ArticleJMIR mHealth and uHealth2018
Medical-Grade Physical Activity Monitoring for Measuring Step Count and Moderate-to-Vigorous Physical Activity: Validity and Reliability Study.
Article in JMIR mHealth and uHealth, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 17 papers, 3 of them syntheses that pooled it.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
17 citing papers in PubMed, 3 syntheses or guidelines pooled it, 53 citations in OpenAlex.
- Assessment of 24-hour physical behaviour in adults via wearables: a systematic review of validation studies under laboratory conditions.The international journal of behavioral nutrition and physical activity · 2023Pooled it
- Criterion validity of ActiGraph monitoring devices for step counting and distance measurement in adults and older adults: a systematic review.Journal of neuroengineering and rehabilitation · 2022Pooled it
- Recommendations for determining the validity of consumer wearable and smartphone step count: expert statement and checklist of the INTERLIVE network.British journal of sports medicine · 2021Guideline
- Relationship between Changes in Physical Activity and Knee Health 18 Months after ACL Reconstruction.Medicine and science in sports and exercise · 2025Article
- In-Clinic Activity Promotion for Children With Congenital Heart Disease: Randomized Clinical Trial.CJC pediatric and congenital heart disease · 2025Article
- Sedentary Behavior Patterns After ACL Reconstruction.International journal of exercise science · 2025Article
- 30 Year Trends of Reduced Physical Fitness in Undergraduate Students Studying Human Movement.International journal of environmental research and public health · 2022Article
- The Accuracy of Commercially Available Fitness Trackers in Patients after Stroke.Sensors (Basel, Switzerland) · 2022Article
- Carrying Position-Independent Ensemble Machine Learning Step-Counting Algorithm for Smartphones.Sensors (Basel, Switzerland) · 2022Article
- Participation in Higher Intensity Physical Activity Predicts Lower Depressive Symptom Incidence in College Students.International journal of exercise science · 2022Article
- Greater habitual moderate-to-vigorous physical activity is associated with better executive function and higher prefrontal oxygenation in older adults.GeroScience · 2021Article
- Does aerobic fitness impact prolonged sitting-induced popliteal artery endothelial dysfunction?European journal of applied physiology · 2021Article
- Step Count Standardization: Validation of Step Counts from the Withings Activite using PiezoRxD and wGT3X-BT.Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference · 2020Article
- Meeting international aerobic physical activity guidelines is associated with enhanced cardiovagal baroreflex sensitivity in healthy older adults.Clinical autonomic research : official journal of the Clinical Autonomic Research Society · 2020Article
- Influence of Anthropometrics on Step-Rate Thresholds for Moderate and Vigorous Physical Activity in Older Adults: Scientific Modeling Study.JMIR aging · 2018Article
- Step Rate Thresholds Associated with Moderate and Vigorous Physical Activity in Adults.International journal of environmental research and public health · 2018Article
- Article
Corrections and comments
- Erratum issued
Authors and funding
3 authors at 2 institutions in 1 country.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe 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.
objectiveThe 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.
methodsThe 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.
resultsThe 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).
conclusionsThe 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.
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Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.