目的:久坐行为对肥胖和慢性疾病的不利影响是公认的。然而,久坐行为的患病率增加了,只有少数人符合建议的体育锻炼指南。这项研究旨在调查习惯性的腿部颤抖,传统上认为不利的行为,可以作为改善能量代谢的有效策略。
方法:进行了一项随机交叉研究,涉及15名参与者(平均[SD]年龄,25.4[3.6];平均[SD]体重指数,22[3];7名妇女[46.7%])。研究设计涉及坐姿和腿部抖动条件的随机序列,每个条件持续20分钟。能源支出,呼吸频率,氧饱和度,和其他相关变量在每个条件下进行测量。
结果:与坐着相比,腿部抖动显著增加总能量消耗[1.088kj/min,95%置信区间,0.69-1.487kj/min],主要是通过升高的碳水化合物氧化。腿部摇动期间的平均代谢当量表现出从1.5到1.8的显着增加。腿部抖动也提高了呼吸频率,分钟通风,血氧饱和度,而对心率或血压无明显影响。肌电图数据证实了小腿肌肉的主要激活,并且没有增加肌肉疲劳。有趣的是,观察到增加的能量消耗与腿部颤抖的频率和腿部肌肉质量之间存在显着相关性。
结论:我们的研究提供了证据,习惯性的腿部抖动可以使整体能量消耗增加约16.3%。这种简单可行的方法提供了一种方便的方法来提高身体活动水平。
OBJECTIVE: The adverse effects of sedentary behavior on obesity and chronic diseases are well established. However, the prevalence of sedentary behavior has increased, with only a minority of individuals meeting the recommended physical activity guidelines. This study aimed to investigate whether habitual leg shaking, a behavior traditionally considered unfavorable, could serve as an effective strategy to improve energy metabolism.
METHODS: A randomized crossover study was conducted, involving 15 participants (mean [SD] age, 25.4 [3.6]; mean [SD] body mass index, 22 [3]; 7 women [46.7%]). The study design involved a randomized sequence of sitting and leg shaking conditions, with each condition lasting for 20 min. Energy expenditure, respiratory rate, oxygen saturation, and other relevant variables were measured during each condition.
RESULTS: Compared to sitting, leg shaking significantly increased total energy expenditure [1.088 kj/min, 95% confidence interval, 0.69-1.487 kj/min], primarily through elevated carbohydrate oxidation. The average metabolic equivalent during leg shaking exhibited a significant increase from 1.5 to 1.8. Leg shaking also raised respiratory rate, minute ventilation, and blood oxygen saturation levels, while having no obvious impact on heart rate or blood pressure. Electromyography data confirmed predominant activation of lower leg muscles and without increased muscle fatigue. Intriguingly, a significant correlation was observed between the increased energy expenditure and both the frequency of leg shaking and the muscle mass of the legs.
CONCLUSIONS: Our study provides evidence that habitual leg shaking can boost overall energy expenditure by approximately 16.3%. This simple and feasible approach offers a convenient way to enhance physical activity levels.