RESUMO

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.

Assuntos

RESUMO

BACKGROUND: Fatigue is a multifactorial condition that leads to disease and loss in production, and it affects a large number of workers worldwide. This study aims to demonstrate a resistance exercise protocol that individuals will perform during the work schedule, and to evaluate the effectiveness of this exercises program for fatigue control. METHODS/DESIGN: This is a cluster randomized controlled trial with two arms and is assessor blinded. A total of 352 workers of both sexes, aged 18-65 years, from a medium-sized dairy plant were enrolled in this study. Participants will be recruited from 13 production sectors according to the eligibility criteria and will be randomized by clusters to either the Progressive Resistance Exercise (PRE) intervention group or the Compensatory Workplace Exercise (CWE) comparative group. A resistance exercise program will be implemented for both groups. The groups will receive instructions on self-management, breaks, adjustments to workstations, and the benefits of physical exercise. The PRE group will perform resistance exercises with gradual loads in an exercise room, and the CWE group will perform exercise at their workstations using elastic bands. The exercise sessions will be held 3 times a week for 20 min. The primary outcome measures will be symptoms of physical and mental fatigue, and muscular fatigue based on a one-repetition maximum (1RM). The secondary outcome measures will be level of physical activity, musculoskeletal symptoms, physical condition, perceived exposure, and productivity. The workers will be assessed at baseline and after a 4-month program. A linear mixed model will be applied on an intention-to-treat basis. DISCUSSION: This intervention is expected to reduce symptoms of fatigue in the workers. The exercise program is indicating in the workplace, although there are few studies describing the effects of exercise on the control of fatigue in the workplace. Emphasis will be placed on adherence to the program, which may result in significant and clinically important reductions in fatigue. It is also expected that the findings of this study will contribute significantly to the decision-making capacity of professionals working in the field of occupational health. TRIAL REGISTRATION: U.S. National Institutes of Health, ClinicalTrials.gov Identifier: NCT02172053 . Date registered 19 June 2014.

Assuntos

RESUMO

No jiu-jítsu predominam técnicas de luta sobre a imposição da força bruta e, juntamente com os princípios biomecânicos, otimiza a força muscular do lutador, anula a do oponente e utiliza as valências físicas deste contra ele próprio. Desse modo, buscou-se identificar a ocorrência de lesões de punho e mão e análise da dor em praticantes de jiu-jítsu. Esta é uma pesquisa de campo, descritiva, de análise quali-quantitativa, com 6 participantes avaliados em sua preensão palmar, goniometria de punho, além dos testes de Phalen e Finkelstein e aplicação da Escala Visual Analógica, diagrama corporal e questionário de McGill (Br-MPQ). Foram identificados 4 testes de Phalen positivos, 2 positivos para Finkelstein e 2 praticantes não apresentaram lesão. Ao analisar a força de preensão palmar da amostra, observou-se uma média de 54,83 ± 6,85 para a mão direita, e de 52,83 ± 6,01 para a esquerda. Já na goniometria 100% dos praticantes apresentaram alterações em um ou mais movimentos avaliados da articulação de punho. Ao avaliar a classificação da dor, verificou-se que os praticantes de jiu-jítsu referiram dor em duas ou mais regiões do corpo.

Jiu-jitsu fighting techniques are characterized by the imposition of brute force which, coupled to bio-mechanical principles, optimizes the fighter´s muscular strength, vanquishes the opponent and uses the physical valences of the former against himself. Current analysis identifies the occurrence of wrist and hand lesions and analyzes pain in jiu-jitsu practitioners. Current field, descriptive and qualitative-quantitative research was undertaken with 6 participants evaluated through hand pressure, wrist goniometry, Phalen and Finkelstein test and the application of the Analogic Visual Scale, body diagram and McGill questionnaire (Br-MPQ). Four Phalen tests were positive; two Finkelstein tests were positive and two practitioners did not manifest any lesion. The sample´s hand-palm pressure force revealed an average of 54.83±6.85 for the right hand and 52.83±6.01 for the left hand. All practitioners had alterations in one or more movements of the wrist articulations. Assessment of pain showed that jiu-jitsu practitioners indicated pain in two or more body regions.

Assuntos