scholarly journals Correction: Medical-Grade Physical Activity Monitoring for Measuring Step Count and Moderate-to-Vigorous Physical Activity: Validity and Reliability Study (Preprint)

2018 ◽  
Author(s):  
Myles William O'Brien ◽  
William Robert Wojcik ◽  
Jonathon Richard Fowles
Keyword(s):  
Physical Activity ◽  
Vigorous Physical Activity ◽  
Activity Monitoring ◽  
Step Count ◽  
Validity And Reliability ◽  
Reliability Study ◽  
Physical Activity Monitoring ◽  
Medical Grade

scholarly journals Medical-Grade Physical Activity Monitoring for Measuring Step Count and Moderate-to-Vigorous Physical Activity: Validity and Reliability Study (Preprint)

2018 ◽  
Author(s):  
Myles William O'Brien ◽  
William Robert Wojcik ◽  
Jonathon Richard Fowles
Keyword(s):  
Physical Activity ◽  
Vigorous Physical Activity ◽  
Intraclass Correlation ◽  
Step Count ◽  
Validity And Reliability ◽  
Step Rate ◽  
Physical Activity Monitoring ◽  
Adult Participants ◽  
Step Counting ◽  
Medical Grade

BACKGROUND The use of physical activity (PA) monitors is commonly associated with an increase in habitual PA level in healthy and clinical populations. The PiezoRx is a medical-grade PA monitor that uses adjustable step rate thresholds to estimate moderate-to-vigorous physical activity (MVPA) and is a valid indicator of free-living PA in adults. Laboratory validation of step count derived MVPA in adults is needed to justify the use of these monitors in clinical practice to track individuals’ progress toward meeting PA guidelines that are based on MVPA, not steps. OBJECTIVE The objective of our study was to assess the validity and interinstrument reliability of the PiezoRx to derive step count and MVPA in a laboratory setting compared with criterion measures and other frequently used PA monitors in a diverse sample of adults. METHODS The adult participants (n=43; 39.4 years, SD 15.2) wore an Omron HJ-320 pedometer, an ActiGraph GT3X accelerometer, and four PiezoRx monitors during a progressive treadmill protocol conducted for 6 minutes at speeds of 2.4, 3.2, 4.0, 5.6, 6.4, and 7.2 km/hour, respectively. The four PiezoRx monitors were set at different MVPA step rate thresholds (MPA in steps/minute/VPA in steps/minute) 100/120, 110/130, height adjusted, and height+fitness adjusted. RESULTS The PiezoRx was more correlated (intraclass correlation, ICC=.97; P<.001) to manual step counting than the ActiGraph (ICC=.72; P<.001) and Omron (ICC=.62; P<.001). The PiezoRxs absolute percent error in measuring steps was 2.2% (ActiGraph=15.9%; Omron=15.0%). Compared with indirect calorimetry, the height-adjusted PiezoRx and ActiGraph were accurate measures of the time spent in MVPA (both ICC=.76; P<.001). CONCLUSIONS The PiezoRx PA monitor appears to be a valid and reliable measure of step count and MVPA in this diverse sample of adults. The device’s ability to measure MVPA may be improved when anthropometric differences are considered, performing at par or better than a research grade accelerometer.

scholarly journals Physical activity monitoring to assess disability progression in multiple sclerosis

2020 ◽  
Vol 6 (4) ◽  
pp. 205521732097518
Author(s):  
Charlotte M Stuart ◽  
Aravinthan Varatharaj ◽  
Janine Domjan ◽  
Sheaba Philip ◽  
Ian Galea ◽  
...  
Keyword(s):  
Physical Activity ◽  
Multiple Sclerosis ◽  
Brain Atrophy ◽  
Outcome Measurement ◽  
Activity Monitoring ◽  
Step Count ◽  
Brain Volume Loss ◽  
Metabolic Equivalents ◽  
Physical Activity Monitoring ◽  
Convergent And Divergent Validity

Background Clinical outcome measurement in multiple sclerosis (MS) usually requires a physical visit. Remote activity monitoring (RAM) using wearable technology provides a rational alternative, especially desirable when distance is involved or in a pandemic setting. Objective To validate RAM in progressive MS using (1) traditional psychometric methods (2) brain atrophy. Methods 56 people with progressive MS participated in a longitudinal study over 2.5 years. An arm-worn RAM device measured activity over six days, every six months, and incorporated triaxial accelerometry and transcutaneous physiological variable measurement. Five RAM variables were assessed: physical activity duration, step count, active energy expenditure, metabolic equivalents and a composite RAM score incorporating all four variables. Other assessments every six months included EDSS, MSFC, MSIS-29, Chalder Fatigue Scale and Beck’s Depression Inventory. Annualized brain atrophy was measured using SIENA. Results RAM was tolerated well by people with MS; the device was worn 99.4% of the time. RAM had good convergent and divergent validity and was responsive, especially with respect to step count. Measurement of physical activity over one day was as responsive as six days. The composite RAM score positively correlated with brain volume loss. Conclusion Remote activity monitoring is a valid and acceptable outcome measure in MS.

scholarly journals Validity and Reliability of Fitbit Flex for Step Count, Moderate to Vigorous Physical Activity and Activity Energy Expenditure

PLoS ONE ◽  
2016 ◽  
Vol 11 (9) ◽  
pp. e0161224 ◽  
Author(s):  
Ashleigh Sushames ◽  
Andrew Edwards ◽  
Fintan Thompson ◽  
Robyn McDermott ◽  
Klaus Gebel
Keyword(s):  
Physical Activity ◽  
Energy Expenditure ◽  
Vigorous Physical Activity ◽  
Step Count ◽  
Validity And Reliability ◽  
Activity Energy

scholarly journals Step-count guidelines referenced on 60-minutes of moderate/vigorous physical activity

2015 ◽  
Vol 21 (1) ◽  
pp. 92-99
Author(s):  
Fabio Eduardo Fontana ◽  
Michael Pereira da Silva ◽  
Ripley Marston ◽  
Kevin Finn ◽  
Jere Gallagher
Keyword(s):  
Physical Activity ◽  
Diagnostic Accuracy ◽  
Vigorous Physical Activity ◽  
Roc Curves ◽  
Sixth Grade ◽  
Step Count ◽  
Step Counts ◽  
Sixth Grade Students ◽  
Good Diagnostic Accuracy ◽  
Full Day

The purpose of this study was to establish step-count guidelines for sixth-grade students and assess the ability of step-counts to discriminate between students achieving and not achieving 60-minutes of moderate to vigorous physical activity daily. 201 sixth-grade students completed the study. They wore a pedometer and an accelerometer at the waist level for one full day. ROC curves were used to establish step-count guidelines and determine the diagnostic accuracy of step-counts. Sixth grade students need 12,118 steps/day to reach adequate daily levels of physical activity. The AUC indicated good diagnostic accuracy of step-counts. Suggested step-count guidelines can be a useful tool for identifying children who need to increase their daily levels of physical activity. The step-count cutoff proposed in this study is adequate for discriminating between sixth grade students reaching and not reaching recommended levels of physical activity.

Sign in / Sign up

Export Citation Format

Share Document