Estudo do impacto de diferentes posicionamentos corporais, agachamento e flexão unipodal na perfusão no membro inferior : uma abordagem exploratória complementada pela espectroscopia óptica (TiVi)
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Data
2020
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A postura corporal e o movimento parecem ser responsáveis por múltiplas variações da microcirculação no pé, embora
mal caracterizadas pelas dificuldades associadas à medição durante o movimento. Este estudo-piloto procurou explorar
um novo meio não-invasivo, a espectroscopia de luz polarizada pelo sistema TiVi, em condições ortostáticas e dinâmicas.
Foram selecionados cinco participantes (26.0 ± 6.5 anos de idade) saudáveis de ambos os sexos, devidamente informados.
O protocolo envolveu modificações sequenciais da postura (variação ortostática) e movimentos dinâmicos (agachamento
e flexão unipodal). As variações da perfusão foram avaliadas em ambos os pés através da fluxometria de laser-Doppler
(LDF) e da espectroscopia de polarização (TiVi). Ambos os sistemas revelaram o mesmo tipo de modificação das
variáveis relacionadas com a alteração de fluxo. Os resultados mais expressivos foram registados com o exercício, em
especial com o agachamento provocando um marcado aumento da perfusão no pé. Menos evidente mas no mesmo
sentido, o aumento de perfusão registada com a flexão unipodal mas, observada também no membro contralateral. O
presente estudo confirmou o interesse da utilização do TiVi nestes domínios, bem como a adequabilidade deste desenho
experimental para procurar conhecer mais profundamente o impacto do movimento do membro inferior sobre a dinâmica
funcional do pé.
Body posture and movement seem to be responsible for multiple variations of microcirculation in the foot, although difficulties associated with measurement during movement have limited their characterization. This pilot study sought to explore a new non-invasive instrument based on polarized light spectroscopy – the TiVi system, under orthostatic and dynamic conditions. Five healthy participants (duly informed, 26.0 ± 6.5 years of age) of both genders were selected. The protocol involved sequential posture changes (orthostatic variation) and dynamic movements (squatting and unipodal flexion). Perfusion variations were evaluated in both feet by laser-Doppler flowmetry (LDF) and polarized spectroscopy (TiVi). Both systems revealed the same type of modification of these flow-related variables. The most pronounced changes were obtained with exercise, especially with squatting, which caused a marked increase in foot perfusion. Less dramatic but in the same direction, the increased perfusion with unipodal flexion was also observed in the contralateral limb. This study confirmed the interest in using the TiVi system in these domains, as well as the appropriateness of this experimental design to look deeper into the impact of lower limb movement on the functional dynamics of the foot.
Body posture and movement seem to be responsible for multiple variations of microcirculation in the foot, although difficulties associated with measurement during movement have limited their characterization. This pilot study sought to explore a new non-invasive instrument based on polarized light spectroscopy – the TiVi system, under orthostatic and dynamic conditions. Five healthy participants (duly informed, 26.0 ± 6.5 years of age) of both genders were selected. The protocol involved sequential posture changes (orthostatic variation) and dynamic movements (squatting and unipodal flexion). Perfusion variations were evaluated in both feet by laser-Doppler flowmetry (LDF) and polarized spectroscopy (TiVi). Both systems revealed the same type of modification of these flow-related variables. The most pronounced changes were obtained with exercise, especially with squatting, which caused a marked increase in foot perfusion. Less dramatic but in the same direction, the increased perfusion with unipodal flexion was also observed in the contralateral limb. This study confirmed the interest in using the TiVi system in these domains, as well as the appropriateness of this experimental design to look deeper into the impact of lower limb movement on the functional dynamics of the foot.
Descrição
Biomedical and biopharmaceutical research : jornal de investigação biomédica e biofarmacêutica
Palavras-chave
CIÊNCIAS MÉDICAS, BIOMEDICINA, PÉS, MICROCIRCULAÇÃO, FLUXOMETRIA POR LASER-DOPPLER, MEDICAL SCIENCES, BIOMEDICINE, FEET, MICROCIRCULATION, LASER-DOPPLER FLOWMETRY