Longrak, Ratanyoo, and Watanya Jaidee. “Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study”. Pamukkale Journal of Sport Sciences, no. Advanced Online Publication, July 2026, doi:10.54141/psbd.1822619.

Vancouver

1.Ratanyoo Longrak, Watanya Jaidee. Regional Biceps Brachii Muscle Thickness, Muscle Cross‐Sectional Area, One-Repetition Maximum, and Maximum Isometric Strength: The Cross-Sectional Correlational Study. Pamukkale J Sport Sci. 2026 Jul. 1;(Advanced Online Publication). doi:10.54141/psbd.1822619