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283 results on '"Vannozzi, G"'

9. Added value of the instrumented Timed-Up and Go test (iTUG) in the long-term assessment of PD patients with bilateral subthalamic nucleus deep brain stimulation (STN-DBS)

Author

Campanini, I., primary, Cavallieri, F., additional, Damiano, B., additional, Scaltriti, S., additional, Fioravanti, V., additional, Guagnano, N., additional, Vannozzi, G., additional, Bergamini, E., additional, Gessani, A., additional, Budriesi, C., additional, Antonelli, F., additional, Rispoli, V., additional, Lusuardi, M., additional, Valzania, F., additional, and Merlo, A., additional

Published
2022
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17. Modifications in prefrontal cortex oxygenation in linear and curvilinear dual task walking: A combined fNIRS and IMUs study

Author

Belluscio, V., Casti, G., Ferrari, M., Quaresima, V., Sappia, M.S., Horschig, J.M., Vannozzi, G., Belluscio, V., Casti, G., Ferrari, M., Quaresima, V., Sappia, M.S., Horschig, J.M., and Vannozzi, G.

Abstract

Contains fulltext : 240537.pdf (Publisher’s version ) (Open Access), Increased oxygenated hemoglobin concentration of the prefrontal cortex (PFC) has been observed during linear walking, particularly when there is a high attention demand on the task, like in dual-task (DT) paradigms. Despite the knowledge that cognitive and motor demands depend on the complexity of the motor task, most studies have only focused on usual walking, while little is known for more challenging tasks, such as curved paths. To explore the relationship between cortical activation and gait biomechanics, 20 healthy young adults were asked to perform linear and curvilinear walking trajectories in single-task and DT conditions. PFC activation was assessed using functional near-infrared spectroscopy, while gait quality with four inertial measurement units. The Figure-of-8-Walk-Test was adopted as the curvilinear trajectory, with the "Serial 7s" test as concurrent cognitive task. Results show that walking along curvilinear trajectories in DT led to increased PFC activation and decreased motor performance. Under DT walking, the neural correlates of executive function and gait control tend to be modified in response to the cognitive resources imposed by the motor task. Being more representative of real-life situations, this approach to curved walking has the potential to reveal crucial information and to improve people's balance, safety, and life's quality.

Published
2021

21. Upper limb joint kinematics using wearable magnetic and inertial measurement units: an anatomical calibration procedure based on bony landmark identification

Author

Picerno, P, Caliandro, Pietro, Iacovelli, Chiara, Simbolotti, C, Crabolu, M, Pani, D, Vannozzi, G, Reale, Giuseppe, Rossini, Pm, Padua, Luca, Cereatti, A, Caliandro P (ORCID:0000-0002-1190-4879), Iacovelli C, Reale G, Padua L (ORCID:0000-0003-2570-9326), Picerno, P, Caliandro, Pietro, Iacovelli, Chiara, Simbolotti, C, Crabolu, M, Pani, D, Vannozzi, G, Reale, Giuseppe, Rossini, Pm, Padua, Luca, Cereatti, A, Caliandro P (ORCID:0000-0002-1190-4879), Iacovelli C, Reale G, and Padua L (ORCID:0000-0003-2570-9326)

Abstract

The estimate of a consistent and clinically meaningful joint kinematics using wearable inertial and magnetic sensors requires a sensor-to-segment coordinate system calibration. State-of-the-art calibration procedures for the upper limb are based on functional movements and/or pre-determined postures, which are difficult to implement in subjects that have impaired mobility or are bedridden in acute units. The aim of this study was to develop and validate an alternative calibration procedure based on the direct identification of palpable anatomical landmarks (ALs) for an inertial and magnetic sensor-based upper limb movement analysis protocol. The proposed calibration procedure provides an estimate of three-dimensional shoulder/elbow angular kinematics and the linear trajectory of the wrist according to the standards proposed by the International Society of Biomechanics. The validity of the method was assessed against a camera-based optoelectronic system during uniaxial joint rotations and a reach-to-grasp task. Joint angular kinematics was found as characterised by a low-biased range of motion (<-2.6°), a low root mean square deviation (RMSD) (<4.4°) and a high waveform similarity coefficient (R2 > 0.995) with respect to the gold standard. Except for the cranio-caudal direction, the linear trajectory of the wrist was characterised by a low-biased range of motion (<11 mm) together with a low RMSD (8 mm) and high waveform similarity (R2 > 0.968). The proposed method enabled the estimation of reliable joint kinematics without requiring any active involvement of the patient during the calibration procedure, complying with the metrological standards and requirements of clinical movement analysis.

Published
2019

23. Mechanisms of head stability during gait initiation in young and older women:A neuro-mechanical analysis

Author

Maslivec, A., Bampouras, T. M., Dewhurst, S., Vannozzi, G., Macaluso, A., Laudani, L., Maslivec, A., Bampouras, T. M., Dewhurst, S., Vannozzi, G., Macaluso, A., and Laudani, L.

Abstract

Decreased head stability has been reported in older women during locomotor transitions such as the initiation of gait. The aim of the study was to investigate the neuro-mechanical mechanisms underpinning head stabilisation in young and older women during gait initiation. Eleven young (23.1 ± 1.1 yrs) and 12 older (73.9 ± 2.4 yrs) women initiated walking at comfortable speed while focussing on a fixed visual target at eye level. A stereophotogrammetric system was used to assess variability of angular displacement and RMS acceleration of the pelvis, trunk and head, and dynamic stability in the anteroposterior and mediolateral directions. Latency of muscle activation in the sternocleidomastoid, and upper and lower trunk muscles were determined by surface electromyography. Older displayed higher variability of head angular displacement, and a decreased ability to attenuate accelerations from trunk to head, compared to young in the anteroposterior but not mediolateral direction. Moreover, older displayed a delayed onset of sternocleidomastoid activation than young. In conclusion, the age-related decrease in head stability could be attributed to an impaired ability to attenuate accelerations from trunk to head along with delayed onset of neck muscles activation.

Published
2018

27. Assessing hopping developmental level in childhood using wearable inertial sensor devices.

Author

Masci I, Vannozzi G, Getchell N, Cappozzo A, Masci, Ilaria, Vannozzi, Giuseppe, Getchell, Nancy, and Cappozzo, Aurelio

Abstract

Assessing movement skills is a fundamental issue in motor development. Current process-oriented assessments, such as developmental sequences, are based on subjective judgments; if paired with quantitative assessments, a better understanding of movement performance and developmental change could be obtained. Our purpose was to examine the use of inertial sensors to evaluate developmental differences in hopping over distance. Forty children executed the task wearing the inertial sensor and relevant time durations and 3D accelerations were obtained. Subjects were also categorized in different developmental levels according to the hopping developmental sequence. Results indicated that some time and kinematic parameters changed with some developmental levels, possibly as a function of anthropometry and previous motor experience. We concluded that, since inertial sensors were suitable in describing hopping performance and sensitive to developmental changes, this technology is promising as an in-field and user-independent motor development assessment tool. [ABSTRACT FROM AUTHOR]

Published
2012

34. Comparison between two different types of instruments: an encoder and an inertial sensor device

Author

GATTA, GIORGIO, CORTESI, MATTEO, Zok M., Lanotte N., Vannozzi G., KJENDLIE P.L., STALLMAN L.K., CABRI J., Gatta G., Cortesi M., Zok M., Lanotte N., and Vannozzi G.

Abstract

The measurement and analysis of the kinematics of the swimmer is difficult and complex due to the environment in which it occurs. The research and development of new technologies aim to give the coach the opportunity to obtain more immediate information. In this work, the performances of two different instruments, that can be used as field tools by coaches, were compared.

Published
2010

35. Analysis of swim turning, underwater gliding and stroke resumption phases in top division Italian swimmers using a wearable inertial device

Author

Vannozzi G., Donati M., Cappozzo A., GATTA, GIORGIO, KJENDLIE P.L., STALLMAN L.K., CABRI J., Vannozzi G., Donati M., Gatta G., and Cappozzo A.

Abstract

Improving performance is a difficult task for élite swimmers. The study of turning, underwater gliding and stroke resumption kinematics may lead to the reduction of the relevant durations. Common video analysis is sometimes inadequate to investigate motor tasks. This work aimed at describing the mentioned phases in top division swimmers using a wearable inertial device. Eight élite swimmers were selected so as to cover all the four swimming styles. The device was positioned on the lower trunk and a 50m trial at the maximum velocity was executed. The angular velocity about each axis was post-processed and both time and kinematic parameters were extracted for each phase, characterizing each swimming style. Strength points of the approach are: simple description of the turning kinematics; possibility to extract performance-related parameters; simplicity of use for the operator; the minimal encumber for the athlete.

Published
2010

39. MA-MYO: A Software proposal for EMG signal processing and standardization in movement analysis

Author

CONFORTO, SILVIA, SCHMID, Maurizio, ZACCAGNA P, VANNOZZI G, D'ALESSIO T., MIDDLETON J., JONES M.L., SHRIVE N.G., PANDE G.N., Conforto, Silvia, Schmid, Maurizio, Zaccagna, P, Vannozzi, G, and D'Alessio, T.

Abstract

The aim of this work is the development and the fine tuning of a software package dealing with myoelectric signal processing for movement analysis. The rationale of this work arises from a twofold need: the importance of surface EMG (sEMG) data interpretation in movement analysis and the lack of standardization in signal processing procedures, in spite of a wide use of electromyographic techniques in clinical and research contexts. Therefore, a unified and standardized approach to the information extraction could increase the validity of quantitative assessment, often affected by operator subjective choices. The algorithms inserted in the package arise from the wide experience of the authors in sEMG data processing. The software was designed upon the Unified Modeling Language (UML) and developed by using a waterfall approach based on the tracing of requirements analysis and on interface specification. The design of interfaces was studied with particular attention to user-friendliness and to the insertion of the product in clinical routine environments, and the final product was tested on the basis of typical quality factors regarding object-oriented software.

Published
2003

40. Detection of discontinuities in vibration signals from mechanical systems

Author

CONFORTO, SILVIA, D'ALESSIO, Tommaso, Vannozzi G., Conforto, Silvia, D'Alessio, Tommaso, and Vannozzi, G.

Abstract

this paper an approach to the detection of discontinuities in signals from mechanical systems based on the use of wavelet transform is presented. Morlet wavelets have been used, by defining an automated procedure to detect phase and amplitude changes of the transform which can be related to variations of the statistical structure of the signals. The results obtained by processing synthetic signals which simulated possible fault conditions, and some first results with real signals are reported. It emerged that the method is capable of detecting the presence of typical discontinuities, and that is susceptible of an automated application.

Published
2000

42. Più fumonisine nel mais tardivo

Author

Berardo, N, Pisacane, V, Vannozzi, G. P., Baldini, M, Miele, S, Salera, Estilio, Marocco, A, Colombo, G, and Maggiore, T.

Published
2005

48. Disease history in 382 Italian patients with Crohn's disease

Author

Vannozzi G, Fontana R, Milla M, Ag, Bonanomi, Trallori G, Gabbrielli M, Pacini F, Gioacchino Leandro, and Morettini A

Subjects
Adult, Aged, 80 and over, Male, Reoperation, Adolescent, Incidence, Middle Aged, Cohort Studies, Survival Rate, Age Distribution, Crohn Disease, Italy, Recurrence, Risk Factors, Cause of Death, Humans, Female, Sex Distribution, Child, Aged, Follow-Up Studies, Retrospective Studies
Abstract

This large-scale study was aimed at evaluating the long-term history of Crohn's disease in a cohort of consecutive patients referred to the Careggi Hospital in Florence from January 1973 to June 1996.A total of 382 patients (187 females, 195 males; mean age of 47 years) were included in our study. The median follow-up was more than 11 years and only 46 patients (12%) had a follow-up of less than 1 year. The main endpoints evaluated in these patients included mortality for any cause, disease-specific mortality, recurrences, and need for surgery. Furthermore, in a subgroup of 130 patients observed during the last 6 months of our study, a more detailed assessment of the disease was carried out in which the distribution of inflammatory, fibrostenosing and fistulizing forms was determined.Our results showed that the disease-specific mortality rate was extremely low (around 3% at 10 years and 5% at 20 years), but the rate of recurrence was approximately 50% at 3 years and more than 60% at 6 years. Surgery was needed in more than 50% of the patients over the 10 years following diagnosis, and the risk of a second operation was of a further 30% within 4 years of the first operation.These epidemiological data emerging from our study are interesting since a large patient population was evaluated and the duration of the follow-up is extremely long.

Published
1998

49. P188 Need for colectomy in ulcerative colitis; a referral center cohort

Author

Settesoldi, A., primary, Manetti, N., additional, Genise, S., additional, Coppola, M., additional, Rogai, F., additional, Bagnoli, S., additional, Bonanomi, A.G., additional, Vannozzi, G., additional, Giannotta, M., additional, Cenci, C., additional, Santini, A., additional, Annese, V., additional, and Milla, M., additional

Published
2013
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