Enhanced Accuracy of Continuous Glucose Monitoring during Exercise through Physical Activity Tracking Integration

Current Continuous Glucose Monitors (CGM) exhibit increased estimation error during periods of aerobic physical activity. The use of readily-available exercise monitoring devices opens new possibilities for accuracy enhancement during these periods. The viability of an array of physical activity signals provided by three different wearable devices was considered. Linear regression models were used in this work to evaluate the correction capabilities of each of the wearable signals and propose a model for CGM correction during exercise. A simple two-input model can reduce CGM error during physical activity (17.46% vs. 13.8%, p < 0.005) to the magnitude of the baseline error level (13.61%). The CGM error is not worsened in periods without physical activity. The signals identified as optimal inputs for the model are “Mets” (Metabolic Equivalent of Tasks) from the Fitbit Charge HR device, which is a normalized measurement of energy expenditure, and the skin temperature reading provided by the Microsoft Band 2 device. A simpler one-input model using only “Mets” is also viable for a more immediate implementation of this correction into market devices.

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The Impact of Isolation Due to COVID-19 on Physical Activity Levels in Adult Students

Sustainability ◽

10.3390/su13020446 ◽

2021 ◽

Vol 13 (2) ◽

pp. 446

Author(s):

Anna Rutkowska ◽

Katarzyna Kacperak ◽

Sebastian Rutkowski ◽

Luisa Cacciante ◽

Pawel Kiper ◽

...

Keyword(s):

Physical Activity ◽

Adult Students ◽

International Physical Activity Questionnaire ◽

Activity Levels ◽

Metabolic Equivalent ◽

Free Mobility ◽

Significant Difference ◽

Sport And Recreation ◽

The Impact ◽

Activity Questionnaire

The lockdown with a prohibition of free mobility introduced in many countries has affected restrictions in physical activity (PA). The purpose of the study was to compare PA during restrictions and the “unfreezing” stage. The study group consisted of 89 healthy adult students. To assess the level of PA, a long version of the International Physical Activity Questionnaire (IPAQ) was used. The first evaluation was carried out in the period from 16 to 20 April 2020 at the time of the lockdown and the second in the period from 11 to 14 May 2020 during the so-called “unfreezing”. The average total PA rate during the first measurement was 8640 metabolic equivalent (MET)-min/week and in the second, 10,560 MET-min/week. The analysis of total energy expenditure showed a statistically significant difference (p < 0.029). The establishment of “unfreezing” laws for sport and recreation and the reduction of restrictions have significantly contributed to an increase in the overall level of PA. Based on our outcomes, we recommend students follow the scientific guidelines for undertaking PA (i.e., WHO) during the pandemic in order to maintain an appropriate pro-healthy dose of exercise.

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Anthropometric Variables as Mediators of the Association of Changes in Diet and Physical Activity With Inflammatory Profile

The Journals of Gerontology Series A ◽

10.1093/gerona/glab072 ◽

2021 ◽

Author(s):

Gabriela Cárdenas-Fuentes ◽

Camille Lassale ◽

Miguel Ángel Martínez-González ◽

María Grau ◽

Jordi Salas-Salvadó ◽

...

Keyword(s):

Physical Activity ◽

Body Mass Index ◽

Body Mass ◽

Body Fat ◽

Controlled Trial ◽

High Sensitivity ◽

Linear Regression Models ◽

Mediating Role ◽

Inflammatory Score ◽

Inflammatory Profile

Abstract Background Mechanisms underlying the associations of high levels of physical activity (PA) and adherence to the Mediterranean diet (MedDiet) with a better inflammatory profile remain unclear. Our objective was to assess the mediating role of changes in body mass index (BMI) and waist circumference (WC), as markers of body fat in the association of changes in PA and adherence to the MedDiet, with changes in the inflammatory profile. Method This study included 489 adults, aged 55–75 years, from the PREDIMED-Plus multicenter lifestyle intervention trial. An inflammatory score was calculated, based on 8 blood biomarkers: high-sensitivity C-reactive protein, interleukin 6, interleukin 8, interleukin 18, monocyte chemo-attractant protein-1, C-peptide, leptin, and regulated on activation, normal T-cell–expressed and secreted chemokine. Biomarkers, levels of PA, score of MedDiet adherence, BMI, and WC were measured at baseline and at 1-year follow-up. Linear regression models were fitted according to the Baron and Kenny framework for mediation analysis. Results Changes in BMI and WC mediated the association of both changes in PA and changes in the MedDiet adherence with the inflammatory score. Body mass index mediated 26% of the association of changes in total PA with the inflammatory profile, and 27% of the association of changes in the MedDiet, while WC mediated 13% and 12% of these associations, respectively. Conclusion In older adults at high cardiovascular risk, increasing PA levels and adherence to a MedDiet during 1 year were associated with a lower inflammatory score, which was partly mediated by a reduction in body fat. Clinical Trials Registration Number International Standard Randomized Controlled Trial Number: ISRCTN89898870; registration date July 24, 2014, retrospectively registered.

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“I am going out!” – lifestyle sports and physical activity in adolescents

BMC Public Health ◽

10.1186/s12889-021-11066-3 ◽

2021 ◽

Vol 21 (1) ◽

Author(s):

K. Janeckova ◽

Z. Hamrik ◽

M. Matusova ◽

P. Badura

Keyword(s):

Physical Activity ◽

Socioeconomic Status ◽

Sedentary Behaviour ◽

Vigorous Physical Activity ◽

Sociodemographic Factors ◽

Linear Regression Models ◽

Great Opportunity ◽

Sport Activities ◽

Lifestyle Activities ◽

Out Of School

Abstract Background Lifestyle sport activities (e.g. parkour or skateboarding) are considered attractive and beneficial for a long-term commitment to physical activity (PA) and might be a great opportunity for adolescents who do not feel comfortable in an organized or competitive atmosphere. The purpose of the study was to assess whether participation in lifestyle activities is associated with moderate-to-vigorous physical activity (MVPA), out-of-school vigorous physical activity (VPA), and sedentary behaviour in adolescents aged 10–15 years, with major demographic variables (sex, age, socioeconomic status) being taken into account. Methods Data from a research project linked to the Health Behaviour in School-aged Children (HBSC) survey collected in 2017 in the Czech Republic was used. The sample consisted of 679 participants (303 of them girls) and was selected by quota sampling. Chi-square tests were used to assess differences in involvement in lifestyle activities according to sex, grade, and socioeconomic status. Ordinal and linear regression models were used to analyse the associations of participation in lifestyle activities and selected energy balance-related behaviours. Results Participation in lifestyle sport activities was significantly associated with a higher level of physical activity (MVPA and out-of-school VPA) after adjustment for sociodemographic factors, as was participation in organized sport. No significant associations were shown for sedentary behaviour. Conclusions Adolescents participating in lifestyle sport activities report being more physically active and, in case of doing multiple such activities concurrently, also spending less time sitting than their peers not involved in lifestyle sport activities. As such, lifestyle sport activities seem to represent a feasible way of increasing overall PA level in adolescent population.

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Physical Activity and Diet Quality Modify the Association between Comorbidity and Disability among Stroke Patients

Nutrients ◽

10.3390/nu13051641 ◽

2021 ◽

Vol 13 (5) ◽

pp. 1641

Author(s):

Lien T. K. Nguyen ◽

Binh N. Do ◽

Dinh N. Vu ◽

Khue M. Pham ◽

Manh-Tan Vu ◽

...

Keyword(s):

Physical Activity ◽

Diet Quality ◽

Negative Impact ◽

Cross Sectional Study ◽

World Health ◽

Short Version ◽

Linear Regression Models ◽

Stroke Patients ◽

Disability Score ◽

Cross Sectional

Background: Comorbidity is common and causes poor stroke outcomes. We aimed to examine the modifying impacts of physical activity (PA) and diet quality on the association between comorbidity and disability in stroke patients. Methods: A cross-sectional study was conducted on 951 stable stroke patients in Vietnam from December 2019 to December 2020. The survey questionnaires were administered to assess patients’ characteristics, clinical parameters (e.g., Charlson Comorbidity Index items), health-related behaviors (e.g., PA using the International Physical Activity Questionnaire- short version), health literacy, diet quality (using the Dietary Approaches to Stop Hypertension Quality (DASH-Q) questionnaire), and disability (using the World Health Organization Disability Assessment Schedule II (WHODAS II)). Linear regression models were used to analyze the associations and interactions. Results: The proportion of comorbidity was 49.9% (475/951). The scores of DASH-Q and WHODAS II were 29.2 ± 11.8, 32.3 ± 13.5, respectively. Patients with comorbidity had a higher score of disability (regression coefficient, B, 8.24; 95% confidence interval, 95%CI, 6.66, 9.83; p < 0.001) as compared with those without comorbidity. Patients with comorbidity and higher tertiles of PA (B, −4.65 to −5.48; p < 0.05), and a higher DASH-Q score (B, −0.32; p < 0.001) had a lower disability score, as compared with those without comorbidity and the lowest tertile of PA, and the lowest score of DASH-Q, respectively. Conclusions: Physical activity and diet quality significantly modified the negative impact of comorbidity on disability in stroke patients. Strategic approaches are required to promote physical activity and healthy diet which further improve stroke rehabilitation outcomes.

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Comparative analysis of reported physical activity from leisure centres’ members versus the general population in Spain

BMJ Open ◽

10.1136/bmjopen-2020-043963 ◽

2021 ◽

Vol 11 (6) ◽

pp. e043963

Author(s):

Jorge López Fernández ◽

Alejandro López-Valenciano ◽

Xián Mayo ◽

Elizabeth Horton ◽

Ivan Clavel ◽

...

Keyword(s):

Physical Activity ◽

General Population ◽

Spanish Population ◽

Moderate Intensity ◽

Short Version ◽

Lower Prevalence ◽

Metabolic Equivalent ◽

Outcomes Measures ◽

Gender And Age ◽

And Gender

Objectives(1) To describe the physical activity (PA) levels of the members of a Spanish leisure centre operator according to age and gender; (2) to describe the differences in the three PA levels between the members of a Spanish leisure centre operator and the general Spanish population considering the PA Eurobarometer data according to their gender and age and (3) to explore the intensity origin of the PA either in Spanish members of leisure centres or the Spanish population considering their gender.DesignDescriptive epidemiology study.ParticipantsData from 16 Spanish leisure centres (n=3627) and from the 2017 Eurobarometer 472 for Spain (n=1002) were used for this research.Primary and secondary outcomes measuresThe PA levels were analysed with the International Physical Activity Questionnaire short version, and respondents were grouped into physical inactivity (PIA), moderate-PA and high-PA. Moreover, gender (men or women) and age (18–29 years; 30–44 years; 45–59 years; 60–69 years; ≥70 years) were considered. Total metabolic equivalent (MET)-min/week, as well as total MET-min/week for walking intensity, moderate intensity and vigorous intensity were recorded.ResultsLeisure centres showed a lower prevalence of PIA and a higher prevalence of high-PA than the general population (p<0.05). Women displayed a higher prevalence of PIA and lower prevalence of high-PA than men (p<0.05). The prevalence of PIA increases with age while the prevalence of high-PA decreases.ConclusionLeisure centres engage most of their members in regular PA, including women and older adults, and these members also perform a higher number of MET in vigorous PA, than the general population.

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Validity, reliability, and calibration of the physical activity unit 7 item screener (PAU-7S) at population scale

International Journal of Behavioral Nutrition and Physical Activity ◽

10.1186/s12966-021-01169-w ◽

2021 ◽

Vol 18 (1) ◽

Author(s):

Helmut Schröder ◽

Isaac Subirana ◽

Julia Wärnberg ◽

María Medrano ◽

Marcela González-Gross ◽

...

Keyword(s):

Physical Activity ◽

Predictive Validity ◽

Internal Consistency ◽

Regression Models ◽

Weighted Kappa ◽

Linear Regression Models ◽

Retest Reliability ◽

Activity Unit ◽

Test Retest Reliability ◽

Acceptable Internal Consistency

Abstract Background Validation of self-reported tools, such as physical activity (PA) questionnaires, is crucial. The aim of this study was to determine test-retest reliability, internal consistency, and the concurrent, construct, and predictive validity of the short semi-quantitative Physical Activity Unit 7 item Screener (PAU-7S), using accelerometry as the reference measurement. The effect of linear calibration on PAU-7S validity was tested. Methods A randomized sample of 321 healthy children aged 8–16 years (149 boys, 172 girls) from the nationwide representative PASOS study completed the PAU-7S before and after wearing an accelerometer for at least 7 consecutive days. Weight, height, and waist circumference were measured. Cronbach alpha was calculated for internal consistency. Test-retest reliability was determined by intra-class correlation (ICC). Concurrent validity was assessed by ICC and Spearman correlation coefficient between moderate to vigorous PA (MVPA) derived by the PAU-7S and by accelerometer. Concordance between both methods was analyzed by absolute agreement, weighted kappa, and Bland-Altman statistics. Multiple linear regression models were fitted for construct validity and predictive validity was determined by leave-one-out cross-validation. Results The PAU-7S overestimated MVPA by 18%, compared to accelerometers (106.5 ± 77.0 vs 95.2 ± 33.2 min/day, respectively). A Cronbach alpha of 0.76 showed an acceptable internal consistency of the PAU-7S. Test-retest reliability was good (ICC 0.71 p < 0.001). Spearman correlation and ICC coefficients of MVPA derived by the PAU-7S and accelerometers increased from 0.31 to 0.62 and 0.20 to 0.62, respectively, after calibration of the PAU-7S. Between-methods concordance improved from a weighted kappa of 0.24 to 0.50 after calibration. A slight reduction in ICC, from 0.62 to 0.60, yielded good predictive validity. Multiple linear regression models showed an inverse association of MVPA with standardized body mass index (β − 0.162; p < 0.077) and waist to height ratio (β − 0.010; p < 0.014). All validity dimensions were somewhat stronger in boys compared to girls. Conclusion The PAU-7S shows a good test-retest reliability and acceptable internal consistency. All dimensions of validity increased from poor/fair to moderate/good after calibration. The PAU-7S is a valid instrument for measuring MVPA in children and adolescents. Trial registration Trial registration numberISRCTN34251612.

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Health and nutrition literacy in adults: Links with lifestyle factors and obesity

Mediterranean Journal of Nutrition and Metabolism ◽

10.3233/mnm-200471 ◽

2020 ◽

Vol 13 (4) ◽

pp. 361-370

Author(s):

Maria Michou ◽

Demosthenes B. Panagiotakos ◽

Christos Lionis ◽

Vassiliki Costarelli

Keyword(s):

Physical Activity ◽

Alcohol Consumption ◽

Linear Regression ◽

Smoking Status ◽

Linear Regression Analysis ◽

Cross Sectional Study ◽

Lifestyle Factors ◽

Linear Regression Models ◽

Chi Square ◽

Cross Sectional

BACKGROUND: Low Health Literacy (HL) and Nutrition Literacy (NL) are associated with serious negative health outcomes. OBJECTIVES: The aim of this study was to investigate certain lifestyle factors and obesity, in relation to HL and NL. METHODS: This cross-sectional study was conducted in the urban area of the Attica region, in Greece. The sample consisted of 1281 individuals, aged ≥18 years. HL, NL sociodemographic characteristics and lifestyle factors (physical activity, smoking status, alcohol consumption,) were assessed. Mann-Whitney U, the Kruskall Wallis, Pearson chi-square tests and multiple linear regression models were used. RESULTS: Linear regression analysis has shown that smoking, alcohol consumption and physical activity, were associated with HL levels (–1.573 points for ex-smokers in comparison to smokers, p = 0.035, –1.349 points for alcohol consumers in comparison to non-consumers, p = 0.006 and 1.544 points for physically active individuals to non-active, p = 0.001). With respect to NL levels, it was also not associated with any of these factors. Obesity was not associated with HL and NL levels. CONCLUSIONS: Certain lifestyle factors, including physical activity, are predicting factors of HL levels, in Greek adults. The results contribute to the understanding of the relationship between lifestyle factors and HL and should be taken into account when HL policies are designed.

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Physical Activity and the Risk of COVID-19 Infection and Mortality: A Nationwide Population-Based Case-Control Study

Journal of Clinical Medicine ◽

10.3390/jcm10071539 ◽

2021 ◽

Vol 10 (7) ◽

pp. 1539

Author(s):

Dong-Hyuk Cho ◽

Sun Ju Lee ◽

Sae Young Jae ◽

Woo Joo Kim ◽

Seong Jun Ha ◽

...

Keyword(s):

Physical Activity ◽

Lower Risk ◽

Population Based ◽

Control Group ◽

Metabolic Equivalent ◽

South Korean ◽

Public Health Screening ◽

Metabolic Equivalent Of Task ◽

Korean National Health Insurance ◽

Respiratory Coronavirus

Regular physical activity (PA) is known to reduce the risk of serious community-acquired infections. We examined the association of PA with the morbidity and mortality resulting from coronavirus disease (COVID-19) infection in the South Korean population. Patients who tested positive for severe acute respiratory coronavirus 2 and who underwent public health screening between 2014 and 2017 (n = 6288) were included. Age- and sex-matched controls (n = 125,772) were randomly selected from the Korean National Health Insurance Service database. Leisure-time PA was assessed using a self-reported questionnaire. The mean PA levels were lower in the patient than in the control group (558.2 ± 516.3 vs. 580.2 ± 525.7 metabolic equivalent of task (MET)-min/week, p = 0.001). Patients with moderate to vigorous PA (MVPA) were associated with a lower risk of COVID-19 morbidity (odds ratio (OR), 0.90; 95% confidence interval (CI), 0.86–0.95). In addition, a standard deviation (SD) increment in MET/week (525.3 MET-min/week) was associated with a 4% decrease in the risk of COVID-19 morbidity (OR, 0.96; 95% CI, 0.93–0.99). MVPA and an SD increment in MET/week were associated with lower mortality (MVPA: OR, 0.47; 95% CI, 0.26–0.87; per SD increment: OR, 0.65; 95% CI, 0.48–0.88). Higher levels of regular PA were associated with a lower risk of COVID-19 infection and mortality, highlighting the importance of maintaining appropriate levels of PA along with social distancing amid the COVID-19 pandemic.

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Isotonic quadriceps endurance is better associated with daily physical activity than quadriceps strength and power in COPD: an international multicentre cross-sectional trial

Scientific Reports ◽

10.1038/s41598-021-90758-7 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Erik Frykholm ◽

Sarah Gephine ◽

Didier Saey ◽

Arthur Lemson ◽

Peter Klijn ◽

...

Keyword(s):

Physical Activity ◽

Linear Regression ◽

Multiple Linear Regression ◽

Regression Models ◽

Sedentary Time ◽

Quadriceps Strength ◽

Linear Regression Models ◽

Cross Sectional ◽

Quadriceps Function ◽

Multiple Linear Regression Models

AbstractKnowledge about modifiable determinants of daily physical activity (PA) in patients with chronic obstructive pulmonary disease (COPD) is crucial to design effective PA interventions. The present study aimed to determine the contribution of quadriceps strength, power and endurance to daily PA in COPD. Additionally, for quadriceps endurance, we also aimed to determine to what extent the association varies according to the mode of movement (isotonic, isometric, or isokinetic). Using a multicentre cross-sectional trial design we determined the contribution of quadriceps function to daily PA (steps, sedentary time and time spent doing moderate-to-very-vigorous physical activity [MVPA]) using bivariate and partial Pearson correlation analysis (r) and multiple linear regression models (ΔR2). Pre-determined controlling factors were sex, age, body mass index (BMI), COPD-assessment test, forced expiratory volume in one second in percent of the predicted value (FEV1pred), and distance walked on the 6-minute walk test. Eighty-one patients with COPD (mean ± SD: age 67 ± 8 years, FEV1pred 57 ± 19%, daily steps 4968 ± 3319, daily sedentary time 1016 ± 305 min, and MVPA time 83 ± 45 min) were included. Small to moderate bivariate correlations (r = .225 to .452, p < .05) were found between quadriceps function and measures of PA. The best multiple linear regression models explained 38–49% of the variance in the data. Isotonic endurance was the only muscle contributor that improved all PA models; daily steps (ΔR2 = .04 [relative improvement 13%] p = .026), daily sedentary time (ΔR2 = .07 [23%], p = .005) and MVPA-minutes (ΔR2 = .08 [20%], p = .001). Isotonic endurance was also independently associated with most PA variables, even when controlling for strength, power or isometric-isokinetic endurance properties of the muscle (r = .246 to .384, p < .05). In contrast, neither strength, power, isometric-or isokinetic endurance properties of the muscle was independently associated with PA measures when controlling for isotonic endurance (r = .037 to .219, p > .05). To conclude, strength, power, and endurance properties of the quadriceps were low to moderately associated with PA in patients with COPD. Isotonic quadriceps endurance was the only quadriceps property that was independently associated with the different measures of PA after controlling for a basic set of known determinants of PA, quadriceps strength or power, or isometric or isokinetic quadriceps endurance. Future longitudinal studies should investigate its potential as a modifiable determinant of PA.

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Convergent Validity of a Piezoelectric Pedometer and an Omnidirectional Accelerometer for Measuring Children’s Physical Activity

Pediatric Exercise Science ◽

10.1123/pes.23.3.399 ◽

2011 ◽

Vol 23 (3) ◽

pp. 399-410 ◽

Cited By ~ 9

Author(s):

Scott Duncan ◽

Kate White ◽

Losi Sa’ulilo ◽

Grant Schofield

Keyword(s):

Physical Activity ◽

Convergent Validity ◽

Vigorous Physical Activity ◽

Limits Of Agreement ◽

Metabolic Equivalent ◽

Low Level ◽

School Day ◽

Level 3 ◽

Equivalent Test ◽

Children’S Physical Activity

The aim of this study was to assess the convergent validity of a new piezoelectric pedometer and an omnidirectional accelerometer for assessing children’s time spent in moderate to vigorous physical activity (MVPA). A total of 114 children (51 boys, 63 girls) aged 5–11 years wore a sealed NL-1000 piezoelectric pedometer (New Lifestyles Inc, Lee’s Summit, MO) and an Actical accelerometer (Mini Mitter, Bend, OR) over one school day. The NL-1000 pedometers were randomized to one of two manual intensity thresholds used to define MVPA (1): Level 3 = 2.9 metabolic equivalent test (MET) and (2) Level 4 = 3.6 MET. Compared with the Actical, the NL-1000 underestimated the time spent in MVPA by 37% and 45% at intensity levels 3 and 4, respectively. In addition, the 95% limits of agreement were wide at both intensity levels (level 3 = -144%, 70%; level 4 = -135%, 45%), indicating a low level of precision.

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