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Efeitos de estar sentado, de pé ou em transições sentado/pé na dinâmica de acumulação de fluidos nos membros inferiores
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ntrodução: O objetivo deste estudo foi examinar os efeitos da interrupção do tempo sentado sobre a acumulação de fluidos nos membros inferiores, através da comparação entre a posição ininterrupta de pé, a posição ininterrupta sentada e a alternância entre estar de pé e estar sentado. Métodos: Foram avaliados 10 homens e 10 mulheres, com uma média de idades de 25,1±1,0 anos e 30,7±2,4 anos, respetivamente. A resistência (R), a reactância (Xc) e o ângulo de fase (AnF) foram obtidos através da análise de impedância bioelétrica (BIA). A massa gorda (MG) e a massa isenta de gordura (MIG) foram determinadas pela densitometria radiológica de dupla energia (DXA). Resultados: No protocolo segmentar verificaram-se diferenças significativas para a R, no segundo e terceiro tempo de medição (minutos 10 e 20), entre a condição sentada e de pé (-5,87±5,00; p < 0,05) e (-8,71±11,03; p < 0,05), e entre a condição sentada e intermitente (-10,43±14,52; p < 0,05) e (- 9,29±10,34; p < 0,05), respetivamente. Para os valores de R obtidos através da análise de corpo inteiro, ajustado para a altura do segmento e altura total, verificou-se a mesma tendência. Para os valores da Xc e AnF nos três momentos de medição, a nível total e segmentar, com e sem o ajuste para a estatura e altura do segmento, respetivamente, não foram encontradas diferenças estatisticamente significativas entre condições. Em adição, não houve efeito de interação entre a condição*sexo (p = 0,30). Conclusão: As condições de pé e intermitente revelaram maiores valores de R ao longo do tempo, o que significa uma menor acumulação de fluidos nos membros inferiores, em comparação com a posição sentada.
Introduction: The objective of this study was to examine the effects of breaking sitting time on leg swelling, by comparing uninterrupted motionless standing, uninterrupted motionless sitting and alternating between standing and sitting. Methods: A total of 10 men and 10 women were evaluated, with an average age of 25,1±1,0 years and 30,7±2,4 years, respectively. The resistance (R), reactance (Xc) and phase angle (PhA) were assessed by bioimpedance (BIA). To estimate fat mass and fat-free mass, dual energy X-ray absorptiometry (DXA) was used. Results: In the segmental BIA protocol, statistical differences for R values in the second and third time of measurement (10 and 20 minutes), respectively, were observed between sitting and standing condition (-5,87±5,00; p < 0,05) and (-8,71±11,03; p < 0,05), and between the sitting and intermittent condition (-10,43±14,52; p < 0,05) and (-9,29±10,34; p < 0,05) respectively. For R values, obtained through full body analysis, adjusted for the height of segment and total height, the same trend was verified. For Xc and PhA values in the three measurement moments, at the total and segmental level, with and without adjustment for the height and the height of the segment, respectively, no significant differences were found between conditions (p < 0,05). In addition, there was no interaction effect between condition*gender (p = 0,30). Conclusion: Standing and intermittent conditions revealed higher R values over time, which means less fluid accumulation in the legs, compared to the sitting position.
Introduction: The objective of this study was to examine the effects of breaking sitting time on leg swelling, by comparing uninterrupted motionless standing, uninterrupted motionless sitting and alternating between standing and sitting. Methods: A total of 10 men and 10 women were evaluated, with an average age of 25,1±1,0 years and 30,7±2,4 years, respectively. The resistance (R), reactance (Xc) and phase angle (PhA) were assessed by bioimpedance (BIA). To estimate fat mass and fat-free mass, dual energy X-ray absorptiometry (DXA) was used. Results: In the segmental BIA protocol, statistical differences for R values in the second and third time of measurement (10 and 20 minutes), respectively, were observed between sitting and standing condition (-5,87±5,00; p < 0,05) and (-8,71±11,03; p < 0,05), and between the sitting and intermittent condition (-10,43±14,52; p < 0,05) and (-9,29±10,34; p < 0,05) respectively. For R values, obtained through full body analysis, adjusted for the height of segment and total height, the same trend was verified. For Xc and PhA values in the three measurement moments, at the total and segmental level, with and without adjustment for the height and the height of the segment, respectively, no significant differences were found between conditions (p < 0,05). In addition, there was no interaction effect between condition*gender (p = 0,30). Conclusion: Standing and intermittent conditions revealed higher R values over time, which means less fluid accumulation in the legs, compared to the sitting position.
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Análise de impedância bioelétrica Ângulo de fase Comportamento sedentário De pé Edema dos membros inferiores Intermitente Quebra do comportamento sedentário Resistência Reactancia Sentado Bioimpedance analysis Interruption of sedentary behavior Leg swelling Phase angle Reactance Resistance Sedentary behavior Sit/stand transitions Sitting Standing