Physical, functional and personal variables affecting shoulder complaints in healthcare workers.

BACKGROUND: Work-related shoulder disorders adversely affect the quality of life and lead to increased costs related to decreased productivity and injury treatment. Therefore, understanding the relationship between strength, upper extremity function and work ability contributes to the development of interventions aimed to improve the well-being of healthcare workers. OBJECTIVE: Correlate shoulder abduction and handgrip strength with upper extremity function and work ability in healthcare workers with shoulder complaints. METHODS: 67 workers with shoulder pain in the last year were assessed by Disability of Arm, Shoulder and Hand (QuickDASH), Work Ability Index (WAI), isokinetic shoulder strength and isometric handgrip strength dynamometers. Data were analysed with Spearman's Correlation Coefficient (ρ= 0.05), SPSS 20.0 ®. RESULTS: 52% males, mean age 48.4 years, 42% physically active, most administrative and general services workers. Low correlation between handgrip strength and QuickDASH (r=-0.359; p = 0.004); low correlation between handgrip strength and WAI (r = 0.359; p = 0.003) and between shoulder abduction strength and the QuickDASH (r = -0.267; p = 0.049); no significant correlation between shoulder abduction strength and WAI (r = 0.001; p = 0.997). CONCLUSIONS: Handgrip and shoulder abduction strength were inversely associated with upper extremity dysfunction. Shoulder abduction strength was associated with work ability. The inclusion of strength assessment in workers is important to guide strategies to prevent musculoskeletal disorders.

Association between muscle strength, upper extremity fatigue resistance, work ability and upper extremity dysfunction in a sample of workers at a tertiary hospital.

BACKGROUND: Upper extremity musculoskeletal disorders negatively affect ability to perform activities of daily living, self-care and work. Therefore, outcome measurements that address muscle strength, fatigue resistance, functionality and work physical capacity must be defined to assess and plan specific actions to minimize them. OBJECTIVE: To investigate the association of upper extremity muscle strength with upper extremity fatigue resistance, work ability and upper extremity dysfunction in a sample of workers from a tertiary hospital. METHODS: Shoulder and elbow isokinetic strength were assessed by Biodex System 4™, isometric hand grip by JAMAR™, upper extremity fatigue resistance by Functional Impairment Test Hand and Neck/Shoulder/Arm (FIT-HaNSA), ability to work by the Work Ability Index and upper extremity dysfunction by the Quick-Disabilities of the Arm, Shoulder and Hand QuickDASH-Br questionnaire. The Nordic questionnaire and Numeric Pain Rating Scale (NPRS) were used for pain description. The associations were analysed by Spearman's correlation coefficient (rho) (p < 0.05). RESULTS: Twenty-seven participants: 59.2% women; mean age 46 years old; 70.3% obese/overweight; 62.9% active with predominantly dynamic muscle contraction work. Besides predominance of good to moderate work ability (81.4%) and comorbidities (37%), all participants had symptoms of the upper extremities for at least 12 months, with a predominance of low-intensity in the shoulder (55.5%). In addition, 88.8% reported pain in other segments. Muscle strength of abduction (rho = 0.49), adduction (rho = 0.40), internal rotation (rho = 0.44) and hand grip (rho = 0.68) presented moderate correlation with FIT-HaNSA. Hand grip (rho = - 0.52) showed moderate correlation with upper extremity dysfunction. CONCLUSIONS: The results of this preliminary study suggested the association of shoulder strength with fatigue resistance. Also, hand grip strength was associated with upper extremity dysfunction and fatigue resistance. No association was found with the Work Ability Index in this sample. So, it is suggested that hand grip and shoulder strength could be outcome measurements used for future interventions focused on upper extremity preventive exercises to improve strength and fatigue resistance of workers at risk for the development of musculoskeletal disorders. Other individual, psychosocial and organizational risk factors must also be considered as influences on upper extremity function.

Validade de construto do Functional Impairment Test-Hand and Neck/Shoulder and Arm (FIT-HANSA) para trabalhadores com queixas no membro superior de um hospital terciário / Construct validity of the Functional Impairment Test-Hand and Neck/Shoulder and Arm (FIT-HANSA) for workers with upper limb complaints of a tertiary hospital

O Functional Impairment Test-Hand and Neck/Shoulder/Arm (FIT-HaNSA) é um instrumento que avalia a resistência à fadiga e o desempenho do membro superior por meio de funções motoras grossas comumente utilizadas no dia a dia. Objetivo: Analisar a validade de construto do FIT-HaNSA em trabalhadores com sintomas no membro superior, por meio da correlação entre a resistência à fadiga do segmento com os escores de força muscular do ombro, cotovelo e mão, com a capacidade para o trabalho (ICT) e com a disfunção do membro superior (QUICK DASH-Br). Métodos: Trinta e nove trabalhadores de um hospital terciário com idade média de 42,9 anos (DP13,29) foram recrutados. Os instrumentos de medida Isocinético Biodex System 4 Pro™, dinamômetro de preensão palmar JAMAR®, QuickDASH-Br e ICT foram aplicados e correlacionados com o FIT-HaNSA. O Coeficiente de Correlação de Pearson (r) foi utilizado para quantificar a associação entre os instrumentos. Resultados: O FIT-HaNSA apresentou de fraca a moderada correlação entre a força muscular do ombro, cotovelo e mão (r= 0,18 ­ 0,58), porém significativas para ombro e mão. A associação entre o FIT-HaNSA com o QuickDASH-Br e ICT se mostraram fracas (r= -0,38 e 0,21). Conclusão: Nosso estudo forneceu evidências preliminares com relação às relações esperadas e validade do FIT-HaNSA como instrumento de medida para a avaliação da fadiga e desconforto em trabalhadores com queixas no membro superior

The Functional Impairment Test-Hand and Neck/Shoulder/Arm (FIT-HaNSA) is an instrument that assesses fatigue resistance and upper limb performance through thick motor functions commonly used in everyday life. Objective: To analyze the construct validity of the FIT-HaNSA in workers with symptoms in the upper limb, through the correlation between the fatigue resistance of the segment with the muscle strength scores of the shoulder, elbow and hand, with the ability to work (ICT) and with upper limb dysfunction (QUICK DASH-Br). Methods: Thirty-nine workers from a tertiary hospital with an average age of 42.9 years (SD13.29) were recruited. The Biodex System 4 Pro ™ isokinetic measurement instruments, JAMAR® handgrip dynamometer, QuickDASH-Br and ICT were applied and correlated with FIT-HaNSA. Pearson's correlation coefficient (r) was used to quantify the association between the instruments. Results: FIT-HaNSA showed a weak to moderate correlation between the muscular strength of the shoulder, elbow and hand (r= 0.18 - 0.58), but significant for the shoulder and hand. The association between FIT-HaNSA with QuickDASH-Br and ICT was weak (r= -0.38 and 0.21). Conclusion: Our study provided preliminary evidence regarding the expected relationships and validity of FIT-HaNSA as a measurement tool for the assessment of fatigue and discomfort in workers with complaints in the upper limb