Abstract
Aims
Conflicting results have been reported on the association of fat-free mass (FFM) and insulin resistance (IR). This study sought to test the association of FFM and IR by indexing FFM to avoid collinearity with fat mass.
Methods
This cross-sectional study comprised 11,284 volunteers, aged 38–79 years. Body composition was assessed by multi-frequency bioelectrical impedance. FFM indexed to body surface area (FFMbsa) was calculated. IR and impaired glucose tolerance (IGT) were estimated with homeostatic model assessment of insulin resistance index (HOMA-IR) and 2-h oral glucose tolerance test (2h-OGTT), respectively.
Results
Percent body fat decreased from the 1st to the 5th quintile of FFMbsa in both women (Eta2 = 0.166) and men (Eta2 = 0.133). In women, fasting insulin (Eta2 = 0.002), glucose (Eta2 = 0.006), and HOMA-IR (Eta2 = 0.007) increased slightly, but 2-h plasma glucose (2-h PG) was similar across the quintiles of FFMbsa. In men, fasting insulin and HOMA-IR were similar across the quintiles of FFMbsa, whereas fasting glucose increased slightly (Eta2 = 0.002) and 2-h PG decreased (Eta2 = 0.005) toward the highest quintile of FFMbsa. The higher the odds ratio for IR, the greater the FFMbsa in both sexes. Differently, FFMbsa did not affect the odds of IGT in women, while in men the odds ratio for IGT was lower in the 5th quintile compared with the 1st quintile of FFMbsa.
Conclusions
Higher odds of IR associated with greater FFMbsa contrasted with lower odds of IGT associated with greater FFMbsa. IR may be misdiagnosed by HOMA-IR in adults with greater fat-free mass.
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Availability of supporting data
The data sets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
Abbreviations
- FFM:
-
Fat-free mass
- IR:
-
Insulin resistance
- FFMbsa:
-
Fat-free mass indexed to body surface area
- HOMA-IR:
-
Homeostasis model assessment-insulin resistance
- 2-h PG:
-
2-h plasma glucose
- IGT:
-
Impaired glucose tolerance
- 2h-OGTT:
-
2-h oral glucose tolerance test
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Acknowledgements
The authors thank all volunteers for their important contribution.
Funding
This study was funded by Brazilian Ministry of Health (Department of Science and Technology) and Ministry of Science, Technology and Innovation (FINEP, Financiadora de Estudos e Projetos), Grants No. 01 06 0010.00, 01 06 0212.00, 01 06 0300.00, 01 06 0278.00, 01 06 0115.00 and 01 06 0071.00 and CNPq (the National Council for Scientific and Technological Development).
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DZ and ROA were involved in the conception and drafting of the manuscript. RHG, IMB, and SMB acquired and interpreted the data. PAL and JGM were involved in the final approval of the manuscript.
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Ethical approval was obtained from the Ethics Committee of the six affiliated institutions. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Zaniqueli, D., de Oliveira Alvim, R., Griep, R.H. et al. Insulin resistance may be misdiagnosed by HOMA-IR in adults with greater fat-free mass: the ELSA-Brasil Study. Acta Diabetol 58, 73–80 (2021). https://doi.org/10.1007/s00592-020-01594-6
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DOI: https://doi.org/10.1007/s00592-020-01594-6