• Małgorzata Kołodziej and Kamila Czajka.
• Department of Biostructure, University School of Physical Education in Wroclaw, Wrocław, Poland. Electronic address: malgorzata.kolodziej@awf.wroc.pl.
• Nutrition. 2022 Apr 1; 96: 111568.

ObjectivesThe condition of skeletal muscles is a key marker of the nutritional status and function of an organism. It is necessary to monitor muscle quality in basic pediatric preventive health care, especially due to the increase in negative health behaviors during a pandemic. The aims of this study were to assess body composition and muscle strength as well as to analyze the relationship between muscle functional quality and impedance parameters in 6- and 7-y-old children.MethodsThe study involved 292 healthy 6- and 7-y-old children. Handgrip strength and bioimpedance parameters were measured. Body composition components, including appendicular skeletal muscle mass, were estimated. Handgrip strength in relation to the appendicular skeletal muscles mass was adopted as an indicator of the muscle functional quality. The relationship between the muscle quality index and impedance parameters was assessed by multiple regression.ResultsA 1-y age difference between the children differentiated not only basic somatic parameters, body composition, and handgrip strength, but also the electrical properties of the tissues. The relative difference in muscle mass between younger and older children was twice that of the muscle strength. A significant regression model of the muscle quality index was obtained, in which reactance and impedance phase angle were strong positive predictors. Adjusted fat mass negatively correlated with the muscle quality.ConclusionsReactance and phase angle are good indicators of the quality of appendicular skeletal muscle in healthy children and can be potentially used in pediatric preventive health care and screening.Copyright © 2021 Elsevier Inc. All rights reserved.

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