Roemmich James N, Lobarinas Christina L, Barkley Jacob E, White Tressa M, Paluch Rocco, Epstein Leonard H
Dept. of Pediatrics, School of Medicine and Biomedical Sciences, SUNY Buffalo, Buffalo, NY, USA.
Pediatr Exerc Sci. 2012 Aug;24(3):384-98. doi: 10.1123/pes.24.3.384.
This study evaluated the effectiveness of an open-loop system that reinforces physical activity with TV watching to increase children's physical activity. Nonoverweight, sedentary boys and girls (8-12 y) were randomized to a group that received feedback of activity counts + reinforcement for physical activity by providing access to television (F+R, n = 20); or to feedback, no reinforcement (Feedback, n = 20) or no feedback, no reinforcement control (Control, n = 21) groups. Children wore an accelerometer with a count display for 4-months with a 1-year follow-up. F+R reduced TV by 68 min/day and TV time was lower than the Feedback (p < .005) and Control (p < .002) groups. TV time of F+R remained 31 min lower (p < .02) than baseline at 1-year. F+R had a 44% increase in physical activity, which was greater than the feedback (p < .04) and control (p < .01) groups. An open-loop system decreases TV viewing and increases physical activity of children for 4-months. TV of the F+R group remained lower at 12 months, suggesting a reduction in screen-time habits.
本研究评估了一种通过看电视强化身体活动来增加儿童身体活动量的开环系统的有效性。将不超重的久坐不动的男孩和女孩（8 - 12岁）随机分为三组：一组通过提供看电视的机会获得活动计数反馈并强化身体活动（F + R组，n = 20）；一组获得反馈但无强化（反馈组，n = 20）；以及无反馈、无强化的对照组（对照组，n = 21）。儿童佩戴带有计数显示的加速度计4个月，并进行1年的随访。F + R组每天看电视时间减少68分钟，且看电视时间低于反馈组（p <.005）和对照组（p <.002）。F + R组在1年时看电视时间仍比基线低31分钟（p <.02）。F + R组的身体活动量增加了44%，高于反馈组（p <.04）和对照组（p <.01）。一种开环系统可在4个月内减少儿童看电视时间并增加身体活动量。F + R组在12个月时看电视时间仍较低，表明屏幕时间习惯有所减少。
