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Nicotine Tob Res. 2019 May 15. pii: ntz081. doi: 10.1093/ntr/ntz081. [Epub ahead of print]

Cigarette smoking is associated with lower quadriceps cross-sectional area and attenuation in older adults.

Author information

1
National Institute on Aging, Intramural Research Program, Laboratory of Epidemiology and Population Sciences, Bethesda, MD, USA.
2
Research Center in Sports Sciences, Health Sciences and Human Development, CIDESD, University Institute of Maia, ISMAI, Portugal.
3
Clinical Research Institute & Department of Internal Medicine, American University of Beirut, Beirut, Lebanon.
4
College of Kinesiology, University of Saskatchewan, Saskatoon, Canada.
5
Icelandic Heart Association Research Institute, Kópavogur, Iceland.
6
University of Iceland, Reykjavik, Iceland.
7
Landspitalinn University Hospital, Reykjavik, Iceland.
8
Department of Radiology and Biomedical Imaging, University of California, San Francisco, CA, USA.
9
Centre of Public Health Sciences, University of Iceland, Reykjavik, Iceland.

Abstract

INTRODUCTION:

In addition to well-established links with cardiovascular and respiratory diseases, cigarette smoking may affect skeletal muscle; however, associations with quadriceps atrophy, density, and function are unknown. This study explored the associations of current and former smoking with quadriceps muscle area and attenuation as well as muscle force (assessed as knee extension peak torque) and rate of torque development (RTD) - a measure of muscle power in older adults.

METHODS:

Data from 4469 older adults, aged 66-95 years at baseline in the Age, Gene/Environment Susceptibility - Reykjavik Study with measurements of thigh computed tomography, isometric knee extension testing, self-reported smoking history and potential covariates were analyzed.

RESULTS:

Sex-differences were observed in these data, therefore our final analyses are stratified by sex. In men, both former smokers and current smokers had lower muscle area (with = -0.10, 95% CI -0.17, -0.03 and = -0.19, 95% CI -0.33, -0.05, respectively) and lower muscle attenuation (i.e., higher fat infiltration, = -0.08, 95% CI -0.16, -0.01 and = -0.17, 95% CI -0.34, -0.01, respectively) when compared to never-smokers. Smoking status was not associated with male peak torque or RTD. In women, current smoking was associated with lower muscle attenuation (= -0.24, 95% CI -0.34, -0.13) compared to never-smoking. Among female smokers (current and former), muscle attenuation and peak torque were lower with increasing pack-years.

CONCLUSIONS:

Results suggest that cigarette smoking is related to multiple muscle properties at older age and that these relationships may be different among men and women.

IMPLICATIONS:

This manuscript presents novel data, as it examined for the first time the relationship between smoking and computed tomography-derived quadriceps muscle size (cross-sectional area) and attenuation.This study suggests that current cigarette smoking is related to higher muscle fat infiltration, which may have significant health implications for the older population, due to its known association with poor physical function, falls, and hip fractures.

PMID:
31091312
DOI:
10.1093/ntr/ntz081

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