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Acute Effects of Interrupting Prolonged Sitting on Vascular Function in Type 2 Diabetes
American Journal of Physiology-Heart and Circulatory Physiology ( IF 4.8 ) Pub Date : 2020-11-08 , DOI: 10.1152/ajpheart.00422.2020
Frances C. Taylor 1, 2 , David W. Dunstan 1, 2, 3 , Ashleigh R. Homer 1, 2 , Paddy C. Dempsey 1, 4, 5 , Bronwyn A. Kingwell 1, 6 , Rachel E. Climie 1 , Neville Owen 1, 7 , Neale D. Cohen 1 , Robyn N. Larsen 8 , Megan Grace 9 , Nina Eikelis 10 , Michael J. Wheeler 1, 3 , Melanie K. Townsend 1 , Nirav Maniar 11 , Daniel J. Green 3
Affiliation  

In healthy and overweight/obese adults, interrupting prolonged sitting with activity bouts mitigates impairment in vascular function. However, it is unknown whether these benefits extend to those with type 2 diabetes (T2D); nor, whether an optimal frequency of activity interruptions exist. We examined the acute effects on vascular function in T2D of interrupting prolonged sitting with simple resistance activities (SRA) at different frequencies. In a randomized crossover trial, 24 adults with T2D (35-70 years) completed three 7-hour conditions: 1) uninterrupted sitting (SIT); 2) sitting with 3 minute bouts of SRA every 30 min (SRA3); and, 3) sitting with 6 minute bouts of SRA every 60 min (SRA6). Femoral artery flow-mediated dilation (FMD), resting shear rate, blood flow and endothelin-1 were measured at 0h, 1h, 3.5h, 4.5h, and 6.5-7h. Mean femoral artery FMD over 7 hours was significantly higher in SRA3 (4.1 ± 0.3%) compared to SIT (3.7 ± 0.3%, p = 0.04), but not in SRA6. Mean resting femoral shear rate over 7 hours was increased significantly for SRA3 (45.3±4.1/s, p<0.001) and SRA6 (46.2±4.1/s, p<0.001) relative to SIT (33.1±4.1/s). Endothelin-1 concentrations were not statistically different between conditions. Interrupting sitting with activity breaks every 30 minutes, but not 60 minutes, significantly increased mean femoral artery FMD over 7 hours, relative to SIT. Our findings suggest that more-frequent and shorter breaks may be more beneficial than longer, less-frequent breaks for vascular health in those with T2D.

中文翻译:

中断长时间坐着对2型糖尿病患者血管功能的急性影响

在健康和超重/肥胖的成年人中,长时间的活动中断可减轻血管功能的损害。然而,这些益处是否扩展到2型糖尿病(T2D)尚不清楚。也没有最佳的活动中断频率。我们研究了不同时间的简单抵抗活动(SRA)中断长时间坐着对T2D血管功能的急性影响。在一项随机交叉试验中,有24位T2D成人(35-70岁)完成了3个7小时条件:1)不间断坐姿(SIT);2)每30分钟坐3分钟一圈SRA(SRA3);3)每60分钟坐6分钟一圈SRA(SRA6)。在0h,1h,3.5h,4.5h和6.5-7h分别测量股动脉血流介导的扩张(FMD),静息剪切率,血流和内皮素-1。与SIT(3.7±0.3%,p = 0.04)相比,SRA3(4.1±0.3%)在7小时内的平均股动脉FMD显着更高,但在SRA6中则没有。与SIT(33.1±4.1 / s)相比,SRA3(45.3±4.1 / s,p <0.001)和SRA6(46.2±4.1 / s,p <0.001)在7小时内的平均静止股骨剪切速率显着提高。不同条件下内皮素-1的浓度在统计学上没有差异。相对于SIT,活动中断会每30分钟(但不是60分钟)中断一次,从而在7小时内显着增加平均股动脉FMD。我们的研究结果表明,对于患有T2D的患者来说,更频繁和更短的休息时间可能比更长,更少频率的休息时间对血管健康有益。与SIT(33.1±4.1 / s)相比,SRA3(45.3±4.1 / s,p <0.001)和SRA6(46.2±4.1 / s,p <0.001)在7小时内的平均静止股骨剪切速率显着提高。不同条件下内皮素-1的浓度在统计学上没有差异。相对于SIT,活动中断会每30分钟(但不是60分钟)中断一次,从而在7小时内显着增加平均股动脉FMD。我们的研究结果表明,对于患有T2D的患者来说,更频繁和更短的休息时间可能比更长,更少频率的休息时间对血管健康有益。与SIT(33.1±4.1 / s)相比,SRA3(45.3±4.1 / s,p <0.001)和SRA6(46.2±4.1 / s,p <0.001)在7小时内的平均静止股骨剪切速率显着提高。不同条件下内皮素-1的浓度在统计学上没有差异。相对于SIT,活动中断会每30分钟(但不是60分钟)中断一次,从而在7小时内显着增加平均股动脉FMD。我们的研究结果表明,对于患有T2D的患者来说,更频繁和更短的休息时间可能比更长,更少频率的休息时间对血管健康有益。而不是60分钟,相对于SIT,在7小时内平均股动脉FMD显着增加。我们的研究结果表明,对于患有T2D的患者来说,更频繁和更短的休息时间可能比更长,更少频率的休息时间对血管健康有益。而不是60分钟,相对于SIT,在7小时内平均股动脉FMD显着增加。我们的研究结果表明,对于患有T2D的患者来说,更频繁和更短的休息时间可能比更长,更少频率的休息时间对血管健康有益。
更新日期:2020-11-09
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