Motion Sensor Accuracy under Controlled and Free-Living Conditions

Abstract

Different brands of motion sensors detect steps differently; therefore, caution must be used when comparing step counts between studies that have employed different brands of motion sensors. Taking into consideration the results of both studies and the initial walking test used for instrument screening purposes, it appears that, of the three pedometers tested, the YAM pedometer is most consistently accurate under both controlled and free-living conditions. Future research must consider presenting motion sensor accuracy in absolute terms so that the magnitude of error is not underestimated.

UK adults exhibit higher step counts in summer compared to winter months

“…The SW pedometer range has been shown to accurately detect steps in controlled laboratory (Le Masurier and Tudor-Locke 2003;Swartz et al 2003;Melanson et al 2004) and freeliving conditions (Le Masurier et al 2004;Schneider et al 2004) and has consequently been employed in numerous free-living activity studies (Chan et al 2004;Tudor-Locke et al 2004b;Hornbuckle et al 2005). The pedometer accurately assesses walking activity of all BMI classifications (Swartz et al 2003).…”

Physical activity and depressive symptoms in older adults

“…19 Only one study in Japan has used a form of objective measurement (an accelerometer) to assess physical activity, and this study reported a significant negative relationship between depressive mood and physical activity. 12 Pedometer is another tool for measurement of physical activity commonly used in other studies; however, it is not sensitive to slow activity or shuffling gaits 20,21 and it also motivates physical activity, 22,23 so it may either under or overestimate physical activity in older adults.…”

Pedometer step counting in South Africa: tools or trinkets?

“…A cover over the control buttons prevents the unit from being inadvertently reset or stopped. The DW is considered accurate 5,6,9,21,32 and durable, 24 and has been used for large-scale surveys 4,36 and in experimental trials. 16,27 The DW is a popular brand of pedometer and has been used in public health initiatives similar in concept to the Kellogg's and Discovery initiatives.…”

“…12 Although the marketing initiatives of Kellogg's South Africa and Discovery Health are laudable, the accuracy and longevity of the pedometers are not reported. Calibration studies have found that the accuracy 5,9,21,22,25,32 and longevity 24 of pedometers vary considerably between brands. Recent validation trials of promotional pedometers in Europe 10 and North America 14,37 have found poor instrument accuracy and consistency.…”