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首页> 外文期刊>Physiological measurement >Muscle activation and energy expenditure of sedentary behavior alternatives in young and old adults
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Muscle activation and energy expenditure of sedentary behavior alternatives in young and old adults

机译：年轻人和老年人的久坐行为替代品的肌肉激活和能量消耗

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The physiological mechanisms that underlie the metabolic benefits of breaking up sedentary behavior (SB) have yet to be determined. The purpose of this study is to compare energy expenditure (EE) and muscle activation (MA) responses to sitting and four SB alternatives in younger and older adults. Twenty-two adults, grouped by age (21-35 and 62-76 years), completed five randomly ordered 20 min tasks: (1) continuous sitting (Sit), (2) sitting on a stability ball (Ball), (3) continuous standing (Stand), (4) sitting interrupted by walking (S/W), and (5) sitting interrupted by standing (S/S). Muscle activation of two upper (trapezius and erector spinae) and two lower (rectus femoris and medial gastrocnemius) body muscles and total body EE were measured continuously. A linear mixed model using gender and age as a covariate with Bonferroni adjustment were used to determine significant differences between tasks. Collectively, S/W produced significantly higher MA and EE compared with Sit (p < 0.001). Stand and Ball provided significantly greater EE, but not MA, compared to Sit (p < 0.05), while S/S did not significantly change EE or MA compared to Sit. There were no net EE differences when comparing age groups across the tasks. Upper body MA was not consistent in both age groups across tasks. Specifically, during S/W the upper body MA of older adults (9.7 +/- 1.5% MVC) was double that of young adults (4.8 +/- 0.7% MVC, p = 0.006). Lower body MA responded similarly to all tasks in both age groups. Disrupting sitting with walking produced the largest increase in EE and MA compared to other SB alternatives in both age groups. These results are important considering the wide use of SB alternatives by researchers and public health practitioners.
机译：打破久坐行为（SB）的新陈代谢益处的生理机制尚未确定。这项研究的目的是比较年轻人和老年人对坐着和四种SB选择的能量消耗（EE）和肌肉激活（MA）反应。 22个按年龄分组（21-35岁和62-76岁）的成年人完成了5个随机下令的20分钟任务：（1）连续坐着（坐下），（2）坐在稳定球上（球），（3 ）连续站立（Stand），（4）行走中断（S / W）和（5）站立中断（S / S）。连续测量两个上部（斜方肌和竖脊肌）和两个下部（股直肌和腓肠肌内侧）的肌肉激活和全身EE。使用性别和年龄作为协变量与Bonferroni调整的线性混合模型来确定任务之间的显着差异。与Sit相比，S / W总体上产生了更高的MA和EE（p <0.001）。与Sit相比，Stand和Ball提供的EE明显更高，但MA则没有（p <0.05），而S / S的S / S与Sit相比并没有显着改变EE或MA。在比较任务中的年龄组时，没有净EE差异。在两个年龄段的任务中，上身MA均不一致。具体而言，在S / W期间，老年人的上半身MA（9.7 +/- 1.5％MVC）是年轻人的上半身MA（4.8 +/- 0.7％MVC，p = 0.006）。在两个年龄段中，下半身MA对所有任务的反应都相似。与两个年龄段的其他SB替代方案相比，扰乱步行行走导致EE和MA增幅最大。考虑到研究人员和公共卫生从业人员广泛使用SB替代品，这些结果非常重要。

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