title: The relationship of body composition to daily physical activity in free-living Japanese adult men.
abstract: The objective of the present study was to investigate whether a previously reported apparent negative relationship between fat mass and daily physical activity in Japanese adult women would also be observed in Japanese adult men. The subjects were grouped into quartiles of BMI and body fat percentage (%BF). The number of steps walked each day and the duration of light- to vigorous-intensity physical activity were assessed by an accelerometer over the same period of time as for the doubly labelled water experiment. The results showed that BMI negatively correlated with the number of steps and time spent in moderate-intensity physical activity, whereas %BF showed a negative relationship with physical activity-related energy expenditure (PAEE)/body weight (BW) and physical activity level. The analysis of data using %BF quartiles revealed that PAEE/BW decreased from the second quartile in which the BMI was < 25 kg/m2. These observations are similar to those reported in our previous study in Japanese adult women. These cross-sectional studies cannot prove causality, and that obesity causes physical inactivity may be the case. However, the results of the present study provide information regarding which physical activity variables should be used in longitudinal studies.
authors.affiliation: Department of Physical Education, Konkuk University, Seoul, Korea.
authors.forename: Jonghoon
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Nutritional Education, National Institute of Health and Nutrition, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8636, Japan.
authors.forename: Kazuko
authors.initials: K
authors.lastname: Ishikawa-Takata
authors.affiliation: Department of Nutritional Science, National Institute of Health and Nutrition, Tokyo, Japan.
authors.forename: Shigeho
authors.initials: S
authors.lastname: Tanaka
authors.affiliation: Faculty of Engineering, Chiba Institute of Technology, Narashino, Japan.
authors.forename: Yuki
authors.initials: Y
authors.lastname: Hikihara
authors.affiliation: Faculty of Informatics and Engineering, The University of Electro-Communications, Tokyo, Japan.
authors.forename: Kazunori
authors.initials: K
authors.lastname: Ohkawara
authors.affiliation: National Institute of Health and Nutrition, Tokyo, Japan.
authors.forename: Shaw
authors.initials: S
authors.lastname: Watanabe
authors.affiliation: Department of Health Promotion and Exercise, National Institute of Health and Nutrition, Tokyo, Japan.
authors.forename: Motohiko
authors.initials: M
authors.lastname: Miyachi
authors.affiliation: Department of Nutrition, Koshien University, Hyogo, Japan.
authors.forename: Akemi
authors.initials: A
authors.lastname: Morita
authors.affiliation: Department of Nutritional Education, Kanagawa Institute of Technology, Kanagawa, Japan.
authors.forename: Naomi
authors.initials: N
authors.lastname: Aiba
authors.affiliation: Faculty of Sport and Health Science, Ritsumeikan University, Shiga, Japan.
authors.forename: Izumi
authors.initials: I
authors.lastname: Tabata
mesh_terms: D000273:Adipose Tissue; D000328:Adult; D044466:Asian People; D001823:Body Composition; D015992:Body Mass Index; D001835:Body Weight; D003430:Cross-Sectional Studies; D004734:Energy Metabolism; D015444:Exercise; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000209:etiology; D005082:Physical Exertion; D016138:Walking