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nfluence of long-term wearing of unstable shoes on compensatory control of post...
Andreia S.P. Sousa; Andreia Silva; Rui Macedo; Rubim Santos; João Manuel R.S. TavaresPurpose: 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 pressure...
The influence of pauses on the fatigue of upper limb muscles during the task of...
Ângela Fernandes; Rubim Santos; Nuno Rocha; João Manuel R. S. TavaresThe aim of this study was to analyze the influence of position and pauses on muscle activity and fatigue during the task of ironing. Ten female participants performed the task of ironing in two different positions (standing and sitting) for 10 minutes each with a one-minute pause at the end of each task. Muscle activity and fatigue from the upper trapezium, anterior deltoid and pectoralis major were analyzed us...
Activation timing of soleus and tibialis anterior muscles during sit-to-stand a...
Augusta Silva; Andreia S. P. Sousa; Rita Pinheiro; Joana Ferraz; João Manuel R. S. Tavares; Rubim Santos; Filipa SousaIntroduction. 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 efficient and directed rehabilitation programs, a deeper knowledge about APAs during chall...
Influence of wearing an unstable shoe construction on compensatory control of p...
Andreia S.P. Sousa; Rui Macedo; Rubim Santos; João Manuel R. S. TavaresThis 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, under two conditions: barefoot and WUS. The electromyographic (EMG) activity of gastroc...
Interlimb coordination during the stance phase of gait in subjects with stroke
Andreia S. P. Sousa; Augusta Silva; Rubim Santos; Filipa Sousa; João Manuel R. S. TavaresObjective: To analyse 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: Patients from a physical medicine and rehabilitation clinic in Portugal (Braga). Participants: Sixteen subjects with post-stroke hemiparesis with the ability to walk independent...
Analysis of ground reaction force and electromyographic activity of the gastroc...
Andreia SP Sousa; Rubim Santos; Francisco PM Oliveira; Paulo Carvalho; João Manuel RS TavaresPurpose: 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 reaction force (GRF) of one limb affects the muscle activity required by the medial gastrocnemi...
Influence of wearing an unstable shoe on thigh and leg muscle activity and veno...
Andreia Sousa; João Manuel R.S.Tavares; Rui Macedo; Albano Manuel Rodrigues; Rubim SantosPurpose: 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...
Soleus Activity in post-Stroke Subjects: Movement Sequence from Standing to Sit...
Augusta Silva; Andreia S. P. Sousa; Rita Pinheiro; João Manuel R. S. Tavares; Rubim Santos; Filipa SousaIntroduction. The beginning of the movement sequence from standing to sitting requires the modulation of plantar flexors activity, including the 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 phase of standing to sitting in stroke subjects. Methods. Two groups of ten subjec...
Ankle dynamic in stroke patients: Agonist vs. antagonist muscle relations
Augusta Silva; Andreia S. P. Sousa; João Manuel R. S. Tavares; Ana Tinoco; Rubim Santos; Filipa SousaIntroduction: 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 coactivation (C) level in the contralateral (CONTRA) and ipsilateral (IPSI) limbs to the si...
Towards an Efficient and Robust Foot Classification from Pedobarographic Images
Francisco P. M. Oliveira; Andreia Sousa; Rubim Santos; João Manuel R. S. TavaresThis 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 using a set of plantar pressure images from two common pedobarographic devices. The resul...
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