Effects of placement and orientation of body-fixed accelerometers on the assessment of energy expenditure during walking

Bouten, Cvc Carlijn; Sauren, Aahj Fons; Verduin, M.; Janssen, JD Jan

doi:10.1007/bf02510392

Cited by 123 publications

(86 citation statements)

References 24 publications

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“…Consistent with these findings, higher levels of variability were found when testing across a lower range of frequencies (1.5-2.5 Hz), with a mean intrainstrument CV of 46.4 and interinstrument CV of 42.9 reported [45]. It is therefore recognized that reliability depends on both frequency of movement [19,46] and epoch time [17]. To minimize variability due to these factors, we employed two RT3 accelerometers and each participant wore the same one on each standardized testing procedure with a 1-minute epoch, which is preferred to the shorter epoch in laboratory-based studies [17].…”

Section: Discussionsupporting

confidence: 60%

“…This method of attachment would be similar to freeliving studies, in which individuals would be responsible for attaching the RT3 accelerometer. Bouten et al suggested that the accelerometer should be properly fixed to the body to avoid the sensor moving or jolting on the skin and prevent movement of clothes causing artifacts in the RT3 accelerometer output [46].…”

Section: Discussionmentioning

confidence: 99%

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Construct validity of RT3 accelerometer: A comparison of level-ground and treadmill walking at self-selected speeds

Hendrick¹,

Boyd²,

Low³

et al. 2010

JRRD

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Abstract-This study examined differences in accelerometer output when subjects walked on level ground and on a treadmill. We asked 25 nondisabled participants to wear an RT3 triaxial accelerometer (StayHealthy, Inc; Monrovia, California) and walk at their "normal" and "brisk" walking speeds for 10 minutes. These activities were repeated on a treadmill using the individual speeds from level-ground walking on two occasions 1 week apart. Paired t-tests found a difference in RT3 accelerometer vector magnitude (VM) counts/min between the two walking speeds on both surfaces on days 1 and 2 (p < 0.001). Although we found no significant differences between VM counts/min on the two surfaces at normal and brisk speeds on days 1 and 2 (p > 0.05), we found wide limits of agreement between level ground and treadmill walking at both speeds. Measurement and discrimination of walking intensity employing RT3 accelerometer VM counts/min on the treadmill demonstrated reasonable validity and stability over two time points compared with level-ground walking.

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Section: Discussionsupporting

confidence: 60%

Section: Discussionmentioning

confidence: 99%

Construct validity of RT3 accelerometer: A comparison of level-ground and treadmill walking at self-selected speeds

Hendrick¹,

Boyd²,

Low³

et al. 2010

JRRD

View full text Add to dashboard Cite

show abstract

“…A motion detector, such as an accelerometer, 14 is a relatively inexpensive alternative and commonly used method of objectively measuring physical activity. 6,15 This small instrument, which is worn on the body, measures vertical accelerations on a realtime basis and thus provides a measure of both duration and intensity of physical activity.…”

mentioning

confidence: 99%

Validation of the WHI Brief Physical Activity Questionnaire among Women Diagnosed with Breast Cancer

Johnson-Kozlow¹,

Rock²,

Gilpin³

et al. 2007

am j health behav

152

112

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“…Against a motor-driven rotating arm, the Tracmor Unit shows test-to-test repeatability of 0.5% and when applied acceleration is plotted against Tracmor output, rE0.99 (Bouten et al, 1997a). A second advantage of these units is that the conditions for optimum usage have been defined (eg site of attachment of accelerometer unit) (Bouten et al, 1997b). Third, Tracmor output correlates well with EE (r ¼ 0.95) when subjects walk on a treadmill (Bouten et al, 1994).…”

Section: Discussionmentioning

confidence: 99%

Tracmor system for measuring walking energy expenditure

et al. 2003

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Objective: Walking is an important mode of exercise and is likely to represent a major component of nonexercise activity thermogenesis. The question arises, how best to quantify walking-energy expenditure (EE) in free-living individuals. The triaxial accelerometer for movement registration (Tracmor) is a valid measure of body displacement and so we wanted to evaluate this tool for quantifying walking-EE. Hypothesis: In this study, we test the hypothesis that walking-EE, measured in a Room Calorimeter, can be predicted from Tracmor output using a regression equation derived from a brief Tracmor/treadmill/Metabolic Cart protocol. Design: First, 11 healthy subjects completed a 40-min procedure whereby they wore a Tracmor unit and walked on a treadmill at 0, 1, 2 and 3 mph while EE was measured using a Metabolic Cart. This allowed a regression equation to be defined for each subject to convert Tracmor output to EE. Each subject then entered a Room Calorimeter wearing the Tracmor Unit and walked at two self-selected velocities ('slow', 'fast') while EE was measured. 'Tracmor/regression equation' predictions of walking-EE were compared with Room Calorimeter measurements of walking-EE for the two velocities. Results: The 'Tracmor/regression equation' prediction of EE for walking slowly was 6.3671.67 kJ/min, and for walking fast it was 11.072.60 kJ/min. Room Calorimeter measurements were 6.4371.85 and 10.973.03 kJ/min, respectively. The intraclass correlation coefficient for slow-paced walking was 0.93 (Po0.001), and for fast-paced walking it was 0.82 (Po0.005).

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Effects of placement and orientation of body-fixed accelerometers on the assessment of energy expenditure during walking

Abstract: 1997). Effects of placement and orientation of body-fixed accelerometers on the assessment of energy expenditure during walking. Medical and Biological Engineering and Computing, 35(1), 50-56.

Cited by 123 publications

References 24 publications

Construct validity of RT3 accelerometer: A comparison of level-ground and treadmill walking at self-selected speeds

Construct validity of RT3 accelerometer: A comparison of level-ground and treadmill walking at self-selected speeds

Validation of the WHI Brief Physical Activity Questionnaire among Women Diagnosed with Breast Cancer

Tracmor system for measuring walking energy expenditure

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