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Research

THE RELATIONSHIP BETWEEN SKELETAL MUSCLE MASS INDICES DETERMINED BY SEGMENTAL BIO- IMPEDANCE AND MUSCLE STRENGTH

8th Combined Meeting Of Orthopaedic Research Societies (CORS)



Abstract

Summary Statement

Bio-impedance analysis (BIA) provides a convenient method for the estimation of whole body and segmental measurement of skeletal muscle mass (SMM). BIA-measured SMM parameters may be effectively used for the normalisation of muscle strength and removing body-size dependence.

Introduction

Despite an increasing interest in using bio-impedance analysis (BIA) for the estimation of segmental skeletal muscle mass (SMM); existing data is sparse. On the other hand, there is a need for better understanding of the influence of SMM on gender-related differences in muscle strength. Using BIA technique, this study aimed to measure the SMM, determine its correlation with muscle strength, and examine its relation with gender-related differences in muscle strength.

Patients and Methods

Segmental and whole body SMM (3-segment electrode configuration) and maximum voluntary contraction in five distinct shoulder planes (forward flexion, abduction in scapular plane, abduction in coronal plane, and internal- and external rotation) were measured in 45 healthy participants (22 males, 23 females) with a mean age of 30.3 years. Independent t-tests and Pearson Correlation test were applied for comparative and correlational analysis, respectively.

Results

All muscle-related parameters including muscle volume, SMM, and SMM index were significantly different between men and women. There was a significant gender-related difference in the absolute shoulder strength but not after normalisation to SMM. A strong correlation was found between strength and SMM and in-between strength measurements.

Conclusion

BIA provided a convenient method for SMM estimation. SMM parameters may be effectively used for strength normalisation allowing comparisons of individuals with differing body masses. Strong correlations between SMM and muscle strength supported the use of BIA in assessing muscle size-strength relations and its applicability in muscle function assessments.