Diabetes Care：餐后短时间散步降血糖效果更佳

　　美国一项研究表明，每餐后短时间散步可有效控制老年人餐后高血糖。论文6月11日在线发表于《糖尿病护理》（Diabetes Care）杂志。

　　研究纳入10名不吸烟、不经常活动、体质指数<35、105 mg/dl≤空腹血糖≤125 mg/dl的老年人（≥60岁）。受试者间隔4周完成3个随机排列的运动方案。每一方案均在热量室进行48小时，第1天为对照。第2天，受试者每餐后步行15分钟或在上午或下午持续步行45分钟。连续监测血糖48小时以上。结果为，与第1天相比，持续晨练[（118±14） mg/dl对（127±23） mg/dl]和餐后散步[（116±13） mg/dl对（129±24） mg/dl）]显著改善24小时血糖。与上午或下午持续步行45分钟相比，每餐后散步可更有效地降低两天间的晚餐后3小时血糖。

Three 15-min Bouts of Moderate Postmeal Walking Significantly Improves 24-h Glycemic Control in Older People at Risk for Impaired Glucose Tolerance.
OBJECTIVE
The purpose of this study was to compare the effectiveness of three 15-min bouts of postmeal walking with 45 min of sustained walking on 24-h glycemic control in older persons at risk for glucose intolerance.
RESEARCH DESIGN AND METHODS
Inactive older (≥60 years of age) participants (N = 10) were recruited from the community and were nonsmoking, with a BMI <35 kg m-2 and a fasting blood glucose concentration between 105 and 125 mg dL-1. Participants completed three randomly ordered exercise protocols spaced 4 weeks apart. Each protocol comprised a 48-h stay in a whole-room calorimeter, with the first day serving as the control day. On the second day, participants engaged in either 1) postmeal walking for 15 min or 45 min of sustained walking performed at 2) 10:30 a.m. or 3) 4:30 p.m.. All walking was on a treadmill at an absolute intensity of 3 METs. Interstitial glucose concentrations were determined over 48 h with a continuous glucose monitor. Substrate utilization was measured continuously by respiratory exchange (VCO2/VO2).
RESULTS
Both sustained morning walking (127 ± 23 vs. 118 ± 14 mg dL-1) and postmeal walking (129 ± 24 vs. 116 ± 13 mg dL-1) significantly improved 24-h glycemic control relative to the control day (P < 0.05). Moreover, postmeal walking was significantly (P < 0.01) more effective than 45 min of sustained morning or afternoon walking in lowering 3-h postdinner glucose between the control and experimental day.
CONCLUSIONS
Short, intermittent bouts of postmeal walking appear to be an effective way to control postprandial hyperglycemia in older people.