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1.
Nutrients ; 15(18)2023 Sep 09.
Artigo em Inglês | MEDLINE | ID: mdl-37764701

RESUMO

Prior research suggests that food security status may have an effect on the home food environment. Further, the literature suggests that food access factors may function to influence said relationship. The purpose of this research is to fill a gap in the literature on this relationship, as well as to identify potential food access effect modifiers. This research employs linear mixed effects modeling with a random intercept variable (zip codes). Eleven food access variables are included in regression analyses and are tested as potential effect modifiers in the association between food security status and the home food environment. Food security status is significantly associated with the home food environment (95% CI = 0.1-1.38) in the unadjusted model. In the adjusted model, food pantry usage is found to be a significant effect modifier on the association between food security status and the home food environment. This research concludes that food security status has a significant but disparate effect on the home food environment depending on participant food pantry usage. Practical implications from this research would be for relevant stakeholders to potentially improve rural food pantry access in order to increase the home food environment among rural and food insecure populations.


Assuntos
Alimentos , Nonoxinol , Humanos , South Carolina , Modelos Lineares , Segurança Alimentar
2.
Artigo em Inglês | MEDLINE | ID: mdl-37703141

RESUMO

Ultrasound (US) muscle image series can be used for peripheral human-machine interfacing based on global features, or even on the decomposition of US images into the contributions of individual motor units (MUs). With respect to state-of-the-art surface electromyography (sEMG), US provides higher spatial resolution and deeper penetration depth. However, the accuracy of current methods for direct US decomposition, even at low forces, is relatively poor. These methods are based on linear mathematical models of the contributions of MUs to US images. Here, we test the hypothesis of linearity by comparing the average velocity twitch profiles of MUs when varying the number of other concomitantly active units. We observe that the velocity twitch profile has a decreasing peak-to-peak amplitude when tracking the same target motor unit at progressively increasing contraction force levels, thus with an increasing number of concomitantly active units. This observation indicates non-linear factors in the generation model. Furthermore, we directly studied the impact of one MU on a neighboring MU, finding that the effect of one source on the other is not symmetrical and may be related to unit size. We conclude that a linear approximation is partly limiting the decomposition methods to decompose full velocity twitch trains from velocity images, highlighting the need for more advanced models and methods for US decomposition than those currently employed.


Assuntos
Ultrassonografia , Humanos , Eletromiografia , Modelos Lineares
3.
J Neural Eng ; 20(5)2023 Sep 26.
Artigo em Inglês | MEDLINE | ID: mdl-37750681

RESUMO

Objective.Transcranial direct current stimulation (tDCS) has been broadly used to modulate brain activity with both bipolar and high-definition montages. However, tDCS effects can be highly variable. In this work, we investigated whether the variability in the tDCS effects could be predicted by integrating individualized electric field modeling and individual pre-tDCS behavioral performance.Approach.Here, we first compared the effects of bipolar tDCS and 4 × 1 high-definition tDCS (HD-tDCS) with respect to the alleviation of visual crowding, which is the inability to identify targets in the presence of nearby flankers and considered to be an essential bottleneck of object recognition and visual awareness. We instructed subjects to perform an orientation discrimination task with both isolated and crowded targets in the periphery and measured their orientation discrimination thresholds before and after receiving 20 min of bipolar tDCS, 4 × 1 HD-tDCS, or sham stimulation over the visual cortex. Individual anatomically realistic head models were constructed to simulate tDCS-induced electric field distributions and quantify tDCS focality. Finally, a multiple linear regression model that used pre-tDCS behavioral performance and tDCS focality as factors was used to predict post-tDCS behavioral performance.Main results.We found that HD-tDCS, but not bipolar tDCS, could significantly alleviate visual crowding. Moreover, the variability in the tDCS effect could be reliably predicted by subjects' pre-tDCS behavioral performance and tDCS focality. This prediction model also performed well when generalized to other two tDCS protocols with a different electrode size or a different stimulation intensity.Significance.Our study links the variability in the tDCS-induced electric field and the pre-tDCS behavioral performance in a visual crowding task to the variability in post-tDCS performance. It provides a new approach to predicting individual tDCS effects and highlights the importance of understanding the factors that determine tDCS effectiveness while developing more robust protocols.


Assuntos
Estimulação Transcraniana por Corrente Contínua , Córtex Visual , Humanos , Eletrodos , Modelos Lineares , Percepção Visual
4.
Eur J Radiol ; 167: 111067, 2023 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-37659209

RESUMO

OBJECTIVES: To evaluate the performance of artificial intelligence (AI) software for automatic thoracic aortic diameter assessment in a heterogeneous cohort with low-dose, non-contrast chest computed tomography (CT). MATERIALS AND METHODS: Participants of the Imaging in Lifelines (ImaLife) study who underwent low-dose, non-contrast chest CT (August 2017-May 2022) were included using random samples of 80 participants <50y, ≥80y, and with thoracic aortic diameter ≥40 mm. AI-based aortic diameters at eight guideline compliant positions were compared with manual measurements. In 90 examinations (30 per group) diameters were reassessed for intra- and inter-reader variability, which was compared to discrepancy of the AI system using Bland-Altman analysis, paired samples t-testing and linear mixed models. RESULTS: We analyzed 240 participants (63 ± 16 years; 50 % men). AI evaluation failed in 11 cases due to incorrect segmentation (4.6 %), leaving 229 cases for analysis. No difference was found in aortic diameter between manual and automatic measurements (32.7 ± 6.4 mm vs 32.7 ± 6.0 mm, p = 0.70). Bland-Altman analysis yielded no systematic bias and a repeatability coefficient of 4.0 mm for AI. Mean discrepancy of AI (1.3 ± 1.6 mm) was comparable to inter-reader variability (1.4 ± 1.4 mm); only at the proximal aortic arch showed AI higher discrepancy (2.0 ± 1.8 mm vs 0.9 ± 0.9 mm, p < 0.001). No difference between AI discrepancy and inter-reader variability was found for any subgroup (all: p > 0.05). CONCLUSION: The AI software can accurately measure thoracic aortic diameters, with discrepancy to a human reader similar to inter-reader variability in a range from normal to dilated aortas.


Assuntos
Algoritmos , Inteligência Artificial , Masculino , Humanos , Feminino , Tomografia Computadorizada por Raios X , Software , Modelos Lineares
5.
Epilepsy Res ; 196: 107220, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37699282

RESUMO

AIM: Adherence to antiseizure medication is of great importance in achieving seizure control and maintaining well-being for people with epilepsy. Therefore, it is important to assess medication adherence and factors affecting medication adherence in this patient group. This study aims to examine the effects of concealment of epilepsy on medication adherence in people with epilepsy. METHOD: This cross-sectional study was conducted with 220 people with epilepsy. Data were collected using a patient information form, the Morisky Medication Adherence Scale-8 (MMAS-8), and the Concealment of Epilepsy Scale (CES) and analyzed using descriptive statistics and multiple linear regression analysis. RESULTS: The mean age of the participants was 49.84 ± 9.43 years, and 53.6% of them were male. Their mean MMAS-8 score was 4.25 ± 1.99%, and 72.3% had low medication adherence. Additionally, their mean CES score was 49.84 ± 9.43. The CES scores of the participants negatively predicted their MMAS-8 scores (p < 0.05), and medication adherence was positively predicted by female gender, the duration of diagnosis, the single administration of drugs per day, and employment status, whereas it was negatively predicted by the annual number of seizures (F=19.256, p < 0.001). CONCLUSION: In this study, people with epilepsy were found to have low medication adherence and a high tendency to conceal epilepsy. Furthermore, the tendency to conceal epilepsy had a negative effect on medication adherence. IMPLICATIONS: Psychosocial interventions aimed at reducing the tendency to conceal epilepsy can contribute to medication adherence in people with the condition.


Assuntos
Epilepsia , Humanos , Feminino , Masculino , Adulto , Pessoa de Meia-Idade , Estudos Transversais , Epilepsia/tratamento farmacológico , Convulsões , Modelos Lineares , Adesão à Medicação
6.
BMC Infect Dis ; 23(1): 622, 2023 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-37735372

RESUMO

BACKGROUND: Coronavirus disease 2019 (COVID-19) is a rapidly developing and sometimes lethal pulmonary disease. Accurately predicting COVID-19 mortality will facilitate optimal patient treatment and medical resource deployment, but the clinical practice still needs to address it. Both complete blood counts and cytokine levels were observed to be modified by COVID-19 infection. This study aimed to use inexpensive and easily accessible complete blood counts to build an accurate COVID-19 mortality prediction model. The cytokine fluctuations reflect the inflammatory storm induced by COVID-19, but their levels are not as commonly accessible as complete blood counts. Therefore, this study explored the possibility of predicting cytokine levels based on complete blood counts. METHODS: We used complete blood counts to predict cytokine levels. The predictive model includes an autoencoder, principal component analysis, and linear regression models. We used classifiers such as support vector machine and feature selection models such as adaptive boost to predict the mortality of COVID-19 patients. RESULTS: Complete blood counts and original cytokine levels reached the COVID-19 mortality classification area under the curve (AUC) values of 0.9678 and 0.9111, respectively, and the cytokine levels predicted by the feature set alone reached the classification AUC value of 0.9844. The predicted cytokine levels were more significantly associated with COVID-19 mortality than the original values. CONCLUSIONS: Integrating the predicted cytokine levels and complete blood counts improved a COVID-19 mortality prediction model using complete blood counts only. Both the cytokine level prediction models and the COVID-19 mortality prediction models are publicly available at http://www.healthinformaticslab.org/supp/resources.php .


Assuntos
COVID-19 , Humanos , Área Sob a Curva , Citocinas , Modelos Lineares , Análise de Componente Principal
7.
BMC Res Notes ; 16(1): 228, 2023 Sep 21.
Artigo em Inglês | MEDLINE | ID: mdl-37735411

RESUMO

The global rise in life expectancy transforms age structure consequently having impact to the sustainability of social protection systems and working life. This descriptive study aimed to illustrate the annual prevalence of sustainable working life across Swedish residential regions, and investigate differences between age groups, sex, or being identical or fraternal twin. The study sample included 81,231 twins with linkage to national register data on sickness absence, disability pension, unemployment, and residential regions. Regions were classified by Swedish municipalities into nine groups. Sustainable working life were then followed in 1998, 2003, 2008, and 2013. Annual prevalence and Generalized Estimating Equation (GEE) with log linear models for interaction test were used. Medium to large size municipalities (15-24%) had higher annual prevalence of sustainable working life than smaller municipalities (1-7%). Young adults in medium to large size municipalities had high annual prevalence of sustainable working life. We found no differences for sexes or being identical or fraternal twin. To conclude, annual prevalence of sustainable working life in 1998, 2003, 2008 and 2013 differed by region being highest in medium to large size municipalities which may have importance for targeting policies, regulations, and practices in a region-specific way. Further studies on residential regions and sustainable working life would be merited to confirm associations and other influential factors.


Assuntos
Pensões , Política Pública , Humanos , Adulto Jovem , Modelos Lineares , Prevalência , Suécia/epidemiologia , Masculino , Feminino
8.
J Gerontol Soc Work ; 66(7): 844-863, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37702990

RESUMO

This study examined the moderating mechanisms of generative concerns (perception of making contributions to others) between generative civic activities and mental health among middle-aged and older adults. A total of 1,109 community-dwelling adults aged over 45 were recruited through an online survey. Generative civic activities (political participation and volunteering), generative concerns (the Loyola Generativity Scale), and two outcomes of mental health (depressive symptoms and mental wellbeing) were measured. Linear regression models and simple slope analyses were used to probe the moderating effects of generative concerns, stratified by age (45-64 years and 65+). Generative activities, but not concerns, were associated with lower depressive symptoms among middle-aged and older adults. Generative concerns and activities were related to better mental wellbeing among middle-aged adults. Generative concerns moderated the associations between civic activities and depressive symptoms. Those with higher generative concerns but lower civic activities had higher depression scores. Conversely, a stronger reduction in depressive symptoms by engaging in civic activities was found only when individuals had greater concerns. No moderating effect was found on mental wellbeing. The positive effect of civic engagement on reducing depressive symptoms depends on generative concerns, particularly among older people and those with greater concerns. Bridging the gap between perceived generative concerns and actual civic actions may improve later-life mental health.


Assuntos
Vida Independente , Saúde Mental , Humanos , Pessoa de Meia-Idade , Idoso , Modelos Lineares , Voluntários
9.
Clin Nutr ESPEN ; 57: 272-280, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37739668

RESUMO

BACKGROUND & AIM: The impact of cardiovascular disease attributable to trans fatty acids (TFAs) in the Brazilian population has not been systematically evaluated. This study aims to analyze the burden of ischemic heart disease (IHD) attributable to TFAs in Brazil between 1990 and 2019. METHODS: Data from the Global Burden of Disease Study 2019 were used to investigate the attributable burden in Brazil and its 27 federative units, for both sexes-pooled adults aged ≥25 years. Mortality and disability-adjusted life years (DALYs) from IHD attributable to TFAs were expressed as crude and age-standardized rates and differences from 1990 to 2019 by percentage and annualized rate of change. Linear regression was used to investigate trends. National voluntary and regulatory policies for industrial TFAs (iTFAs) implemented until 2019, summary exposure value (SEV) and sociodemographic index (SDI) were examined. RESULTS: Between 1990 and 2019, crude and age-standardized mortality rates from IHD attributable to TFAs decreased by -15.9% and -58.0%, respectively, in Brazil. A decrease in crude (-23.3%) and age-standardized (-56.4%) DALY rates of IHD attributable to TFAs was also noticed in the country. States of the South, Southeast, and the Federal District had the largest declines of IHD attributable to TFAs, while states of the Northeast and North had the smallest or even an increase. The policies already adopted had little effect on the IHD burden. A lower SEV and higher SDI value seemed to reduce the burden of IHD. CONCLUSIONS: Although a downward trend in IHD attributable to TFAs and a reduction in exposure to TFAs were observed, this burden is still relevant in Brazil, reinforcing the importance of diet policies, such as banning iTFAs.


Assuntos
Doenças Cardiovasculares , Isquemia Miocárdica , Ácidos Graxos trans , Adulto , Feminino , Masculino , Humanos , Ácidos Graxos trans/efeitos adversos , Isquemia Miocárdica/epidemiologia , Brasil/epidemiologia , Modelos Lineares
10.
Clin Nutr ESPEN ; 57: 331-336, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37739676

RESUMO

INTRODUCTION: Nutritional deficiency, especially malnutrition, is frequent in cancer patients and is associated with changes in body composition, such as low muscle mass. Phase angle (PhA) has been used as a prognostic indicator and may be related to nutritional status, functionality, and quality of life in these patients. The objectives of this study were to assess the effect of chemotherapy treatment on PhA values, comparing the PhA variation before and after treatment, and to evaluate the PhA correlation, as a muscle mass surrogate, with the physical domain of quality of life, functionality, and nutritional risk in a sample of patients with cancer. METHODS: A longitudinal study was conducted in patients with cancer undergoing chemotherapy for the first time. All patients aged 18 years or older, newly diagnosed, and undergoing chemotherapy for the first time were included. To analyze the difference in the PhA means according to the different classification variables, the t-test - or ANOVA - was used. The variation of the final and initial PhA was evaluated through the linear regression test. RESULTS: A total of 175 patients were analyzed, of which 66.3% were female. The mean PhA of the initial assessment was significantly higher when compared to the final assessment of the patients PhA (p = 0.018). In both the initial and final assessments, PhA was correlated with the physical domain (r = 0.29; p < 0.001 and r = 0.19; p = 0.021) and with the functionality score (r = - 0.32; p < 0.001 and r = - 0.30; p < 0.001) and total PG-SGA (r = - 0.31; p < 0.001 and r = - 0.23; p = 0.006). CONCLUSION: PhA can be considered a predictor of physical quality of life and functionality in cancer patients receiving chemotherapy treatment.


Assuntos
Desnutrição , Neoplasias , Humanos , Feminino , Masculino , Qualidade de Vida , Estudos Longitudinais , Neoplasias/tratamento farmacológico , Composição Corporal , Modelos Lineares
11.
Clin Nutr ESPEN ; 57: 613-616, 2023 10.
Artigo em Inglês | MEDLINE | ID: mdl-37739713

RESUMO

BACKGROUND: Estimating body mass index (BMI) in hospitalised patients for nutritional assessment is challenging when measurement of weight and height is not feasible. The study aimed to validate a previously published regression equation to predict BMI using mid-upper arm circumference (MUAC). We also evaluated the proposed global MUAC cut-off of ≤24 cm to detect undernutrition. METHODS: We measured standing height, weight, and MUAC prospectively in a sample of stable patients. Agreement between calculated and predicted BMI was evaluated using Bland-Altman analysis. RESULTS: We studied 201 patients; 102 (51%) were male. Median (IQR age was 42 (29-50) years. 95% limits of agreement between predicted and calculated BMI were +0.6767 to +1.712 and the bias was +1.076. MUAC ≤24 cm was 97% sensitive and 83% specific to detect undernutrition. CONCLUSION: BMI derived from MUAC had poor calibration for estimating actual BMI. However, low MUAC has good discriminative accuracy to detect undernutrition.


Assuntos
Braço , Desnutrição , Humanos , Masculino , Adulto , Pessoa de Meia-Idade , Feminino , Índice de Massa Corporal , Modelos Lineares , Estatura , Desnutrição/diagnóstico
12.
Trop Anim Health Prod ; 55(5): 319, 2023 Sep 23.
Artigo em Inglês | MEDLINE | ID: mdl-37740795

RESUMO

Access to simple, accurate feed intake models would facilitate decision-making in feedlots as feed costs are a major part of operational expenditure. This study aimed to develop genotype-specific feed intake models for South African feedlot lambs. Four ram and four ewe lambs each of eight genotypes were raised under ideal growth conditions from weaning until 1 year of age. Feed intake and growth were monitored throughout this period. The intake data were then used to fit various models to predict daily feed intake, intake as percentage of body weight, cumulative intake and feed conversion ratio. No satisfactory univariate models could be found for the prediction of daily or percentage intake, but a good fit was found for cumulative intake data (R2 >0.80, P <0.01). The slope parameters of these linear models show a strong correlation (72%) with feed conversion and can therefore also serve as proxies for feed conversion. A model was also developed that can predict feed conversion ratio with a moderate accuracy (R2 =0.5, P <0.05) at a given body weight. The cumulative intake model was deemed accurate and simple enough for practical use.


Assuntos
Ingestão de Alimentos , Feminino , Animais , Ovinos/genética , Masculino , Desmame , Peso Corporal , Genótipo , Modelos Lineares
13.
JASA Express Lett ; 3(9)2023 09 01.
Artigo em Inglês | MEDLINE | ID: mdl-37671987

RESUMO

Evaluating any model underlying the control of speech requires segmenting the continuous flow of speech effectors into sequences of movements. A virtually universal practice in this segmentation is to use a velocity-based threshold which identifies a movement onset or offset as the time at which the velocity of the relevant effector breaches some threshold percentage of the maximal velocity. Depending on the threshold choice, more or less of the movement's trajectory is left in for model regression. This paper makes explicit how the choice of this threshold modulates the regression performance of a dynamical model hypothesized to govern speech movements.


Assuntos
Antígenos do Grupo Sanguíneo de Lewis , Movimento , Modelos Lineares , Fala
14.
Environ Monit Assess ; 195(10): 1158, 2023 Sep 06.
Artigo em Inglês | MEDLINE | ID: mdl-37673826

RESUMO

Identifying groundwater contamination sources and supervising groundwater quality conditions are urgently needed to protect the groundwater resources of coastal areas like Contai of India, as communities here are heavily relying on groundwater which deteriorates progressively. So current research aims to address in detail about origins and influencing factors of groundwater contamination, status, and monitoring water quality by employing extremely useful leading technologies like principal component and factor analyses (PCA/FA), groundwater quality index (GWQI), and multiple linear regression (MLR) that helps to simplify complicated works instead of the conventional methods. Eight groundwater quality parameters were evaluated here, such as pH, TH (total hardness), Tur (turbidity), EC (electrical conductivity), TDS (total dissolved solids), Mn (manganese), Fe (iron), and Cl (chloride) for 38 sites. Three principal components with ~ 81% of the total variance were extracted from the PCA/FA analysis. The origin of maximum loadings of each factor is identified as a result of saline water, disintegration and leaching process, organic or else biogenic activities, and lithogenic or otherwise non-lithogenic links through percolating water. GWQI results show that ~ 87% of the samples fall into the good category and ~ 13% of the samples fall into the poor to very poor category. A model consisting of Tur, Fe, EC, Mn, TH, and Cl as independent parameters is more feasible and is proposed to predict GWQI obtained from MLR analysis. This MLR model also suggests that turbidity with the highest beta coefficient (0.820) is a key contributor relative to the entire groundwater class in this affected area. The findings relating to this research may support the designer and officials in monitoring and protecting coastal groundwater resources like selected areas.


Assuntos
Monitoramento Ambiental , Água Subterrânea , Modelos Lineares , Análise de Componente Principal , Cloretos , Índia , Ferro
15.
Psychol Sport Exerc ; 65: 102373, 2023 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37665826

RESUMO

This study aimed at investigating (1) the cognitive and motor predictors of divergent movement ability (DMA) in childhood and (2) the role of sport and enriched physical education (PE) experience. Participants were 165 fifth graders, aged 10-11 years, with different histories (onset and duration) of participation in enriched PE. They were assessed in cognitive/attentional and motor/sport skills and active play/sport habits at baseline, and six months later in DMA. Results of regression analyses showed an overall prediction of DMA by sport practice and a nuanced prediction of individual DMA indices (fluency, flexibility, originality) by decision making and spatial attention ability. Linear mixed models revealed better DMA in children exposed to enriched PE, with differential effects on DMA indices depending on its duration and earlier/later onset. The results identify novel cognitive determinants of children's DMA and suggest that sport practice and experience of designed enrichment in PE may benefit DMA.


Assuntos
Cognição , Hábitos , Humanos , Criança , Estudos Cross-Over , Modelos Lineares , Destreza Motora
16.
Environ Monit Assess ; 195(10): 1172, 2023 Sep 08.
Artigo em Inglês | MEDLINE | ID: mdl-37682362

RESUMO

Landfilling is the least preferred method in the hierarchy of solid waste management options, but it is the most widely practiced option. Thus, identification of environmentally and economically suitable landfill sites should be of prime importance. The main objective of this study is to identify environmentally and economically suitable landfill sites using fuzzy analytical hierarchy process-based weighted linear combination model within a GIS environment. This study also used the DRASTIC-based groundwater vulnerability index and distance of landfills from densely populated areas to protect groundwater and reduce cost of transportation of solid waste which were not considered by the previous studies. Using the previously reported methods, a total of 132 landfill sites were found environmentally suitable in the study area. But, after applying DRASTIC-based groundwater vulnerability index, the number of environmentally suitable sites reduced to 95. When the proximity of the 95 sites to densely populated areas was considered to reduce waste transportation cost, the number of selected sites further reduced to 21 site and they can be considered the most environmentally and economically suitable landfill sites. This study will help the policy makers and the concerned SWM authorities to construct the engineered landfills at environmentally and economically suitable landfill sites in the study area and in other similar areas.


Assuntos
Monitoramento Ambiental , Água Subterrânea , Índia , Modelos Lineares , Resíduos Sólidos
17.
J Strength Cond Res ; 37(10): 1963-1968, 2023 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-37729511

RESUMO

ABSTRACT: Larsen, F, Loturco, I, Sigvaldsen, E, Strand, MF, Kalhovde, JM, and Haugen, T. Reliability and validity of different lower-limb strength tests to determine 1RM in the Keiser A300 leg press. J Strength Cond Res 37(10): 1963-1968, 2023-The aim of this study was to explore the reliability and validity of different lower-limb strength tests to determine the one-repetition maximum (1RM) value in the Keiser A300 leg press. Twenty-eight recreationally active subjects performed load-velocity (L-V) relationship, 1RM, isometric midthigh pull (IMTP), and maximal repetitions to failure (MRF) tests on 3 separated sessions. Predicted 1RMs for the L-V relationship were estimated from a linear regression equation, correlating movement velocity and relative loads. The number of repetitions from the MRF tests (at loads relative to bodyweight) and peak force from the IMTP tests were used in regression equations to predict 1RM. The level of significance was set to ρ ≤ 0.05. All 1RM prediction methods were highly comparable with the traditional 1RM test, as only trivial and nonsignificant differences were observed. Furthermore, the L-V relationship was the most reliable (intraclass correlation coefficient [± 95% confidence interval] = 0.99 [0.98, 0.996]; effect size = -0.01 [-0.38, 0.36], standard error of the measurement = 6.4 kg; coefficient of variation = 3.0 [2.2-3.8]% and valid (r = 0.95 [0.89, 0.98], effect size = 0.08 [-0.29, 0.45], standard error of the estimate = 20.4 kg; coefficient of variation = 7.4 [5.5-9.3]%) when compared with direct 1RM measurements. The L-V relationship test showed a significant change score relationship (r = 0.41 [0.04, 0.68]) against the direct 1RM measurements. In conclusion, the tests used in this study cannot be used interchangeably, but they represent a good alternative in training settings where 1RM testing is not feasible.


Assuntos
Perna (Membro) , Humanos , Reprodutibilidade dos Testes , Peso Corporal , Correlação de Dados , Modelos Lineares
18.
Trop Anim Health Prod ; 55(5): 306, 2023 Sep 20.
Artigo em Inglês | MEDLINE | ID: mdl-37731026

RESUMO

The main objective of the study was to confirm whether a specific and constant interrelationship exists between total erythrocyte count (TEC) and hemoglobin (Hb) concentration in Cholistani cattle blood and to navigate the potential of TEC for estimating Hb level in Cholistani cattle (n = 264) grouped as per gender (males, n = 122; females, n = 142) and age (young, n = 140; adults, n = 124). The TEC and Hb (HbD) estimation was carried out through veterinary hematology analyzer. The Hb was also calculated as TEC × 3 and was termed as HbC. Linear regression was implied, and accordingly, scatterplots were drawn between TEC, HbD, HbC, and corrected Hb (CHB). The regression prediction equation hence attained was used to deduce corrected hemoglobin (CHb). A significant (P ≤ 0.05) difference was noticed between HbD and HbC. A non-significant (P ≥ 0.05) difference was noticed, however, between HbD and CHb. Tests of level of agreement indicated a higher Cronbach's alpha and intraclass correlation coefficient (0.682 for average measures) for HbD and CHb as compared to that for HbD and HbC (0.559 for average measures). A convention of Hb concentration as three times of TEC (× 3) is not valid for Cholistani cattle. A different pen-side hematological formula, i.e., Hb (g/dL) = 0.66(TEC) + 6.1, however, provides a better estimate of Hb from the TEC in cattle blood. Using hemocytometry for TEC in the field, all the stakeholders associated with veterinary research, academics, and practice may benefit from this formula in resource-poor countries.


Assuntos
Hemoglobinas , Feminino , Masculino , Bovinos , Animais , Contagem de Eritrócitos/veterinária , Modelos Lineares
19.
Math Biosci Eng ; 20(8): 14395-14413, 2023 06 30.
Artigo em Inglês | MEDLINE | ID: mdl-37679141

RESUMO

A dose-effect relationship analysis of traditional Chinese Medicine (TCM) is crucial to the modernization of TCM. However, due to the complex and nonlinear nature of TCM data, such as multicollinearity, it can be challenging to conduct a dose-effect relationship analysis. Partial least squares can be applied to multicollinearity data, but its internally extracted principal components cannot adequately express the nonlinear characteristics of TCM data. To address this issue, this paper proposes an analytical model based on a deep Boltzmann machine (DBM) and partial least squares. The model uses the DBM to extract nonlinear features from the feature space, replaces the components in partial least squares, and performs a multiple linear regression. Ultimately, this model is suitable for analyzing the dose-effect relationship of TCM. The model was evaluated using experimental data from Ma Xing Shi Gan Decoction and datasets from the UCI Machine Learning Repository. The experimental results demonstrate that the prediction accuracy of the model based on the DBM and partial least squares method is on average 10% higher than that of existing methods.


Assuntos
Aprendizado de Máquina , Medicina Tradicional Chinesa , Análise dos Mínimos Quadrados , Modelos Lineares
20.
BMC Public Health ; 23(1): 1754, 2023 09 09.
Artigo em Inglês | MEDLINE | ID: mdl-37684584

RESUMO

BACKGROUND: A non-negligible proportion of children grow up with problematic alcohol use in the family. Problematic familial drinking can be regarded as a stressor, and prior studies have consistently reported poorer mental health among adolescents who are exposed. However, it is also of relevance to identify modifiable protective factors which may buffer against stress-related ill-health in this group of adolescents. One context where such factors may be present is the school. The aim of this study is to examine the relationship between perceived problematic familial alcohol use and students' stress-related complaints, and specifically to explore if the school's degree of student focus can buffer against any such negative health consequences of problem drinking at home. METHODS: Data were drawn from four separate surveys, the Stockholm School Survey (SSS) and the Stockholm Teacher Survey (STS) conducted in 2014 and 2016 among 7,944 students (~ 15-16 years) and 2,024 teachers in 147 Stockholm senior-level school units. Perceived problematic familial alcohol use was measured by one item in the SSS. Stress-related complaints were captured by co-occurring somatic complaints and psychological distress, and reported by students in the SSS. The school's student focus was measured by an index based on teachers' ratings of four items in the STS. A set of covariates at the student and the school level were also included. Two-level binary logistic and linear regression models were performed. RESULTS: Perceived problematic familial alcohol use was linked with an increased likelihood of reporting co-occurring somatic complaints as well as psychological distress. Cross-level interactions revealed that the association between perceived problematic familial alcohol use and co-occurring somatic complaints was weaker among students attending schools with stronger teacher-rated student focus. Regarding psychological distress, the association was weaker for students attending schools with intermediate or strong teacher-rated student focus, compared with those attending schools with weaker teacher-rated student focus. CONCLUSIONS: The findings provide support for the assumption that favourable conditions in schools can buffer against negative health consequences of problematic conditions in the family, thus serving a compensatory role.


Assuntos
Alcoolismo , Criança , Humanos , Adolescente , Modelos Lineares , Probabilidade , Instituições Acadêmicas , Estudantes
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