RESUMO
CONTEXT: Excessive dynamic lower limb misalignment may predispose ballet dancers to jump-related injuries. However, it is unknown whether proximal and distal factors influence this movement pattern. The aim of this study was to investigate whether hip abduction strength, foot alignment, and ankle dorsiflexion range of motion (ROM) are associated with peak angles of hip adduction and internal rotation and knee abduction during the preparation and landing phases of a classical ballet jump. DESIGN: Cross-sectional study. METHODS: Forty-one healthy amateur ballet dancers were included. Hip abduction strength was evaluated isometrically using a handheld dynamometer, foot alignment was determined by the shank-forefoot alignment, and weight-bearing ankle dorsiflexion ROM was measured by performing the lunge test. Peak hip and knee angles were analyzed 3-dimensionally during the preparation and landing phases of a single-leg jump. A Pearson correlation matrix was used to investigate the association of hip abduction strength, shank-forefoot alignment, and ankle dorsiflexion ROM with peak angles of hip adduction and internal rotation and knee abduction during the preparation and landing phases of the jump. RESULTS: Greater hip abduction strength was associated with greater peak hip internal rotation angle (r = .43, P < .05), but not with peak hip adduction and knee abduction angles during the preparation phase of the jump. There were no associations of shank-forefoot alignment and ankle dorsiflexion ROM with peak hip and knee angles during the preparation (r = -.23 to .36, P > .05) and landing (r = -.20 to .24, P > .05) phases of the jump. There was no association of hip abduction strength with peak hip and knee angles during the landing phase of the jump (r = -.28 to .16, P > .05). CONCLUSION: Hip abductors strengthening, correction of foot misalignments, and increasing ankle dorsiflexion ROM may not prevent excessive hip and knee movements during a classical ballet single-leg jump in amateur dancers.
Assuntos
Articulação do Tornozelo , Dança , Humanos , Fenômenos Biomecânicos , Estudos Transversais , Extremidade Inferior , Articulação do Joelho , Movimento , Amplitude de Movimento ArticularRESUMO
PURPOSE: Low physical capacity is hypothesized to be associated with the presence of musculoskeletal symptoms. Therefore, our aim was to investigate whether physical capacity is associated with the presence of musculoskeletal symptoms in the neck, shoulders, and thoracic and lumbar spine among office workers. METHODS: Sixty-seven office workers, recruited at the university, were evaluated regarding the presence of musculoskeletal symptoms through the Nordic Musculoskeletal Questionnaire (NMQ). Measurements of muscle strength and endurance of shoulder abduction, endurance of trunk flexion and extension, and back and leg flexibility were obtained. Data were analysed through a binomial logistic regression model, considering physical capacity as the independent variable and symptoms as the dependent variable. An adjusted model was also applied that controlled for individual and occupational covariates. RESULTS: The basic model showed a significant association between reduced shoulder abduction strength and neck (OR: 0.87; 95% CI 0.78-0.98) and shoulder symptoms (OR: 0.88; 95% CI 0.78-0.99), and between reduced back and leg flexibility and thoracic spine symptoms (OR: 0.92; 95% CI 0.85-0.99). The adjusted model, after controlling for the covariates, demonstrated that reduced shoulder abduction strength (OR: 0.70; 95% CI 0.52-0.94) and reduced back and leg flexibility (OR: 0.81; 95% CI 0.66-0.99) were associated, instead, with the occurrence of neck and low back symptoms, respectively, in the last 12 months. CONCLUSIONS: Physical capacity is associated with the presence of neck and low back symptoms in office workers. Furthermore, individual and occupational characteristics affect the relationship between physical capacity and musculoskeletal symptoms and should be considered for understanding and managing musculoskeletal symptoms among office workers.