Does the wearing time of motion sensor interfere with the choice of physical activity in daily life outcomes of COPD patients?

ABSTRACT This study analyzes physical activity in the daily lives (PADL) of patients with chronic obstructive pulmonary disease (COPD), measured in three different periods of daily use of motor sensor: 8 hours, 12 hours, and awake time, in order to identify if the PADL outcomes are different among each other. It is a transversal study with 45 patients (66±8 years) classified as having moderate to severe COPD. The PADL was assessed using the physical activity monitor SenseWear Armband (SAB) for 7 consecutive days, 24 hours a day. The PADL results provided by the monitor in the three evaluation periods within 24 hours of use were compared. The sedentary and physical activity outcomes (number of steps and total energy expenditure) were different in the three periods using the SAB, having higher values in the assessment per awake time. Regarding the physical activity outcomes divided into age groups - 3 or 2 metabolic equivalents (METs) -, the outcomes were similar to the evaluation for 12 hours and per awake time. It was concluded, thus, that the use of physical activity monitor during the awake time is the most indicated outcome for accurate and complete monitoring of sedentarism and physical activity in COPD patients.摘要：本研究针对慢性阻塞性肺疾病（Chronic Obstructive Pulmonary Disease, COPD）患者的日常生活体力活动（Physical Activity in Daily Lives, PADL）展开分析，研究中采用运动传感器分别在每日使用的三个不同时长周期——8小时、12小时以及觉醒时长——采集数据，旨在探究不同周期下PADL的评估结果是否存在差异。本研究为横断面研究，共纳入45例年龄为66±8岁的中重度COPD患者。所有受试者连续7天每日24小时佩戴SenseWear臂环（SenseWear Armband, SAB）体力活动监测仪以评估PADL。随后对该监测仪在24小时使用周期内的三个评估时段所产出的PADL结果进行对比分析。结果显示，采用SAB评估的三个时段中，久坐行为与体力活动指标（步数、总能量消耗）均存在显著差异，其中以觉醒时长评估所得的指标数值更高。针对按年龄分组并以3或2个代谢当量（METs）划分强度的体力活动指标，12小时评估与觉醒时长评估的结果较为相似。综上，采用觉醒时长段使用体力活动监测仪进行评估，是精准且全面监测COPD患者久坐行为与体力活动的最优方案。