Key summary points
To examine the effect of cumulative smoking exposure on the association between peak expiratory flow rate (PEFR) and skeletal muscle mass in middle-aged and older adults.
AbstractSection FindingsThe skeletal muscle mass progressively reduced with decreasing PEFR levels in individuals with non-smoking and light-to-moderate smoking exposure. However, the association between low PEFR level and reduced skeletal muscle mass was not clearly observed in individuals with heavy smoking exposure.
AbstractSection MessageAlthough decreased PEFR in the older population is associated with the age-related loss of systemic skeletal muscle mass, smoking exposure levels of individuals should be taken into consideration when using PEFR as an indicator of sarcopenia.
Abstract
Purpose
This study aimed to examine whether cumulative smoking exposure affects the association between peak expiratory flow rate (PEFR) and skeletal muscle mass in middle-aged and older adults.
Methods
The study participants comprised 832 community-dwelling individuals aged 50–89 years (mean age: 69 years) without chronic obstructive pulmonary disease. Bioelectrical impedance analysis was performed to estimate the skeletal muscle mass of each participant. PEFR was assessed using an electronic spirometer. Cumulative smoking exposure was expressed in pack years, that is a product of the average number of packs of cigarettes smoked per day and smoking duration in years.
Results
The whole-body skeletal muscle mass progressively reduced with decreasing PEFR levels in both males and females. In the multiple regression analysis, PEFR was found to be significantly associated with skeletal muscle mass, independent of the potential confounding factors. When participants were stratified based on the cumulative smoking exposure, the association between low PEFR and reduced skeletal muscle mass persisted in individuals with non-smoking and light-to-moderate smoking exposure (< 30 pack-years). However, this association was not clearly observed in individuals with heavy smoking exposure (≥ 30 pack-years).
Conclusion
The findings of this study support the notion that PEFR declines with a reduction in systemic skeletal muscle mass due to aging. However, chronic cigarette smoking induces respiratory dysfunction exceeding the expected values by age, and thus a low PEFR level may not be used as a marker of reduced muscle mass in older adults exposed to heavy smoking.
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Data availability
The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was supported by the Japan Society for the Promotion of Science Grant-in-Aid for Scientific Research (JSPS KAKENHI; Grant number: 17K01861).
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EN and NM contributed to the study design, data collection, statistical analysis, interpretation, drafting, and final revision of the manuscript. YZ, SO, and MS contributed to the data collection and drafting of the manuscript. MU and MA contributed to the conception and design of the work and the final revision of the manuscript.
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The authors declared that they have no potential conflicts of interest with respect to the research, research, authorship, and /or publication of this article.
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All procedures performed in this study were approved by the ethical committee of Wakayama Medical University (approval numbers: G92 and 2975).
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Written informed consent and clearance for the use of examination data were obtained from the participants after explaining the purpose of the study and the experimental procedure.
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Nogami, E., Miyai, N., Zhang, Y. et al. Effects of cigarette smoking on the association between respiratory muscle strength and skeletal muscle mass in middle-aged and older adults: the Wakayama Study. Eur Geriatr Med 13, 805–815 (2022). https://doi.org/10.1007/s41999-022-00662-0
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DOI: https://doi.org/10.1007/s41999-022-00662-0