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Search Results: 1 - 10 of 465429 matches for " Mariana A.;Salvini "
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The effects of knee extensor eccentric training on functional tests in healthy subjects
Santos, Heleodório H.;ávila, Mariana A.;Hanashiro, Daniela N.;Camargo, Paula R.;Salvini, Tania F.;
Brazilian Journal of Physical Therapy , 2010, DOI: 10.1590/S1413-35552010005000014
Abstract: background: it is well known that eccentric training increases muscle strength and promotes greater neural activation, and therefore has been used in the recovery of knee extensors. the hypothesis of this study was that there would be a strong correlation between knee extensor torque and functional tests. objectives: to investigate the relationship between knee extensor peak torque and functional tests of agility (runs) and propulsion (hop for distance) after short-term isokinetic eccentric training. methods: twenty healthy and active male undergraduate students (age 22.5±2.1 years; height 1.72±0.10 m; weight 67.8±9.5 kg; body mass index: 22.5±2.0 kg/m2), with no abnormalities or history of injury of the limbs, performed an isokinetic assessment of the knee extensors and flexors and also functional tests before and after isokinetic training, which consisted of 3 sets of 10 mvecs at 30o/s, with 3 minutes of rest between sets, twice a week for 6 weeks. results: the eccentric training increased the extensor peak torque (16, 27 and 17%; p<0.01) and decreased the h/q ratio (10, 20 and 13%; p<0.01) for the isometric and eccentric modes at 30°/s and 120°/s, respectively. it also decreased the time in two of the five agility tests (carioca and pivot diagonal; p<0.01), and increased the distance in the hop tests, for both dominant and non-dominant limbs (p<0.01). conclusions: although the eccentric training led to an increase in extensor peak torques as well as an improvement in most of the functional tests, the hypothesis that a strong correlation would be observed between peak torques and functional tests was not confirmed. article registered in the australian new zealand clinical trials registry (anzctr) under the number 12607000590460.
Functional and morphological changes in the quadriceps muscle induced by eccentric training after ACL reconstruction
Brasileiro, Jamilson S.;Pinto, Olga M. S. F.;ávila, Mariana A.;Salvini, Tania F.;
Brazilian Journal of Physical Therapy , 2011, DOI: 10.1590/S1413-35552011005000012
Abstract: objectives: the purpose of this study was to investigate the contributions of functional and morphological factors in the recovery of the quadriceps muscle after anterior cruciate ligament (acl) reconstruction. methods: nine subjects (31.3±5.8 years) underwent eccentric exercise sessions twice a week for 12 weeks. quadriceps muscle function was evaluated using an isokinetic dynamometer (isometric and eccentric peak torque) and electromyography (rms). morphological changes were measured using magnetic resonance imaging. results: the initial evaluation showed a significant deficit in knee extensor torque in the involved limb and significant muscle atrophy along the length of the quadriceps. emg activity was lower in all tested situations. eccentric training significantly increased isokinetic torque (from 199±51 to 240±63, p<0.05, respectively) and quadriceps area, with the greatest hypertrophy in the proximal thigh region (from 169±27 to 189±25.8 cm2, p<0.01). the emg activity of vastus medialis increased after the first six weeks of eccentric training. the increased extensor torque was correlated with quadriceps cross-sectional area (r=0.81, p<0.01) and emg activity (r=0.69, p<0.05). after twelve weeks of training, there was a correlation only between torque and cross-sectional area (r=0.78, p<0.01). conclusions: 1) eccentric training proved to be a potent resource for the quadriceps recovery, both morphologically and functionally, 2) the contributions of functional and morphological factors varied according to the length of training.
Reliability of isokinetic evaluation in passive mode for knee flexors and extensors in healthy children
Adriana N. Santos,Silvia L. Pav?o,Mariana A. Avila,Tania F. Salvini
Brazilian Journal of Physical Therapy , 2013,
Abstract: BACKGROUND: The isokinetic dynamometer has been considered the gold-standard measurement of muscle performance. However, the reliability for the passive mode in children has not been reported to date. OBJECTIVES: The purpose was to evaluate the reliability of the isokinetic dynamometer in passive mode in children. METHOD: Twenty-one healthy children (ten girls, eleven boys), aged 5 to 12 years (age: 8.5±2.2 years), were evaluated using an isokinetic dynamometer. Each participant was tested twice with a one-week interval and performed five consecutive cycles of knee extension and flexion. The test was performed at 60o/s in the concentric passive mode and the children performed maximal contractions. The measured variables were peak torque, average peak torque, total work, and average power, time to peak torque and angle of peak torque for dominant and non-dominant lower limbs. Reliabilities were determined using intraclass correlation coefficient (ICC3,1), standard error of measurement (SEM and SEM%), and coefficient of variation (CV). RESULTS: We found good reliability in both lower limbs for peak torque, average peak torque, total work and average power of knee flexors and extensors, with ICC3,1 values greater than 0.80; SEM ranging from 6.7 to 79.2; SEM% ranging from 10.4% to 16.8%; CV lower than 15%. Bland-Altman analysis showed that the bias was low than 10% and limits of agreement (LOAs) ranging from 33.9% to 59.2%, and -28.8% and -52.8%, showing that measures tended to disagree. However, time to peak torque (ICC3,1<0.68; SEM > 0.34; SEM%>37.4%; CV>41.7%; bias >24.0%; LOA>101.0%) and angle of peak torque (ICC3,1<0.76; SEM>9.3; SEM%>27.6%; CV>15.3%; bias>11.0%; LOA>61.0%) were not reliable. CONCLUSIONS: The findings indicate that isokinetic evaluation in passive mode for knee extensors and flexors of dominant and non-dominant lower limbs of children without disabilities was reliable for peak torque, average peak torque, work, and power. However, average time to peak torque and angle of peak torque were not reliable.
Functional and morphological changes in the quadriceps muscle induced by eccentric training after ACL reconstruction Altera es funcionais e morfológicas do quadríceps induzidas pelo treinamento excêntrico após reconstru o do LCA
Jamilson S. Brasileiro,Olga M. S. F. Pinto,Mariana A. ávila,Tania F. Salvini
Brazilian Journal of Physical Therapy , 2011,
Abstract: OBJECTIVES: The purpose of this study was to investigate the contributions of functional and morphological factors in the recovery of the quadriceps muscle after anterior cruciate ligament (ACL) reconstruction. METHODS: Nine subjects (31.3±5.8 years) underwent eccentric exercise sessions twice a week for 12 weeks. Quadriceps muscle function was evaluated using an isokinetic dynamometer (isometric and eccentric peak torque) and electromyography (RMS). Morphological changes were measured using magnetic resonance imaging. RESULTS: The initial evaluation showed a significant deficit in knee extensor torque in the involved limb and significant muscle atrophy along the length of the quadriceps. EMG activity was lower in all tested situations. Eccentric training significantly increased isokinetic torque (from 199±51 to 240±63, p<0.05, respectively) and quadriceps area, with the greatest hypertrophy in the proximal thigh region (from 169±27 to 189±25.8 cm2, p<0.01). The EMG activity of vastus medialis increased after the first six weeks of eccentric training. The increased extensor torque was correlated with quadriceps cross-sectional area (r=0.81, p<0.01) and EMG activity (r=0.69, p<0.05). After twelve weeks of training, there was a correlation only between torque and cross-sectional area (r=0.78, p<0.01). CONCLUSIONS: 1) eccentric training proved to be a potent resource for the quadriceps recovery, both morphologically and functionally, 2) the contributions of functional and morphological factors varied according to the length of training. OBJETIVOS: O propósito deste estudo foi avaliar as contribui es dos fatores funcionais e morfológicos na recupera o da for a muscular do quadríceps femoral após reconstru o do Ligamento Cruzado Anterior (LCA). MéTODOS: Nove indivíduos (31,3±5,8 anos) foram treinados por meio de contra es excêntricas máximas, duas vezes por semana, durante 12 semanas. A fun o do quadríceps foi avaliada pela dinamometria isocinética (pico de torque isométrico e excêntrico) e pela eletromiografia (EMG). As altera es morfológicas foram mensuradas por meio de ressonancia magnética (RNM). Na avalia o inicial, observou-se significativo déficit no torque extensor do joelho do membro acometido, com hipotrofia muscular de todo o quadríceps e redu o na atividade EMG, quando comparado ao membro n o-acometido. RESULTADOS: O treinamento excêntrico produziu aumento no torque excêntrico a 30o/s (de 199±51 Nm para 240±63 Nm, p<0,05) e no volume muscular, sendo que maiores hipertrofias ocorreram na regi o proximal da coxa (de 169±27 para 189±25,8 cm2
Eccentric training for shoulder abductors improves pain, function and isokinetic performance in subjects with shoulder impingement syndrome: a case series
Camargo, Paula R.;Avila, Mariana A.;Alburquerque-Sendín, Francisco;Asso, Naoe A.;Hashimoto, Larissa H.;Salvini, Tania F.;
Brazilian Journal of Physical Therapy , 2012, DOI: 10.1590/S1413-35552012000100013
Abstract: background: conservative treatments have been proposed for people with shoulder impingement syndrome (sis), such as strengthening of the rotator cuff and scapular muscles and stretching of the soft tissues of the shoulder. however, there is a lack of studies analyzing the effectiveness of eccentric training in the treatment of sis. objectives: to evaluate the effects of eccentric training for shoulder abductors on pain, function, and isokinetic performance during concentric and eccentric abduction of the shoulder in subjects with sis. methods: twenty subjects (7 females, 34.2 sd 10.2 years, 1.7 sd 0.1 m, 78.0 sd 16.3 kg) with unilateral sis completed the study protocol. bilateral isokinetic eccentric training at 60o/s for shoulder abductors was performed for six consecutive weeks, twice a week, on alternate days. for each training day, three sets of 10 repetitions were performed with a 3-minute rest period between the sets for each side. the range of motion trained was 60° (ranging from 80° to 20°). the disabilities of the arm, shoulder and hand (dash) questionnaire was used to evaluate functional status and symptoms of the upper limbs. peak torque, total work and acceleration time were measured during concentric and eccentric abduction of the arm at 60o/s and 180o/s using an isokinetic dynamometer. results: dash scores, peak torque, total work and acceleration time improved (p<0.05) after the period of intervention. conclusions: this study suggests that isokinetic eccentric training for shoulder abductors improves physical function of the upper limbs in subjects with sis.
Intraplate Transtensional Tectonics in the East Antarctic Craton: Insight from Buried Subglacial Bedrock in the Lake Vostok—Dome C Region  [PDF]
Paola Cianfarra, Francesco Salvini
International Journal of Geosciences (IJG) , 2013, DOI: 10.4236/ijg.2013.49122
Abstract:

This study presents the results of forward numerical models of a series of sections of the Aurora Trench (East Antarctica) derived from radio echo-sounding data that allowed to reconstruct the 3D shape of the Aurora Fault, a crustal listric normal fault characterized by a length exceeding 100 km. A similar extensional fault setting allows to replicate the asymmetric buried morphology of the magnetic basement at the Lake Vostok depression derived by the available gravity and magnetic profiles. Both the Aurora and Vostok listric fault reach their basal decollment at 34 km depth, possibly the base of the crust in this intracratonic environment. Integration of these results with the existing geologic interpretations of the tectonic origin of the Concordia Trench by normal faulting allowed to frame the Concordia, Aurora and Vostok normal faults within an intraplate transtensional corridor with a left-lateral movement component. The westward projection of the proposed strike-slip deformation belt may develop in correspondence of an older tectonic lineament stretching from the Eastern flanks of the Gamburtsev Subglacial Mts to the Lambert rift and characterized by a poly-phased complex tectonic history. The possible Cenozoic reactivation of these structures is discussed in the paper.

Automatic and Parallel Optimized Learning for Neural Networks performing MIMO Applications
FULGINEI, F. R.,LAUDANI, A.,SALVINI, A.,PARODI, M.
Advances in Electrical and Computer Engineering , 2013, DOI: 10.4316/aece.2013.01001
Abstract: An automatic and optimized approach based on multivariate functions decomposition is presented to face Multi-Input-Multi-Output (MIMO) applications by using Single-Input-Single-Output (SISO) feed-forward Neural Networks (NNs). Indeed, often the learning time and the computational costs are too large for an effective use of MIMO NNs. Since performing a MISO neural model by starting from a single MIMO NN is frequently adopted in literature, the proposed method introduces three other steps: 1) a further decomposition; 2) a learning optimization; 3) a parallel training to speed up the process. Starting from a MISO NN, a collection of SISO NNs can be obtained by means a multi-dimensional Single Value Decomposition (SVD). Then, a general approach for the learning optimization of SISO NNs is applied. It is based on the observation that the performances of SISO NNs improve in terms of generalization and robustness against noise under suitable learning conditions. Thus, each SISO NN is trained and optimized by using limited training data that allow a significant decrease of computational costs. Moreover, a parallel architecture can be easily implemented. Consequently, the presented approach allows to perform an automatic conversion of MIMO NN into a collection of parallel-optimized SISO NNs. Experimental results will be suitably shown.
Processi di investimento e dimensione economica delle imprese agricole
Ezio Salvini
Aestimum , 1988,
Abstract:
Block tectonics in thin-skin style-deformed regions: examples from structural data in central Appennines
F. Salvini
Annals of Geophysics , 1993, DOI: 10.4401/ag-4277
Abstract:
SUSY Long-Lived Massive Particles: Detection and Physics at the LHC
S. Ambrosanio,B. Mele,A. Nisati,S. Petrarca,G. Polesello,A. Rimoldi,G. Salvini
Physics , 2000,
Abstract: We draw a possible scenario for the observation of massive long-lived charged particles at the LHC detector ATLAS. The required flexibility of the detector triggers and of the identification and reconstruction systems are discussed. As an example, we focus on the measurement of the mass and lifetime of long-lived charged sleptons predicted in the framework of supersymmetric models with gauge-mediated supersymmetry (SUSY) breaking. In this case, the next-to-lightest SUSY particle can be the light scalar partner of the tau lepton, possibly decaying slowly into a gravitino. A wide region of the SUSY parameters space was explored. The accessible range and precision on the measurement of the SUSY breaking scale parameter sqrt(F) achievable with a counting method are assessed.
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