scholarly journals Validity of Wrist-Worn Activity Trackers for Estimating VO2max and Energy Expenditure

2019 ◽  
Vol 16 (17) ◽  
pp. 3037 ◽  
Author(s):  
Stefanie Passler ◽  
Julian Bohrer ◽  
Lukas Blöchinger ◽  
Veit Senner
Keyword(s):  
Health Care ◽  
Energy Expenditure ◽  
Gold Standard ◽  
Healthy Subjects ◽  
Intraclass Correlation ◽  
Standard Methods ◽  
Paired Sample ◽  
Activity Trackers ◽  
Health Care Applications ◽  
Scientific Validation

Activity trackers are a simple and mostly low-priced method to capture physiological parameters. Despite the high number of wrist-worn devices, there is a lack of scientific validation. The purpose of this study was to assess whether the activity trackers represent a valid alternative to gold-standard methods in terms of estimating energy expenditure (EE) and maximum oxygen uptake (VO2max). Twenty-four healthy subjects participated in this study. In total, five commercially available wrist-worn devices were tested with regard to their validity of EE and/or VO2max. Estimated values were compared with indirect calorimetry. Validity of the activity trackers was determined by paired sample t-tests, mean absolute percentage errors (MAPE), Intraclass Correlation Coefficient, and Bland-Altman plots. Within the tested devices, differences in scattering in VO2max and EE could be observed. This results in a MAPE > 10% for all evaluations, except for the VO2max-estimation of the Garmin Forerunner 920XT (7.3%). The latter significantly underestimates the VO2max (t(23) = –2.37, p = 0.027), whereas the Garmin Vivosmart HR significantly overestimates the EE (t(23) = 2.44, p = 0.023). The tested devices did not show valid results concerning the estimation of VO2max and EE. Hence, the current wrist-worn activity trackers are most likely not accurate enough to be used for neither purposes in sports, nor in health care applications.

scholarly journals P107: Use of activity trackers to count steps of older emergency department patients: a feasibility and validity study

CJEM ◽  
2020 ◽  
Vol 22 (S1) ◽  
pp. S103-S103
Author(s):  
J. Estrada-Codecido ◽  
J. Lee ◽  
M. Chignell ◽  
C. Whyne
Keyword(s):  
Gold Standard ◽  
Eligible Patient ◽  
Intraclass Correlation ◽  
Functional Decline ◽  
Activity Trackers ◽  
Potential Marker ◽  
Final Estimate ◽  
Emergency Department Patients ◽  
A Prospective Study ◽  
Tracking Devices

Introduction: Mobility is an evidence-based non-pharmacologic strategy shown to reduce delirium and functional decline among older patients in the acute care setting. Activity trackers have been used in previous studies to objectively measure mobility in older hospitalized patients. This study aims to compare the feasibility and validate the accuracy of three accelerometer-based activity trackers (Fitbit Zip, Fitbit Charge HR and StepWatch). This is the first step in a program of research to objectively measure as a potential marker of delirium risk. Methods: This is a prospective study of patients 65 years of age and older during their ED visit. We excluded those with critical illness, unable to communicate or provide consent; and any ambulatory impediments. Consenting participants wore the trackers for up to 8 hour, and completed a 6-meter walk test while a research assistant manually counted their steps. Our primary feasibility measure was the proportion of eligible patient for which we were able to recover the tracker and recorded their steps. The primary validation endpoint was the concordance between steps recorded by the tracker compared to a gold standard manual step count over a fixed distance. Sample size was based on the desired precision of the final estimate of feasibility. Intraclass correlation coefficient (ICC) was calculated to assess agreements between devices and manual count. We will report proportions with exact binomial 95% confidence intervals (CI) for feasibility and validity endpoints. Results: 41 participants were enrolled in this study. Mean age was 74.6 years (+/- 5.76) and 59% were females. The total subjects that wore the Fitbit Zip, Fitbit Charge HR and StepWatch during study participation was, 40/41 (97.5%, CI 0.87–0.99), 33/34 (97%, CI 0.84–0.99) and 31/32 (96.8%, CI 0.83–0.99), respectively. Total subjects with completed data extracted from the Fitbit Zip, Fitbit Charge HR and StepWatch was, 38/41 subjects (92.6%, CI 0.80–0.98), 34 (100%, CI 0.89–1.00), and 32 (100%, CI 0.89–1.00), respectively. All devices were recovered after use (100%, 95%CI 0.91–100). Conclusion: Our results suggest: 1) the use of gait-tracking devices in the ED is feasible, 2) consumer and research-grade devices showed good validity against the gold standard, and 3) the use of small, inexpensive, consumer-grade trackers to objectively measure mobility of older adults in the ED.

scholarly journals Automated alternate cover test for ‘HINTS’ assessment: a validation study

2021 ◽  
Author(s):  
Miranda Morrison ◽  
Hassen Kerkeni ◽  
Athanasia Korda ◽  
Simone Räss ◽  
Marco D. Caversaccio ◽  
...  
Keyword(s):  
Gold Standard ◽  
Healthy Subjects ◽  
Quantitative Method ◽  
Intraclass Correlation ◽  
Eye Position ◽  
Acute Vestibular Syndrome ◽  
Significant Difference ◽  
Contralateral Eye ◽  
Cover Test ◽  
Good Agreement

Abstract Objective The alternate cover test (ACT) in patients with acute vestibular syndrome is part of the ‘HINTS’ battery test. Although quantitative, the ACT is highly dependent on the examiner’s experience and could theoretically vary greatly between examiners. In this study, we sought to validate an automated video-oculography (VOG) system based on eye tracking and dedicated glasses. Methods We artificially induced a vertical strabismus to simulate a skew deviation on ten healthy subjects, aged from 26 to 66, using different press-on Fresnel prisms on one eye while recording eye position with VOG of the contralateral eye. We then compared the system’s performance to that of a blinded trained orthoptist using conventional, semi-quantitative method of skew measurement known as the alternate prism cover test (APCT) as a gold standard. Results We found a significant correlation between the reference APCT and the Skew VOG (Pearson’s R2 = 0.606, p < 0.05). There was a good agreement between the two tests (intraclass correlation coefficient 0.852, 95 CI 0.728–0.917, p < 0.001). The overall accuracy of the VOG was estimated at 80.53% with an error rate of 19.46%. There was no significant difference in VOG skew estimations compared with the gold standard except for very small skews. Conclusions VOG offers an objective and quantitative skew measurement and proved to be accurate in measuring vertical eye misalignment compared to the ACT with prisms. Precision was moderate, which mandates a sufficient number of tests per subject.

Biocompatible, Flexible and Conductive Polymers Prepared by Biomass-derived Ionic Liquid Treatment

2021 ◽  
Author(s):  
Yannan Lu ◽  
Ruqing Lu ◽  
Xiaochun Hang ◽  
David James Young
Keyword(s):  
Health Care ◽  
Ionic Liquid ◽  
Conductive Polymers ◽  
Conductive Polymer ◽  
Post Treatment ◽  
Integrated Electronics ◽  
Ionic Liquid Treatment ◽  
Health Care Applications

Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) is a promising, biocompatible conductive polymer for bio-integrated electronics with health-care applications. However, the intrinsic biocompatibility of PEDOT: PSS is potentially jeopardized by post-treatment additives such as ionic...

scholarly journals 118. Eliminating Blood Culture Contamination with an Initial-specimen Diversion Device

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S187-S187
Author(s):  
Lucy S Tompkins ◽  
Alexandra Madison ◽  
Tammy Schaffner ◽  
Jenny Tran ◽  
Pablito Ang
Keyword(s):  
Health Care ◽  
Blood Culture ◽  
Nursing Staff ◽  
False Positive ◽  
Blood Cultures ◽  
Traditional Methods ◽  
Standard Methods ◽  
Candida Sp ◽  
Initial Specimen ◽  
Skin Flora

Abstract Background Blood samples obtained via traditional venipuncture can become contaminated by superficial and deeply embedded skin flora. We evaluated the hospital-wide use of an initial-specimen diversion device (ISDD) designed to shunt these microorganisms away from the culture bottle to reduce blood culture contamination (BCC) and sequelae: false-positive central line-associated bloodstream infections (CLABSIs), repeat blood culture draws, inappropriate antibiotic usage, increased patient length-of-stay and misdiagnosis. The study aimed to show the proportion of blood cultures containing contaminants drawn by phlebotomy staff using the ISDD versus those drawn using traditional methods. Nursing staff continued to use traditional methods to draw blood cultures in the emergency department (ED) and from inpatients. Methods Over a four-month trial at Stanford Health Care (SHC), 4,462 blood cultures were drawn by phlebotomy staff using the ISDD (Steripath Gen2, Magnolia Medical Technologies) in the ED and from inpatients; 922 blood cultures were obtained by phlebotomy staff using standard methods. Additionally, 1,413 blood cultures were drawn by nursing staff using standard methods. The number of matched sets (2 bottles [aerobic/anaerobic] plus 2 bottles [aerobic/anaerobic], with total volume 40 ml) obtained through traditional methods and by the ISDD were recorded. Contaminants were defined by the National Healthcare Safety Network (NHSN). In addition, sets in which 1 out of 4 bottles contained vancomycin-resistant Enterococcus (VRE) or Candida sp. were also recorded, even though these are not considered contaminants by the NHSN. Results Of 4,462 blood cultures obtained using the ISDD there were zero contaminants found (BCC rate 0%) versus 29 contaminated sets using traditional methods (BCC rate 3.15%). Twenty-eight contaminants were observed from nursing staff blood culture draws (BCC rate 1.98%). Zero false-positive CLABSIs were associated with use of the ISDD for the trial period. No matched sets containing 1 of 4 bottles with VRE or Candida sp. were observed. Table Stanford Health Care blood culture collection methods and contamination events (March 15, 2019 - July 21, 2019) Conclusion The trial results encourage adoption of the ISDD as standard practice for blood culture at SHC. Disclosures All Authors: No reported disclosures

Daily Energy Expenditure and Its Relation to Health Care Costs in Patients Undergoing Ambulatory Electrocardiographic Monitoring

2017 ◽  
Vol 119 (4) ◽  
pp. 658-663 ◽  
Author(s):  
Jason George ◽  
Rami Khoury Abdulla ◽  
Raymond Yeow ◽  
Anshul Aggarwal ◽  
Judith Boura ◽  
...  
Keyword(s):  
Health Care ◽  
Energy Expenditure ◽  
Health Care Costs ◽  
Daily Energy Expenditure ◽  
Electrocardiographic Monitoring ◽  
Daily Energy ◽  
Care Costs

DiaM- Integrated Mobile-Based Diabetes Management

2021 ◽  
Vol 9 (4) ◽  
pp. 470-478
Keyword(s):  
Health Care ◽  
Mobile Application ◽  
Diabetes Management ◽  
Sleep Time ◽  
Eating Habit ◽  
Unhealthy Lifestyle ◽  
Health Care Applications ◽  
Will Power ◽  
Lifestyle Disease ◽  
Day By Day

Mobile technology is showing a wide acceptance in the health-care system. As technology is changing there are many health-care applications in the market. The need of these applications is increasing day by day because of unhealthy lifestyle. Among the various ailments, the most common lifestyle disease is diabetes. As we know diabetes can’t be cured, it can only be controlled by managing one’s lifestyle. In this paper, we propose a new application DiaM for managing and mentoring a diabetic patient. DiaM is Artificial Intelligence (AI) based mobile application which not only connect to manage one’s lifestyle but to build the strong will power. Our application has been designed in such a way that all the aspects are covered to manageone’s lifestyle. We have implemented an AI based system which smartly categorizes the patients in different states, which utilizes the different parameter like eating habit, stress, exercise, sleep time, smoking, genetic, BMI, and various other symptoms. On the basis of these states suggestions are been provided to the patient for improving the lifestyle. DiaM also enables patient to connect with the Doctor for monitoring and mentoring. Our application provides real-time alerts to doctor so that they can monitor patient anytime. It is extremely necessary to manage health conditions therefore our application provides a better,accurate and sustainable healthcare system.

scholarly journals The Slow March toward Rapid Phenotypic Antimicrobial Susceptibility Testing: Are We There Yet?

2018 ◽  
Vol 56 (4) ◽  
pp. e01999-17 ◽  
Author(s):  
Christopher D. Doern
Keyword(s):  
Antimicrobial Susceptibility ◽  
Rapid Growth ◽  
Gold Standard ◽  
Historical Perspective ◽  
Susceptibility Testing ◽  
Turnaround Time ◽  
Antimicrobial Susceptibility Testing ◽  
Standard Methods ◽  
Phenotypic Susceptibility ◽  
Made In

ABSTRACT Antimicrobial susceptibility testing (AST) provides critical information for the management of patients with infections. The gold standard methods for assessing organism susceptibility are still based on growth and require incubation over relatively long periods of time. Until now, little progress has been made in developing rapid, growth-based, phenotypic AST systems. This commentary puts the recently FDA-cleared Accelerate PhenoTest (P. Pancholi et al., J Clin Microbiol 56:e01329-17, 2018, https://doi.org/10.1128/JCM.01329-17) in context by providing a historical perspective on attempts to accelerate phenotypic susceptibility results. In addition, some promising new innovations that promise to shorten the turnaround time for phenotypic AST will be briefly reviewed.

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