Validity and Interinstrument Reliability of a Medical Grade Physical Activity Monitor in Older Adults

2021 ◽  
Vol 4 (1) ◽  
pp. 31-38
Author(s):  
Myles W. O’Brien ◽  
William R. Wojcik ◽  
Jonathon R. Fowles
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Vigorous Physical Activity ◽  
Intraclass Correlation ◽  
Activity Monitor ◽  
Moderate Physical Activity ◽  
Step Rate ◽  
Medical Grade

Wearable physical activity monitors are associated with an increase in user’s habitual physical activity levels. Most of the older adult population do not meet the national moderate- to vigorous-intensity physical activity (MVPA) recommendations and may benefit from being prescribed a physical activity monitor. The PiezoRx is a class one medical grade device that uses step rate thresholds to measure MVPA. The validity and reliability of the PiezoRx in measuring MVPA has yet to be determined in older persons. We assessed the validity and interinstrument reliability of the PiezoRx to measure steps and MVPA in older adults. Participants (n = 19; 68.8 ± 2.3 years) wore an Omron HJ-320 pedometer, ActiGraph GT3X accelerometer, and four PiezoRx monitors during a five-stage treadmill walking protocol. The PiezoRx devices were set at moderate physical activity and vigorous physical activity step rate thresholds (steps per minute) of 100/120, 110/130, adjusted for height and adjusted for height + fitness. The PiezoRx exhibited a stronger correlation (intraclass correlation coefficient = .82) with manually counted steps than the ActiGraph (intraclass correlation coefficient = .53) and Omron (intraclass correlation coefficient = .54) and had a low absolute percentage error (3 ± 6%). The PiezoRx with moderate physical activity/vigorous physical activity step thresholds adjusted to 110/130 was strongly correlated to indirect calorimetry (0.84, p < .001) and best distinguished each walking stage as MVPA or not (sensitivity: 88%; specificity: 95%). The PiezoRx monitor is a valid and reliable measure of step count and MVPA among older adults. The device’s ability to measure MVPA in absolute terms was improved when step rate thresholds for moderate physical activity/vigorous physical activity were increased to 110/130 steps per minute in this population.

scholarly journals Medical-Grade Physical Activity Monitoring for Measuring Step Count and Moderate-to-Vigorous Physical Activity: Validity and Reliability Study (Preprint)

2018 ◽  
Author(s):  
Myles William O'Brien ◽  
William Robert Wojcik ◽  
Jonathon Richard Fowles
Keyword(s):  
Physical Activity ◽  
Vigorous Physical Activity ◽  
Intraclass Correlation ◽  
Step Count ◽  
Validity And Reliability ◽  
Step Rate ◽  
Physical Activity Monitoring ◽  
Adult Participants ◽  
Step Counting ◽  
Medical Grade

BACKGROUND The use of physical activity (PA) monitors is commonly associated with an increase in habitual PA level in healthy and clinical populations. The PiezoRx is a medical-grade PA monitor that uses adjustable step rate thresholds to estimate moderate-to-vigorous physical activity (MVPA) and is a valid indicator of free-living PA in adults. Laboratory validation of step count derived MVPA in adults is needed to justify the use of these monitors in clinical practice to track individuals’ progress toward meeting PA guidelines that are based on MVPA, not steps. OBJECTIVE The objective of our study was to assess the validity and interinstrument reliability of the PiezoRx to derive step count and MVPA in a laboratory setting compared with criterion measures and other frequently used PA monitors in a diverse sample of adults. METHODS The adult participants (n=43; 39.4 years, SD 15.2) wore an Omron HJ-320 pedometer, an ActiGraph GT3X accelerometer, and four PiezoRx monitors during a progressive treadmill protocol conducted for 6 minutes at speeds of 2.4, 3.2, 4.0, 5.6, 6.4, and 7.2 km/hour, respectively. The four PiezoRx monitors were set at different MVPA step rate thresholds (MPA in steps/minute/VPA in steps/minute) 100/120, 110/130, height adjusted, and height+fitness adjusted. RESULTS The PiezoRx was more correlated (intraclass correlation, ICC=.97; P<.001) to manual step counting than the ActiGraph (ICC=.72; P<.001) and Omron (ICC=.62; P<.001). The PiezoRxs absolute percent error in measuring steps was 2.2% (ActiGraph=15.9%; Omron=15.0%). Compared with indirect calorimetry, the height-adjusted PiezoRx and ActiGraph were accurate measures of the time spent in MVPA (both ICC=.76; P<.001). CONCLUSIONS The PiezoRx PA monitor appears to be a valid and reliable measure of step count and MVPA in this diverse sample of adults. The device’s ability to measure MVPA may be improved when anthropometric differences are considered, performing at par or better than a research grade accelerometer.

scholarly journals Impact of first and second eye cataract surgery on physical activity: a prospective study

BMJ Open ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. e024491 ◽  
Author(s):  
Lynn B Meuleners ◽  
Ying Ru Feng ◽  
Michelle Fraser ◽  
Kate Brameld ◽  
Kyle Chow
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Cataract Surgery ◽  
Leisure Time ◽  
Leisure Time Physical Activity ◽  
Vigorous Physical Activity ◽  
Moderate Physical Activity ◽  
Bilateral Cataract ◽  
Eye Surgery ◽  
The Impact

ObjectivesTo investigate the impact of first eye and second eye cataract surgery on the level of physical activity undertaken by older adults with bilateral cataract.DesignProspective cohort study.SettingThree public ophthalmology clinics in Western Australia.ParticipantsFifty-five older adults with bilateral cataract aged 55+ years, awaiting first eye cataract surgery.Outcome measuresThe primary outcome measure was participation in moderate leisure-time physical activity. The secondary outcomes were participation in walking, gardening and vigorous leisure-time physical activity. Participants completed a researcher-administered questionnaire, containing the Active Australia Survey and visual tests before first eye cataract surgery, after first eye surgery and after second eye surgery. A Generalised Estimating Equation linear regression model was undertaken to analyse the change in moderate leisure-time physical activity participation before first eye surgery, after first eye surgery and after second eye surgery, after accounting for relevant confounders.ResultsParticipants spent significantly less time per week (20 min) on moderate leisure-time physical activity before first eye cataract surgery compared with after first eye surgery (p=0.04) after accounting for confounders. After second eye cataract surgery, participants spent significantly more time per week (32 min) on moderate physical activity compared with after first eye surgery (p=0.02). There were no significant changes in walking, gardening and vigorous physical activity throughout the cataract surgery process.ConclusionFirst and second eye cataract surgery each independently increased participation in moderate leisure-time physical activity. This provides a rationale for timely first and second eye cataract surgery for bilateral cataract patients, even when they have relatively good vision.

scholarly journals The Inventory of Physical Activity Barriers for Adults 50 Years and Older: Refinement and Validation

2021 ◽  
Vol 5 (Supplement_1) ◽  
pp. 789-789
Author(s):  
Mariana Wingood ◽  
Salene Jones ◽  
Nancy Gell ◽  
Denise Peters ◽  
Jennifer Brach
Keyword(s):  
Physical Activity ◽  
Factor Analysis ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Assessment Tool ◽  
Intraclass Correlation ◽  
Community Dwelling ◽  
Cross Sectional ◽  
Retest Reliability ◽  
Test Retest Reliability

Abstract Addressing physical activity (PA) barriers is an essential component of increasing PA among the 56-73% of community-dwelling adults 50 years and older who are not performing the recommended 150 minutes of moderate-to-vigorous PA. As there is no feasible, multi-factorial tool to assess PA barriers among this population, we developed and validated a PA barrier assessment tool called the Inventory of Physical Activity Barriers (IPAB). We collected cross-sectional data on 503 adults (mean age 70.1), with 79 participants completing the scale twice for test-retest reliability and 64 completing a cross-over design examining the ability to use two administration formats interchangeably. Our analyses consisted of exploratory and confirmatory factor analysis, Cronbach alpha, intraclass correlation coefficient, Bland-Altman Plot, and t-tests. Using factor analysis, we identified and confirmed an eight-factor solution consisting of 27 items. The 27-item IPAB is internally consistent (alpha= 0.91), has a high test-retest reliability (intraclass correlation coefficient=0.99), and can differentiate between individuals who meet the recommended levels of PA and those who do not (p &lt; 0.001). The IPAB scores ranged between 1.00-3.11 for the paper format (mean=1.78) and 1.07-3.48 for the electronic format (mean=1.78), with no statistical difference between the paper and electronic administration formats (p=0.94), resulting in the conclusion that the two administration formats can be used interchangeably. Participant feedback illustrates that the IPAB is easy to use, has clear instruction, and is an appropriate length. The newly validated IPAB scale can be used to develop individualized PA interventions that address PA barriers among patients 50 years and older.

Validation of a web-based, time-use application to assess children’s movement behaviours: My E-Diary for Activities and Lifestyle (MEDAL) (Preprint)

2021 ◽  
Author(s):  
Sarah Yi Xuan Tan ◽  
Airu Chia ◽  
Bee Choo Tai ◽  
Padmapriya Natarajan ◽  
Claire Marie Jie Lin Goh ◽  
...  
Keyword(s):  
Physical Activity ◽  
Correlation Coefficient ◽  
Time Use ◽  
Vigorous Physical Activity ◽  
Intraclass Correlation ◽  
Movement Behaviour ◽  
Night Sleep ◽  
Web Based ◽  
Self Reports ◽  
Measured Time

BACKGROUND Existing modes of collecting self-reported 24-hour movement information from children, including digital assessments, have not been demonstrated to be of acceptable validity when compared to objective measurements. My E-Diary for Activities and Lifestyle (MEDAL) is an interactive web-based diary developed to collect time-use information from children aged 10 years and older. OBJECTIVE This study compared self-reported and accelerometer-measured time spent in movement behaviour among children in Singapore aged 10–11 years. METHODS Participants recorded their daily activities using MEDAL over two specified weekdays and two weekend days, and wore an Actigraph accelerometer on their non-dominant wrist throughout the study to objectively assess movement behaviours. Spearman correlation coefficient and intraclass correlation coefficient were used to compare the accelerometer measurements and self-reports for each movement behaviour. Bland-Altman plots were generated to investigate trends of bias in the self-reports. RESULTS Among the participants aged 10-11 years (n=49, 59% boys), we observed that children reported lower light physical activity (LPA), and higher moderate-to-vigorous physical activity (MVPA), inactivity and night sleep than accelerometer-measured. There was moderate to strong correlation between self-reported and accelerometer-measured MVPA (r=0.37, 95% CI 0.20–0.54), inactivity (r=0.36, 95% CI 0.18–0.54) and night sleep (r=0.58, 95% CI 0.43–0.74); the correlation for LPA was poor (r=0.19, 95% CI 0.02–0.36). Agreement was poor for all behaviours (MVPA ICC 0.24, 95% CI 0.07–0.40; LPA ICC=0.19, 95% CI 0.01–0.36; inactivity ICC=0.29, 95% CI 0.11–0.44; night sleep ICC=0.45, 95% CI 0.29–0.58). There was stronger correlation and agreement on weekdays for inactivity and night sleep; conversely, there was stronger correlation and agreement for MVPA and LPA on weekend days. Finally, we observed that with increasing MVPA, children tended to report higher MVPA than accelerometer measurements. There were no clear trends for the other behaviours. CONCLUSIONS MEDAL may be used to assess movement behaviours of children. Based on self-reports, the children are able to estimate their time spent in MVPA, inactivity and night sleep, although actual time spent in these behaviours may differ from accelerometer-derived estimates; self-reported LPA warrant cautious interpretation. Observable differences in reporting accuracy exist between weekdays and weekend days.

scholarly journals Leisure-Time Physical Activity and Metabolic Syndrome in Older Adults

2019 ◽  
Vol 16 (18) ◽  
pp. 3358 ◽  
Author(s):  
Gallardo-Alfaro ◽  
Bibiloni ◽  
Mateos ◽  
Ugarriza ◽  
Tur
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Metabolic Syndrome ◽  
Energy Expenditure ◽  
Leisure Time ◽  
Leisure Time Physical Activity ◽  
Vigorous Physical Activity ◽  
Cross Sectional Study ◽  
Moderate Physical Activity ◽  
Cross Sectional

Background: Metabolic syndrome (MetS) is a cluster of risk factors for cardiovascular disease, atherosclerosis and diabetes mellitus type 2 which may be reduced by practicing regular physical activity. Objective: To assess the leisure-time physical activity (LTPA) of older adults with MetS and without MetS. Methods: Cross-sectional study of older adults (55–80 years old) from Balearic Islands (Spain) with MetS (n = 333; 55% men) and without MetS (n = 144; 43.8% men). LTPA was assessed with the validated Spanish version of the Minnesota LTPA Questionnaire. Two criteria of physically active were used: >150 min/week of moderate physical activity or >75 min/week of vigorous physical activity or a combination of both, and total leisure-time energy expenditure of >300 MET·min/day. Sociodemographic and lifestyle characteristics, anthropometric variables, MetS components, and adherence to the Mediterranean diet (MD) were also measured. Results: MetS subjects showed lower energy expenditure in LTPA, lower adherence to the MD, higher obesity and waist circumference, and were less active than non-MetS peers. LTPA increased as participants got older and there was higher LTPA intensity as educational level increased. Adherence to MD was as high as LTPA was. Conclusions: MetS is associated with physical inactivity and unhealthy diet. To increase LTPA recommendations and raise awareness in the population about the health benefits of PA and high adherence to MD is highly recommended.

scholarly journals Influence of Anthropometrics on Step-Rate Thresholds for Moderate and Vigorous Physical Activity in Older Adults: Scientific Modeling Study

JMIR Aging ◽  
10.2196/12363 ◽  
2018 ◽  
Vol 1 (2) ◽  
pp. e12363 ◽  
Author(s):  
Myles William O'Brien ◽  
Matthew Jordan Kivell ◽  
William Robert Wojcik ◽  
Ghislain Richard D'Entremont ◽  
Derek Stephen Kimmerly ◽  
...  
Keyword(s):  
Physical Activity ◽  
Older Adults ◽  
Vigorous Physical Activity ◽  
Scientific Modeling ◽  
Step Rate ◽  
Modeling Study

scholarly journals Adaptation and reproducibility of a questionnaire to evaluate physical activity among the Comcáac (Seri) community of Sonora, Mexico

2017 ◽  
Vol 27 (1) ◽  
pp. 76-82 ◽  
Author(s):  
Marcos Lavandera-Torres ◽  
Julián Esparza-Romero
Keyword(s):  
Physical Activity ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Intraclass Correlation ◽  
Future Research ◽  
Physical Activity Questionnaire ◽  
Obesity And Diabetes ◽  
Occupational Activities ◽  
Spearman Coefficient ◽  
Activity Questionnaire

Physical activity questionnaire (PAQ) is the most widely used method for evaluation of physical activity (PA). The aim of this study was to adapt and evaluate reproducibility of a PAQ in Comcáac community of Sonora, Mexico. Adaptation of PAQ was conducted through interviews with key residents. Reproducibility was evaluated applying PAQ twice to 26 persons within 20 or more years old, using Spearman coefficient ρ and intraclass correlation coefficient (ICC). High correlations (p < 0.05) were found in total previous-year and previous-week recreational activities (ρ= 0.82 and ρ= 0.76, respectively). Correlations were equally high for occupational activities group related to craftwork manufacture (ρ= 0.96 and ρ= 0.74) and fishery activities (ρ= 0.93 and ρ= 0.78) for previous-year and previous-week, respectively. Adapted PAQ could be a useful tool to evaluate PA pattern in community and can be used in future research on association between PA, obesity and diabetes. 

scholarly journals Reliability of Measures of N1 Peak Amplitude of the Compound Action Potential in Younger and Older Adults

2018 ◽  
Vol 61 (9) ◽  
pp. 2422-2430 ◽  
Author(s):  
Carolyn M. McClaskey ◽  
James W. Dias ◽  
Judy R. Dubno ◽  
Kelly C. Harris
Keyword(s):  
Older Adults ◽  
Action Potential ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Measurement Techniques ◽  
Intraclass Correlation ◽  
Compound Action Potential ◽  
Retest Reliability ◽  
Test Retest Reliability ◽  
Compound Action

Purpose Human auditory nerve (AN) activity estimated from the amplitude of the first prominent negative peak (N1) of the compound action potential (CAP) is typically quantified using either a peak-to-peak measurement or a baseline-corrected measurement. However, the reliability of these 2 common measurement techniques has not been evaluated but is often assumed to be relatively poor, especially for older adults. To address this question, the current study (a) compared test–retest reliability of these 2 methods and (b) tested the extent to which measurement type affected the relationship between N1 amplitude and experimental factors related to the stimulus (higher and lower intensity levels) and participants (younger and older adults). Method Click-evoked CAPs were recorded in 24 younger (aged 18–30 years) and 20 older (aged 55–85 years) adults with clinically normal audiograms up to 3000 Hz. N1 peak amplitudes were estimated from peak-to-peak measurements (from N1 to P1) and baseline-corrected measurements for 2 stimulus levels (80 and 110 dB pSPL). Baseline-corrected measurements were made with 4 baseline windows. Each stimulus level was presented twice, and test–retest reliability of these 2 measures was assessed using the intraclass correlation coefficient. Linear mixed models were used to evaluate the extent to which age group and click level uniquely predicted N1 amplitude and whether the predictive relationships differed between N1 measurement techniques. Results Both peak-to-peak and baseline-corrected measurements of N1 amplitude were found to have good-to-excellent reliability, with intraclass correlation coefficient values > 0.60. As expected, N1 amplitudes were significantly larger for younger participants compared with older participants for both measurement types and were significantly larger in response to clicks presented at 110 dB pSPL than at 80 dB pSPL for both measurement types. Furthermore, the choice of baseline window had no significant effect on N1 amplitudes using the baseline-corrected method. Conclusions Our results suggest that measurements of AN activity can be robustly and reliably recorded in both younger and older adults using either peak-to-peak or baseline-corrected measurements of the N1 of the CAP. Peak-to-peak measurements yield larger N1 response amplitudes and are the default measurement type for many clinical systems, whereas baseline-corrected measurements are computationally simpler. Furthermore, the relationships between AN activity and stimulus- and participant-related variables were not affected by measurement technique, which suggests that these relationships can be compared across studies using different techniques for measuring the CAP N1.

Reliability and Fall-Risk Predictability of the Short Form of the Fullerton Advanced Balance Scale in Iranian Older Adults

2021 ◽  
pp. 1-8
Author(s):  
Ehsan Sinaei ◽  
Debra J. Rose ◽  
Samira Javadpour ◽  
Amin Kordi Yoosefinejad
Keyword(s):  
Older Adults ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Short Form ◽  
Intraclass Correlation ◽  
Community Dwelling ◽  
Intrarater Reliability ◽  
Falls In Older Adults ◽  
Community Dwelling Older Adults ◽  
Acceptable Internal Consistency

Recently, a short form of the Fullerton Advanced Balance (SF-FAB) scale was reported as a good predictor of falls in older adults. However, we found no evidence regarding its reliability in non-American older adults. Therefore, we aimed to analyze the reliability and homogeneity of the SF-FAB scale to measure postural balance in Iranian older adults. Eighty-five community-dwelling older adults (70.75 ± 4.97 years) performed the SF-FAB test on two occasions 1 week apart. In both instances, four raters assessed the performance on the test. The SF-FAB scale (mean total score: 12.46 ± 3.53) revealed acceptable internal consistency (Cronbach’s α = .77), excellent intrarater reliability (intraclass correlation coefficient = .94–.99), and excellent interrater reliability (intraclass correlation coefficient = .92–.99). The overall prediction success rate was 83.5% with correctly classifying 95.6% of nonfallers and 35.3% of fallers. The SF-FAB scale can provide a quick screen of balance status in older adults to trigger referral to clinicians for a more comprehensive assessment.

Reliability and Validity of the Sit-to-Stand as a Muscular Power Measure in Older Adults

2020 ◽  
Vol 28 (3) ◽  
pp. 455-466 ◽  
Author(s):  
Jennifer J. Sherwood ◽  
Cathy Inouye ◽  
Shannon L. Webb ◽  
Jenny O
Keyword(s):  
Older Adults ◽  
Correlation Coefficient ◽  
Intraclass Correlation Coefficient ◽  
Handgrip Strength ◽  
Intraclass Correlation ◽  
Negative Relationship ◽  
Reliability And Validity ◽  
Sit To Stand ◽  
Relationship Of ◽  
The Relationship

The study aims were to analyze the reliability and validity of the GymAware™ linear position transducer’s velocity and power measures during the sit-to-stand, compared with the Dartfish 2D videography analysis, and to assess the relationship of age and handgrip strength with velocity and power in 48 older men and women (77.6 ± 11.1 years). The results showed excellent agreement between GymAware- and Dartfish-derived sit-to-stand velocity (intraclass correlation coefficient2-1 = .94 and power intraclass correlation coefficient2-1 = .98) measures. A moderate and negative relationship was found between age and velocity (r = −.62; p < .001) and age and power (r = −.63; p < .001). A moderate and positive relationship was found between handgrip strength and velocity (r = .43; p = .002) and handgrip strength and power (r = .54; p < .001). The results show the GymAware velocity and power measures during the sit-to-stand in older adults to be reliable and valid.

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