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Influence of wearing an unstable shoe construction on compensatory control of p...
Sousa, Andreia S. P.; Macedo, Rui; Santos, Rubim; Tavares, João ManuelThis study investigated the influence of wearing unstable shoe construction (WUS) on compensatory postural adjustments (CPA) associated with external perturbations. Thirty-two subjects stood on a force platform resisting an anterior-posterior horizontal force applied to a pelvic belt via a cable, which was suddenly released. They stood under two conditions: barefoot and WUS. The electromyographic (EMG) activity...
Influence of long-term wearing of unstable shoes on compensatory control of pos...
Sousa, Andreia S. P.; Silva, Andreia; Macedo, Rui; Santos, Rubim; Tavares, João ManuelPurpose: This study investigated the influence of long-term wearing of unstable shoes (WUS) on compensatory postural adjustments (CPA) to an external perturbation. Methods: Participants were divided into two groups: one wore unstable shoes while the other wore conventional shoes for 8 weeks. The ground reaction force signal was used to calculate the anterior– posterior (AP) displacement of the centre of pressur...
Interlimb relation during the double support phase of gait: an electromyographi...
Sousa, Andreia S. P.; Silva, Augusta; Tavares, João ManuelThe purpose of this study is to analyse the interlimb relation and the influence of mechanical energy on metabolic energy expenditure during gait. In total, 22 subjects were monitored as to electromyographic activity, ground reaction forces and VO2 consumption (metabolic power) during gait. The results demonstrate a moderate negative correlation between the activity of tibialis anterior, biceps femoris and vast...
Interlimb coordination during the stance phase of gait in subjects with stroke
Sousa, Andreia S. P.; Silva, Augusta; Santos, Rubim; Sousa, Filipa; Tavares, João ManuelObjective: To analyze the relation between contralesional and ipsilesional limbs in subjects with stroke during step-to-step transition of walking. Design: Observational, transversal, analytical study with a convenience sample. Setting: Physical medicine and rehabilitation clinic. Participants: Subjects (nZ16) with poststroke hemiparesis with the ability to walk independently and healthy controls (nZ22). Interv...
Activation timing of soleus and tibialis anterior muscles during sit-to-stand a...
Silva, Augusta; Santos, Rubim; Sousa, Andreia S. P.; Pinheiro, Ana Rita; Ferraz, Joana; Tavares, João Manuel; Sousa, FilipaO documento em anexo encontra-se na versão post-print (versão corrigida pelo editor). ; Introduction: Sit-to-stand (SitTS) and stand-to-sit (StandTS) are very important functional tasks that become compromised in stroke patients. As in other voluntary movements, they require an adequate postural control (PC) involving the generation of anticipatory postural adjustments (APAs). In order to give clues for more e...
Ankle dynamic in stroke patients: agonist vs. antagonist muscle relations
Silva, Augusta; Sousa, Andreia S. P.; Tavares, João Manuel; Tinoco, Ana; Santos, Rubim; Sousa, FilipaO documento em anexo encontra-se na versão post-print (versão corrigida pelo editor). ; Introduction: Atypical ankle patterns of muscle activity during gait are commonly reported in patients with stroke. These findings can be due to changes between tibialis anterior (TA) and soleus (SOL) coactivation mechanisms. Objective: To compare the electromyographic activity (EMGa) of SOL and TA muscles and antagonist co...
Soleus activity in post-stroke subjects: movement sequence from standing to sit...
Silva, Augusta; Pinheiro, Ana Rita; Sousa, Andreia S. P.; Tavares, João Manuel; Santos, Rubim; Sousa, FilipaO documento em anexo encontra-se na versão post-print (versão corrigida pelo editor). ; Introduction: The beginning of the movement sequence from standing to sitting requires the modulation of plantar flexors activity, including soleus muscle (SOL), to allow the forward translation of the tibia in relation to the foot, preserving its antigravity function. Purpose: To analyze the SOL activity during the initial...
Influence of wearing an unstable shoe on thigh and leg muscle activity and veno...
Sousa, Andreia S. P.; Tavares, João Manuel; Macedo, Rui; Rodrigues, Albano; Santos, RubimPurpose: To quantify the effect of unstable shoe wearing on muscle activity and haemodynamic response during standing. Methods: Thirty volunteers were divided into 2 groups: the experimental group wore an unstable shoe for 8 weeks, while the control group used a conventional shoe for the same period. Muscle activity of the medial gastrocnemius, tibialis anterior, rectus femoris and biceps femoris and venous cir...
Analysis of ground reaction force and electromyographic activity of the gastroc...
Sousa, Andreia S. P.; Santos, Rubim; Oliveira, Francisco; Carvalho, Paulo; Tavares, João ManuelO documento em anexo encontra-se na versão post-print (versão corrigida pelo editor). ; Purpose: Mechanisms associated with energy expenditure during gait have been extensively researched and studied. According to the double-inverted pendulum model energy expenditure is higher during double support, as lower limbs need to work to redirect the centre of mass velocity. This study looks into how the ground reacti...
Towards an efficient and robust foot classification from pedobarographic images
Oliveira, Francisco; Sousa, Andreia S. P.; Santos, Rubim; Tavares, João ManuelO documento em anexo encontra-se na versão post-print (versão corrigida pelo editor). ; This paper presents a new computational framework for automatic foot classification from digital plantar pressure images. It classifies the foot as left or right and simultaneously calculates two well-known footprint indices: the Cavanagh's arch index and the modified arch index. The accuracy of the framework was evaluated ...
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