Evaluation of low-intensity physical activity by triaxial accelerometry.

Evaluation of low-intensity physical activity by triaxial accelerometry. Research Abstract Details 

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Evaluation of low-intensity physical activity by triaxial accelerometry. Abstract Text:

Taishi Midorikawa,Shigeho Tanaka,Kayoko Kaneko,Kayo Koizumi,Kazuko Ishikawa-Takata,Jun Futami,Izumi Tabata,Taishi Midorikawa,Shigeho Tanaka,Kayoko Kaneko,Kayo Koizumi,Kazuko Ishikawa-Takata,Jun Futami,Izumi Tabata,Taishi Midorikawa,Shigeho Tanaka,Kayoko Kaneko,Kayo Koizumi,Kazuko Ishikawa-Takata,Jun Futami,Izumi Tabata,

OBJECTIVE: To develop regression-based equations that estimate physical activity ratios [energy expenditure (EE) per minute/sleeping metabolic rate] for low-to-moderate intensity activities using total acceleration obtained by triaxial accelerometry. RESEARCH METHODS AND PROCEDURES: Twenty-one Japanese adults were fitted with a triaxial accelerometer while also in a whole-body human calorimeter for 22.5 hours. The protocol time was composed of sleep (8 hours), four structured activity periods totaling 4 hours (sitting, standing, housework, and walking on a treadmill at speeds of 71 and 95 m/min, 2 x 30 minutes for each activity), and residual time (10.5 hours). Acceleration data (milligausse) from the different periods and their relationship to physical activity ratio obtained from the human calorimeter allowed for the development of EE equations for each activity. The EE equations were validated on the residual times, and the percentage difference for the prediction errors was calculated as (predicted value - measured value)/measured value x 100. RESULTS: Using data from triaxial accelerations and the ratio of horizontal to vertical accelerations, there was relatively high accuracy in identifying the four different periods of activity. The predicted EE (882 +/- 150 kcal/10.5 hours) was strongly correlated with the actual EE measured by human calorimetry (846 +/- 146 kcal/10.5 hours, r = 0.94 p < 0.01), although the predicted EE was slightly higher than the measured EE. DISCUSSION: Triaxial accelerometry, when total, vertical, and horizontal accelerations are utilized, can effectively evaluate different types of activities and estimate EE for low-intensity physical activities associated with modern lifestyles.

Evaluation of low-intensity physical activity by triaxial accelerometry. Publishing Authors By Initials

T Midorikawa,S Tanaka,K Kaneko,K Koizumi,K Ishikawa-Takata,J Futami,I Tabata,T Midorikawa,S Tanaka,K Kaneko,K Koizumi,K Ishikawa-Takata,J Futami,I Tabata,T Midorikawa,S Tanaka,K Kaneko,K Koizumi,K Ishikawa-Takata,J Futami,I Tabata,

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Evaluation of low-intensity physical activity by triaxial accelerometry. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Obesity (Silver Spring, Md.)

VOLUME: 15

Page Numbers: 3031-8

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ISSN: 1930-7381

DAY: 16

MONTH: Dec

YEAR: 2007

Evaluation of low-intensity physical activity by triaxial accelerometry. Information

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LANGUAGE: eng

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AFFILIATION: Faculty of Sport Sciences, Waseda University, 2-579-15 Mikajima, Tokorozawa, Saitama 359-1192, Japan. taishi@aoni.waseda.jp.

Country: United States

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MEDLINETA: Obesity (Silver Spring)

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