Division of Acute, Critical and Long Term Care Programs, University of Michigan, Ann Arbor, MI 48109, USA.
Front Med. 2013 Mar;7(1):126-31. doi: 10.1007/s11684-012-0236-0. Epub 2012 Dec 22.
Recent evidence demonstrates the independent negative effects of sedentary behavior on health, but there are few objective measures of sedentary behavior. Most instruments measure physical activity and are not validated as measures of sedentary behavior. The purpose of this study was to evaluate the validity of the IDEEA system's measures of sedentary and low-intensity physical activities: lying, reclining, sitting and standing. Thirty subjects, 14 men and 16 women, aged 23 to 77 years, body mass index (BMI) between 18 to 34 kg/m(2), participated in the study. IDEEA measures were compared to direct observation for 27 activities: 10 lying in bed, 3 lying on a sofa, 1 reclining in a lawn chair, 10 sitting and 3 standing. Two measures are reported, the percentage of activities accurately identified and the percentage of monitored time that was accurately labeled by the IDEEA system for all subjects. A total of 91.6% of all observed activities were accurately identified and 92.4% of the total monitored time was accurately labeled. The IDEEA system did not accurately differentiate between lying and reclining so the two activities were combined for calculating accuracy. Using this approach the IDEEA system accurately identified 96% of sitting activities for a total of 97% of the monitored sitting time, 99% and 99% for standing, 87% and 88% for lying in bed, 87% and 88% for lying on the sofa, and 83% and 83% for reclining on a lawn chair. We conclude that the IDEEA system accurately recognizes sitting and standing positions, but it is less accurate in identifying lying and reclining positions. We recommend combining the lying and reclining activities to improve accuracy. The IDEEA system enables researchers to monitor lying, reclining, sitting and standing with a reasonable level of accuracy and has the potential to advance the science of sedentary behaviors and low-intensity physical activities.
最近的证据表明，久坐行为对健康有独立的负面影响，但很少有客观的久坐行为测量方法。大多数仪器都测量身体活动，而没有验证它们作为久坐行为的测量方法。本研究的目的是评估 IDEEA 系统测量久坐和低强度体力活动的方法的有效性：躺着、斜躺、坐着和站着。30 名受试者，14 名男性和 16 名女性，年龄 23 至 77 岁，体重指数（BMI）在 18 至 34kg/m(2)之间，参与了研究。IDEEA 测量结果与 27 项活动的直接观察结果进行了比较：10 项卧床活动、3 项斜躺沙发活动、1 项躺草坪椅活动、10 项坐活动和 3 项站活动。报告了两种测量方法，所有受试者准确识别活动的百分比和 IDEEA 系统准确标记监测时间的百分比。所有观察到的活动中有 91.6%被准确识别，总监测时间中有 92.4%被准确标记。IDEEA 系统不能准确区分躺着和斜躺，因此将这两种活动结合起来计算准确性。使用这种方法，IDEEA 系统准确地识别了 96%的坐姿活动，总共占监测坐姿时间的 97%，99%和 99%的站立活动，87%和 88%的卧床活动，87%和 88%的斜躺沙发活动，以及 83%和 83%的斜躺草坪椅活动。我们得出结论，IDEEA 系统准确识别坐姿和站姿，但识别躺姿和斜躺姿的准确性较低。我们建议将躺着和斜躺活动结合起来以提高准确性。IDEEA 系统使研究人员能够以合理的准确性监测躺着、斜躺、坐着和站着，并有潜力推进久坐行为和低强度体力活动的科学研究。
