Huang Rong, Ho Sai-Yin, Lo Wing-Sze, Lam Tai-Hing
School of Public Health, The University of Hong Kong, Hong Kong, China.
PLoS One. 2014 Feb 28;9(2):e90193. doi: 10.1371/journal.pone.0090193. eCollection 2014.
To examine the association of constipation with exercise, non-exercise physical activity, and sedentary behaviours in Hong Kong adolescents.
In 2006-2007, 42 secondary schools were randomly selected to participate in the Hong Kong Student Obesity Surveillance (HKSOS) project. A total of 33692 Form 1-7 students (44.9% boys; mean age 14.8, SD 1.9 years) completed an anonymous questionnaire on lifestyle behaviours. Constipation was defined as a frequency of evacuation of less than once every two days. Exercise (moderate-to-vigorous levels) and non-exercise physical activity (NEPA) were each considered insufficient when less than 1 hour per day, and sedentary behaviours were considered excessive when over 4 hours per day. Logistic regression was used to calculate adjusted odds ratio (AOR) for constipation in relation to exercise, NEPA, and sedentary behaviours, adjusting for potential confounders.
Constipation was identified in 15.6% (95% CI 15.2% - 16.0%) of adolescents overall, 14.0% in those with sufficient exercise and 19.6% in those without. Constipation was associated with insufficient exercise (AOR 1.26, 95% CI 1.16 - 1.36), insufficient NEPA 1.21 (1.10 - 1.33) and excessive sedentary behaviours (1.25, 1.17 - 1.34). Compared with having none of the above 3 inactive behaviours, increasing AORs of constipation were observed for having 1 (AOR 1.23), 2 (AOR 1.57) and 3 (AOR 1.88) inactive behaviours (p for trend <0.001).
Constipation was associated with insufficient physical activity and excessive sedentary behaviours among Chinese adolescents with a dose-response relation. If the association is causal, constipation could be prevented by promotion of physical activity.
研究香港青少年便秘与运动、非运动性身体活动及久坐行为之间的关联。
在2006 - 2007年，随机选取42所中学参与香港学生肥胖监测（HKSOS）项目。共有33692名中一至中七学生（44.9%为男生；平均年龄14.8岁，标准差1.9岁）完成了一份关于生活方式行为的匿名问卷。便秘定义为排便频率少于每两天一次。运动（中等至剧烈强度）和非运动性身体活动（NEPA）若每天少于1小时则各自被视为不足，久坐行为若每天超过4小时则被视为过度。采用逻辑回归计算便秘与运动、NEPA及久坐行为相关的调整优势比（AOR），并对潜在混杂因素进行调整。
总体上15.6%（95%可信区间15.2% - 16.0%）的青少年被认定有便秘，运动充足者中为14.0%，运动不足者中为19.6%。便秘与运动不足（AOR 1.26，95%可信区间1.16 - 1.36）、NEPA不足（1.21，1.10 - 1.33）及久坐行为过度（1.25，1.17 - 1.34）相关。与无上述三种不活跃行为的情况相比，有1种（AOR 1.23）、2种（AOR 1.57）和3种（AOR 1.88）不活跃行为时，便秘的AOR呈上升趋势（趋势p<0.001）。
中国青少年便秘与身体活动不足及久坐行为过度相关，且存在剂量反应关系。如果这种关联是因果关系，那么通过促进身体活动可预防便秘。
