Stansfield B, Clarke C, Dall P, Godwin J, Holdsworth R, Granat M
School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.
Division of Population Health Sciences, University of Dundee, Dundee, UK.
Gait Posture. 2015 Feb;41(2):414-9. doi: 10.1016/j.gaitpost.2014.11.002. Epub 2014 Nov 15.
'True cadence' is the rate of stepping during the period of stepping. 'Step accumulation' is the steps within an epoch of time (e.g. 1min). These terms have been used interchangeably in the literature. These outcomes are compared within a population with intermittent claudication (IC). Multiday, 24h stepping activity of those with IC (30) and controls (30) was measured objectively using the activPAL physical activity monitor. 'True cadence' and 'step accumulation' outcomes were calculated. Those with IC took fewer steps/d 6531±2712 than controls 8692±2945 (P=0.003). However, these steps were taken within approximately the same number of minute epochs (IC 301±100min/d; controls 300±70min/d, P=0.894) with only slightly lower true cadence (IC 69 (IQ 66,72) steps/min; controls 72 (IQ 68,76) steps/min, P=0.026), giving substantially lower step accumulation (IC 22 (IQ 19,24) steps/min; controls 30 (IQ 23,34) steps/min) (P<0.001). However, the true cadence of stepping within the blocks of the 1, 5, 20, 30 and 60min with the maximum number of steps accumulated was lower for those with IC than controls (P<0.05). Those with IC took 1300 steps fewer per day above a true cadence of 90 steps/min. True cadence and step accumulation outcomes were radically different for the outcomes examined. 'True cadence' and 'step accumulation' were not equivalent in those with IC or controls. The measurement of true cadence in the population of people with IC provides information about their stepping rate during the time they are stepping. True cadence should be used to correctly describe the rate of stepping as performed.
“真实步频”是指行走期间的步速。“步数累积”是指在一段时间内（如1分钟）的步数。这些术语在文献中常被交替使用。在间歇性跛行（IC）人群中对这些结果进行了比较。使用activPAL身体活动监测仪客观测量了30名IC患者和30名对照组的多日24小时行走活动。计算了“真实步频”和“步数累积”结果。IC患者每天的步数（6531±2712步）少于对照组（8692±2945步）（P = 0.003）。然而，这些步数是在大致相同数量的分钟时间段内完成的（IC患者为301±100分钟/天；对照组为300±70分钟/天，P = 0.894），真实步频仅略低（IC患者为69（四分位距66,72）步/分钟；对照组为72（四分位距68,76）步/分钟，P = 0.026），导致步数累积显著降低（IC患者为22（四分位距19,24）步/分钟；对照组为30（四分位距23,34）步/分钟）（P<0.001）。然而，在累积步数最多的1、5、20、30和60分钟时间段内，IC患者的真实步频低于对照组（P<0.05）。IC患者在真实步频高于90步/分钟时，每天少走1300步。对于所检查的结果，真实步频和步数累积结果有根本差异。在IC患者或对照组中，“真实步频”和“步数累积”并不等同。在IC患者群体中测量真实步频可提供他们行走时步速的信息。应使用真实步频来正确描述实际的步速。
