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Physical activity cut‐offs and risk factors for preventing child obesity in J apan
Author(s) -
Minematsu Kazuo,
Kawabuchi Ryosuke,
Okazaki Hiromi,
Tomita Hiroyuki,
Tobina Takuro,
Tanigawa Takeshi,
Tsunawake Noriaki
Publication year - 2015
Publication title -
pediatrics international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.49
H-Index - 63
eISSN - 1442-200X
pISSN - 1328-8067
DOI - 10.1111/ped.12446
Subject(s) - medicine , obesity , bioelectrical impedance analysis , physical activity , body mass index , childhood obesity , physical fitness , logistic regression , metabolic equivalent , physical therapy , demography , overweight , sociology
Background There is no official recommendations for physical activity level or steps for preventing and improving child obesity in J apan. Methods Three hundred and two J apanese children aged 9–12 years were recruited wore 3‐D speed sensors. Subjects were divided into two groups using the criteria for child obesity in J apan. Body composition was measured on bioelectrical impedance analysis. Physical fitness test was done to evaluate physical strength. Twenty‐four hour total steps, energy expenditure, and metabolic equivalents ( MET ) from M onday to S unday were consecutively measured. The cut‐offs for steps and physical activity level for preventing child obesity were evaluated on receiver operating characteristic curves. Daily life‐related risk factors for child obesity were assessed on logistic regression analysis. Results In both sexes, body volume; bodyweight, body mass index, fat mass, and percentage body fat in the obese group was significantly higher than in the normal group, but age and height were not different ( P < 0.001). Aerobic power, running speed, and explosive strength in the obese group were inferior to those in the normal group ( P < 0.001). More than 40 min of 4 MET exercise, defined as moderate–vigorous exercise, and 11 000 steps per day are essential to prevent child obesity. Additionally, >2 h TV viewing per day is a significant risk factor for child obesity (OR, 3.43; 95% CI : 1.27–9.31). Conclusion Cut‐offs for physical activity and potential risk factors for child obesity have been identified. Recommendations for changes to daily lifestyle for school‐aged J apanese children are given.