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ORIGINAL ARTICLE: BIOLOGY

Comparative analysis of the maximal respiratory pressure and peak expiratory flow rate in diagnosing probable respiratory sarcopenia – The Otassha Study

Takeshi Kera

Corresponding Author

Takeshi Kera

Department of Physical Therapy, Takasaki University of Health and Welfare, Gunma, Japan

Research Team for Human Care, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

Correspondence

Takeshi Kera PT PhD, Takasaki University of Health and Welfare, 501 Nakaorui-machi, Takasaki, Gunma 370-0033, Japan.

Email: [email protected]

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Hisashi Kawai

Hisashi Kawai

Research Team for Human Care, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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Manami Ejiri

Manami Ejiri

Research Team for Human Care, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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Keigo Imamura

Keigo Imamura

Research Team for Human Care, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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Hirohiko Hirano

Hirohiko Hirano

Research Team for Promoting Independence and Mental Health, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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Yoshinori Fujiwara

Yoshinori Fujiwara

Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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Kazushige Ihara

Kazushige Ihara

Department of Social Medicine, Hirosaki University School of Medicine, Aomori, Japan

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Shuichi Obuchi

Shuichi Obuchi

Research Team for Human Care, Tokyo Metropolitan Institute for Geriatrics and Gerontology, Tokyo, Japan

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First published: 21 July 2025

Abstract

Aim

The availability of diverse assessment methods, based on different devices and conditions, for respiratory sarcopenia is crucial for developing community health initiatives. Thus, in this study, we aimed to compare the concordance in diagnosing respiratory sarcopenia based on the maximal respiratory pressure (MRP) and peak expiratory flow rate (PEFR), which are specific indicators of respiratory-muscle strength, in a community-dwelling older adult population.

Methods

In the Otassha Study conducted in 2023, 499 community-dwelling adults aged >65 years in Itabashi Ward (184 men and 315 women) were evaluated for MRP, PEFR, walking speed, grip strength, and appendicular skeletal muscle mass (ASM). We determined two respiratory-sarcopenia models using low skeletal muscle mass and low MRP/PEFR (both <80% for predicted values). Pearson correlation coefficients were used to compare each measurement; the agreement between respiratory sarcopenia diagnosed using low MRP and PEFR was evaluated using kappa coefficients (κ).

Results

PEFR was correlated with MRP (maximal expiratory pressure: r = 0.415; maximal inspiratory pressure: r = 0.380; P < 0.01, respectively). A moderate level of agreement was found between respiratory sarcopenia diagnosed using MRP and that diagnosed using PEFR (κ = 0.597, match rate = 87.2%), suggesting a fair consistency level between the methods.

Conclusions

Although PEFR had a moderate correlation with MRP, the concordance of respiratory sarcopenia diagnosed using the two methods was moderate, suggesting that the two approaches are partially interchangeable and are complementary. The findings showed that PEFR, proposed as an alternative to MRP, is valid for diagnosing respiratory sarcopenia, supporting its role as an alternative to the gold standard for evaluating respiratory-muscle strength. Geriatr Gerontol Int 2025; ••: ••–••.

Data Availability Statement

Research data are not shared.

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