University of Alberta, Edmonton, Alberta, Canada.
Spine (Phila Pa 1976). 2009 Oct 15;34(22):2444-9. doi: 10.1097/BRS.0b013e3181b03fc8.
Measurement (validity) study.
To develop and examine reproducibility of a criterion measure of walking capacity for use with lumbar spinal stenosis (LSS) patients, and use this criterion to examine the validity of a treadmill test for the same purpose.
To date, there is no criterion measure of walking capacity advocated for use with LSS populations. Treadmill tests of walking have become more common in LSS literature and research, yet there is insufficient evidence to support the use of these tests as valid outcome measures. Therefore, our aim was to develop a criterion measure and to examine the validity of a treadmill protocol for the measurement of walking capacity in LSS.
A criterion measure of walking capacity in LSS, the self-paced walking test (SPWT) was developed and its test-retest reproducibility examined. Validity of a treadmill test was then examined using the criterion measure for comparison.
The SPWT was found to be highly reproducible with a test-retest intraclass correlation coefficient of 0.98 for total distance walked, in a sample of subjects diagnosed with LSS (n = 33). Although the treadmill test was found to be highly correlated with the SPWT (r = 0.88), 89% of 45 subjects walked further during the SPWT than on the treadmill. Mean walking distances for the SPWT and treadmill test were 987.3 +/- 913.9 m and 611.3 +/- 666.0 m respectively, resulting in a significant difference (P < 0.05) between SPWT and treadmill tests.
The SPWT is presented as a feasible and reproducible criterion measure of walking capacity for use with LSS patients. Although a strong relationship was demonstrated between the treadmill protocol and the SPWT, a systematic bias was observed with patients walking significantly further in the SPWT (36% in mean).
测量（有效性）研究。
为腰椎管狭窄症（LSS）患者开发并检验一种行走能力的标准测量方法的可重复性，并使用该标准来检验跑步机测试的有效性。
迄今为止，尚无推荐用于 LSS 人群的行走能力标准测量方法。跑步机行走测试在 LSS 文献和研究中越来越常见，但没有足够的证据支持这些测试作为有效的结果测量。因此，我们的目标是开发一种标准测量方法，并检验跑步机协议用于测量 LSS 患者行走能力的有效性。
开发了一种腰椎管狭窄症患者行走能力的标准测量方法，即自主 paced 行走测试（SPWT），并检验了其测试-重测的可重复性。然后使用该标准测量方法来检验跑步机测试的有效性。
在一组被诊断为 LSS 的受试者（n=33）中，SPWT 的总行走距离的测试-重测组内相关系数为 0.98，表明其具有高度的可重复性。尽管跑步机测试与 SPWT 高度相关（r=0.88），但 45 名受试者中有 89%在 SPWT 中行走的距离比在跑步机上更远。SPWT 和跑步机测试的平均行走距离分别为 987.3+/-913.9m 和 611.3+/-666.0m，SPWT 和跑步机测试之间存在显著差异（P<0.05）。
SPWT 是一种可行且可重复的腰椎管狭窄症患者行走能力的标准测量方法。尽管跑步机协议与 SPWT 之间显示出很强的关系，但观察到患者在 SPWT 中行走的距离明显更远（平均 36%），存在系统性偏差。
