Rozenberg Dmitry, Dolmage Thomas E, Evans Rachael A, Goldstein Roger S
Department of Respiratory Medicine (Drs Rozenberg and Goldstein and Mr Dolmage) and Respiratory Diagnostic and Evaluation Services (Mr Dolmage and Dr Goldstein), West Park Healthcare Centre, Toronto, Ontario, Canada; Department of Medicine, University of Toronto, Toronto, Ontario, Canada (Drs Rozenberg, Evans, and Goldstein); and Department of Infection, Immunity and Inflammation, School of Medicine and Biological Sciences, University of Leicester, Leicester, UK (Dr Evans).
J Cardiopulm Rehabil Prev. 2014 Sep-Oct;34(5):348-54. doi: 10.1097/HCR.0000000000000072.
Evaluation of the role of walking speeds in chronic obstructive pulmonary disease (COPD) should be preceded by an assessment of its repeatability. This study aimed to establish the repeatability of the usual (susual) and fast (sfast) walking speeds among patients with stable COPD and determine the accuracy of manual measurement.
Participants demonstrated their susual and sfast over 10 m with speed calculated using a stopwatch; the accuracy was confirmed with optical sensors. The walks were repeated after a 5-minute rest; the session was repeated on 2 subsequent days. The coefficient of repeatability (CR) was calculated for both speeds, and their stability over days was determined.
A total of 29 participants (forced expiratory volume in 1 second (FEV1) = 43 ± 25% predicted; FEV1/forced vital capacity (FVC) = 41 ± 13%; susual = 60.3 ± 11 m·min; sfast = 74.3 ± 11.5 m·min) completed the study. The CRs for the susual and sfast were 7.5 (95% CI: 5.0-10.0) and 7.1 (95% CI: 4.8-9.4) m·min, respectively. There was a small increase in the susual (5%; P < .001) on the second trial of every day and between successive days (5%; P < .001); the sfast was not different between trials (P = .09) and increased only between day 1 and day 2 (4%; P < .0001). There was no difference between the stopwatch and the sensor determined susual (-0.5 [95% CI: -1.1 to 0.1] m·min; P = .12). The small difference (-2.1 [95% CI: -2.7 to -1.5] m·min; P = .0001) between the methods for sfast was within the CR of the sfast.
In patients with moderate to severe COPD, repeated measures of the susual and sfast using a stopwatch support the use of these tests for simple, quick assessments of disability.
在评估步行速度在慢性阻塞性肺疾病（COPD）中的作用之前，应先评估其可重复性。本研究旨在确定稳定期COPD患者平常（susual）和快速（sfast）步行速度的可重复性，并确定手动测量的准确性。
参与者用秒表计算速度，展示其在10米距离内的susual和sfast；用光学传感器确认准确性。休息5分钟后重复步行；在随后的2天重复该过程。计算两种速度的可重复性系数（CR），并确定其在不同天数间的稳定性。
共有29名参与者（一秒用力呼气量（FEV1）=预测值的43±25%；FEV1/用力肺活量（FVC）=41±13%；susual=60.3±11米·分钟；sfast=74.3±11.5米·分钟）完成了研究。susual和sfast的CR分别为7.5（95%CI：5.0 - 10.0）米·分钟和7.1（95%CI：4.8 - 9.4）米·分钟。每天第二次试验时susual有小幅增加（5%；P <.001），连续天数间也有增加（5%；P <.001）；sfast在各次试验间无差异（P =.09），仅在第1天和第2天间增加（4%；P <.0001）。秒表测量和传感器测量的susual无差异（-0.5[95%CI：-1.1至0.1]米·分钟；P =.12）。两种方法测量sfast的小差异（-2.1[95%CI：-2.7至-1.5]米·分钟；P =.0001）在sfast的CR范围内。
在中重度COPD患者中，使用秒表重复测量susual和sfast支持将这些测试用于简单、快速的残疾评估。
