Accelerometer
Dotaz
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Akcelerometr TriTrac-R3D je určen pro monitorování pohybové aktivity (většinou lokomočního charakteru) v prostoru. Cílem práce bylo zjistit, zda je TriTrac-R3D schopen monitorovat pohybovou aktivitu bez lokomočního charakteru a zda dokáže zaznamenat rozdíly ve výchylkách na stabilní a nestabilní plošině. Testovaný soubor tvořilo 47 probandů, kterým byl připevněn TriTrac-R3D na pravou SIAS (spina illiaca anterior superior). Probandi absolvovali chůzi na stabilní a nestabilní plošině. Byly porovnávány rozdíly mezi muži a ženami a sportovci a nesportovci. Výsledky měření ukázaly, že přístroj je schopen zaznamenat výchylky těla při chůzi na místě i rozdíly mezi plošinami. Na nestabilní plošině byly větší výchylky SIAS než na stabilní plošině, mezi muži a ženami nebyl ve výchylkách těžiště rozdíl, nesportovci vykazovali na stabilní plošině menší výchylky než sportovci, na nestabilní plošině mezi nimi nebyl rozdíl.
Accelerometer TriTrac–R3D is used in monitoring of the kinetic activity (mostly locomotion) in space. The objective of this study was to determine if TriTrac can monitor kinetic activity without locomotion and if it monitors deflections on a stable and on an unstable platform. The study group contained forty-seven individuals; each of them had Tritrac – R3D attached to the right (SIAS) spina illiaca anterior superior.Tested individuals completed gait on stable and unstable platform.The study group compared males and females, sports people, and individuals not involved in sports.The results show that the device can record body deflections during gait and differences between platforms. On the unstable platform, the deflections of SIAS were greater than on the stable platform. No significant difference of the center of gravity deflection was noted between males and females. Individuals not involved in sports presented with smaller deflections on the stable platformthan did sportsindividuals. No difference was noted on the stable platform between these individuals.
Poškození mozku představuje v současné době významný problém nejenom pro jeho stoupající četnost, ale především pro svou závažnost. Léčba je finančně velmi náročná, zejména u mozkových traumat postihujících převážně mladší věkové skupiny v produktivním věku. Incidence traumatického poškození mozku je v evropských průmyslových zemích vysoká, přibližně 250 - 300 postižených na 100 000 obyvatel (17). Podle dat z roku 2010 z Ústavu zdravotnické informatiky a statistiky České republiky je nově přijato do nemocnice 48 000 pacientů ročně s diagnózou cévní mozková příhoda. V České republice neexistují specializovaná neurorehabilitační pracoviště, která by zajišťovala včasnou intenzivní a interprofesní rehabilitaci pacientů po poškození mozku. U těchto pacientů se setkáváme s celým komplexem obtíží: motorických, kognitivních, fatických, smyslových a psychických. Klíčové je provádět funkční diagnostiku a poté objektivní posouzení efektu celé rehabilitační intervence, a také míru spolupráce a motivace pacientů při individuální neurorehabilitaci. Většina diagnosticko-terapeutických přístrojových metod je pro běžnou rehabilitační klinickou praxi buď obtížně nebo zcela nedostupná z důvodů ekonomických nebo z důvodu technologické náročnosti. Použití senzoru – akcelerometru ve formě náramků se jeví jako výhodná možnost i u pacientů s vyšším stupněm funkčního postižení (disability) (10). Za účasti 1. LF UK a VFN v Praze, Všeobecné zdravotní pojišťovny a firmy Princip vznikl projekt na využití akcelerometru – náramku pro monitoring pohybu horních končetin u pacientů po poškození mozku.
Brain damage presently represents a significant problem not only for increasing frequency, but especially for the depth of the situation. The therapy is very costly particularly in brain trauma affecting predominantly younger age groups at the productive age. Incidence of brain injury in the European industrial countries is high reaching approximately 250 to 300 individuals per 100.000 individuals in population (17). According to data for 2010 issue by the Institute of Medical Information and Statistic of the Czech Republic, 48.000 patients with the diagnosis of vascular brain event are admitted to hospitals annually. There are no specialized neurorehabilitation workplaces in the Czech Republic, which would provide timely intensive and inter-professional rehabilitation of patients with brain injury. In these patients we encounter a whole complex of troubles: motor, cognitive, fatigue, sensual and psychic. Functional diagnostics and objective evaluation of the effect of the complex rehabilitation intervention are crucial as well as the extent of collaboration and motivation of the patients in individual rehabilitation. Most diagnostic-therapeutic instrumental methods are unobtainable or difficult to obtain in common rehabilitation practice for economic reasons or technical demands. The use of a sensor – accelerometer in the form of a bracelet appears to be a suitable possibility even in patients with a high degree of functional damage (disability) (10). The project for application of accelerometer – a bracelet for monitoring of the locomotion of upper extremities in patients after brain damage originated with the participation of the First Medical Faculty and General Teaching Hospital in Prague, General Medical Insurance Company and the firm Princip.
There is no general consensus regarding which accelerometer cut-off point (CoP) is most acceptable to estimate the time spent in moderate-to-vigorous physical activity (MVPA) in children and choice of an appropriate CoP primarily remains a subjective decision. Therefore, this study aimed to analyze the influence of CoP selection on the mean MVPA and to define the optimal thresholds of MVPA derived from different accelerometer CoPs to avoid overweight/obesity and adiposity in children aged 7 to 12 years. Three hundred six children participated. Physical activity (PA) was monitored for seven consecutive days using an ActiGraph accelerometer (model GT3X) and the intensity of PA was estimated using the five most frequently published CoPs. Body adiposity was assessed using a multi-frequency bioelectrical impedance analysis. There was found a wide range of mean levels of MVPA that ranged from 27 (Puyau CoP) to 231 min∙d-1 (Freedson 2005 CoP). A receiver operating characteristic curve analysis indicated that the optimal thresholds for counts per minute (cpm) and MVPA derived from the Puyau CoP was the most useful in classifying children according to their body mass index (BMI) and fat mass percentage (FM%). In the total sample, the optimal thresholds of the MVPA derived from the Puyau CoP were 22 and 23 min∙d-1 when the categories based on BMI and FM%, respectively, were used. The children who did not meet these optimal thresholds had a significantly increased risk of being overweight/obese (OR = 2.88, P < 0.01) and risk of having excess fat mass (OR = 2.41, P < 0.01). In conclusion, the decision of selecting among various CoPs significantly influences the optimal levels of MVPA. The Puyau CoP of 3 200 cmp seems to be the most useful for defining the optimal level of PA for pediatric obesity prevention.
- MeSH
- adipozita MeSH
- akcelerometrie MeSH
- cvičení * MeSH
- dítě MeSH
- index tělesné hmotnosti MeSH
- lidé MeSH
- obezita dětí a dospívajících prevence a kontrola MeSH
- odds ratio MeSH
- plocha pod křivkou MeSH
- ROC křivka MeSH
- Check Tag
- dítě MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
Techniques to quantify postural stability usually rely on the evaluation of only two variables, that is, two coordinates of COP. However, by using three variables, that is, three components of acceleration vector, it is possible to describe human movement more precisely. For this purpose, a single three-axis accelerometer was used, making it possible to evaluate 3D movement by use of a novel method, convex polyhedron (CP), together with a traditional method, based on area of the confidence ellipse (ACE). Ten patients (Pts) with cerebellar ataxia and eleven healthy individuals of control group (CG) participated in the study. The results show a significant increase of volume of the CP (CPV) in Pts or CG standing on foam surface with eyes open (EO) and eyes closed (EC) after the EC phase. Significant difference between Pts and CG was found in all cases as well. Correlation coefficient indicates strong correlation between the CPV and ACE in most cases of patient examinations, thus confirming the possibility of quantification of postural instability by the introduced method of CPV.
- MeSH
- akcelerometrie metody MeSH
- dospělí MeSH
- lidé MeSH
- postura těla fyziologie MeSH
- posturální rovnováha fyziologie MeSH
- Check Tag
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
BACKGROUND: Micra is a leadless pacemaker that is implanted in the right ventricle and provides rate response via a 3-axis accelerometer (ACC). Custom software was developed to detect atrial contraction using the ACC enabling atrioventricular (AV) synchronous pacing. OBJECTIVE: The purpose of this study was to sense atrial contractions from the Micra ACC signal and provide AV synchronous pacing. METHODS: The Micra Accelerometer Sensor Sub-Study (MASS) and MASS2 early feasibility studies showed intracardiac accelerations related to atrial contraction can be measured via ACC in the Micra leadless pacemaker. The Micra Atrial TRacking Using A Ventricular AccELerometer (MARVEL) study was a prospective multicenter study designed to characterize the closed-loop performance of an AV synchronous algorithm downloaded into previously implanted Micra devices. Atrioventricular synchrony (AVS) was measured during 30 minutes of rest and during VVI pacing. AVS was defined as a P wave visible on surface ECG followed by a ventricular event <300 ms. RESULTS: A total of 64 patients completed the MARVEL study procedure at 12 centers in 9 countries. Patients were implanted with a Micra for a median of 6.0 months (range 0-41.4). High-degree AV block was present in 33 patients, whereas 31 had predominantly intrinsic conduction during the study. Average AVS during AV algorithm pacing was 87.0% (95% confidence interval 81.8%-90.9%), 80.0% in high-degree block patients and 94.4% in patients with intrinsic conduction. AVS was significantly greater (P <.001) during AV algorithm pacing compared to VVI in high-degree block patients, whereas AVS was maintained in patients with intrinsic conduction. CONCLUSION: Accelerometer-based atrial sensing is feasible and significantly improves AVS in patients with AV block and a single-chamber leadless pacemaker implanted in the right ventricle.
- MeSH
- akcelerometrie přístrojové vybavení MeSH
- atrioventrikulární blokáda patofyziologie terapie MeSH
- design vybavení MeSH
- dospělí MeSH
- elektrokardiografie metody MeSH
- kardiostimulátor * MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- následné studie MeSH
- prospektivní studie MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- srdeční frekvence fyziologie MeSH
- srdeční komory patofyziologie MeSH
- srdeční síně patofyziologie MeSH
- studie proveditelnosti MeSH
- Check Tag
- dospělí MeSH
- lidé středního věku MeSH
- lidé MeSH
- mladý dospělý MeSH
- mužské pohlaví MeSH
- senioři nad 80 let MeSH
- senioři MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- multicentrická studie MeSH
- práce podpořená grantem MeSH
Parent-child patterns in objectively measured movement behaviours were the highlight of this study. A total of 381 families (337 mothers, 256 fathers, 190 daughters, and 191 sons) from 36 randomly selected schools and kindergartens provided valid accelerometer data. Sedentary behaviour and physical activity (PA) were assessed using ActiGraph accelerometers. Spearman's rho was used to evaluate parent-child associations, while logistic regression analysis (the backward LR method) was used to recognize factors related to children's achievement of PA recommendations. Results indicated that girls engaged more in light PA, while boys showed higher levels of moderate and vigorous PA. Mothers spent less time sitting and more time in light PA compared to fathers, resulting in higher total PA levels. Father-son pairs showed a stronger association in total PA than mother-son pairs. Children aged 6-10 years and those with mothers who engaged in more vigorous PA were more likely to meet PA recommendations compared to younger children and those with less active mothers.
- Publikační typ
- časopisecké články MeSH
BACKGROUND: Despite the availability of physical activity (PA) interventions, many older adults are still not active enough. This might be partially explained by the often-limited effects of PA interventions. In general, health behavior change interventions often do not focus on contextual and time-varying determinants, which may limit their effectiveness. However, before the dynamic tailoring of interventions can be developed, one should know which time-dependent determinants are associated with PA and how strong these associations are. OBJECTIVE: The aim of this study was to examine within-person associations between multiple determinants of the capability, opportunity, motivation, and behavior framework assessed using Ecological Momentary Assessment (EMA) and accelerometer-assessed light PA, moderate to vigorous PA, and total PA performed at 15, 30, 60, and 120 minutes after the EMA trigger. METHODS: Observational data were collected from 64 healthy older adults (36/64, 56% men; mean age 72.1, SD 5.6 y). Participants were asked to answer a time-based EMA questionnaire 6 times per day that assessed emotions (ie, relaxation, satisfaction, irritation, and feeling down), the physical complaint fatigue, intention, intention, and self-efficacy. An Axivity AX3 was wrist worn to capture the participants' PA. Multilevel regression analyses in R were performed to examine these within-person associations. RESULTS: Irritation, feeling down, intention, and self-efficacy were positively associated with subsequent light PA or moderate to vigorous PA at 15, 30, 60, or 120 minutes after the trigger, whereas relaxation, satisfaction, and fatigue were negatively associated. CONCLUSIONS: Multiple associations were observed in this study. This knowledge in combination with the time dependency of the determinants is valuable information for future interventions so that suggestions to be active can be provided when the older adult is most receptive.
- Publikační typ
- časopisecké články MeSH
Assessing parent-child relationship in sleep behaviours is important for facilitating changes in the sleep guideline compliance in preschool age children. The aim of this study was to examine accelerometer-measured sleep quantity and quality in families with children aged 3-8 years and investigate the parents' influence on the child's sleep. The data were obtained from the Czech cross-sectional FAMIly Physical Activity, Sedentary behaviour and Sleep (FAMIPASS) study, with a final sample of 374 families. Families were recruited through the enrolment of their children in kindergartens/primary schools between March 2022 and May 2023. The sleep time window and total sleep time were assessed using a wrist-worn ActiGraph accelerometer. Participants wore this device continuously for 24 h/day over a period of 7 consecutive days. Demographic data and potential correlates were obtained via questionnaires completed by parents. Statistical analyses were completed using logistic regression and independent-samples Mann-Whitney U test. In all, 65.5% of children (60% boys, 70.9% girls) and 58.3% of parents (52.4% fathers, 64.3% mothers) achieved the recommended sleep duration. Greater sleep quantity and duration in good-quality sleep were significantly higher in girls/mothers, compared to boys/fathers. Preschoolers were more likely to comply with sleep guidelines if their mother (but not father) met the sleep recommendation and their mothers did not have a higher education level. Adhering to sleep guidelines in children was also associated with children's female gender, absence of screen device in the bedroom, and being more active. Given the high concurrence in mother-child sleep quantity, it is important to promote healthy sleep behaviours in the whole family.
- MeSH
- akcelerometrie * přístrojové vybavení MeSH
- cvičení * MeSH
- dítě MeSH
- dodržování směrnic * statistika a číselné údaje MeSH
- dospělí MeSH
- kvalita spánku MeSH
- lidé MeSH
- předškolní dítě MeSH
- průřezové studie MeSH
- průzkumy a dotazníky MeSH
- rodiče MeSH
- sedavý životní styl * MeSH
- spánek * fyziologie MeSH
- vztahy mezi rodiči a dětmi * MeSH
- Check Tag
- dítě MeSH
- dospělí MeSH
- lidé MeSH
- mužské pohlaví MeSH
- předškolní dítě MeSH
- ženské pohlaví MeSH
- Publikační typ
- časopisecké články MeSH
- Geografické názvy
- Česká republika MeSH
