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Identification of skeletal muscle mass depletion across age and BMI groups in health and disease—there is need for a unified definition

International Journal of Obesity volume 39, pages 379–386 (2015)Cite this article

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Abstract

Although reduced skeletal muscle mass is a major predictor of impaired physical function and survival, it remains inconsistently diagnosed to a lack of standardized diagnostic approaches that is reflected by the variable combination of body composition indices and cutoffs. In this review, we summarized basic determinants of a normal lean mass (age, gender, fat mass, body region) and demonstrate limitations of different lean mass parameters as indices for skeletal muscle mass. A unique definition of lean mass depletion should be based on an indirect or direct measure of skeletal muscle mass normalized for height (fat-free mass index (FFMI), appendicular or lumbal skeletal muscle index (SMI)) in combination with fat mass. Age-specific reference values for FFMI or SMI are more advantageous because defining lean mass depletion on the basis of total FFMI or appendicular SMI could be misleading in the case of advanced age due to an increased contribution of connective tissue to lean mass. Mathematical modeling of a normal lean mass based on age, gender, fat mass, ethnicity and height can be used in the absence of risk-defined cutoffs to identify skeletal muscle mass depletion. This definition can be applied to identify different clinical phenotypes like sarcopenia, sarcopenic obesity or cachexia.

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Acknowledgements

The studies by the authors were funded by a grant of the Germany Ministry of Education and Research (BMBF 0315681), the German Research Foundation (DFG Bo 3296/1-1) and the BMBF Kompetenznetz Adipositas, Core domain ‘Body composition’ (Körperzusammensetzung; FKZ 01GI1125).

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Authors and Affiliations

  1. Institute of Nutritional Medicine, University Hohenheim, Stuttgart, Germany

    A Bosy-Westphal

  2. Institute of Human Nutrition and Food Science, Christian-Albrechts-University of Kiel, Kiel, Germany

    A Bosy-Westphal & M J Müller

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Correspondence to A Bosy-Westphal.

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Bosy-Westphal, A., Müller, M. Identification of skeletal muscle mass depletion across age and BMI groups in health and disease—there is need for a unified definition. Int J Obes 39, 379–386 (2015). https://doi.org/10.1038/ijo.2014.161

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