Immunonutrition Research Group, Department of Metabolism and Nutrition, Institute of Food Science and Technology and Nutrition (ICTAN), Spanish National Research Council (CSIC), Madrid, Spain.
Obes Facts. 2011;4(2):105-11. doi: 10.1159/000327686. Epub 2011 Apr 7.
To examine the combined influence of four lifestyle risk factors related to physical activity, television viewing, sleep duration, and meal frequency on body fat (BF) in adolescents.
This cross-sectional study comprised 1,310 Spanish adolescents (age 13-18.5 years). Lifestyle variables were self-reported and BF indicators (weight, height, six skinfold thicknesses, waist circumference) measured during the years 2000-2002. Lifestyle risk factors were: physically inactive, ≥ 3 h/day watching television, <8 h/day sleep duration, and <5 meals a day. The number of lifestyle risk factors was calculated for each participant, ranging from 0 to 4.
The number of lifestyle risk factors was positively associated with sum of six skinfolds, %BF, waist circumference, and waist-height ratio (all p < 0.001). The odds ratios (95% confidence interval) of overweight (including obesity) for groups with 1, 2, and 3-4 lifestyle risk factors compared with those with 0 were 2.86 (1.77-4.62), 3.61 (2.16-6.04), and 5.81 (3.07-10.99), respectively (p for trend <0.001). All the observations were independent of age, gender, race, socioeconomic status, and fat free mass.
The combined influence of four lifestyle risk factors is positively associated with BF and an approximately sixfold risk of overweight in adolescents.
探讨与身体活动、看电视时间、睡眠时间和进餐频率四项生活方式相关的风险因素对青少年体脂（BF）的综合影响。
本横断面研究纳入了 1310 名西班牙青少年（年龄 13-18.5 岁）。生活方式变量由参与者自我报告，BF 指标（体重、身高、6 处皮褶厚度、腰围）则于 2000-2002 年测量。生活方式风险因素包括：不活动、每天看电视≥3 小时、每天睡眠时间＜8 小时和每天进餐次数＜5 次。为每位参与者计算生活方式风险因素的数量，范围为 0 至 4。
生活方式风险因素的数量与 6 处皮褶厚度总和、%BF、腰围和腰高比呈正相关（均 p＜0.001）。与无生活方式风险因素的参与者相比，具有 1、2 和 3-4 个生活方式风险因素的参与者超重（包括肥胖）的比值比（95%置信区间）分别为 2.86（1.77-4.62）、3.61（2.16-6.04）和 5.81（3.07-10.99）（p 趋势＜0.001）。所有观察结果均独立于年龄、性别、种族、社会经济地位和去脂体重。
四项生活方式风险因素的综合影响与 BF 呈正相关，青少年超重的风险约增加六倍。
