scholarly journals Validation of a smartphone embedded inertial measurement unit for measuring postural stability in older adults

2020 ◽  
Author(s):  
Friedl De Groote ◽  
Stefanie Vandevyvere ◽  
Florian Vanhevel ◽  
Jean-Jacques Orban de Xivry
Keyword(s):  
Older Adults ◽  
Postural Stability ◽  
Force Plate ◽  
Correlation Coefficients ◽  
Mean Square ◽  
Intra Class Correlation ◽  
Inertial Measurement ◽  
Large Sample ◽  
Absolute Value ◽  
Test Retest Reliability

AbstractBackgroundIdentifying older adults with increased fall risk due to poor postural control on a large scale is only possible through omnipresent and low cost measuring devices such as the inertial measurement units (IMU) embedded in smartphones. However, the correlation between smartphone measures of postural stability and state-of-the-art force plate measures has never been assessed in a large sample allowing us to take into account age as a covariate.Research questionHow reliably can postural stability be measured with a smartphone embedded IMU in comparison to a force plate?MethodsWe assessed balance in 97 adults aged 50 to 90 years in four different conditions (eyes open, eyes closed, semi-tandem and dual-task) in the anterio-posterior and medio-lateral directions. We used six different parameters (root mean square and average absolute value of COP displacement, velocity and acceleration) for the force plate and two different parameters (root mean square and average absolute value of COM acceleration) for the smartphone.ResultsTest-retest reliability was smaller for the smartphone than for the force plate (intra class correlation) but both devices could equally well detect differences between conditions (similar Cohen’s d). Parameters from the smartphone and the force plate, with age regressed out, were moderately correlated (robust correlation coefficients of around 0.5).SignificanceThis study comprehensively documents test-retest reliability and effect sizes for stability measures obtained with a force plate and smartphone as well as correlations between force plate and smartphone measures based on a large sample of older adults. Our large sample size allowed us to reliably determine the strength of the correlations between force plate and smartphone measures. The most important practical implication of our results is that more repetitions or longer trials are required when using a smartphone instead of a force plate to assess balance.HighlightsWe compared balance measures simultaneously obtained from a phone and a force plateFor precision purposes, we included a large group of older participants (N=97).Using age as covariate, we found a moderate correlation across the two devices.Intra-class correlation coefficients were smaller for the smartphone.Balance assessment with smartphones requires longer trials compared to force plates.

scholarly journals Guideline for Selecting Types of Reliability and Suitable Intra-class Correlation Coefficients in Clinical Research

2021 ◽  
Author(s):  
Khalil Taherzadeh Chenani ◽  
Farzan Madadizadeh
Keyword(s):  
Clinical Research ◽  
Correlation Coefficients ◽  
Reliability Test ◽  
Research Information ◽  
Rater Reliability ◽  
Intra Class Correlation ◽  
Medical Researchers ◽  
Different Types ◽  
Test Retest Reliability ◽  
Cluster Correlation

Introduction: Reliability is an integral part of measuring the reproducibility of research information. Intra-cluster correlation coefficient (ICC) is one of the necessary indicators for reliability reporting, which can be misleading in terms of its diversity. The main purpose of this study was to introduce the types of reliability and appropriate ICC indices.  Methods: In this tutorial article, useful information about the types of reliability and indicators needed to report the results, as well as the types of ICC and its applications were explained for dummies. Results: Three general types of reliability include inter-rater reliability, test-retest reliability, and intra-rater reliability was presented. 10 different types of ICC were also introduced and explained. Conclusion: The research results may be misleading if any of the reliability types and calculation criteria types are chosen incorrectly. Therefore, to make the results of the study more accurate and valuable. Medical researchers must seek help from relevant guidelines such as this study before conducting reliability analysis.  

The Technology of Merging Single Force Plate Gait Trails to Simulate Full Gait Cycle in Environmental Health Research

2012 ◽  
Vol 518-523 ◽  
pp. 639-646
Author(s):  
Wang Yi ◽  
Hang Xu ◽  
Andrew Merryweather
Keyword(s):  
Gait Cycle ◽  
Force Plate ◽  
Correlation Coefficients ◽  
Biceps Femoris ◽  
Mean Square ◽  
Environmental Health Research ◽  
Single Force ◽  
Long Head ◽  
Model Correlation ◽  
Biceps Femoris Long Head

The article studies the way of combining double foot data into one gait cycle from data collected from only one force plate, and the reliability with comparing the Root Mean Square Error (RMSE) between combined and original trails is validated. The joint moment values, knee muscles value were also computed by OpenSim based on the dynamic model. Correlation coefficients and normalized RMSE were used as the compared factors between two trails. Correlation coefficients are all above 0.9 for joint moments, and all above 0.95 for knee muscles except for biceps femoris - long head. The technology would get higher reliability and improving the accuracy of simulation result by increasing the numbers of collection trails and selecting pairs trails which got higher correlation coefficients.

scholarly journals Serum proBDNF Is Associated With Changes in the Ketone Body β-Hydroxybutyrate and Shows Superior Repeatability Over Mature BDNF: Secondary Outcomes From a Cross-Over Trial in Healthy Older Adults

2021 ◽  
Vol 13 ◽  
Author(s):  
Jakob Norgren ◽  
Makrina Daniilidou ◽  
Ingemar Kåreholt ◽  
Shireen Sindi ◽  
Ulrika Akenine ◽  
...  
Keyword(s):  
Older Adults ◽  
Coconut Oil ◽  
Correlation Coefficients ◽  
Serum Levels ◽  
Small Sample ◽  
Delayed Response ◽  
Individual Change ◽  
Clinical Trial Registration ◽  
Intra Class Correlation ◽  
Healthy Older Adults

Background: β-hydroxybutyrate (BHB) can upregulate brain-derived neurotrophic factor (BDNF) in mice, but little is known about the associations between BHB and BDNF in humans. The primary aim here was to investigate whether ketosis (i.e., raised BHB levels), induced by a ketogenic supplement, influences serum levels of mature BDNF (mBDNF) and its precursor proBDNF in healthy older adults. A secondary aim was to determine the intra-individual stability (repeatability) of those biomarkers, measured as intra-class correlation coefficients (ICC).Method: Three of the arms in a 6-arm randomized cross-over trial were used for the current sub-study. Fifteen healthy volunteers, 65–75 y, 53% women, were tested once a week. Test oils, mixed in coffee and cream, were ingested after a 12-h fast. Labeled by their level of ketosis, the arms provided: sunflower oil (lowK); coconut oil (midK); caprylic acid + coconut oil (highK). Repeated blood samples were collected for 4 h after ingestion. Serum BDNF levels were analyzed for changes from baseline to 1, 2 and 4 h to compare the arms. Individual associations between BHB and BDNF were analyzed cross-sectionally and for a delayed response (changes in BHB 0–2 h to changes in BDNF at 0–4 h). ICC estimates were calculated from baseline levels from the three study days.Results: proBDNF increased more in highK vs. lowK between 0 and 4 h (z-score: β = 0.25, 95% CI 0.07–0.44; p = 0.007). Individual change in BHB 0–2 h, predicted change in proBDNF 0–4 h, (β = 0.40, CI 0.12–0.67; p = 0.006). Change in mBDNF was lower in highK vs. lowK at 0–2 h (β = −0.88, CI −1.37 to −0.40; p < 0.001) and cumulatively 0–4 h (β = −1.01, CI −1.75 to −0.27; p = 0.01), but this could not be predicted by BHB levels. ICC was 0.96 (95% CI 0.92–0.99) for proBDNF, and 0.72 (CI 0.47–0.89) for mBDNF.Conclusions: The findings support a link between changes in peripheral BHB and proBDNF in healthy older adults. For mBDNF, changes differed between arms but independent to BHB levels. Replication is warranted due to the small sample. Excellent repeatability encourages future investigations on proBDNF as a predictor of brain health.Clinical Trial Registration:ClinicalTrials.gov, NCT03904433.

scholarly journals The Test–Retest Reliability of Bilateral and Unilateral Force Plate–Derived Parameters of the Countermovement Push-Up in Elite Boxers

2020 ◽  
pp. 1-5
Author(s):  
Gemma N. Parry ◽  
Lee C. Herrington ◽  
Ian G. Horsley ◽  
Ian Gatt
Keyword(s):  
Upper Limb ◽  
Coefficient Of Variation ◽  
Athletic Performance ◽  
Intraclass Correlation ◽  
Force Plate ◽  
Correlation Coefficients ◽  
Vertical Stiffness ◽  
Intraclass Correlation Coefficients ◽  
Test Retest Reliability ◽  
Push Up

Context: Maximal power describes the ability to immediately produce power with the maximal velocity at the point of release, impact, and/or take off—the greater an athlete’s ability to produce maximal power, the greater the improvement of athletic performance. In reference to boxing performance, regular consistent production of high muscular power during punching is considered an essential prerequisite. Despite the importance of upper limb power to athletic performance, presently, there is no gold standard test for upper limb force development performance. Objective: To investigate the test–retest reliability of the force plate–derived measures of countermovement push-up in elite boxers. Design: Test–retest design. Setting: High Performance Olympic Training Center. Participants: Eighteen elite Olympic boxers (age = 23 [3] y; height = 1.68 [0.39] m; body mass = 70.0 [17] kg). Intervention: Participants performed 5 repetitions of countermovement push-up trials on FD4000 Forcedeck dual force platforms on 2 separate test occasions 7 days apart. Main Outcome Measures: Peak force, mean force, flight time, rate of force development, impulse, and vertical stiffness of the bilateral and unilateral limbs from the force–time curve. Results: No significant differences between the 2 trial occasions for any of the derived bilateral or unilateral performance measures. Intraclass correlation coefficients indicated moderate to high reliability for performance parameters (intraclass correlation coefficients = .68–.98) and low coefficient of variation (3%–10%) apart from vertical stiffness (coefficient of variation = 16.5%–25%). Mean force demonstrated the greatest reliability (coefficient of variation = 3%). In contrast, no significant differences (P < .001) were noted between left and right limbs (P = .005–.791), or between orthodox or southpaw boxing styles (P = .19–.95). Conclusion: Force platform–derived kinetic bilateral and unilateral parameters of countermovement push-up are reliable measures of upper limb power performance in elite-level boxers; results suggest unilateral differences within the bilateral condition are not the norm for an elite boxing cohort.

scholarly journals Test-retest reliability for HAQ-DI and SF-36 PF for the measurement of physical function in psoriatic arthritis

2021 ◽  
pp. jrheum.210175
Author(s):  
Ying Ying Leung ◽  
William Tillett ◽  
Pil Hojgaard ◽  
Ana-Maria Orbai ◽  
Richard Holland ◽  
...  
Keyword(s):  
Psoriatic Arthritis ◽  
Short Form ◽  
Health Assessment ◽  
Correlation Coefficients ◽  
Intra Class Correlation ◽  
Retest Reliability ◽  
Sf 36 ◽  
Reliability Performance ◽  
Test Retest Reliability

Objective Due to no existing data, we aimed to derive evidence to support test-retest reliability for the Health Assessment Questionnaire-Disability Index (HAQ-DI) and Medical Outcome Survey Short-Form-36 item physical functioning domain (SF-36 PF) in psoriatic arthritis (PsA). Methods We identified datasets that collected relevant data for test-retest reliability for HAQ-DI and SF-36 PF; and evaluated them using OMERACT Filter 2.1 methodology. We calculated intra-class correlation coefficients (ICC) as a measure of test-retest reliability. We then conducted a quality assessment and evaluated the adequacy of test-retest reliability performance. Results Two datasets were identified for HAQ-DI and one for SF-36 PF in PsA. The quality of the datasets was good. The ICCs for HAQ-DI were excellent in both datasets: 0.94 (95% CI: 0.88 to 0.97) and 0.94 (95% CI: 0.89 to 0.97). The ICC of SF-36 PF was good (0.89, 95% CI: 0.76 to 0.95). The performance of test-retest reliability for both instruments was judged to be adequate. Conclusion The new data derived support good and reasonable test-retest reliability for HAQ-DI and SF-36 PF in PsA.

scholarly journals Comparison of a Nintendo Wii balance board with a laboratory-grade force plate on measurement of transitional movements

Kinesiology ◽  
2019 ◽  
Vol 51 (1) ◽  
pp. 35-51
Author(s):  
Francesco Sgrò ◽  
Roberto Coppola ◽  
Salvatore Pignato ◽  
Mario Lipoma
Keyword(s):  
Force Plate ◽  
Vertical Component ◽  
Correlation Coefficients ◽  
Elderly Age ◽  
Nintendo Wii ◽  
Intra Class Correlation ◽  
Sit To Stand ◽  
Wii Balance Board ◽  
High Level ◽  
Balance Board

The aim of this study was to verify whether the Nintendo Wii-Balance-Board was valid and reliable for assessing sit-to-stand and return-to-sit tasks by comparing it with a gold-standard force plate. Ten elderly (age = 78.21±14.82 years; males=4; females=6) and eleven young (age =24.25±12.43 years; males=6; females=5) participants of both genders performed five sit-to-stand and return-to-sit tasks consecutively by placing their feet on the Wii-Balance-Board; after two days of rest, they repeated the same assessment. The Wii-Balance- Board was positioned over the force plate to concurrently acquire the vertical component of ground reaction forces. Relevant kinetic and temporal parameters were estimated from these signals. Both the Wii-Balance-Board and force plate measurements resulted in a high level of correlation for almost all the parameters (Pearson’s product-moment r ranged from 0.91 to 0.99, p&lt;.001) and, for the same parameters, intra-class correlation coefficients revealed a high level of agreement between the devices (ranged from 0.93 to 0.99). Bland-Altman plots and regression analysis detected systematic and fixed biases for two parameters (i.e., the inclination of force in standing and rising), while other parameters resulted with none systematic biases; the absolute magnitude of those differences was trivial or small (standardized biases ranged from 0.01 to 0.4). A high level of intra-device reliability was measured for all the parameters (intra-class correlation coefficients ranged from 0.85 to 0.99). The Wii-Balance-Board proved valid and reliable in comparison with a force plate for assessing transition movements so it can be considered a valuable solution for supporting the assessment procedures of average practitioners.

scholarly journals Reliability, validity and psychometric properties of the Greek translation of the posttraumatic stress disorder scale

2017 ◽  
Vol 9 (1) ◽  
pp. 5-9
Author(s):  
Konstantinos Kontoangelos ◽  
Sofia Tsiori ◽  
Garyfalia Poulakou ◽  
Konstantinos Protopapas ◽  
Ioannis Katsarolis ◽  
...  
Keyword(s):  
Posttraumatic Stress Disorder ◽  
Posttraumatic Stress ◽  
Stress Disorder ◽  
Correlation Coefficients ◽  
Post Traumatic Stress ◽  
Greek Version ◽  
Intra Class Correlation ◽  
Post Traumatic ◽  
Test Retest Reliability ◽  
Scree Test

The Greek version of the Davidson Trauma Scale (DTS) was developed to respond to the need of Greek-speaking individuals. The translated questionnaire was administered to 128 HIV outpatients (aged 37.1±9.1) and 166 control patients (aged 32.4±13.4). In addition to the DTS Greek scale, subjects were assessed with two other scales useful for assessing validity. For each factor analyses two components were extracted, based on Cattell's scree test. The two components solution accounted for 55.34% of the total variation in case of frequency variables and 61.45% in case of severity variables. The Cronbach's alpha coefficient and Guttman split-half coefficient of the DTS scale were 0.93 and 0.88 respectively. The test-retest reliability of the Greek version of DTS scale proved to be satisfactory. Individual items had good intra-class correlation coefficients higher than 0.5, which means that all questions have high levels of external validity. The psychometric strength of interview for post-traumatic stress disorder-Greek version it's reliable for its future use, particularly for screening subjects with possible diagnosis of posttraumatic stress disorder.

scholarly journals Reliability, validity and psychometric properties of the Greek translation of the posttraumatic stress disorder scale

2017 ◽  
Vol 9 (1) ◽  
Author(s):  
Konstantinos Kontoangelos ◽  
Sofia Tsiori ◽  
Garyfalia Poulakou ◽  
Konstantinos Protopapas ◽  
Ioannis Katsarolis ◽  
...  
Keyword(s):  
Posttraumatic Stress Disorder ◽  
Posttraumatic Stress ◽  
Stress Disorder ◽  
Correlation Coefficients ◽  
Factor Analyses ◽  
Greek Version ◽  
Alpha Coefficient ◽  
Intra Class Correlation ◽  
Test Retest Reliability ◽  
Scree Test

The Greek version of the Davidson Trauma Scale (DTS) was developed to respond to the need of Greek-speaking individuals. The translated questionnaire was administered to 128 HIV outpatients (aged 37.1±9.1) and 166 control patients (aged 32.4±13.4). In addition to the DTS Greek scale, subjects were assessed with two other scales useful for assessing validity. For each factor analyses two components were extracted, based on Cattell’s scree test. The two components solution accounted for 55.34% of the total variation in case of frequency variables and 61.45% in case of severity variables. The Cronbach’s alpha coefficient and Guttman split-half coefficient of the DTS scale were 0.93 and 0.88 respectively. The test-retest reliability of the Greek version of DTS scale proved to be satisfactory. Individual items had good intra-class correlation coefficients higher than 0.5, which means that all questions have high levels of external validity. The psychometric strength of interview for posttraumatic stress disorder-Greek version it’s reliable for its future use, particularly for screening subjects with possible diagnosis of posttraumatic stress disorder.

scholarly journals Gait Variability Using Waist- and Ankle-Worn Inertial Measurement Units in Healthy Older Adults

Sensors ◽  
2020 ◽  
Vol 20 (10) ◽  
pp. 2858 ◽  
Author(s):  
Timo Rantalainen ◽  
Laura Karavirta ◽  
Henrikki Pirkola ◽  
Taina Rantanen ◽  
Vesa Linnamo
Keyword(s):  
Older Adults ◽  
Correlation Coefficient ◽  
Concurrent Validity ◽  
Force Plate ◽  
Gait Variability ◽  
Inertial Measurement Units ◽  
Healthy Older Adults ◽  
Inertial Measurement ◽  
Measurement Units ◽  
Stride Duration

Gait variability observed in step duration is predictive of impending adverse health outcomes among apparently healthy older adults and could potentially be evaluated using wearable sensors (inertial measurement units, IMU). The purpose of the present study was to establish the reliability and concurrent validity of gait variability and complexity evaluated with a waist and an ankle-worn IMU. Seventeen women (age 74.8 (SD 44) years) and 10 men (73.7 (4.1) years) attended two laboratory measurement sessions a week apart. Their stride duration variability was concurrently evaluated based on a continuous 3 min walk using a force plate and a waist- and an ankle-worn IMU. Their gait complexity (multiscale sample entropy) was evaluated from the waist-worn IMU. The force plate indicated excellent stride duration variability reliability (intra-class correlation coefficient, ICC = 0.90), whereas fair to good reliability (ICC = 0.47 to 0.66) was observed from the IMUs. The IMUs exhibited poor to excellent concurrent validity in stride duration variability compared to the force plate (ICC = 0.22 to 0.93). A good to excellent reliability was observed for gait complexity in most coarseness scales (ICC = 0.60 to 0.82). A reasonable congruence with the force plate-measured stride duration variability was observed on many coarseness scales (correlation coefficient = 0.38 to 0.83). In conclusion, waist-worn IMU entropy estimates may provide a feasible indicator of gait variability among community-dwelling ambulatory older adults.

scholarly journals Psychometric Properties of the NIH Toolbox Cognition Battery in Healthy Older Adults: Reliability, Validity, and Agreement with Standard Neuropsychological Tests

2019 ◽  
Vol 25 (08) ◽  
pp. 857-867 ◽  
Author(s):  
Emmi P. Scott ◽  
Anne Sorrell ◽  
Andreana Benitez
Keyword(s):  
Older Adults ◽  
Psychometric Properties ◽  
Neuropsychological Tests ◽  
Discriminant Validity ◽  
Brain Mri ◽  
Reliability And Validity ◽  
Correlation Coefficients ◽  
Retest Reliability ◽  
Healthy Older Adults ◽  
Test Retest Reliability

AbstractObjective:Few independent studies have examined the psychometric properties of the NIH Toolbox Cognition Battery (NIHTB-CB) in older adults, despite growing interest in its use for clinical purposes. In this paper we report the test–retest reliability and construct validity of the NIHTB-CB, as well as its agreement or concordance with traditional neuropsychological tests of the same construct to determine whether tests could be used interchangeably.Methods:Sixty-one cognitively healthy adults ages 60–80 completed “gold standard” (GS) neuropsychological tests, NIHTB-CB, and brain MRI. Test–retest reliability, convergent/discriminant validity, and agreement statistics were calculated using Pearson’s correlations, concordance correlation coefficients (CCC), and root mean square deviations.Results:Test–retest reliability was acceptable (CCC = .73 Fluid; CCC = .85 Crystallized). The NIHTB-CB Fluid Composite correlated significantly with cerebral volumes (r’s = |.35−.41|), and both composites correlated highly with their respective GS composites (r’s = .58−.84), although this was more variable for individual tests. Absolute agreement was generally lower (CCC = .55 Fluid; CCC = .70 Crystallized) due to lower precision in fluid scores and systematic overestimation of crystallized composite scores on the NIHTB-CB.Conclusions:These results support the reliability and validity of the NIHTB-CB in healthy older adults and suggest that the fluid composite tests are at least as sensitive as standard neuropsychological tests to medial temporal atrophy and ventricular expansion. However, the NIHTB-CB may generate different estimates of performance and should not be treated as interchangeable with established neuropsychological tests.

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