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posterior center of pressure

Laetitia Claverie, Anne Ille, Pierre Moretto
The aim of this study was to determine the distribution of discrete sensors under the footprint for accurate plantar pressure analyses. For this purpose, two different sensor layouts have been tested and compared, to determine which was the most accurate to monitor plantar pressure with wireless devices in research and/or clinical practice. Ten healthy volunteers participated in the study (age range: 23-58 years). The barycenter of pressures (BoP) determined from the plantar pressure system (W-inshoe®) was compared to the center of pressures (CoP) determined from a force platform (AMTI) in the medial-lateral (ML) and anterior-posterior (AP) directions...
October 10, 2016: Medical Engineering & Physics
Jernej Čamernik, Zrinka Potocanac, Luka Peternel, Jan Babič
When balance is exposed to perturbations, hand contacts are often used to assist postural control. We investigated the immediate and the transitionary effects of supportive hand contacts during continuous anteroposterior perturbations of stance by automated waist-pulls. Ten young adults were perturbed for 5 min and required to maintain balance by holding to a stationary, shoulder-high handle and following its removal. Center of pressure (COP) displacement, hip, knee and ankle angles, leg and trunk muscle activity and handle contact forces were acquired...
2016: Frontiers in Human Neuroscience
Merete B Speedtsberg, Sofie B Christensen, Ken Kjøller Andersen, Jesper Bencke, Bente R Jensen, Derek J Curtis
BACKGROUND: Developmental coordination disorder (DCD) is a neurodevelopmental impairment that affects approximately 6% of children in primary school age. Children with DCD are characterized by impaired postural control. It has yet to be determined what effect peripheral and central neuromuscular control has on their balance control. OBJECTIVE: The aim of this study was to investigate the underlying mechanisms to impaired postural control in children with DCD using the rambling-trembling decomposition of the center of pressure (CoP)...
September 24, 2016: Gait & Posture
E Arnaud, G Paternoster, S James, M-P Morisseau-Durand, V Couloigner, P Diner, C Tomat, V Viot-Blanc, B Fauroux, V Cormier-Daire, G Baujat, M Robert, A Picard, S Antunez, R Khonsari, L Pamphile-Tabuteau, C Legros, M Zerah, P Meyer
The complexity of treatment of faciocraniosynostosis justifies the treatment in a reference center for rare diseases. The growth disturbances in the skull and face being variable according to the type of mutation in the FGFr (Crouzon, Pfeiffer, Apert), the strategy is adapted to the phenotype according to the following principles: posterior expansion with or without distraction around 6 months to limit the descent of the cerebellum tonsils and to prevent the turricephalic development; fronto-facial monobloc advancement with internal distraction around the age of 18 months in case of severe exorbitism or breathing impairment...
October 2016: Annales de Chirurgie Plastique et Esthétique
Emilie Viollet, Dominique Richard, Mylène Blot, Fabrice Nouvel
OBJECTIVE: A total of 27.6% of elderly people can not transfer from supine to sitting position. This driving plan consists on an anterior flexion and rotation of trunk to bring center of mass near the edge of bed. With ageing, we observe modifications like more requests of upper limbs and less turn side. The aim of this study is to compare influence of two assistive devices in the supine to sitting transfer: SAM, a new bed rails and the lifting pole. PATIENTS AND METHODS: Patients more than 65 years, after consent signature, were lying in a medical bed with lifting pole or SAM after randomisation...
September 2016: Annals of Physical and Rehabilitation Medicine
Imen Fekhfekh, Abdelmoneem Yahia, Mokhtar Chaabene, Salma Jribi, Nizar Suissi, Mohamed Habib Elleuch, Sameh Ghroubi
OBJECTIVE: To study the acute effect of static and dynamic stretching on the knee muscle strength and postural capacity in athletes. PATIENTS AND METHODS: Fifteen judokas performed 2 stretching protocols (static and dynamic) on the muscles of both lower limbs with an interval of 48hours in a random order. An evaluation of the dominant knee muscle strength with an isokinetic dynamometer CybexNormII was performed before and after each stretching protocol in a concentric mode at a speed of 60 and 180°/s...
September 2016: Annals of Physical and Rehabilitation Medicine
Abdelmoneem Yahia, Houcem Ksentini, Salma Jribi, Atika Mellek, Mohamed Habib Elleuch, Sameh Ghroubi
OBJECTIVE: The aim of the study was to investigate the relations between isokinetic muscle strength of the knee, postural profile and physical function in knee osteoarthritis patients. MATERIAL/PATIENTS AND METHODS: We included patients with advanced unilateral osteoarthritis (grades III or IV graded radiographically by Lawrence classification). We assessed functional impairment by the WOMAC score in its Arabic version, the strength of the knee muscles by isokinetic dynamometry and postural profile via the Satel(®) platform in bipodal and monopodal conditions in open and closed eyes...
September 2016: Annals of Physical and Rehabilitation Medicine
Marie Lumeau, Mathieu Lempereur, Emmanuel Sonnet, Olivier Remy Neris
OBJECTIVE: Distal sensorimotor polyneuropathy (DPN) is a leading risk factor of developing ulcer, including increased pressures at the forefoot. The rocker sole shoes are prescribed to decrease pressures but could induce instability [1]. The aim of this study was to compare the postural stability between normal shoes (NS) and rocker sole shoes (RSS) in patients with type 2 diabetes and DPN. MATERIAL/PATIENTS AND METHODS: In this preliminary, randomized, controlled study, NS and RSS were compared during static standing and gait...
September 2016: Annals of Physical and Rehabilitation Medicine
Clément Provost, Giulia Piccinini, Sophie Tasseel-Ponche, Pierre Lozeron, Bertrand Arnulf, Alain Yelnik
OBJECTIVE: As proposed after stroke, the study of reactions to a sensory stimulation allows to a better understanding of postural strategies. Below, we provide the analysis in chronic acquired demyelinating polyneuropathies (CADP). MATERIAL/PATIENTS AND METHODS: Prospective study of 25 healthy subjects (57±12years, 8M, 17F) and 25 CADP (66±14years, 20M, 5F) on stabilometric platform (Techno-Concept(®), France). Proprioception was disturbed by tendon vibration on Triceps Surae (TS) and Tibialis Anterior (TA)...
September 2016: Annals of Physical and Rehabilitation Medicine
Guilherme S Nunes, Marcos de Noronha
OBJECTIVES: To investigate the impact different ways to define reference balance can have when analysing time to stabilization (TTS). Secondarily, to investigate the difference in TTS between people with chronic ankle instability (CAI) and healthy controls. DESIGN: Cross-sectional study. SETTING: Laboratory. PARTICIPANTS: Fifty recreational athletes (25 CAI, 25 controls). MAIN OUTCOME MEASURES: TTS of the center of pressure (CoP) after maximal single-leg vertical jump using as reference method the single-leg stance, pre-jump period, and post-jump period; and the CoP variability during the reference methods...
August 1, 2016: Physical Therapy in Sport
Rachel L Lenhart, Sylvester Youlo, Mary K Schroth, Kenneth J Noonan, James McCarthy, David Mann, Scott Hetzel, Sarah A Sund, Matthew A Halanski
BACKGROUND: Respiratory weakness and spinal deformity are common in patients with spinal muscular atrophy (SMA). Posterior (distraction type) growing rods have recently gained favor as a treatment option in this population, due to their ability to prevent spinal deformity progression and their potential to allow lung volumes to increase over time. The objective of this study was to determine the impact of posterior growing rods on the spinal alignment and respiratory function in children with SMA with intermediate term follow-up...
September 15, 2016: Journal of Pediatric Orthopedics
Zhale Rajavi, Hamideh Sabbaghi
Congenital cataract is a leading cause of visual deprivation which can damage the developing visual system of a child; therefore early diagnosis, management and long-term follow-up are essential. It is recommended that all neonates be screened by red reflex examination at birth and suspected cases be referred to ophthalmic centers. Early surgery (<6 weeks of age, based on general neonatal health) is important for achieving the best visual outcome particularly in unilateral cases. In bilateral cases, surgery is highly recommended before appearance of strabismus or nystagmus (<10 weeks of age) with no longer than a one-week interval between the fellow eyes...
July 2016: Journal of Ophthalmic & Vision Research
Massimiliano Pau, Federico Mereu, Marco Melis, Bruno Leban, Federica Corona, Gianfranco Ibba
PURPOSE: The aim of this study is to assess the effect of actual match effort on dynamic balance abilities in young elite soccer players. METHODS: Seventeen Under 15 male players who compete at national level participated in the study. Their dynamic balance was assessed by having them jump starting with both feet on the ground in a standing position and land on one foot only. Their vertical time to stabilization (vTTS) and postural sway were calculated before and after 35 min of an unofficial match...
May 21, 2016: Physical Therapy in Sport
R A Clark, F J-T Seah, H-C Chong, C L-L Poon, J W-M Tan, B F Mentiplay, Y-H Pua
OBJECTIVE: Little is known about how static standing balance changes post total knee arthroplasty (TKA). The primary aim of this study was to examine the sensitivity to change and redundancy of center of pressure (COP) variables post-TKA. The secondary aim was to compare the sensitivity of these measures to standard clinical assessments of one repetition maximum knee extension strength and fast pace gait speed. DESIGN: 466 participants performed instrumented double-limb standing balance tests with eyes open at 4 and 12 weeks post-TKA...
August 27, 2016: Osteoarthritis and Cartilage
Trevor D Magnotti, Danielle McElhiney, Jeffrey A Russell
Lower extremity injury is prevalent in marching musicians, and poor postural stability is a possible risk factor for this. The external load of an instrument may predispose these performers to injury by decreasing postural stability. The purpose of this study was to determine the relationship between instrument load and static and dynamic postural stability in this population. Fourteen university marching musicians were recruited and completed a balance assessment protocol on a force platform with and without their instrument...
September 2016: Medical Problems of Performing Artists
Guilherme S Nunes, Marcos de Noronha, Bruna Wageck, Juliana Bonetti Scirea, Alessandro Haupenthal, Stella Maris Michaelsen
There is some evidence showing that people with functional ankle instability (FAI) can present changes in postural control during the landing phase of a jump. These studies also show preliminary results indicating possible changes during phases prior to landing. Therefore, the objective of this study was to investigate whether movement adjustments prior to a jump are different between people with and without FAI. Sixty participants with (n=30) and without (n=30) FAI participated in this study. The main outcome measures were the variability of range of motion in ankle inversion/eversion and dorsiflexion/plantarflexion; and variability of center of pressure for the directions anterior-posterior and medio-lateral during the pre-jump period for drop jump, vertical jump and during single-leg stance...
October 2016: Human Movement Science
Valeska Gatica-Rojas, Ricardo Cartes-Velásquez, Guillermo Méndez-Rebolledo, Eduardo Guzman-Muñoz, L Eduardo Cofré Lizama
OBJECTIVE: This study sought to evaluate the effects of a Nintendo Wii Balance Board (NWBB) intervention on ankle spasticity and static standing balance in young people with spastic cerebral palsy (SCP). METHODS: Ten children and adolescents (aged 72-204 months) with SCP participated in an exercise program with NWBB. The intervention lasted 6 weeks, 3 sessions per week, 25 minutes for each session. Ankle spasticity was assessed using the Modified Modified Ashworth Scale (MMAS), and static standing balance was quantified using posturographic measures (center-of-pressure [CoP] measures)...
August 18, 2016: Developmental Neurorehabilitation
Zacharie Beaulne-Séguin, Julie Nantel
INTRODUCTION: We asked whether conflicting visual cues influences gait initiation, gait inhibition and postural control in Parkinson's disease (PD) between freezers, non-freezers and healthy older adults. METHODS: Twenty-five PD participants on dopaminergic medication and 17 healthy older adults were asked to initiate or refrain gait depending on visual cues: green GO (GG), green STOP (GS), red GO (RG), red STOP (RS). Center of pressure (CoP) displacement, variability and mean velocity (VCoP) in the anterior-posterior (AP) and medial-lateral (ML) directions and movement time (MT) were measured...
September 2016: Gait & Posture
Dorothée C van Trier, Anna M C Vos, Renske W Draaijer, Ineke van der Burgt, Jos M Th Draaisma, Johannes R M Cruysberg
PURPOSE: To determine the full spectrum of ocular manifestations in patients with Noonan syndrome (NS). DESIGN: Prospective cross-sectional clinical and genetic study in a tertiary referral center. PARTICIPANTS: Twenty-five patients with NS (mean age, 14 years; range, 8 months-25 years) clinically diagnosed by validated criteria. METHODS: All patients were examined by the same team following a detailed study protocol...
October 2016: Ophthalmology
Su-Bin Joo, Seung Eel Oh, Joung Hwan Mun
In this study, we describe a method to predict 6-axis ground reaction forces based solely on plantar pressure (PP) data obtained from insole type measurement devices free of space limitations. Because only vertical force is calculable from PP data, a wavelet neural network derived from a non-linear mapping function was used to obtain 3-axis ground reaction force in medial-lateral (GRFML), anterior-posterior (GRFAP) and vertical (GRFV) and 3-axis ground reaction moment in sagittal (GRFS), frontal (GRFF) and transverse (GRFT) data for the remaining axes and planes...
July 30, 2016: Journal of Biomechanics
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