East Carolina Diabetes and Obesity Institute, East Carolina University, Greenville, NC.
Med Sci Sports Exerc. 2021 Oct 1;53(10):2152-2163. doi: 10.1249/MSS.0000000000002675.
Epidemiological studies suggest that sedentary behavior is an independent risk factor for cardiovascular mortality independent of meeting physical activity guidelines. However, limited evidence of this relationship is available from prospective interventions. The purpose of the present study is to evaluate the combined effect of aerobic training and increasing nonexercise physical activity on body composition and cardiometabolic risk factors.
Obese adults (N = 45) were randomized to 6 months of aerobic training (AERO), aerobic training and increasing nonexercise physical activity (~3000 steps above baseline levels; AERO-PA), or a control (CON) group. The AERO and AERO-PA groups performed supervised aerobic training (3-4 times per week). The AERO-PA group wore Fitbit One accelerometers and received behavioral coaching to increase nonexercise physical activity.
There was a larger increase in fitness in the AERO-PA group (0.27 L·min-1; confidence interval (CI), 0.16 to 0.40 L·min-1) compared with the AERO group (0.09 L·min-1; CI, -0.04 to 0.22 L·min-1) and the CON group (0.01; CI, -0.11 to 0.12 L·min-1). Although significant findings were not observed in the entire study sample, when the analysis was restricted to participants compliant to the intervention (n = 33), we observed significant reductions in waist circumference, percent weight loss, body fat, 2-h glucose, and 2-h insulin in comparison to the CON group (P < 0.05), but not the AERO group. Furthermore, linear regression models showed that change in steps was associated with 21% and 26% of the variation in percent weight loss and percent fat loss, respectively.
Increasing nonexercise physical activity with aerobic training may represent a viable strategy to augment the fitness response in comparison to aerobic training alone and has promise for other health indicators.
流行病学研究表明，久坐行为是心血管死亡率的独立危险因素，与是否符合体力活动指南无关。然而，前瞻性干预研究对此相关性的证据有限。本研究旨在评估有氧运动训练和增加非运动体力活动对身体成分和心血管代谢危险因素的综合影响。
肥胖成年人（N=45）随机分为 6 个月的有氧运动训练（AERO）组、有氧运动训练和增加非运动体力活动（比基线水平增加~3000 步；AERO-PA）组或对照组（CON）。AERO 和 AERO-PA 组进行监督性有氧运动训练（每周 3-4 次）。AERO-PA 组佩戴 Fitbit One 加速度计并接受行为指导以增加非运动体力活动。
与 AERO 组（0.09 L·min-1；置信区间（CI），-0.04 至 0.22 L·min-1）和 CON 组（0.01；CI，-0.11 至 0.12 L·min-1）相比，AERO-PA 组的体能有更大的提高（0.27 L·min-1；CI，0.16 至 0.40 L·min-1）。尽管整个研究样本中未观察到显著结果，但当分析仅限于符合干预要求的参与者（n=33）时，与 CON 组相比，我们观察到腰围、体重减轻百分比、体脂肪、2 小时血糖和 2 小时胰岛素显著降低（P<0.05），但与 AERO 组无显著差异。此外，线性回归模型表明，步数的变化与体重减轻百分比和体脂肪减少百分比的变化分别相关 21%和 26%。
与单独进行有氧运动训练相比，有氧运动训练结合增加非运动体力活动可能是增强体能反应的可行策略，并且对其他健康指标也有希望。
