Browsing by Author "Alves, Leonel Agostinho Teixeira"
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- STAIRGAIT: Gait and stair ascent biomechanical outputs - kinematic and kinectic correlations in a cross-sectional anlytical observational studyPublication . Alves, Leonel Agostinho Teixeira; Silva, Augusta; Sousa, AndreiaStair ascent is a more demanding functional task than gait, requiring complex coordination of the lower limbs. Few studies have explored the correlation of biomechanical outputs to assess the potential for transference across functional tasks. This study aims to investigate the correlation between the biomechanical outcomes of gait and stair ascent tasks across spatial-temporal, kinetic, and kinematic data in healthy adults aged over 30. 31 participants (16 males and 15 females) were recruited. The tasks were assessed with an optoelectronic motion capture system with 13 cameras to extract the maximum and minimum angles and the range of motion of the hip, knee, and ankle across the frontal, sagittal, and transverse planes. Two force plates were used to extract the joint moments for the same planes. All variables were compared between tasks, and those without significant diferences were assessed for correlations. All spatial-temporal variables showed significant differences. Of the kinetic variables, only the maximum hip extension moment exhibited a correlation. A strong positive correlation was found for the maximum ankle plantar flexion angle (p<0.0001, r=0.797), the maximum ankle supination (p<0.0001, r=0.865), and the maximum hip abduction angle (p<0.0001, r=0.703). Correlations between stair ascent and gait postulate the potential for transference of specific neuromotor components, suggesting a preliminary analysis to guide future studies.
- The influence of artificial breast volume induction on postural stability, postural orientation, and neuromuscular control in healthy women: a cross-sectional studyPublication . Guedes, Diana C.; Carneiro, Daniela Ferreira; Alves, Leonel Agostinho Teixeira; Melo, Ana S. C.; Moreira, Juliana; Cunha, Bruno; Santos, Rubim; Noites, Andreia; Sousa, Andreia S. P.; C. Guedes, Diana; Melo, Ana; Santos Moreira, Juliana; Cunha, Bruno; Rubim Silva Santos, Manuel; Noites, Andreia; Pinheiro de Sousa, Andreia SofiaThe percentage of breast augmentations has increased in recent years alongside the frequency of implant removals. Musculoskeletal and postural disorders are often overlooked during this removal process. Research indicates that excess anterior load from breast implants can disrupt postural control and potentially lead to short- or long-term musculoskeletal dysfunction. This study aims to evaluate the immediate changes in postural control after artificial breast augmentation in healthy female volunteers. Spinal angles, the center of pressure (CoP), and electromyographic activity of the spinal muscles were recorded in the static position and during the functional reach test (FRT) without and with implants of different volumes (220 mL, 315 mL, and 365 mL). Subjective perceptions of effort, comfort, weight, and performance in the FRT were also assessed. Statistical differences were significant in the scapular elevator during the one-minute standing position (lower activation with the 220 mL implant compared to the control and 315 mL) and in the trapezius muscles during the FRT (lower activation in the upper trapezius in the 315 mL vs. control in the reach phase and 220 mL vs. control in the return phase and higher activation in the lower trapezius in the 315 and 365 mL vs. control in the reach phase). Additionally, significant differences were identified in the performance of the FRT and the associated subjective perceptions. Breast implants with sizes of 220, 315, and 365 mL can alter scapular neuromuscular control, but these differences do not seem substantial enough to result in negative biomechanical effects in the short-term analysis.