Intermonitor Variability of the RT3 Accelerometer during Typical Physical Activities

Powell, Sarah M.; Rowlands, Alex V.

doi:10.1249/01.mss.0000113743.68789.36

Cited by 87 publications

(63 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The methodological criteria were developed according to previous detailed procedures (Janney, 2012;Powell, Jones, & Rowlands, 2003;Powell & Rowlands, 2004;Rowlands, Thomas, Eston, & Topping, 2004;Sharpe, 2007;. Based on this a set of criteria were established for the included studies.…”

Section: Technique 1: a Summary Of Outcome Measures Usedmentioning

confidence: 99%

“…Accelerometers (notably the RT3) have been used as the criterion measure, despite the caution of their use and accuracy in determining activity energy expenditure (Sharpe et al, 2006a) and errors generated by equations used to categorize and define physical activity in OBM (Prince et al, 2008). The RT3 is suggested to be an appropriate criterion measure (Eston, Rowlands, & Ingledew, 1998;Powell & Rowlands, 2004;Powell et al, 2003) and sensitive in capturing and distinguishing time spent at different intensities of physical activity Yamamoto et al, 2011).…”

Section: What Outcome Measure Should Be Chosen For Use?mentioning

confidence: 99%

See 1 more Smart Citation

Selection, Use and Psychometric Properties of Physical Activity Measures to Assess Individuals with Severe Mental Illness: A Narrative Synthesis

Soundy¹,

Roskell²,

Stubbs³

et al. 2014

Archives of Psychiatric Nursing

129

View full text Add to dashboard Cite

a b s t r a c tThis research provides a critical consideration of the outcome measures used to assess physical activity in individuals with severe mental illness. A narrative synthesis was utilised to provide a simple juxtapose of the current research. A sensitive topic-based search strategy was conducted in order to identify studies that met the eligibility criteria. Fifty two studies met the inclusion criteria and 5 were identified specially as validation studies. The current research identified several methodological shortcomings. The justification and choice of outcome measure used is often weak and only five studies have validated a specific outcome measure of physical activity. Within these validation studies, the validation process often lacked a consideration of agreement between measures. Accelerometers have been most frequently used as a criterion measure, notably the RT3 tri-axial accelerometer. Objective based measures may be best placed to consider physical activity levels, although, methodological considerations for the utilization of such tools is required. Self-report questionnaires have benefits for use in this population but require further validation. Researchers and clinicians need to carefully consider what outcome measure they are using and be aware of the development, scope and purpose of that measure.Crown

show abstract

Section: Technique 1: a Summary Of Outcome Measures Usedmentioning

confidence: 99%

Section: What Outcome Measure Should Be Chosen For Use?mentioning

confidence: 99%

Selection, Use and Psychometric Properties of Physical Activity Measures to Assess Individuals with Severe Mental Illness: A Narrative Synthesis

Soundy¹,

Roskell²,

Stubbs³

et al. 2014

Archives of Psychiatric Nursing

129

View full text Add to dashboard Cite

show abstract

“…Validation and reliability of the RT3 accelerometer for free-living research has been assessed under a number of laboratory-based conditions, including walking and running at standardized speeds on a treadmill [11,[14][15][16][17], using a shaker table [18][19], assessing various mobility tasks [3], and performing structured activities [20]. A recent study has also demonstrated the ability of the RT3 accelerometer to discriminate between a series of standardized laboratory-based activities [21]; however, the ability of RT3 accelerometer vector magnitude (VM) counts to discriminate specific activities in free living has yet to be established.…”

Section: Introductionmentioning

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

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.

show abstract

“…However, their output is highly variable and difficult to put into clinical context. Interpretation depends on calibration equations and cutoff points for defining light, moderate, vigorous, and total activity [10][11][12][13][14][15]. To date, these cutoff points have been defined for nondisabled, young adults in the supervised setting with correlations to maximum oxygen consumption on cardiopulmonary exercise tests, not during free-living conditions in the population being studied.…”

Section: Introductionmentioning

confidence: 99%

Accuracy of uniaxial accelerometer in chronic obstructive pulmonary disease

Moy¹

2008

JRRD

View full text Add to dashboard Cite

Abstract-Wearable sensors have been developed and used in nondisabled adults. Little is known about their accuracy in patients with chronic disease. We tested the ActiHealth accelerometer, which measures step counts, in subjects with chronic obstructive pulmonary disease (COPD). We determined the intra-and interdevice coefficients of variation (CVs). We assessed the accuracy of the device in 15 nondisabled males and 46 subjects with COPD. Accuracy was defined as percent step capture, (device step count divided by manual step count) times 100. Predictors of percent step capture were identified using linear regression methods. The accelerometer has an intradevice CV ranging from 0.008 to 0.025 and an interdevice CV of 0.64. In nondisabled males, median percent step capture was 96% (interquartile range 81%-98%). In subjects with COPD, median percent step capture was 86% (interquartile range 72%-96%). Usual walking speed was the most important predictor of percent step capture (p = 0.004). The ActiHealth accelerometer has acceptable intra-and interdevice CVs. It is highly accurate in nondisabled subjects. The accuracy declines in subjects with COPD based on walking speed. Prior to using the ActiHealth accelerometer, researchers and clinicians should assess walking speed and percent step capture in each subject.

show abstract

Intermonitor Variability of the RT3 Accelerometer during Typical Physical Activities

Abstract: Reliability of the RT3 is good; however, intermonitor variability exists. The vertical axis of the RT3 accelerometer showed the least variability and was the most reliable. It is recommended that intermonitor variability and reliability of RT3 on each axis be assessed before use.

Cited by 87 publications

References 18 publications

Selection, Use and Psychometric Properties of Physical Activity Measures to Assess Individuals with Severe Mental Illness: A Narrative Synthesis

Selection, Use and Psychometric Properties of Physical Activity Measures to Assess Individuals with Severe Mental Illness: A Narrative Synthesis

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

Accuracy of uniaxial accelerometer in chronic obstructive pulmonary disease

Contact Info

Product

Resources

About