True cadence and step accumulation are not equivalent : the effect of intermittent claudication on free-living cadence

‘True cadence’ is the rate of stepping during the period of stepping. ‘Step accumulation’ is the stepswithin an epoch of time (e.g. 1 min). These terms have been used interchangeably in the literature. Theseoutcomes are compared within a population with intermittent claudication (IC). Multiday, 24 h steppingactivity of those with IC (30) and controls (30) was measured objectively using the activPAL physicalactivity monitor. ‘True cadence’ and ‘step accumulation’ outcomes were calculated. Those with IC tookfewer steps/d 6531 ± 2712 than controls 8692 ± 2945 (P = 0.003). However, these steps were taken withinapproximately the same number of minute epochs (IC 301 ± 100 min/d; controls 300 ± 70 min/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 60 min with themaximum number of steps accumulated was lower for those with IC than controls (P < 0.05). Those with ICtook 1300 steps fewer per day above a true cadence of 90 steps/min. True cadence and step accumulationoutcomes were radically different for the outcomes examined. ‘True cadence’ and ‘step accumulation’ werenot equivalent in those with IC or controls. The measurement of true cadence in the population of people withIC provides information about their stepping rate during the time they are stepping. True cadence should beused to correctly describe the rate of stepping as performed