HIỆU QUẢ CỦA CAN THIỆP BỔ SUNG CANXI, VITAMIN D VÀ KẼM LÊN CẢI THIỆN TĂNG TRƯỞNG VÀ THÀNH PHẦN CƠ THỂ TRONG CÁC GIAI ĐOẠN DẬY THÌ Ở HỌC SINH TRƯỜNG TRUNG HỌC CƠ SỞ THỊ TRẤN CỦ CHI THÀNH PHỐ HỒ CHÍ MINH

Abstract

Objectives: Studying the effect of supplementation with calcium, vitamin D and zinc
on the development of height, weight, and the changes of body composition in pubertal
adolescents. Methods: A community interventional study was conducted on 326 students
who were enrolling in a secondary school of the town of Cu Chi during the school year
2012-2013. Intervention group consisted of 145 students, who were supplemented with
300mg calcium, 400IU vitamin D and 5 mg zinc per day for one year, the remainder 181
students were in the control group. Results: Supplementation of Calcium, vitamin D, zinc
resulted in 3cm per year (p<0.001; t-test) height gain in puberty stage 1 of intervention
boys in comparison with boys in the control group. The weight gain in girls in intervention
group was higher than that in girls in control group in the stages 3 (p<0.05; t-test); 4
(p<0.05; t-test) and 5 (p<0.05; t-test) of puberty, which were 1.8kg, 3.1kg, and 1.7kg, respectively. In intervention group, body fat percentage of boys decreased by 2.1% per year
in comparison with boys in control group (p<0.01; t-test), while fat-free mass of girls in
intervention group increased by 1.1 kg per year more than girls in control group (p<0.001,
t-test). Conclusion: Intervention of supplementation with calcium, vitamin D, zinc resulted
in height increase and body fat decrease in boys; and weight increase in girls with the majority of gain in the fat-free mass.