J. Med. Internet Res. - Comparison of physical activity measures using mobile phone-based CalFit and Actigraph.


{ activ(1452) weight(1219) physic(1104) }
{ measur(2081) correl(1212) valu(896) }
{ age(1611) year(1155) adult(843) }
{ time(1939) patient(1703) rate(768) }
{ design(1359) user(1324) use(1319) }
{ model(2220) cell(1177) simul(1124) }
{ monitor(1329) mobil(1314) devic(1160) }
{ error(1145) method(1030) estim(1020) }
{ howev(809) still(633) remain(590) }
{ patient(2315) diseas(1263) diabet(1191) }
{ activ(1138) subject(705) human(624) }
{ survey(1388) particip(1329) question(1065) }
{ estim(2440) model(1874) function(577) }
{ can(774) often(719) complex(702) }
{ record(1888) medic(1808) patient(1693) }
{ health(3367) inform(1360) care(1135) }
{ patient(1821) servic(1111) care(1106) }
{ high(1669) rate(1365) level(1280) }
{ implement(1333) system(1263) develop(1122) }
{ process(1125) use(805) approach(778) }
{ method(1969) cluster(1462) data(1082) }
{ model(3404) distribut(989) bayesian(671) }
{ imag(1947) propos(1133) code(1026) }
{ sequenc(1873) structur(1644) protein(1328) }
{ method(1219) similar(1157) match(930) }
{ network(2748) neural(1063) input(814) }
{ studi(2440) review(1878) systemat(933) }
{ assess(1506) score(1403) qualiti(1306) }
{ chang(1828) time(1643) increas(1301) }
{ learn(2355) train(1041) set(1003) }
{ general(901) number(790) one(736) }
{ method(984) reconstruct(947) comput(926) }
{ model(2656) set(1616) predict(1553) }
{ cost(1906) reduc(1198) effect(832) }
{ sampl(1606) size(1419) use(1276) }
{ decis(3086) make(1611) patient(1517) }
{ data(1737) use(1416) pattern(1282) }
{ inform(2794) health(2639) internet(1427) }
{ system(1976) rule(880) can(841) }
{ imag(1057) registr(996) error(939) }
{ bind(1733) structur(1185) ligand(1036) }
{ featur(3375) classif(2383) classifi(1994) }
{ imag(2830) propos(1344) filter(1198) }
{ imag(2675) segment(2577) method(1081) }
{ take(945) account(800) differ(722) }
{ motion(1329) object(1292) video(1091) }
{ treatment(1704) effect(941) patient(846) }
{ surgeri(1148) surgic(1085) robot(1054) }
{ framework(1458) process(801) describ(734) }
{ problem(2511) optim(1539) algorithm(950) }
{ concept(1167) ontolog(924) domain(897) }
{ clinic(1479) use(1117) guidelin(835) }
{ algorithm(1844) comput(1787) effici(935) }
{ extract(1171) text(1153) clinic(932) }
{ method(1557) propos(1049) approach(1037) }
{ data(1714) softwar(1251) tool(1186) }
{ control(1307) perform(991) simul(935) }
{ care(1570) inform(1187) nurs(1089) }
{ search(2224) databas(1162) retriev(909) }
{ featur(1941) imag(1645) propos(1176) }
{ case(1353) use(1143) diagnosi(1136) }
{ data(3963) clinic(1234) research(1004) }
{ studi(1410) differ(1259) use(1210) }
{ risk(3053) factor(974) diseas(938) }
{ perform(999) metric(946) measur(919) }
{ research(1085) discuss(1038) issu(1018) }
{ system(1050) medic(1026) inform(1018) }
{ import(1318) role(1303) understand(862) }
{ model(2341) predict(2261) use(1141) }
{ visual(1396) interact(850) tool(830) }
{ compound(1573) activ(1297) structur(1058) }
{ perform(1367) use(1326) method(1137) }
{ studi(1119) effect(1106) posit(819) }
{ blood(1257) pressur(1144) flow(957) }
{ spatial(1525) area(1432) region(1030) }
{ model(3480) simul(1196) paramet(876) }
{ ehr(2073) health(1662) electron(1139) }
{ state(1844) use(1261) util(961) }
{ research(1218) medic(880) student(794) }
{ patient(2837) hospit(1953) medic(668) }
{ data(2317) use(1299) case(1017) }
{ medic(1828) order(1363) alert(1069) }
{ signal(2180) analysi(812) frequenc(800) }
{ group(2977) signific(1463) compar(1072) }
{ gene(2352) biolog(1181) express(1162) }
{ data(3008) multipl(1320) sourc(1022) }
{ first(2504) two(1366) second(1323) }
{ intervent(3218) particip(2042) group(1664) }
{ use(2086) technolog(871) perceiv(783) }
{ can(981) present(881) function(850) }
{ analysi(2126) use(1163) compon(1037) }
{ health(1844) social(1437) communiti(874) }
{ structur(1116) can(940) graph(676) }
{ cancer(2502) breast(956) screen(824) }
{ use(976) code(926) identifi(902) }
{ use(1733) differ(960) four(931) }
{ drug(1928) target(777) effect(648) }
{ result(1111) use(1088) new(759) }
{ method(2212) result(1239) propos(1039) }
{ detect(2391) sensit(1101) algorithm(908) }


CKGROUND: Epidemiological studies on physical activity often lack inexpensive, objective, valid, and reproducible tools for measuring physical activity levels of participants. Novel sensing technologies built into smartphones offer the potential to fill this gap.OBJECTIVE: We sought to validate estimates of physical activity and determine the usability for large population-based studies of the smartphone-based CalFit software.METHODS: A sample of 36 participants from Barcelona, Spain, wore a smartphone with CalFit software and an Actigraph GT3X accelerometer for 5 days. The ease of use (usability) and physical activity measures from both devices were compared, including vertical axis counts (VT) and duration and energy expenditure predictions for light, moderate, and vigorous intensity from Freedson's algorithm. Statistical analyses included (1) Kruskal-Wallis rank sum test for usability measures, (2) Spearman correlation and linear regression for VT counts, (3) concordance correlation coefficient (CCC), and (4) Bland-Altman plots for duration and energy expenditure measures.RESULTS: Approximately 64% (23/36) of participants were women. Mean age was 31 years (SD 8) and mean body mass index was 22 kg/m(2) (SD 2). In total, 25/36 (69%) participants recorded at least 3 days with at least 10 recorded hours of physical activity using CalFit. The linear association and correlations for VT counts were high (adjusted R(2)=0.85; correlation coefficient .932, 95% CI 0.931-0.933). CCCs showed high agreement for duration and energy expenditure measures (from 0.83 to 0.91).CONCLUSIONS: The CalFit system had lower usability than the Actigraph GT3X because the application lacked a means to turn itself on each time the smartphone was powered on. The CalFit system may provide valid estimates to quantify and classify physical activity. CalFit may prove to be more cost-effective and easily deployed for large-scale population health studies than other specialized instruments because cell phones are already carried by many people.

Resumo Limpo

ckground epidemiolog studi physic activ often lack inexpens object valid reproduc tool measur physic activ level particip novel sens technolog built smartphon offer potenti fill gapobject sought valid estim physic activ determin usabl larg populationbas studi smartphonebas calfit softwaremethod sampl particip barcelona spain wore smartphon calfit softwar actigraph gtx acceleromet day eas use usabl physic activ measur devic compar includ vertic axi count vt durat energi expenditur predict light moder vigor intens freedson algorithm statist analys includ kruskalw rank sum test usabl measur spearman correl linear regress vt count concord correl coeffici ccc blandaltman plot durat energi expenditur measuresresult approxim particip women mean age year sd mean bodi mass index kgm sd total particip record least day least record hour physic activ use calfit linear associ correl vt count high adjust r correl coeffici ci cccs show high agreement durat energi expenditur measur conclus calfit system lower usabl actigraph gtx applic lack mean turn time smartphon power calfit system may provid valid estim quantifi classifi physic activ calfit may prove costeffect easili deploy largescal popul health studi special instrument cell phone alreadi carri mani peopl

Resumos Similares

J. Med. Internet Res. - How valid are Web-based self-reports of weight? ( 0,860465825259055 )
J Clin Monit Comput - Peripheral tissue oximetry: comparing three commercial near-infrared spectroscopy oximeters on the forearm. ( 0,792025987433793 )
J. Med. Internet Res. - How accurate is web-based self-reported height, weight, and body mass index in young adults? ( 0,768391615224676 )
Comput. Aided Surg. - Non-invasive computer-assisted measurement of knee alignment. ( 0,748517132999239 )
AMIA Annu Symp Proc - ReadySteady: app for accelerometer-based activity monitoring and wellness-motivation feedback system for older adults. ( 0,748206490886334 )
J. Med. Internet Res. - Measures of physical activity using cell phones: validation using criterion methods. ( 0,737425920184128 )
J Telemed Telecare - Use of a mobile phone diary for observing weight management and related behaviours. ( 0,728940612064911 )
J. Med. Internet Res. - Validity of web-based self-reported weight and height: results of the Nutrinet-Sant? study. ( 0,711636118647385 )
J. Med. Internet Res. - Measuring physical activity in a cardiac rehabilitation population using a smartphone-based questionnaire. ( 0,685064699719264 )
J. Med. Internet Res. - Estimation of physical activity levels using cell phone questionnaires: a comparison with accelerometry for evaluation of between-subject and within-subject variations. ( 0,684914197612043 )
Health Info Libr J - Human information behaviour and physiological measurements as a basis to tailor health information. An explorative study in a physical activity intervention among prediabetic individuals in Northern Finland. ( 0,665171533631948 )
Int J Med Inform - Motivating and assisting physical exercise in independently living older adults: a pilot study. ( 0,659245040840824 )
Methods Inf Med - Measuring inter-observer agreement in contour delineation of medical imaging in a dummy run using Fleiss' kappa. ( 0,650050101176371 )
J. Med. Internet Res. - Using smartphone technology to monitor physical activity in the 10,000 Steps program: a matched case-control trial. ( 0,647589759690388 )
J. Med. Internet Res. - Recruitment via the Internet and social networking sites: the 1989-1995 cohort of the Australian Longitudinal Study on Women's Health. ( 0,646317951985595 )
J Clin Monit Comput - Comparison of ear and chest probes in transcutaneous carbon dioxide pressure measurements during general anesthesia in adults. ( 0,641002643222556 )
J Clin Monit Comput - Evaluation of the estimated continuous cardiac output monitoring system in adults and children undergoing kidney transplant surgery: a pilot study. ( 0,639693062795211 )
Int J Health Geogr - Correspondence between objective and perceived walking times to urban destinations: Influence of physical activity, neighbourhood walkability, and socio-demographics. ( 0,63915396431123 )
Res Synth Methods - Meta-analysis and the reversed Theorem of the Means. ( 0,635187263771012 )
J. Med. Internet Res. - Utilization patterns and user characteristics of an ad libitum Internet weight loss program. ( 0,633461767291693 )
J Med Syst - Barriers to physical activity: a study of self-revelation in an online community. ( 0,632960266975885 )
J Clin Monit Comput - Cardiac index measurements by transcutaneous Doppler ultrasound and transthoracic echocardiography in adult and pediatric emergency patients. ( 0,62972460372417 )
J. Med. Internet Res. - Validation of Web-based physical activity measurement systems using doubly labeled water. ( 0,628433900174755 )
J. Med. Internet Res. - An 8-week web-based weight loss challenge with celebrity endorsement and enhanced social support: observational study. ( 0,627954926092733 )
J Clin Monit Comput - Non-invasive measurement of cardiac output in obese children and adolescents: comparison of electrical cardiometry and transthoracic Doppler echocardiography. ( 0,617689758461716 )
Int J Health Geogr - Where they live, how they play: neighborhood greenness and outdoor physical activity among preschoolers. ( 0,616911428828987 )
J. Med. Internet Res. - Innovation in weight loss programs: a 3-dimensional virtual-world approach. ( 0,61413896486861 )
J Clin Monit Comput - Masseter muscle oxygen saturation is associated with central venous oxygen saturation in patients with severe sepsis. ( 0,613732289904889 )
J. Med. Internet Res. - Website usage and weight loss in a free commercial online weight loss program: retrospective cohort study. ( 0,612809382235471 )
J Clin Monit Comput - Validation of indirect calorimetry for measurement of energy expenditure in healthy volunteers undergoing pressure controlled non-invasive ventilation support. ( 0,611938437795288 )
J Telemed Telecare - Comparison of two motion sensors for use in cardiac telerehabilitation. ( 0,609284592515487 )
J. Med. Internet Res. - Web-based apps for reflection: a longitudinal study with hospital staff. ( 0,606591437005677 )
J. Med. Internet Res. - Factors related to sustained use of a free mobile app for dietary self-monitoring with photography and peer feedback: retrospective cohort study. ( 0,604172105547825 )
Comput. Biol. Med. - Blood glucose level reconstruction as a function of transcapillary glucose transport. ( 0,603660459128532 )
J. Med. Internet Res. - Dose-response effects of a Web-based physical activity program on body composition and metabolic health in inactive older adults: additional analyses of a randomized controlled trial. ( 0,602670856310924 )
J. Med. Internet Res. - Longitudinal accuracy of web-based self-reported weights: results from the Hopkins POWER Trial. ( 0,601706015127929 )
Comput Methods Programs Biomed - Appraisal of adaptive neuro-fuzzy computing technique for estimating anti-obesity properties of a medicinal plant. ( 0,591744517632514 )
J. Med. Internet Res. - Healthy weight regulation and eating disorder prevention in high school students: a universal and targeted Web-based intervention. ( 0,591091634944757 )
J. Med. Internet Res. - Mindless eating challenge: retention, weight outcomes, and barriers for changes in a public web-based healthy eating and weight loss program. ( 0,589859509105795 )
J. Med. Internet Res. - The change in eating behaviors in a Web-based weight loss program: a longitudinal analysis of study completers. ( 0,587067928791309 )
J Clin Monit Comput - Comparison of SNAP? II and BIS Vista indices during normothermic cardiopulmonary bypass under isoflurane anesthesia. ( 0,586354991021896 )
J Telemed Telecare - Evaluation of a mobile phone-based diet game for weight control. ( 0,58459686670587 )
J. Med. Internet Res. - Design of a website on nutrition and physical activity for adolescents: results from formative research. ( 0,584138894136326 )
J Clin Monit Comput - Usefulness of perfusion index to detect the effect of brachial plexus block. ( 0,580906422325397 )
Telemed J E Health - The accuracy of weight reported in a web-based obesity treatment program. ( 0,576828582944846 )
J Telemed Telecare - Longitudinal evaluation of balance quality using a modified bathroom scale: usability and acceptability. ( 0,575941783081382 )
Comput Math Methods Med - Arthritic hand-finger movement similarity measurements: tolerance near set approach. ( 0,574289171610773 )
J Telemed Telecare - Identification of determinants for weight reduction in overweight and obese children and adolescents. ( 0,570342121359205 )
J. Med. Internet Res. - Electronic word of mouth on twitter about physical activity in the United States: exploratory infodemiology study. ( 0,570246829900339 )
J. Med. Internet Res. - Exploring the relationship between changes in weight and utterances in an online weight loss forum: a content and correlational analysis study. ( 0,568697454334899 )
J. Med. Internet Res. - Tablet-based strength-balance training to motivate and improve adherence to exercise in independently living older people: a phase II preclinical exploratory trial. ( 0,567070330316083 )
Comput. Biol. Med. - Development and evaluation of an algorithm for computer analysis of maternal heart rate during labor. ( 0,565232767899115 )
J. Med. Internet Res. - The impact of an incentive on the use of an online self-directed wellness and self-management program. ( 0,562443363384089 )
J. Med. Internet Res. - Preventing the obesity epidemic by second generation tailored health communication: an interdisciplinary review. ( 0,561509560055416 )
J. Med. Internet Res. - Weight change in a commercial web-based weight loss program and its association with website use: cohort study. ( 0,560998104053276 )
Healthc (Amst) - Patient-centered financial incentives for health: Can employers get change for their dollars? ( 0,560397044214258 )
Comput. Biol. Med. - Gait variability and stability measures: minimum number of strides and within-session reliability. ( 0,558515923889392 )
J Clin Monit Comput - Cardiac parameters in children recovered from acute illness as measured by electrical cardiometry and comparisons to the literature. ( 0,558492485392901 )
J. Med. Internet Res. - Real-time social support through a mobile virtual community to improve healthy behavior in overweight and sedentary adults: a focus group analysis. ( 0,557638121386165 )
J. Med. Internet Res. - Effects of a web-based intervention on physical activity and metabolism in older adults: randomized controlled trial. ( 0,556034828910892 )
Med Decis Making - Evaluation of Physicians' Cognitive Styles. ( 0,553563833712774 )
J. Med. Internet Res. - Increasing physical activity with mobile devices: a meta-analysis. ( 0,553350615933383 )
Int J Comput Assist Radiol Surg - Influence of angulation on metacarpal bone mineral density measurements using digital X-ray radiogrammetry. ( 0,553075740719739 )
J. Med. Internet Res. - Designing for psychological change: individuals' reward and cost valuations in weight management. ( 0,55254381708448 )
Comput. Biol. Med. - Sensitivity of diabetic retinopathy associated vision loss to screening interval in an agent-based/discrete event simulation model. ( 0,552114550439358 )
J. Med. Internet Res. - Investigating predictors of visiting, using, and revisiting an online health-communication program: a longitudinal study. ( 0,551735962281106 )
J. Med. Internet Res. - Features predicting weight loss in overweight or obese participants in a web-based intervention: randomized trial. ( 0,547861904254842 )
J. Med. Internet Res. - Determinants of successful weight loss after using a commercial web-based weight reduction program for six months: cohort study. ( 0,547640238860161 )
J. Med. Internet Res. - Silence is golden: effect of encouragement in motivating the weak link in an online exercise video game. ( 0,546793578139201 )
J. Med. Internet Res. - Behavior change techniques implemented in electronic lifestyle activity monitors: a systematic content analysis. ( 0,546404753116134 )
J Telemed Telecare - A pilot study of a tool to stimulate physical activity in patients with COPD or type 2 diabetes in primary care. ( 0,545753864489585 )
J. Med. Internet Res. - Automated indexing of Internet stories for health behavior change: weight loss attitude pilot study. ( 0,541134013267861 )
Comput Methods Programs Biomed - Comparison of checking behavior in adults with or without checking symptom of obsessive-compulsive disorder using a novel computer-based measure. ( 0,540060629055129 )
Int J Health Geogr - Generating GPS activity spaces that shed light upon the mobility habits of older adults: a descriptive analysis. ( 0,539370596341299 )
Int J Health Geogr - People living in hilly residential areas in metropolitan Perth have less diabetes: spurious association or important environmental determinant? ( 0,536030920063666 )
J Clin Monit Comput - Validation of continuous and noninvasive hemoglobin monitoring by pulse CO-oximetry in Japanese surgical patients. ( 0,535240285156063 )
Med Biol Eng Comput - Intra-protocol repeatability and inter-protocol agreement for the analysis of scapulo-humeral coordination. ( 0,531827182256505 )
J. Med. Internet Res. - A 12-week commercial web-based weight-loss program for overweight and obese adults: randomized controlled trial comparing basic versus enhanced features. ( 0,5303641514531 )
J Med Syst - Automatic quantification of spinal curvature in scoliotic radiograph using image processing. ( 0,529331820036827 )
Res Synth Methods - Practicalities of using a modified version of the Cochrane Collaboration risk of bias tool for randomised and non-randomised study designs applied in a health technology assessment setting. ( 0,528699859215113 )
Int J Health Geogr - How well do modelled routes to school record the environments children are exposed to? A cross-sectional comparison of GIS-modelled and GPS-measured routes to school. ( 0,526929506761022 )
J Clin Monit Comput - Comparing hemodynamic effects with three different measurement devices, of two methods of external leg compression versus passive leg raising in patients after cardiac surgery. ( 0,526603855291978 )
Comput Math Methods Med - Long-term prediction of emergency department revenue and visitor volume using autoregressive integrated moving average model. ( 0,525276197834638 )
Med Decis Making - Standard error of measurement of 5 health utility indexes across the range of health for use in estimating reliability and responsiveness. ( 0,524888997667732 )
J. Med. Internet Res. - Multimodal guided self-help exercise program to prevent speech, swallowing, and shoulder problems among head and neck cancer patients: a feasibility study. ( 0,52259661650858 )
AMIA Annu Symp Proc - Studying visual behaviors from multiple eye tracking features across levels of information representation. ( 0,521553050543382 )
Res Synth Methods - Inaccuracy of regression results in replacing bivariate correlations. ( 0,521417041006838 )
J Chem Inf Model - Quantifying the fingerprint descriptor dependence of structure-activity relationship information on a large scale. ( 0,51807746073261 )
Comput. Biol. Med. - The dominant morphology of fractionated atrial electrograms has greater temporal stability in persistent as compared with paroxysmal atrial fibrillation. ( 0,517903098446723 )
Comput. Aided Surg. - Non-invasive quantification of lower limb mechanical alignment in flexion. ( 0,515218526382705 )
Med Decis Making - Predicting the EuroQol Group's EQ-5D index from CDC's Healthy Days in a US sample. ( 0,51493212243308 )
Comput Methods Programs Biomed - Multifractal characterisation of electrocardiographic RR and QT time-series before and after progressive exercise. ( 0,513280856517815 )
J. Med. Internet Res. - Associations of internet website use with weight change in a long-term weight loss maintenance program. ( 0,513240054182155 )
Telemed J E Health - Telemedicine and face-to-face care for pediatric obesity. ( 0,512538500397936 )
J Clin Monit Comput - Heart rate variability indices for very short-term (30 beat) analysis. Part 2: validation. ( 0,511356440236491 )
Med Biol Eng Comput - Fluctuation analysis of respiratory impedance waveform in asthmatic patients: effect of airway obstruction. ( 0,511240934914743 )
Med Biol Eng Comput - Quantitative geometric analysis of rib, costal cartilage and sternum from childhood to teenagehood. ( 0,509741438259523 )
J. Med. Internet Res. - Improvement of Physical Activity by a Kiosk-based Electronic Screening and Brief Intervention in Routine Primary Health Care: Patient-Initiated Versus Staff-Referred. ( 0,507263470285567 )
J Clin Monit Comput - Improvements in the application and reporting of advanced Bland-Altman methods of comparison. ( 0,506527525376214 )
Comput Math Methods Med - Transcriptional protein-protein cooperativity in POU/HMG/DNA complexes revealed by normal mode analysis. ( 0,50576506770679 )