Faculty of Biomedical and Life Sciences, University of Glasgow, Glasgow, UK.
J Phys Act Health. 2012 Jan;9(1):115-23. doi: 10.1123/jpah.9.1.115.
Urbanization affects lifestyles in the developing world but no studies have assessed the impact on objectively measured physical activity in children and adolescents from sub-Saharan Africa.
To compare objectively measured habitual physical activity, sedentary time, and indices of adiposity in adolescents from rural and urban areas of Kenya.
Physical activity and sedentary time were assessed by accelerometry for 5 consecutive days in 97 (50 female and 47 male) rural and 103 (52 female and 51 male) urban adolescents (mean age 13 ± 1 years). Body Mass Index (BMI) and BMI z-scores were used to assess adiposity.
Rural males spent more time in moderate-to-vigorous intensity physical activity (MVPA) compared with urban males (68 ± 22 vs. 50 ± 17 min, respectively; P < .001). Similarly, Rural females spent more time in MVPA compared with urban females (62 ± 20 vs. 37 ± 20 min, respectively; P < .001). Furthermore, there were significant differences in daily sedentary time between rural and urban subjects. Residence (rural vs. urban) significantly (P < .001) influenced BMI z-score (R(2) = .46).
Rural Kenyan adolescents are significantly more physically active (and less sedentary) and have lower indices of adiposity compared with urban adolescents and this is a likely reflection of the impact of urbanization on lifestyle in Kenya.
城市化影响发展中国家的生活方式，但尚无研究评估其对撒哈拉以南非洲儿童和青少年身体活动的客观测量的影响。
比较肯尼亚农村和城市地区青少年的客观测量的习惯性身体活动、久坐时间和肥胖指数。
对 97 名农村（50 名女性和 47 名男性）和 103 名城市（52 名女性和 51 名男性）青少年（平均年龄 13 ± 1 岁）进行了连续 5 天的加速度计评估，以评估身体活动和久坐时间。身体质量指数（BMI）和 BMI z 分数用于评估肥胖。
与城市男性相比，农村男性的中高强度体力活动（MVPA）时间更多（68 ± 22 比 50 ± 17 分钟，分别为；P <.001）。同样，农村女性比城市女性的 MVPA 时间更多（62 ± 20 比 37 ± 20 分钟，分别为；P <.001）。此外，农村和城市青少年的日常久坐时间存在显著差异。居住地（农村与城市）显著（P <.001）影响 BMI z 分数（R² =.46）。
与城市青少年相比，肯尼亚农村青少年的身体活动明显更多（且久坐时间更少），肥胖指数更低，这可能反映了城市化对肯尼亚生活方式的影响。
