scholarly journals Validity of a Non-Proprietary Algorithm for Identifying Lying Down Using Raw Data from Thigh-Worn Triaxial Accelerometers

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 904
Author(s):  
Pasan Hettiarachchi ◽  
Katarina Aili ◽  
Andreas Holtermann ◽  
Emmanuel Stamatakis ◽  
Magnus Svartengren ◽  
...  
Keyword(s):  
Standard Deviation ◽  
Sedentary Time ◽  
Daily Life ◽  
Validation Dataset ◽  
Time Duration ◽  
Raw Data ◽  
The Mean ◽  
Sedentary Bouts ◽  
Lying Down ◽  
Duration Criterion

Body postural allocation during daily life is important for health, and can be assessed with thigh-worn accelerometers. An algorithm based on sedentary bouts from the proprietary ActivePAL software can detect lying down from a single thigh-worn accelerometer using rotations of the thigh. However, it is not usable across brands of accelerometers. This algorithm has the potential to be refined. Aim: To refine and assess the validity of an algorithm to detect lying down from raw data of thigh-worn accelerometers. Axivity-AX3 accelerometers were placed on the thigh and upper back (reference) on adults in a development dataset (n = 50) and a validation dataset (n = 47) for 7 days. Sedentary time from the open Acti4-algorithm was used as input to the algorithm. In addition to the thigh-rotation criterion in the existing algorithm, two criteria based on standard deviation of acceleration and a time duration criterion of sedentary bouts were added. The mean difference (95% agreement-limits) between the total identified lying time/day, between the refined algorithm and the reference was +2.9 (−135,141) min in the development dataset and +6.5 (−145,159) min in the validation dataset. The refined algorithm can be used to estimate lying time in studies using different accelerometer brands.

scholarly journals A Rapid Motor Task-Based Screening Tool for Parkinsonism in Community-Based Studies

2021 ◽  
Vol 12 ◽  
Author(s):  
Wendy W. Dlamini ◽  
Searles Nielsen ◽  
Mwiza Ushe ◽  
Gill Nelson ◽  
Brad A. Racette
Keyword(s):  
Standard Deviation ◽  
Predictive Model ◽  
Screening Tool ◽  
Motor Task ◽  
Population Based ◽  
Validation Dataset ◽  
Motor Tasks ◽  
Test Dataset ◽  
The Mean ◽  
Summary Measures

Background: The prevalence of parkinsonism in developing countries is largely unknown due to difficulty in ascertainment because access to neurologists is often limited.Objective: Develop and validate a parkinsonism screening tool using objective motor task-based tests that can be administered by non-clinicians.Methods: In a cross-sectional population-based sample from South Africa, we evaluated 315 adults, age >40, from an Mn-exposed (smelter) community, using the Unified Parkinson Disease Rating Scale motor subsection 3 (UPDRS3), Purdue grooved pegboard, and kinematic-UPDRS3-based motor tasks. In 275 participants (training dataset), we constructed a linear regression model to predict UPDRS3. We selected motor task summary measures independently associated with UPDRS3 (p < 0.05). We validated the model internally in the remaining 40 participants from the manganese-exposed community (test dataset) using the area under the receiver operating characteristic curve (AUC), and externally in another population-based sample of 90 participants from another South African community with only background levels of environmental Mn exposure.Results: The mean UPDRS3 score in participants from the Mn-exposed community was 9.1 in both the training and test datasets (standard deviation = 6.4 and 6.1, respectively). Together, 57 (18.1%) participants in this community had a UPDRS3 ≥ 15, including three with Parkinson's disease. In the non-exposed community, the mean UPDRS3 was 3.9 (standard deviation = 4.3). Three (3.3%) had a UPDRS3 ≥ 15. Grooved pegboard time and mean velocity for hand rotation and finger tapping tasks were strongly associated with UPDRS3. Using these motor task summary measures and age, the UPDRS3 predictive model performed very well. In the test dataset, AUCs were 0.81 (95% CI 0.68, 0.94) and 0.91 (95% CI 0.81, 1.00) for cut points for neurologist-assessed UPDRS3 ≥ 10 and UPDRS3 ≥ 15, respectively. In the external validation dataset, the AUC was 0.85 (95% CI 0.73, 0.97) for UPDRS3 ≥ 10. AUCs were 0.76–0.82 when excluding age.Conclusion: A predictive model based on a series of objective motor tasks performs very well in assessing severity of parkinsonism in both Mn-exposed and non-exposed population-based cohorts.

scholarly journals Education on the Fulfillment of Balanced Nutrition and My Plate Contents for Students of SMPN 7 Kendari

2021 ◽  
Vol 1 (1) ◽  
pp. 40-43
Author(s):  
Lisnawaty ◽  
Rizki Eka Sakti Octaviani ◽  
Yusuf Sabilu
Keyword(s):  
Standard Deviation ◽  
Daily Life ◽  
Statistical Tests ◽  
Female Students ◽  
Male Students ◽  
Service Program ◽  
Questions And Answers ◽  
The Mean ◽  
Nutrition Messages ◽  
Average Sample

To achieve optimal nutritional status, a country needs guidelines for balanced nutrition. One of the visualizations of balanced nutrition messages is 'My Dinner Plate' which shows the serving of food and drinks at each meal. The purpose of this service program is to provide information and knowledge about the fulfillment of balanced nutrition and the contents of my plate to adolescents, especially students of SMPN 7 Kendari. The target of this program is students of SMPN 7 Kendari, especially those in Class VII. This program consists of counseling through power points and videos on general guidelines for balanced nutrition and the contents of my plate, discussions and questions and answers, and distributing pre-post questionnaires. The results of this activity were as many as 44 students as respondents consisting of 31.8% male students and 68.2% female students. The mean knowledge of the sample before the extension was 4.50 with a standard deviation of 1.535. Meanwhile, after counseling, the average sample knowledge increased to 7.64 with a standard deviation of 1.293. The results of statistical tests showed that the value of p = 0.000 where the value of p = <0.05, it can be concluded that there is an effect of counseling on the fulfillment of balanced nutrition and the contents of my plate. There needs to be further counseling and mentoring activities so that the knowledge gained can be applied in daily life.

Cardiac Deceleration and Accuracy of Performance: Recalculation of Standard Score Transform

1979 ◽  
Vol 49 (1) ◽  
pp. 297-298
Author(s):  
Nicholas John Carriero
Keyword(s):  
Standard Deviation ◽  
Standard Score ◽  
Raw Data ◽  
Cardiac Deceleration ◽  
The Mean ◽  
Standard Deviations

In two previous studies the standard score transform used was based on a standard deviation derived from the mean standard deviations of the raw data in the six classifications employed in the studies rather than on one based on the entire set of raw scores as is the more common practice. The data were reanalyzed using the latter basis and major findings were confirmed. Some of the minor findings, however, were changed. These changes are pointed out and discussed where they occurred.

scholarly journals Sedentary Behaviour and Physical Activity of People with Stroke in Rehabilitation Hospitals

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Anna Sjöholm ◽  
Monica Skarin ◽  
Leonid Churilov ◽  
Michael Nilsson ◽  
Julie Bernhardt ◽  
...  
Keyword(s):  
Physical Activity ◽  
Sedentary Behaviour ◽  
Stroke Rehabilitation ◽  
Sedentary Time ◽  
Stroke Survivors ◽  
Physically Active ◽  
Sedentary Bouts ◽  
Rehabilitation Hospitals ◽  
Lying Down ◽  
Sedentary Activities

Background. Sedentary behaviour is associated with health risks, independent of physical activity. This study aimed to investigate patterns of sedentary behaviour and physical activity among stroke survivors in rehabilitation hospitals.Methods. Stroke survivors admitted to four Swedish hospital-based rehabilitation units were recruited ≥7 days since stroke onset and their activity was measured using behavioural mapping. Sedentary behaviour was defined as lying down or sitting supported.Results. 104 patients were observed (53% men). Participants spent an average of 74% (standard deviation, SD 21%) of the observed day in sedentary activities. Continuous sedentary bouts of ≥1 hour represented 44% (SD 32%) of the observed day. A higher proportion (30%, SD 7%) of participants were physically active between 9:00 AM and 12:30 PM, compared to the rest of the observed day (23%, SD 6%,P<0.0005). Patients had higher odds of being physically active in the hall (odds ratio, OR 1.7,P=0.001) than in the therapy area.Conclusions. The time stroke survivors spend in stroke rehabilitation units may not be used in the most efficient way to promote maximal recovery. Interventions to promote reduced sedentary time could help improve outcome and these should be tested in clinical trials.

scholarly journals Are Older Adults without a Healthy Diet Less Physically Active and More Sedentary?

Nutrients ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 1119 ◽  
Author(s):  
Ming-Chun Hsueh ◽  
Ru Rutherford ◽  
Yi-Hsuan Huang ◽  
Hung-Yu Chang Chien ◽  
Chia-Hui Chang ◽  
...  
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Sedentary Behavior ◽  
Sedentary Time ◽  
Healthy Diet ◽  
Sitting Time ◽  
Time Duration ◽  
Sedentary Breaks ◽  
Sedentary Bouts ◽  
Objectively Measured

Few studies on older populations consider several energy balance-related behaviors together. This cross-sectional study compared subjectively and objectively measured physical activity (PA) and sedentary behavior (SB) patterns between older adults with and without a healthy diet. We recruited 127 community-dwelling older Taiwanese adults (69.9 ± 5.0 years); data were collected during April and September 2018. Objectively measured total PA, moderate-to-vigorous PA, light PA, step count, total sedentary time, duration of sedentary bouts, number of sedentary bouts, and number of sedentary breaks were assessed using activity monitors. Subjectively measured PA and SB were measured using the International Physical Activity Questionnaire and Sedentary Behavior Questionnaire for Older Adults. Chi-square tests and independent sample t-tests were performed. For subjective measures, older adults without a healthy diet spent significantly less total leisure time on PA and more leisure sitting time than those with a healthy diet. For objective measures, older adults without a healthy diet spent less time on light PA and had a higher total sedentary time, duration of sedentary bouts, times of sedentary bouts, and times of sedentary breaks than those with a healthy diet. Regardless of the use of objective or subjective measurements, older adults without a healthy diet engaged in a more inactive and sedentary lifestyle. These findings have implications for health promotion practitioners in designing tailored interventions.

At Least One Standard Deviation Above the Mean

1969 ◽  
Vol 14 (9) ◽  
pp. 470-471
Author(s):  
M. DAVID MERRILL
Keyword(s):  
Standard Deviation ◽  
The Mean

The Estimation of Blood Platelet Survival

1972 ◽  
Vol 28 (03) ◽  
pp. 447-456 ◽  
Author(s):  
E. A Murphy ◽  
M. E Francis ◽  
J. F Mustard
Keyword(s):  
Standard Deviation ◽  
Least Squares ◽  
Experimental Error ◽  
Blood Platelet ◽  
Least Squares Estimation ◽  
Systematic Relationship ◽  
Platelet Survival ◽  
The Mean ◽  
Normally Distributed

SummaryThe characteristics of experimental error in measurement of platelet radioactivity have been explored by blind replicate determinations on specimens taken on several days on each of three Walker hounds.Analysis suggests that it is not unreasonable to suppose that error for each sample is normally distributed ; and while there is evidence that the variance is heterogeneous, no systematic relationship has been discovered between the mean and the standard deviation of the determinations on individual samples. Thus, since it would be impracticable for investigators to do replicate determinations as a routine, no improvement over simple unweighted least squares estimation on untransformed data suggests itself.

PENGARUH PENDIDIKAN KESEHATAN REPRODUKSI PADA PEER GROUP (TEMAN SEBAYA) TERHADAP PENGETAHUAN DAN PERSEPSI REMAJA TENTANG PENDEWASAAN USIA PERKAWINAN DI SMA NEGERI 1 KECAMATAN NAMORAMBE KAB. DELI SERDANG 2018

2020 ◽  
Vol 1 (2) ◽  
pp. 56-66
Author(s):  
Irma Linda
Keyword(s):  
Standard Deviation ◽  
Health Education ◽  
Reproductive Health ◽  
Peer Group ◽  
Peer Groups ◽  
A Value ◽  
Significant Difference ◽  
Reproductive Health Education ◽  
The Mean ◽  
Adolescent Perceptions

Background: Early marriages are at high risk of marital failure, poor family quality, young pregnancies at risk of maternal death, and the risk of being mentally ill to foster marriage and be responsible parents. Objective: To determine the effect of reproductive health education on peer groups (peers) on the knowledge and perceptions of adolescents about marriage age maturity. Method: This research uses the Quasi experimental method with One group pre and post test design, conducted from May to September 2018. The statistical analysis used in this study is a paired T test with a confidence level of 95% (α = 0, 05). Results: There is an average difference in the mean value of adolescent knowledge between the first and second measurements is 0.50 with a standard deviation of 1.922. The mean difference in mean scores of adolescent perceptions between the first and second measurements was 4.42 with a standard deviation of 9.611. Conclusion: There is a significant difference between adolescent knowledge on the pretest and posttest measurements with a value of P = 0.002, and there is a significant difference between adolescent perceptions on the pretest and posttest measurements with a value of p = 0.001. Increasing the number of facilities and facilities related to reproductive health education by peer groups (peers) in adolescents is carried out on an ongoing basis at school, in collaboration with local health workers as prevention of risky pregnancy.

Regularity and latency of units in ventral cochlear nucleus: implications for unit classification and generation of response properties

1988 ◽  
Vol 60 (1) ◽  
pp. 1-29 ◽  
Author(s):  
E. D. Young ◽  
J. M. Robert ◽  
W. P. Shofner
Keyword(s):  
Standard Deviation ◽  
Cochlear Nucleus ◽  
Interspike Interval ◽  
Rate Adaptation ◽  
Stellate Cells ◽  
Instantaneous Rate ◽  
Ventral Cochlear Nucleus ◽  
Bushy Cell ◽  
Low Pass ◽  
The Mean

1. The responses of neurons in the ventral cochlear nucleus (VCN) of decerebrate cats are described with regard to their regularity of discharge and latency. Regularity is measured by estimating the mean and standard deviation of interspike intervals as a function of time during responses to short tone bursts (25 ms). This method extends the usual interspike-interval analysis based on interval histograms by allowing the study of temporal changes in regularity during transient responses. The coefficient of variation (CV), equal to the ratio of standard deviation to mean interspike interval, is used as a measure of irregularity. Latency is measured as the mean and standard deviation of the latency of the first spike in response to short tone bursts, with 1.6-ms rise times. 2. The regularity and latency properties of the usual PST histogram response types are shown. Five major PST response type classes are used: chopper, primary-like, onset, onset-C, and unusual. The presence of a prepotential in a unit's action potentials is also noted; a prepotential implies that the unit is recorded from a bushy cell. 3. Units with chopper PST histograms give the most regular discharge. Three varieties of choppers are found. Chop-S units (regular choppers) have CVs less than 0.35 that are approximately constant during the response; chop-S units show no adaptation of instantaneous rate, as measured by the inverse of the mean interspike interval. Chop-T units have CVs greater than 0.35, show an increase in irregularity during the response and show substantial rate adaptation. Chop-U units have CVs greater than 0.35, show a decrease in irregularity during the response, and show a variety of rate adaptation behaviors, including negative adaptation (an increase in rate during a short-tone response). Irregular choppers (chop-T and chop-U units) rarely have CVs greater than 0.5. Choppers have the longest latencies of VCN units; all three groups have mean latencies at least 1 ms longer than the shortest auditory nerve (AN) fiber mean latencies. 4. Chopper units are recorded from stellate cells in VCN (35, 42). Our results for chopper units suggest a model for stellate cells in which a regularly firing action potential generator is driven by the summation of the AN inputs to the cell, where the summation is low-pass filtered by the membrane capacitance of the cell.(ABSTRACT TRUNCATED AT 400 WORDS)

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