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Insulin resistance is associated with skeletal muscle weakness in COPD.

Wells, CE; Polkey, MI; Baker, EH (2015) Insulin resistance is associated with skeletal muscle weakness in COPD. Respirology, 21 (4). pp. 689-696. ISSN 1440-1843 https://doi.org/10.1111/resp.12716
SGUL Authors: Baker, Emma Harriet

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Abstract

BACKGROUND AND OBJECTIVE: Quadriceps weakness is seen across all GOLD stages of COPD and is associated with increased morbidity and mortality. As quadriceps weakness is only weakly associated with FEV1 , mechanisms other than airflow obstruction are implicated. We tested the hypothesis that insulin resistance contributes to skeletal muscle weakness in people with stable COPD. METHODS: Fifty-one COPD patients (no exacerbations preceding 6 weeks, no rehabilitation preceding 3 months) without known diabetes mellitus underwent assessment of skeletal muscle, including measurement of quadriceps maximal voluntary contraction (QMVC). Physical activity was measured for 7 days using a multisensory biaxial accelerometer armband. Insulin resistance (HOMA2 IR) was calculated from fasting blood glucose and insulin concentrations. RESULTS: QMVC was 30 ± 13 kg (74 ± 25% predicted) and 16 (31%) participants had quadriceps weakness. There was a negative univariate correlation between HOMA2 IR and QMVC (r = -0.446, P = 0.002). HOMA2 IR was greater in people with quadriceps weakness (1.59 ± 0.99) than in those without (1.11 ± 0.55, P = 0.032). On multivariate analysis, with age, sex, weight, BODE index and step count per day included in the model, a one-unit increase in insulin resistance was associated with a 5.9 (2.0-9.8)-kg decrease in QMVC (P = 0.004) and a 4.2 (1.3-14.3)-fold increased risk of quadriceps weakness (P = 0.02). CONCLUSION: Insulin resistance is associated with skeletal muscle weakness in COPD, independent of potential confounders. Further studies are required to explore underlying mechanisms and determine whether insulin-sensitizing drugs could augment pulmonary rehabilitation in building skeletal muscle strength in COPD.

Item Type: Article
Additional Information: © 2015 Asian Pacific Society of Respirology
Keywords: Exercise, insulin resistance, muscle, obstructive pulmonary disease, skeletal, Respiratory System, 11 Medical And Health Sciences
SGUL Research Institute / Research Centre: Academic Structure > Infection and Immunity Research Institute (INII)
Journal or Publication Title: Respirology
ISSN: 1440-1843
Language: ENG
Dates:
DateEvent
18 December 2015Published
Publisher License: Publisher's own licence
PubMed ID: 26678022
Go to PubMed abstract
URI: https://openaccess.sgul.ac.uk/id/eprint/107745
Publisher's version: https://doi.org/10.1111/resp.12716

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