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Classification of pro-inflammatory status for interleukin-6 affects relative muscle strength in obese elderly women

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Abstract

Background

Obesity, defined by an excess amount of body fat or a percent body fat higher than 30 % for women is a complex chronic disorder with multifactorial etiology and is accompanied by chronic low-grade inflammation, which results in elevated pro-inflammatory cytokines.

Aims

The aim of this study was to compare muscle strength between high and low pro-inflammatory status in obese elderly women and to verify the relationship of IL-6 with muscle strength and fat-free mass.

Methods

Eighty-nine elderly women (age 69.47 ± 6.07 years; body mass 64.70 ± 12.04 kg; height 1.52 ± 0.06 m; body mass index 27.78 ± 4.75 kg/m2) were divided into two groups: high and low inflammatory status for IL-6. Lower limb muscle strength was tested using bilateral leg extension with the ten repetitions maximum test, IL-6 was measured by ELISA and body composition by dual-energy X-ray absorptiometry.

Results

Women classified from the high pro-inflammatory status presented lower relative muscle strength (P = 0.056) when compared with the low inflammatory status group, with no differences for absolute muscle strength (P = 0.18). There was a significant negative correlation of IL-6 with relative muscle strength (P = 0.03, R = −0.22) and a considerable trend toward significance (P = 0.06, R = −0.19) and negative association with fat-free mass (P = 0.84, R = −0.02).

Conclusions

This study provides insights that a high pro-inflammatory status in sedentary obese elderly women might impair muscle strength and negatively affect fat-free mass. Thus, elderly women classified with high pro-inflammatory status for IL-6 should receive further health care attention to prevent this deleterious condition.

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Acknowledgments

This research was supported by the National Council of Scientific and Technological Development—CNPq (483549/2011-8). The authors have no conflicts of interest that are directly relevant to the content of this manuscript. In addition, the first author wants to dedicate this paper to his family (Rita de Cassia and Nicolas Cunha).

Conflict of interest

The authors declare no conflict of interest in this paper.

Ethical approval

The study was approved by the Institutional Research Ethics Committee (protocol #035/2011). Study design and employed procedures are in accordance with ethical standards and the Declaration of Helsinki.

Informed consent

Informed consent was obtained from all individual participants included in the study.

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Correspondence to Dahan da Cunha Nascimento.

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da Cunha Nascimento, D., de Sousa, N.M.F., de Sousa Neto, I.V. et al. Classification of pro-inflammatory status for interleukin-6 affects relative muscle strength in obese elderly women. Aging Clin Exp Res 27, 791–797 (2015). https://doi.org/10.1007/s40520-015-0349-9

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  • DOI: https://doi.org/10.1007/s40520-015-0349-9

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