Kanda Masae, Minakata Yoshiaki, Matsunaga Kazuto, Sugiura Hisatoshi, Hirano Tsunahiko, Koarai Akira, Akamatsu Keiichiro, Ichikawa Tomohiro, Ichinose Masakazu
The Third Department of Internal Medicine, Wakayama Medical University, School of Medicine, Japan.
Intern Med. 2012;51(4):369-75. doi: 10.2169/internalmedicine.51.6441. Epub 2012 Feb 15.
The quantification of physical activity is useful for the management of chronic obstructive pulmonary disease (COPD) but has not been fully established yet. The DynaPort Activity Monitor(®) (DAM), a triaxial accelerometer is the only well validated accelerometer in Caucasians but it has not been validated in Japanese COPD patients. We initially evaluated the reproducibility of the DAM in Japanese healthy subjects. Next, the within-subject repeatability and the determinants of physical activity were investigated in Japanese COPD patients.
The durations of locomotion, standing, and sitting measured by the DAM were compared to those of the self-records (Study 1). COPD patients wore the DAM for 3 days and the durations of each activity of 2 selected days were compared to assess the repeatability (Study 2). The relationship between the duration of locomotion and the physiological properties were examined (Study 3).
The activities measured by the DAM were significantly associated with those of the self-records (p<0.001). The values of the intra-class correlation coefficient (ICC) for the reproducibility were over 0.99, and the agreement with the self-records was observed for the DAM. Similarly, the values of ICC for repeatability were over 0.84 in all activities, and there was no systematic bias in the COPD patients. The duration of locomotion was negatively correlated with the total lung capacity (TLC) and closing capacity/TLC, but not with other pulmonary functions, exercise capacity, muscle force, dyspnea, or modified BODE index.
The triaxial accelerometer is reliable for evaluating the physical activity of Japanese COPD patients.
身体活动的量化对慢性阻塞性肺疾病（COPD）的管理很有用，但尚未完全确立。DynaPort活动监测仪（DAM）是一种三轴加速度计，是唯一在高加索人中得到充分验证的加速度计，但尚未在日本COPD患者中得到验证。我们首先评估了DAM在日本健康受试者中的可重复性。接下来，对日本COPD患者的个体内重复性和身体活动的决定因素进行了研究。
将DAM测量的行走、站立和坐立时间与自我记录的时间进行比较（研究1）。COPD患者佩戴DAM 3天，比较2个选定日期中每项活动的持续时间以评估重复性（研究2）。研究了行走持续时间与生理特性之间的关系（研究3）。
DAM测量的活动与自我记录的活动显著相关（p<0.001）。可重复性的组内相关系数（ICC）值超过0.99，DAM与自我记录结果相符。同样，所有活动的重复性ICC值均超过0.84，COPD患者中无系统性偏差。行走持续时间与肺总量（TLC）和闭合容量/TLC呈负相关，但与其他肺功能、运动能力、肌肉力量、呼吸困难或改良BODE指数无关。
三轴加速度计在评估日本COPD患者的身体活动方面是可靠的。
