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Índice de assimetria bilateral na tarefa SIT-TO-STAND em adultos jovens e saudáveis
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Introdução: O Sit-to-Stand (STS) constitui uma tarefa funcional quotidiana fundamental para a autonomia. Pela sua relevância na vida diária, a avaliação do movimento durante o STS constitui uma ferramenta útil de avaliação funcional, sobretudo quando analisado com recurso a instrumentos que fornecem indicadores biomecânicos quantitativos como o Índice de Assimetria, permitindo inferir sobre a qualidade do movimento. Apesar da relevância atribuída na literatura a este indicador, a sua caracterização em populações específicas carece de investigação.
Objetivos: Caracterizar o índice de assimetria bilateral (IA) na distribuição de carga entre membros inferiores e no deslocamento do centro de pressão (CoP) ao longo das fases e subfases do STS em adultos jovens saudáveis, e avaliar a sua relação com fatores individuais.
Metodologia: Foi realizado um estudo observacional, descritivo-analítico e transversal, no qual participaram 54 adultos jovens saudáveis com uma mediana de 23 anos e intervalo interquartis de 6. Foram analisadas a magnitude do IA para as forças de reação do solo (FRS) e do deslocamento do CoP, com recurso a três plataformas de forças (modelos FP4060-08 e FP4060-10), durante as diferentes fases e subfases da tarefa STS. Foram utilizados para a análise os valores da média e o coeficiente de variação (CV) do IA. Foi ainda avaliada a relação dos fatores sexo, IMC, nível de atividade física e direção da assimetria com o IA, com recurso à correlação de Spearman e modelos de regressão linear múltipla.
Resultados: A magnitude do IA variou entre 5-12% nas FRS e 6-13% no deslocamento do CoP, globalmente. A análise detalhada por fases e subfases revelou valores de assimetria superiores e diferenças estatisticamente significativas, principalmente nas subfases da tarefa cuja exigência biomecânica era superior. No que diz respeito ao CV, os valores variaram entre 36 e 75%, tendo sido observadas menos diferenças significativas entre fases. Foram identificadas correlações de fraca magnitude entre os determinantes IMC e nível de atividade física e os valores da magnitude do IA em fases específicas da tarefa, tendo os modelos de regressão linear múltipla revelado uma capacidade explicativa limitada (R² < 0,1).
Conclusão: Os resultados demonstraram que adultos jovens saudáveis apresentam um grau de assimetria variável ao longo da execução do STS com um CV elevado entre repetições, reforçando a pertinência de uma análise faseada da tarefa. A identificação de valores consistentes de assimetria permite estabelecer valores de referência para esta população, fundamentais para futuras comparações com populações clínicas. Adicionalmente, a deteção de diferenças estatisticamente significativas entre fases e subfases evidencia o potencial do STS como ferramenta sensível na caracterização do desempenho motor. Por outro lado, os fatores individuais analisados revelaram apenas uma associação limitada e com pouca significância estatística com o IA.
Background: Sit-to-Stand (STS) is a functional task fundamental for daily life autonomy. Due to its relevance in daily life, the assessment of movement during STS can be a useful tool for functional assessment, especially when analyzed using instruments that provide quantitative biomechanical indicators such as the Asymmetry Index, allowing inferences to be made about movement quality. Despite the relevance attributed to this indicator in the literature, its characterization in specific populations lacks research. Objectives: Characterize the bilateral asymmetry index (AI) in load distribution between lower limbs and center of pressure (CoP) displacement throughout the phases and subphases of the STS in healthy young adults, and to assess its relationship with individual factors. Methodology: An observational, descriptive-analytical, cross-sectional study was conducted, involving 54 healthy young adults with a median age of 23 years and an interquartile range of 6. The magnitude of the AI for ground reaction forces (GRF) and CoP displacement was analyzed using three force platforms (models FP4060-08 and FP4060-10) during the different phases and subphases of the STS task. The mean values and coefficient of variation (CV) of the AI were used for the analysis. The relationship between gender, BMI, physical activity level, and direction of asymmetry with the AI was also evaluated using Spearman's correlation and multiple linear regression models. Results: The magnitude of AI varied between 5-12% in GRF and 6-13% in CoP displacement, overall. Detailed analysis by phases and subphases revealed higher asymmetry values and statistically significant differences mainly in the subphases of the task whose biomechanical demands were higher. Regarding CV, values ranged from 36 to 75%, with fewer significant differences observed between phases. Weak correlations were identified between BMI and physical activity level determinants and AI magnitude values in specific phases of the task, with multiple linear regression models revealing limited explanatory power (R² < 0.1). Conclusion: The results showed that healthy young adults exhibit varying degrees of asymmetry throughout the STS with a high CV between repetitions, reinforcing the relevance of a phased analysis of the task. The identification of consistent asymmetry values allows reference values to be established for this population, which are fundamental for future comparisons with clinical populations. Additionally, the detection of statistically significant differences between phases and subphases highlights the potential of the STS as a sensitive tool for characterizing motor performance. On the other hand, the individual factors analyzed revealed only a limited association with the AI, with little statistical significance.
Background: Sit-to-Stand (STS) is a functional task fundamental for daily life autonomy. Due to its relevance in daily life, the assessment of movement during STS can be a useful tool for functional assessment, especially when analyzed using instruments that provide quantitative biomechanical indicators such as the Asymmetry Index, allowing inferences to be made about movement quality. Despite the relevance attributed to this indicator in the literature, its characterization in specific populations lacks research. Objectives: Characterize the bilateral asymmetry index (AI) in load distribution between lower limbs and center of pressure (CoP) displacement throughout the phases and subphases of the STS in healthy young adults, and to assess its relationship with individual factors. Methodology: An observational, descriptive-analytical, cross-sectional study was conducted, involving 54 healthy young adults with a median age of 23 years and an interquartile range of 6. The magnitude of the AI for ground reaction forces (GRF) and CoP displacement was analyzed using three force platforms (models FP4060-08 and FP4060-10) during the different phases and subphases of the STS task. The mean values and coefficient of variation (CV) of the AI were used for the analysis. The relationship between gender, BMI, physical activity level, and direction of asymmetry with the AI was also evaluated using Spearman's correlation and multiple linear regression models. Results: The magnitude of AI varied between 5-12% in GRF and 6-13% in CoP displacement, overall. Detailed analysis by phases and subphases revealed higher asymmetry values and statistically significant differences mainly in the subphases of the task whose biomechanical demands were higher. Regarding CV, values ranged from 36 to 75%, with fewer significant differences observed between phases. Weak correlations were identified between BMI and physical activity level determinants and AI magnitude values in specific phases of the task, with multiple linear regression models revealing limited explanatory power (R² < 0.1). Conclusion: The results showed that healthy young adults exhibit varying degrees of asymmetry throughout the STS with a high CV between repetitions, reinforcing the relevance of a phased analysis of the task. The identification of consistent asymmetry values allows reference values to be established for this population, which are fundamental for future comparisons with clinical populations. Additionally, the detection of statistically significant differences between phases and subphases highlights the potential of the STS as a sensitive tool for characterizing motor performance. On the other hand, the individual factors analyzed revealed only a limited association with the AI, with little statistical significance.
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Sit-to-Stand Índice de Assimetria Bilateral Jovens adultos saudáveis Cinética Biomecânica. Bilateral Asymmetry Index Healthy young adults Kinetics Biomechanics.