Factorial analysis of the Brazilian-Portuguese version of the Work Ability Index, reproducibility and validity of the single item and the short version for online application.

BACKGROUND: The Work Ability Index (WAI) assesses work demands, health status, and physical and mental resources. OBJECTIVES: To evaluate the measurement properties of the WAI, single-item work ability score (WAS), and short version for online applications. METHODS: One hundred three workers completed the 3 versions of the WAI and the Perceived Stress Scale (PSS-10) questionnaire. The reproducibility and construct validity of the 3 versions of the WAI and their concurrent validity with the PSS-10 were tested. Statistical tests were performed with IBM® SPSS 28.0. RESULTS: The test-retest reliability of the WAI, WAS, and WAI short version ranged from good to excellent. The WAI and WAI short version showed excellent internal consistency. The construct validity of the WAS was moderate and positive and it was excellent and positive for the WAI short version. Concurrent validity of the WAI, WAS, and WAI short version was moderate and negative, and item mental resources were strong and negative. Factor analysis reached an acceptable level for all indexes (≥ 0.90). The analysis with two factors reached an acceptable level for all indexes (≥ 0.90) and was the best model. CONCLUSION: The reliability and construct and concurrent validity of the various versions of the WAI were strong to excellent in online applications. Confirmatory factor analysis demonstrated a new grouping of items for the WAI Brazilian version. However, it is necessary to be careful in the choice due to the distribution model of items in health domains and aspects of work.

Instruments to Assess Evidence-Based Practice Among Health Care Professionals: A Systematic Review.

BACKGROUND: The use of measurement instruments to assess the use of Evidence-Based Practice by health professionals has been frequently reported in studies. AIMS: This systematic review aimed to summarize, describe, and evaluate the measurement properties of the instruments that evaluate the use of Evidence-Based Practice in health professionals. METHODS: The search was carried out in four databases considering three groups of search terms: evidence-based practice, evaluation, and measurement proprieties. Studies were included that described the use of instruments to assess Evidence-Based Practice in health professionals, with the full-text publication, which analyzed the measurement properties, in English. The methodological quality of the studies was evaluated using COnsensus-based Standards for the selection of health Measurement INstruments. RESULTS: In total, 6,429 were found and only 92 were eligible for data analysis. Forty new instruments were identified most were developed for nursing and physical therapist. The investigators performed at least 1 type of validity test on 73% of the instruments. Reliability was tested at 90%, through internal consistency. Responsiveness was tested on less than half of the instruments (30%). Most of the instruments identified are reliable and valid to measure evidence-based practice in health professionals. CONCLUSION: Although the Fresno Test remains the most complete instrument, and adequate for use. The COnsensus-based Standards for the selection of health Measurement INstruments checklist classified 7 (seven) instruments as suitable for the target audience.

Prevalence and factors associated with low back pain in warehouse workers: A cross-sectional study.

BACKGROUND: Low back pain is a highly prevalent musculoskeletal disorder that leads to functional incapacity and absence from work. OBJECTIVE: To analyze warehouse workers' prevalence and factors associated with low back pain. METHODS: Cross-sectional study design with 204 male warehouse workers (stocker, separator, checker, and packer) from motor parts companies. Age, body mass, marital status, education, the practice of physical exercise, presence of pain, low back pain intensity, comorbidities, time away from work, handgrip strength, flexibility, and trunk muscle strength were collected and analyzed. Data are presented as mean, standard deviation, absolute and relative frequency. A binary logistic regression was performed, with low back pain (yes or no) as the dependent variable. RESULTS: 24.0% of the workers reported low back pain with an average intensity of 4.7 (± 2.4) points. The participants were young, had completed high school education, were single and married, and had normal body weight. There was a more likely low back pain presence in separator tasks. Greater handgrip strength in the dominant (right) hand and trunk muscle is associated with no low back pain. CONCLUSION: Low back pain prevalence was 24% among young warehouse workers, more likely in separation tasks. A greater handgrip and trunk strength can be a protective factor to no low back pain.

Quality assessment of smartphone fitness apps used to increase physical activity level and improve general health in adults: A systematic review.

Introduction: Mobile exercise apps for smartphones have been used with intervention measures to increase physical activity. This study aimed to identify and evaluate the quality of fitness apps for smartphones that were used to increase the level of physical activity and improve the overall health of healthy adults. Methods: The systematic review was performed in five electronic databases EMBASE, MEDLINE, CINAHL, Academic Research Premier e Cochrane Reviews, and Trials. The search terms were grouped into three categories according to the principles of population, intervention, comparison, and outcomes. The following includes examples of the group terms: population (healthy adults), intervention (smartphone apps), and outcomes (physical activity level). Results: Of the 3924 potential articles, 74 were read for full-text analysis. Only seven studies were included in the review. The methodological evaluation of the studies and the apps' quality showed that only one study and one app were evaluated with good quality. All studies used a type of application to improve the level of physical activity (measured by the number of daily steps), reporting an increase and improvement in some general health indices (calorie expenditure, weight, BMI) in healthy adults, regardless of frequency and duration of intervention and applications. Conclusion: We cannot say that the use of smartphone applications improves the level of physical activity and general health. The low methodological quality of the studies and the possibility to evaluate the applications used (Mars Scale) due to the lack of technical standardization presented in the studies, despite the app used showing positive results in all studies.

Characterization of the procedures and professional practices of primary care physiotherapists in Brazil.

BACKGROUND: Physiotherapy interventions are well known and established in secondary and tertiary care. However, within the Brazilian primary health care (PHC), the role of physiotherapists is still under development, and there is a lack of representative data showing how and what is being implemented by these professionals. OBJECTIVE: The aim was to characterize the professional practices of physiotherapists working at PHC in Brazil. METHODS: This is an exploratory study that adopted a descriptive analysis based on the records of physiotherapists, considering assistance and sociodemographic aspects, in the period from 2016 to 2017. The following variables were extracted: region, federative unit and municipality, age group and sex of the attended user, condition/problem, procedure and place of attendance. RESULTS: A total of 318,780 procedures were recorded, concentrated in the South and southeast regions, with a predominance of clinical-assistance procedures and a higher frequency of attendance in Basic Health Units. Among the assisted users, the female gender prevailed in the age group of 20 to 59 years. Low back pain was the most frequently treated condition. CONCLUSION: The professional practices of physiotherapists working at PHC in Brazil were characterized by healthcare, clinical-assistance, preventive and health promotion activities, with emphasis on clinical-assistance practices focused on musculoskeletal conditions, especially low back pain.

The non-explicit observational method is reproducible and valid in the analysis of occupational biomechanical exposure of workers.

BACKGROUND: An analysis of workers' exposure to biomechanical risk factors in the workplace with a high methodological quality allows for stronger evidence of the relationship between risk factors and musculoskeletal disorders. OBJECTIVE: To evaluate the measurement properties of non-explicit observational methods. METHODS: Psychometric study design that included 50 workers in an analysis of occupational tasks (n = 50 video tasks) using a non-explicit observational method, the Rapid Entire Body Assessment (REBA) method, and a workers' self-report on their perception of their biomechanical occupational exposure. The reliability was tested by a non-explicit method and the REBA method. The validity of the non-explicit method was tested using the REBA method and the workers' self-report, according to COSMIN guidelines. RESULTS: The intra- and inter-evaluator reliability of the non-explicit observational method ranged from moderate to strong (ICC2.1  = 0.45 to 0.87), and the agreement was acceptable (SEM = 0.60 to 2.79), expect for neck region. The REBA method showed intra-evaluator reliability to be moderate to excellent (ICC2.1  = 0.50 to 1.00), inter-evaluator reliability to be poor to strong (ICC2.1  = -0.17 to 0.83), and intra- and inter-evaluator agreement to be poor to moderate (SEM = 0.00 to 0.74). The concurrent validity between the non-explicit and REBA methods showed a strong positive correlation. CONCLUSION: The non-explicit observational method of biomechanical exposure analysis presented reproducible and valid measurement properties. Methods that present better measurement properties provide professionals with a better basis for analysis and assist in decision-making to reduce or eliminate risk exposure.

Adaptação transcultural para o português brasileiro e propriedades de medida de questionários de função sexual para mulheres: revisão sistemática / Adaptación transcultural al portugués brasileño y propiedades de medición de los cuestionarios de función sexual femenina: una revisión sistemática / Cross-cultural adaptation for Brazilian Portuguese and measurement properties of sexual function questionnaires for women: a systematic review

RESUMO O objetivo deste estudo é elencar os questionários utilizados para avaliar a função sexual feminina, bem como analisar o processo de adaptação transcultural para o português brasileiro e as propriedades de medida testadas. Para tanto, foram realizadas buscas nas bases de dados PubMed, Embase, CINAHL e LILACS, usando palavras em inglês, português e espanhol. A partir dessas buscas, foram extraídos dados sobre a tradução, a adaptação transcultural e as propriedades de medida de cada questionário elegível de acordo com os critérios de inclusão. As propriedades de medida relatadas nas publicações foram analisadas por dois avaliadores usando o checklist do COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN). Um total de 46.987 estudos foi encontrado, dos quais 131 artigos foram analisados integralmente, e apenas 12 foram incluídos na amostra. Foram encontrados sete instrumentos de avaliação da função sexual feminina, e apenas três tiveram suas propriedades psicométricas avaliadas como boas, sendo o Female Sexual Function Index o instrumento mais validado para diferentes populações clínicas. Conclui-se que existe a necessidade de aprimoramento das versões validadas de instrumentos de detecção de disfunção sexual para a população feminina durante todo o seu ciclo de vida.

RESUMEN El objetivo de este estudio es enumerar los cuestionarios utilizados en la evaluación de la función sexual femenina, así como analizar el proceso de adaptación transcultural al portugués brasileño y las propiedades de medición probadas. Para ello, se realizaron búsquedas en las bases de datos PubMed, Embase, CINAHL y LILACS, utilizando términos en inglés, portugués y español. Estas búsquedas resultaron en datos sobre traducción, adaptación transcultural y propiedades de medición de cada cuestionario elegible bajo los criterios de inclusión. Las propiedades de medición informadas en las publicaciones fueron analizadas por dos evaluadores utilizando la lista de verificación de COnsensus-based Standards for the selection of health Measurement INstruments (COSMIN). Del total de 46.987 estudios encontrados, se analizó 131 artículos de manera completa y se incluyó solo 12 en la muestra. Se encontraron siete instrumentos de evaluación de la función sexual femenina, pero solo tres tuvieron sus propiedades psicométricas consideradas como adecuadas; y el Índice de Función Sexual Femenina es el instrumento más validado para diferentes poblaciones clínicas. Se concluye que es necesario mejorar las versiones validadas de instrumentos para evaluar la disfunción sexual femenina a lo largo de todo su ciclo de vida.

ABSTRACT This article aims to list questionnaires used to assess female sexual function, as well as to analyze the cross-cultural adaptation process for Brazilian Portuguese and the measurement properties tested. Search strategies were performed in the PubMed, Embase, CINAHL and LILACS databases, using words in English, Portuguese, and Spanish. Based on the inclusion criteria, data about the translation, cross-cultural adaptation, and measurement properties of each eligible questionnaire were extracted. The measurement properties reported were evaluated by two evaluators using the Consensus-based Standards for the Selection of Health Measurement Instruments (COSMIN) checklist. The search returned a total of 46,987 studies, of which 131 were read in full, and only 12 were included in the review. Of the seven instruments that assess female sexual function found only three had their psychometric properties evaluated as good, with the Female Sexual Function Index (FSFI) being the most validated instrument for different clinical populations. There is a need to improve the validated versions of sexual dysfunction assessment instruments for the female population throughout their life cycle.

Does tutors' support contribute to a telehealth program that aims to promote the quality of life of office workers? A cluster randomized controlled trial.

The quality of life in the workplace can be achieved by creating a place more humanized and strategies that provide wellness to workers. The aim of this study was to investigate the effectiveness of telehealth education program to promote quality of life of office workers.This is a cluster randomized controlled trial (RCT). The participants were office workers computer users (n = 326). All received 9 audiovisual content (grouped into topics: musculoskeletal health, healthy diet, and mental health) that addresses the real needs identified by them in the focus groups. The intervention group (n = 178) was instructed to seek the tutor support about topics addressed by the audiovisual content. The primary outcome measure was quality of life by WHOQOL-BREF. The secondary outcome measure was level of physical activity of the participants. Data analysis was performed by General Linear Mixed Model. After six months of telehealth education program a general improvement in health and environmental domain, was observed in the intervention group. During that period, a within-group analysis showed that there was a significant improvement in the intervention group, with respect to quality of life in general health (p < 0.05) and in the environmental domain (p < 0.01).In the baseline to the eighth month, there were statistically significant changes within-group for the general health (p < 0.05) and for the physical domain (p < 0.01) in both groups (p < 0.01). Telehealth education program promoted an improvement in the participants' quality of life. There was no benefit in favor of the telehealth education program, with tutor support in relation to the conventional program. TRIAL REGISTRATION: The trial was prospectively registered at ClinicalTrial.gov (NCT02980237). The date of registration was August 23, 2016.

Factor structure and short version of the modified Fresno test to assess the use of the evidence-based practice in physiotherapists.

BACKGROUND: The Modified Fresno Test has been used to evaluate the use of the Evidence-Based Physiotherapy (EBP). So far, none of the versions of the Fresno Test were subjected to analysis of the factorial structure. The objective of the study was to describe the exploratory and confirmatory factor structure of the Modified Fresno Test adapted to the Portuguese-Brazilian and analyze the statistical feasibility for the elaboration of a short version. METHODS: The questionnaire was applied with a convenience sample of 57 physiotherapists, being 36 professionals (13 of these also professors) and 21 students from the last semester of the physiotherapy course. Exploratory Factor Analysis (EFA) was performed by the method of principal components. Confirmatory Factor Analysis (CFA) was performed by the method of maximum likelihood. The total score of the answers in the test and retest was evaluated, totalling 228 observations. Reliability was assessed by means of internal consistency, using Cronbach's alpha coefficient. RESULTS: Reliability was satisfactory (α 0.81) for all questions of the instrument. The coefficient α calculated for the corrected item-total showed values higher than 0.20 except for item 9. Preliminary tests for Exploratory Factor Analysis showed acceptable values with Kaiser-Meyer-Olkin (KMO = 0.80) and Bartlett's test of sphericity [chi-square (78) = 1149.615, p < 0.001], indicating that the correlations were sufficient for analysis. The analysis revealed the presence of 3 factors (eigenvalues> 1), which explains 60.9% of the instrument's total variance. In Confirmatory Factor Analysis, none of the indices came close to an acceptable level (≥ 0.90), however, the second model which tested a three-factor structure provided a better fit to the data. From the results of this study the Modified Fresno Test short version was drawn. CONCLUSION: The analysis showed good factor validity and adequate internal consistency for the use of the instrument consisting of 13 questions and 3 factors. This model proved to be better than the original model. The short version consisting of 9 questions may be an appropriate alternative for use in the population of interest.

An ergonomics educational training program to prevent work-related musculoskeletal disorders to novice and experienced workers in the poultry processing industry: A quasi-experimental study.

This quasi-experimental study was conducted in a poultry processing industry with the aim of assessing the benefits of ergonomics educational training for novice and experienced workers in preventing work-related musculoskeletal disorders. Sociodemographic and occupational questionnaires were used to evaluate age, marital status, education, time in job, musculoskeletal complaints and pain intensity, perceived effort, biomechanical exposure, and perception of ease or difficulty in adoption of ergonomics educational training. Musculoskeletal complaints in the neck, back, and wrists were reduced with training, but pain intensity was reduced only in the wrist region. A reduction in the occupational biomechanical exposure from the baseline to immediately post-training and 2 months after training both for novice and experienced workers was also observed. The novice workers group differed from the experienced workers by presenting a higher reduction of biomechanical exposure in the cutting room. All workers in this study benefited from the ergonomics educational training in the short and medium term. However, the success of training was highly dependent on the content and approach of the training.

Occupational health and ergonomics physiotherapists in Brazil: investigation of the socio-demographic profile and professional practices.

Background: Occupational health and ergonomics (OHE) has been recognized as a Physiotherapy specialty in 15 countries; however, a lack of studies that provide profiles of OHE Physiotherapists (PTs) and their professional practices.Objective: To provides a profile of the OHE PTs in Brazil, identify and audit their current professional practices based on the Conselho Federal de Fisioterapia e Terapia Ocupacional (COFFITO) guidelines for this specialty.Method: This was a cross-sectional study. The participants were legally registered with the Regional Council of Physiotherapy and Occupational Therapy (CREFITO) in Brazil. An invitation to participate in the survey was sent to the members of the Association of Physiotherapists in Occupational Health and Ergonomics (ABRAFIT) and PTs recognized for their contributions to the OHE field. The participants were contacted through e-mail, Facebook posts, and LinkedIn messages. The questionnaire was distributed through the SurveyMonkey platform.Results: A total of 153 (86%) OHE PTs returned the survey. The mean age was 35.6 (SD 6.8) years, mean time in the OHE field was 8.5 (SD 5.6) years, the majority are women (61.5%). The OHE PTs were company employees or service providers. The OHE PTs reported satisfaction with their professional performance (74.8%). The OHE PTs' most frequent interventions include biomechanical exposure assessments, ergonomic workplace analysis, and occupational health management.Conclusion: The OHE PTs in Brazil are predominantly women with professional experience who earn higher salaries than other PTs specialties. The OHE PTs based on their audited practices within the COFFITO guidelines focus on ergonomic workplace analysis and biomechanical exposure assessment.

Are blue-collar workers more physically active than white-collar at work?

This study evaluates the physical activity level at work and leisure time of white-collar and two groups of blue-collar workers from the latex glove industry and the association of physical activity level and musculoskeletal complains and work ability. The workers' sociodemographic and behavioral health characteristics, work ability index, musculoskeletal complains, total step count and caloric expenditure for three consecutive days, were assessed. The blue-collar workers that move most from the workstation (longD) were more physically active at work compared to white-collar and blue-collar that moved close the workstation (shortD). But in leisure-time the result is reversed, white-collar and blue-collar groups were significantly more active. There was no association between physical activity level and musculoskeletal pain intensity and work ability. All the groups of workers exhibited satisfactory physical activity levels, but only blue-collar (longD) were more physically active (10,000 steps per day).

Effectiveness of a progressive resistance exercise program for industrial workers during breaks on perceived fatigue control: a cluster randomized controlled trial.

BACKGROUND: There is strong evidence that physical exercise in the workplace is effective for reducing workers' musculoskeletal complaints. Studies with industrial workers and studies on progressive resistance exercises during breaks are scarce. Our aim was to evaluate the effects of a resistance exercise program on perceived fatigue control among industrial workers. METHODS: 204 employees from the dairy industry were allocated to two groups, the intervention group (IG) (n = 98) and the control group (CG) (n = 106). The primary outcome measures were perceived fatigue control and maximum muscle strength, measured through the Need for Recovery Scale and one-repetition maximum contraction (1-RM), respectively. Secondary outcome measures were musculoskeletal complaints, physical activity level, perceived risk factors, physical fitness (BMI, vital signs, and body fat percentage), and workers´ productivity. All outcomes were assessed at baseline and then again after 4 months. The IG performed resistance exercises using progressively greater loads while the CG performed general exercise using elastic bands. The exercise protocols were performed three times per week for 20 min. An intention-to-treat analysis was performed using the mixed linear model. Results were considered significant when p < 0.05. RESULTS: The IG did not show to be superior to the CG, although both groups improved perceived fatigue control and muscle strength after the resistance physical exercise program in the worplace. There was also no significant difference between the groups for musculoskeletal complaints and other secondary variables analyzed. However, both groups showed significant improvements between baseline and after 4 months of intervention for all evaluated outcomes (p < 0.05). CONCLUSION: The implementation of a progressive resistance exercise program during work breaks for perceived fatigue control was no more effective than exercises using elastic bands. However, resistance exercises during work breaks presented better results on all measured outcomes regardless of the exercise protocol used. TRIAL REGISTRATION: U.S. National Institutes of Health, ClinicalTrials.gov Identifier: NCT02172053. Registered 19 June 2014.

Can Kinesio Taping® influence the electromyographic signal intensity of trunk extensor muscles in patients with chronic low back pain? A randomized controlled trial.

BACKGROUND: The evidence of the influence of Kinesio Taping® in changing electromyographic signal intensity of the lumbar musculature in patients with chronic non-specific low back pain (LBP) is very sparse. OBJECTIVES: To evaluate if Kinesio Taping® changes the electromyographic signal intensity of the longissimus and iliocostalis muscles in patients with chronic non-specific LBP. METHODS: Prospectively registered, three-arm randomized controlled trial with a blinded assessor. Patients were randomly allocated to the following interventions: 1) Kinesio Taping® Group (n=21), where patients received the tape according to the manufacturer's manual; 2) Placebo Group (i.e. normal surgical tape) (n=21); and 3) Non-treatment control Group (n=21). Assessments were performed at baseline, immediately after, and 30min after the intervention. The primary outcome was muscle activity of the iliocostalis and longissimus muscles as measured by surface electromyography. The secondary outcome was pain intensity (measured with a 0-10 Numerical Rating Scale). The effects of treatment were calculated using linear mixed models. RESULTS: A total of 63 patients were recruited. Follow up rate was high (98.4%). Patients were mostly women with moderate levels of pain and disability. Kinesio Taping® was better than the control and placebo groups in only 4 of 96 statistical comparisons, likely reflective of type I error due to multiple comparisons. No statistically significant differences were identified for the immediate reduction in pain intensity between groups. CONCLUSION: Kinesio Taping® did not change the electromyographic signal intensity of the longissimus and iliocostalis muscles or reduce pain intensity in patients with chronic low back pain. Clinicaltrials.gov: NCT02759757 (https://clinicaltrials.gov/ct2/show/NCT02759757).

Development of an e-health education program at the workplace using formative research - Technologies for improving quality of life.

BACKGROUND: e-Learning, a means by which to expand people's access to information can be effective in promoting health in the workplace. This study to present steps in the development of an e-health education program at the workplace. OBJECTIVE: This study aimed to present all steps of develop a telehealth education program for computer users using formative research to identify themes to health education for workers. METHODS: A team of expert conducted focus groups with administrative workers (n = 36 participants) to identify thematic health to the development of program. Three meetings were audio video recorded, and notes. All data were based on constant analysis, classical content analysis and keywords in-context. RESULTS: The content of the nine audio videos included four musculoskeletal health topics (Walking Program, Back School, Muscle Relaxation Techniques, and Work-related Musculoskeletal Diseases); three to healthy diet (Eating and Commensality, Ultra-processed Food and Food labeling, and Oil and Fat); two to mental health (Burnout Syndrome and the Meaning of work). CONCLUSION: The proposed steps in the development of a workplace e-health education program were successfully achieved. The engagement of the workers' staged focus groups was fundamental to the choice of themes relevant to the population in question.

Predictive factors for progression through the difficulty levels of Pilates exercises in patients with low back pain: a secondary analysis of a randomized controlled trial.

BACKGROUND: The progression through the difficulty levels of Pilates exercises is a subjective criterion, that depends on the therapist's experience and ability to identify the best moment to progress to the next level. OBJECTIVE: To identify the factors that interfere in the progression through the difficulty levels of the Pilates exercises in patients with chronic nonspecific low back pain. METHODS: Data from 139 patients with chronic nonspecific low back pain from a randomized controlled trial were used for statistical analysis using binary logistic regression. The dependent variable was the progression through the difficulty levels, and the independent variables were age, gender, educational level, low back pain duration, pain intensity, general disability, kinesiophobia, previous physical activity, and number of absences. RESULTS: The factors that interfered in the progression through the difficulty levels were previous physical inactivity (odds ratio [OR]=5.14, 95% confidence interval [CI]: 1.53-17.31), low educational level (OR=2.62, 95% CI: 1.12-6.10), more advanced age (OR=0.95, 95% CI: 0.92-0.98) and more absences (OR=0.63, 95% CI: 0.50-0.79). These variables explain 41% of the non-progression through the difficulty level of the exercises. CONCLUSION: Physical inactivity, low educational level, more advanced age and greater number of absences can be interfering factors in the progression through the difficulty levels of the Pilates exercises in patients with chronic nonspecific low back pain.

Electromyographic activity of the erector spinae: The short-effect of one workday for welders with nonspecific chronic low back pain, an observational study.

OBJECTIVE: This study aimed to evaluate the effect of one workday on pain and perceived exertion, muscular strength, and electromyographic activity of the erector spinae muscles in welders with and without low back pain. This is an observational cohort study. PARTICIPANTS: Twenty-two welders, metallurgical shipbuilding, were equally divided into 2 groups: low back pain and no low back pain. Pain and perceived exertion. Muscular strength by maximal voluntary contractions and electromyographic activity of right and left erector spinae muscles during maximal voluntary contractions and in the 3 welding positions for 2 periods of the workday (in the morning and at the end of the workday). RESULTS: At the end of workday, the pain increased significantly for the low back pain group (t(22) = 2.448; P= 0.023). The perceived exertion also increased significantly for both groups at the end of workday groups (F(1,22) = 8.570, P= 0.000) and periods (F(1,22) = 8.142, P= 0.000). There were no significant differences between groups and workday periods for muscular strength and electromyographic activity during maximal voluntary contractions of the erector spinae. There was no significance difference for electromyographic activity between groups and workday period and in the 3 welding positions. CONCLUSION: Although the pain and perceived exertion increased at the end of the workday, these results did not interfere in muscular strength and electromyographic activity of right and left erector spinae muscles. Thus, we can conclude that welders with chronic low back pain had a good physical capacity (muscular strength) and that muscle performance was maintained.

The influence of a real job on upper limb performance in motor skill tests: which abilities are transferred?

To investigate whether the specificities of real jobs create distinctions in the performance of workers in different motor tests for the upper limbs, 24 participants were divided into two groups according to their specific job: fine and repetitive tasks and general tasks. Both groups reproduced tasks related to aiming movements, handling and strength of the upper limbs. There were no significant differences between groups in the dexterity and performance of aiming movements. However, the general tasks group had higher grip strength than the repetitive tasks group, demonstrating differences according to job specificity. The results suggest that a particular motor skill in a specific job cannot improve performance in other tasks with the same motor requirements. The transfer of the fine and gross motor skills from previous experience in a job-specific task is the basis for allocating training and guidance to workers.

Reliability, Construct Validity and Interpretability of the Brazilian version of the Rapid Upper Limb Assessment (RULA) and Strain Index (SI).

BACKGROUND: There are very few observational methods for analysis of biomechanical exposure available in Brazilian-Portuguese. OBJECTIVE: This study aimed to cross-culturally adapt and test the measurement properties of the Rapid Upper Limb Assessment (RULA) and Strain Index (SI). METHODS: The cross-cultural adaptation and measurement properties test were established according to Beaton et al. and COSMIN guidelines, respectively. Several tasks that required static posture and/or repetitive motion of upper limbs were evaluated (n>100). RESULTS: The intra-raters' reliability for the RULA ranged from poor to almost perfect (k: 0.00-0.93), and SI from poor to excellent (ICC2.1: 0.05-0.99). The inter-raters' reliability was very poor for RULA (k: -0.12 to 0.13) and ranged from very poor to moderate for SI (ICC2.1: 0.00-0.53). The agreement was good for RULA (75-100% intra-raters, and 42.24-100% inter-raters) and to SI (EPM: -1.03% to 1.97%; intra-raters, and -0.17% to 1.51% inter-raters). The internal consistency was appropriate for RULA (α=0.88), and low for SI (α=0.65). Moderate construct validity were observed between RULA and SI, in wrist/hand-wrist posture (rho: 0.61) and strength/intensity of exertion (rho: 0.39). CONCLUSION: The adapted versions of the RULA and SI presented semantic and cultural equivalence for the Brazilian Portuguese. The RULA and SI had reliability estimates ranged from very poor to almost perfect. The internal consistency for RULA was better than the SI. The correlation between methods was moderate only of muscle request/movement repetition. Previous training is mandatory to use of observations methods for biomechanical exposure assessment, although it does not guarantee good reproducibility of these measures.