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. 2023 May 22;23(10):4960.
doi: 10.3390/s23104960.

Prediction of the Physical Activity Level of Community-Dwelling Older Japanese Adults with a Triaxial Accelerometer Containing a Classification Algorithm for Ambulatory and Non-Ambulatory Activities

Shigeho Tanaka  1   2   3 , Kazuko Ishikawa-Takata  3   4 , Satoshi Nakae  5 , Satoshi Sasaki  6
Affiliations

Prediction of the Physical Activity Level of Community-Dwelling Older Japanese Adults with a Triaxial Accelerometer Containing a Classification Algorithm for Ambulatory and Non-Ambulatory Activities

Shigeho Tanaka et al. Sensors (Basel). .

Abstract

Accurate methods for the prediction of the total energy expenditure and physical activity level (PAL) in community-dwelling older adults have not been established. Therefore, we examined the validity of estimating the PAL using an activity monitor (Active style Pro HJA-350IT, [ASP]) and proposed correction formulae for such populations in Japan. Data for 69 Japanese community-dwelling adults aged 65 to 85 years were used. The total energy expenditure in free-living conditions was measured with the doubly labeled water method and the measured basal metabolic rate. The PAL was also estimated from metabolic equivalent (MET) values obtained with the activity monitor. Adjusted MET values were also calculated with the regression equation of Nagayoshi et al. (2019). The observed PAL was underestimated, but significantly correlated, with the PAL from the ASP. When adjusted using the Nagayoshi et al. regression equation, the PAL was overestimated. Therefore, we developed regression equations to estimate the actual PAL (Y) from the PAL obtained with the ASP for young adults (X) as follows: women: Y = 0.949 × X + 0.205, mean ± standard deviation of the prediction error = 0.00 ± 0.20; men: Y = 0.899 × X + 0.371, mean ± standard deviation of the prediction error = 0.00 ± 0.17.

Keywords: accelerometer; community-dwelling older adults; doubly labeled water; physical activity level; total energy expenditure.

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Conflict of interest statement

Shigeho Tanaka received consigned research funds from Omron Healthcare Co., Ltd. The remaining authors do not have any relevant financial interests to disclose related to this research. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript; or in the decision to publish the results.

Figures

Figure 1
Figure 1
Relationship between measured and predicted PAL by the ASP without adjustment. Red closed circle and dotted regression line: women. Blue closed triangle and dotted regression line: men. Black dotted line: identity line.
Figure 2
Figure 2
Relationship between measured and predicted PAL by the ASP adjusted with the regression equation of Nagayoshi et al. [15]. Red closed circle and dotted regression line: women. Blue closed triangle and dotted regression line: men. Black dotted line: identity line.
See this image and copyright information in PMC

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