1Neuromuscular Research Center, Department of Biology of Physical Activity, University of Jyväskylä, Jyväskylä, FINLAND; 2Department of Sport Sciences, University of Jyväskylä, Jyväskylä, FINLAND; and 3Gerontology Research Center, Department of Health Sciences, University of Jyväskylä, Jyväskylä, FINLAND.
Med Sci Sports Exerc. 2014 Nov;46(11):2122-31. doi: 10.1249/MSS.0000000000000335.
Interventions targeting sedentary time are needed. We used detailed EMG recordings to study the short-term effectiveness of simple sedentary time-targeted tailored counseling on the total physical activity spectrum.
This cluster randomized controlled trial was conducted between 2011 and 2013 (InPact, ISRCTN28668090), and short-term effectiveness of counseling is reported in the present study. A total of 133 office workers volunteered to participate, from which muscle activity data were analyzed from 48 (intervention, n = 24; control, n = 24). After a lecture, face-to-face tailored counseling was used to set contractually binding goals regarding breaking up sitting periods and increasing family based physical activity. Primary outcome measures were assessed 11.8 ± 1.1 h before and a maximum of 2 wk after counseling including quadriceps and hamstring muscle inactivity time, sum of the five longest muscle inactivity periods, and light muscle activity time during work, commute, and leisure time.
Compared with those in the controls, counseling decreased the intervention group's muscle inactivity time by 32.6 ± 71.8 min from 69.1% ± 8.5% to 64.6% ± 10.9% (whole day, P < 0.05; work, P < 0.05; leisure, P < 0.05) and the sum of the five longest inactivity periods from 35.6 ± 14.8 to 29.7 ± 10.1 min (whole day, P < 0.05; leisure, P < 0.01). Concomitantly, light muscle activity time increased by 20.6 ± 52.6 min, from 22.2% ± 7.9% to 25.0% ± 9.7% (whole day, P < 0.05; work, P < 0.01; leisure, P < 0.05), and during work time, average EMG amplitude (percentage of EMG during maximal voluntary isometric contraction (MVC) (%EMG MVC)) increased from 1.6% ± 0.9% to 1.8% ± 1.0% (P < 0.05) in the intervention group compared with that in the controls.
A simple tailored counseling was able to reduce muscle inactivity time by 33 min, which was reallocated to 21 min of light muscle activity. During work time, average EMG amplitude increased by 13%, reaching an average of 1.8% of EMG MVC. If maintained, this observed short-term effect may have health-benefiting consequences.
需要针对久坐时间的干预措施。我们使用详细的肌电图记录来研究简单的针对久坐时间的定制咨询对整体身体活动谱的短期效果。
这是一项在 2011 年至 2013 年期间进行的聚类随机对照试验（InPact，ISRCTN28668090），本研究报告了咨询的短期效果。共有 133 名上班族自愿参加，其中 48 人（干预组，n=24；对照组，n=24）分析了肌肉活动数据。在讲座之后，采用面对面的定制咨询来设定关于打破久坐时间和增加家庭基础身体活动的合同约束性目标。主要观察指标包括咨询前 11.8 ± 1.1 小时和最多 2 周后评估的股四头肌和腿筋肌肉不活动时间、最长的五个不活动期总和以及工作、通勤和休闲时间的轻肌肉活动时间。
与对照组相比，咨询将干预组的肌肉不活动时间从 69.1%±8.5%减少到 64.6%±10.9%（全天，P<0.05；工作时，P<0.05；休闲时，P<0.05），最长的五个不活动期总和从 35.6 ± 14.8 减少到 29.7 ± 10.1 分钟（全天，P<0.05；休闲时，P<0.01）。同时，轻肌肉活动时间增加了 20.6 ± 52.6 分钟，从 22.2%±7.9%增加到 25.0%±9.7%（全天，P<0.05；工作时，P<0.01；休闲时，P<0.05），并且在工作时间，干预组的平均肌电图幅度（最大自主等长收缩（MVC）期间肌电图的百分比（%EMG MVC））从 1.6%±0.9%增加到 1.8%±1.0%（P<0.05），而对照组则保持不变。
简单的定制咨询能够减少 33 分钟的肌肉不活动时间，将其重新分配到 21 分钟的轻肌肉活动时间。在工作时间，平均肌电图幅度增加了 13%，达到 EMG MVC 的平均 1.8%。如果维持下去，这种短期观察到的效果可能会产生有益健康的影响。
