Academic literature on the topic 'Massage vibratoire'

Existing massagers are characterized by relatively high energy consumption during operation, the metal consumption of the structure, complexity of the drive mechanism. Therefore, the search for effective implementation schemes of mixing operations and uniform structure formation of viscous and elastic-plastic raw materials, in particular, minced meat, subject to increased contact interaction while minimizing the force on the products, is relevant to the conducted research. The purpose of this work is to substantiate the technological preparation modes of the given minced meat with the use of a developed vibrating massager, as well as to determine the kinematic parameters of the oscillation system and graphic-analytical analysis of their change. The experimental model of the vibrating massager with an eccentric drive mechanism, a measuring evaluation base of rheological characteristics of the minced ostrich meat, and kinematic parameters of the vibrating drive of the massager, in particular, amplitude-frequency and speed characteristics were developed to carry out the specified tasks. High technological results were obtained when using the forced eccentric drive of the massager, which is characterized by a minimum mass of the oscillation masses of the parts compared to traditional unbalanced vibrators, which allow reducing 2 - 2.5 times the energy consumption to drive the vibrating massager under study. The practical value of the conducted work includes the use of the eccentric forced vibrating exciter for obtaining the force control over the minced meat to be formed, which reduces the oscillation masses of the drive and minimizes the energy consumption for the process, accordingly; it has the simplest structure among the mechanical vibrators, significantly reduces the dynamic loads on the supporting units of the vibrator as well as provides a sufficiently high contact interaction for both the vibration impact and the processing intensity in general.

The Technology of Orgasm by Rachel Maines is one of the most widely cited works on the history of sex and technology. Maines argues that Victorian physicians routinely used electromechanical vibrators to stimulate female patients to orgasm as a treatment for hysteria. She claims that physicians did not perceive the practice as sexual because it did not involve vaginal penetration. The vibrator was, according to Maines, a labor-saving technology to replace the well-established medical practice of clitoral massage for hysteria. This argument has been repeated almost verbatim in dozens of scholarly works, popular books and articles, a Broadway play, and a feature-length film. Although a few scholars have challenged parts of the book, no one has contested her central argument in the peer-reviewed literature. In this article, we carefully assess the sources cited in the book. We found no evidence in these sources that physicians ever used electromechanical vibrators to induce orgasms in female patients as a medical treatment. The success of Technology of Orgasm serves as a cautionary tale for how easily falsehoods can become embedded in the humanities.

Our previous studies demonstrated a health improving effect in patients whom underwent an automatic vibratory massage. The results of our studies gave quantitative characteristics of physical effects produced by the automatic massage on the work of a human’s heart.

Background: Vibratory massage is now widely used to alleviate muscle fatigue. The effects of different vibration massage intensities on left and right upper trapezius (UT) fatigue have not been examined. Therefore, the present study first examined whether a vibration massage intervention had an effect on UT muscles and second compared the effects of 2 different levels (36 Hz and 46 Hz) of vibratory massage on the right and left oblique muscles under 3 different fatigue conditions. Methods: A total of 23 participants (12 female, 11 male; age: 26.5 ± 3.9 year, height: 170.5 ± 1.6 cm, mass: 57.5 ± 1.5 kg, BMI: 24.3 ± 1.6 kg/m2) were randomly divided into intervention and control groups. The 2 groups of subjects completed isometric contraction fatigue tasks of 30 s of fatigue, 60 s of fatigue and 90 s of fatigue in turn. The specific task of isotonic contraction was performed by subjects holding a 1 kg dumbbell in each hand and performing a straight arm weighted lateral supination exercise. After each exercise, the intervention group was randomized to apply a massage device with a vibration intensity of 36 Hz or 46 Hz on the left and right UT muscles for 5 min each. The control group did not receive any treatment. Both groups then repeated the same fatigue task as before. Then, the effects of different vibration massage interventions on UT muscles were derived by analyzing the changes in maximal voluntary contraction percentage (MVC%) of surface electromyography (sEMG) signals before and after the intervention, and the most effective vibration massage program for relieving left and right UT fatigue was summarized. Then, four classification algorithms were used to label and classify the collected sEMG data, and finally a UT muscle fatigue identification and vibration massage model was constructed. Results: After using the vibration massage level 1 (36 Hz) intervention, the MVC% of the right UT muscle showed significant reductions in the 30 s fatigue task, the 60 s fatigue task and the 90 s fatigue task (R1: p = 0.022, R2: p = 0.005, R3: p = 0.049). After using the vibration massage level 3 (46 Hz) intervention, the MVC% of the right UT muscle showed a significant decrease in both the 60 s fatigue task and the 90 s fatigue task (R2: p = 0.033, R3: p = 0.028). Significant decreases in MVC% for the left UT muscle were found only in the 90 s fatigue task (L3: p = 0.040). Then, by comparing the different performances of four commonly used classification algorithms, it was found that the bagging (accuracy = 0.860) algorithm had higher accuracy. Therefore, the bagging algorithm was used for the UT fatigue identification and vibration massage models. Conclusions: This was the first study to show the impacts of different levels of vibration massage on fatigue alleviation in the left and right UT muscles. Furthermore, the bilateral UT fatigue identification and vibration massage model developed in this study can help people to choose the most appropriate massage protocol for quick relief and relaxation of the UT muscles under three different fatigue tasks.

Les interfaces cerveau-ordinateur (ICOs) basées sur l'imagination motrice offrent des solutions prometteuses pour la rééducation motrice des patients après un accident vasculaire cérébrale (AVC). L'imagerie motrice kinesthésique (IMK) consiste à imaginer les sensations d'un mouvement, telles que la température, la pression, la rugosité, la contraction musculaire et l'activation nerveuse, plutôt que de visualiser le mouvement. Cependant, l'IMK ne comporte pas de retour sensoriel ou kinesthésique, ce qui rend cette tâche difficile à comprendre, à apprendre et à réaliser. Cette absence de retour d'information, ou feedback en anglais, restreint l'évaluation de la performance et l'orientation thérapeutique des patients post-AVC. Pour faire face à ce problème, un retour d'information est fourni aux patients et aux thérapeutes en fonction de la performance du patient. Diverses modalités de feedback ont été étudiées pour résoudre ce problème, notamment visuelles, la stimulation électrique fonctionnelle, les exosquelettes et les robots. Le feedback vibrotactile est une alternative peu explorée, qui vise à stimuler la peau et s'adresse aux patients avec une mobilité très réduite qui ne peuvent pas profiter des autres solutions. La combinaison des différents feedbacks est révélée comme une approche prometteuse pour fournir un retour d'information plus efficace et améliorer le processus de réadaptation. Le développement du feedback pour les ICOs a souvent donné la priorité au progrès technologique plutôt qu'aux considérations centrées sur le patient, ce qui a eu pour conséquence une adoption clinique limitée. Cette thèse adopte une nouvelle approche de recherche basée sur la conception (desing-based research en anglais, DBR), plaçant l'utilisateur au cœur du développement du système du retour d'information. L'objectif est de concevoir et d'évaluer un feedback vibrotactile, complémenté par un feedback visuel, et de l'intégrer à une ICO basée sur l'IMK pour améliorer la rééducation motrice post-AVC. Nous commençons par identifier les besoins et les objectifs des patients post-AVC qui suivent un entraînement par une ICO. Comme résultat, nous avons formulé l'hypothèse que le feedback bimodal (intégrant les modalités vibrotactiles et visuelles) peut améliorer l'IMK dans le contexte d'interaction avec une ICO. Le dispositif vibrotactile est ensuite construit en tenant compte des limitations anatomiques et physiques des patients post-AVC. Ensuite, la stimulation vibrotactile est construite en deux phases : établissement des seuils sensoriels de vibration pour trois groupes des âges différents et synchronisation d'un environnement visuel avec la stimulation vibrotactile. Différents modèles de vibration sont comparés pour déterminer celui qui correspond le mieux à l'animation graphique. La stimulation a été conçue en s'inspirant de l'activation des muscles lors d'un mouvement de préhension. Après la validation de la stimulation, l'ICO est évaluée auprès d'un groupe de participants neurotypiques afin de mesurer l'efficacité, l'utilisabilité et la fiabilité du système. Trois modalités de feedback (vibrotactile, visuelle, bimodal — vibrotactile et visuelle) sont comparées pour évaluer leur efficacité à soutenir l'exécution de l'IMK. Cette recherche met en évidence le potentiel d'une approche centrée sur l'utilisateur pour développer des solutions de feedback qui améliorent l'IMK et la rééducation. Un protocole expérimental est présenté pour une future étude chez les patients post-AVC afin d'évaluer l'acceptabilité et l'utilisabilité de l'ICO avec un feedback bimodal méticuleusement conçu. Les résultats de ce travail offrent les basses pour l'application de notre ICO dans la pratique clinique, avec le potentiel de bénéficier les patients post-AVC
Motor imagery-based brain-computer interfaces (BCI) offer promising solutions for post-stroke motor rehabilitation. Kinesthetic motor imagery (KMI) consists of imagining the sensations of a movement (such as temperature, pressure, roughness, muscular contraction, and nerve activation) rather than visualizing the movement. However, KMI lacks sensory or kinesthetic feedback, making this task challenging to understand, learn, and perform. This absence of feedback hinders performance evaluation and therapeutic guidance for post-stroke patients. To address this issue, feedback is provided to both patients and therapists, based on the patient's performance. Various feedback modalities, including visual, functional electrical stimulation, exoskeletons, and robotic assistance, have been explored to bridge this gap. Vibrotactile feedback is an underexplored alternative, that offers skin stimulation, targeting patients with limited mobility. Combining different feedback modalities has emerged as a promising approach to provide more effective feedback and enhance the rehabilitation process. The development of BCI feedback has often prioritized technological advancement over patient-centric considerations, resulting in limited clinical adoption. This thesis adopts a novel design-based research (DBR) approach, placing the user at the core of feedback system development. The objective is to design and evaluate vibrotactile feedback, complemented with visual feedback and integrated it with a KMI-based BCI to improve post-stroke motor rehabilitation. We start by identifying the needs and objectives of patients undergoing BCI training, leading to the hypothesis that bimodal feedback (combining vibrotactile and visual modalities) can enhance KMI within the BCI context. We tailor the vibrotactile stimulation to provide precise sensory feedback during grasping KMI. The vibrotactile device is then built considering the anatomical and physical limitations of post-stroke patients. Then, the vibrotactile stimulation is built in two phases: establishing vibration sensory thresholds for age-dependent groups and synchronizing a visual environment with vibrotactile stimulation. Different vibration patterns are compared to determine the one that better corresponds to the graphic animation. The stimulation was designed, drawing inspiration from the natural muscle activation of the muscles during grasping. Following the validation of the stimulation, the BCI is assessed with a group of neurotypical participants to measure its efficacy in improving KMI and evaluate its acceptability, usability, and reliability. Three feedback modalities (vibrotactile, visual and bimodal - vibrotactile and visual) are compared to determine their effectiveness. This research highlights the potential of a user-centered approach for developing feedback solutions that enhance motor imagery and rehabilitation outcomes. Furthermore, an experimental protocol is presented for future studies with post-stroke patients to assess the acceptability and usability of the meticulously designed BCI with bimodal feedback. The findings of this work lay the foundation for translating the resulting BCI into practical clinical applications, ultimately benefiting post-stroke patients

Nell’ambito della medicina riabilitativa, si sta affermando sempre più l’applicazione terapeutica di vibrazioni meccaniche nel trattamento di specifiche patologie cliniche e nel settore della riabilitazione sportiva. L’esposizione alle vibrazioni può avere sull’organismo effetti positivi o negativi in funzione del tipo d’oscillazione e della durata dell’esposizione stessa. Le vibrazioni meccaniche, se applicate per periodi d’esposizione ridotti e frequenze d’oscillazione dell’ordine di 15-50 Hz, non solo non comportano alcun effetto negativo a livello organico, ma al contrario possono indurre adattamenti positivi del corpo umano. Il corpo umano però non vibra come una massa unica con un’unica frequenza naturale, ma ogni sua componente ha la propria frequenza di risonanza, il che provoca un’amplificazione o attenuazione delle vibrazioni di input da parte di ogni segmento corporeo. Per questo motivo è necessario porre particolare attenzione alla modalità di trasmissione delle vibrazioni meccaniche al corpo umano: queste difatti, se applicate all’intero corpo in maniera troppo aspecifica (Whole Body Vibration), hanno un effetto che non sempre risulta benefico. Ecco perché è di primaria importanza localizzare le suddette vibrazioni ad un segmento corporeo ben preciso e focalizzarne il più possibile l’effetto nella zona di interesse. Pertanto nel presente lavoro si sono esaminate le modalità con le quali tradurre l’esigenza medica di avere a disposizione un dispositivo dedicato all’applicazione localizzata di vibrazioni meccaniche controllate in ambito clinico, in linguaggio scientifico-ingegneristico, cercando di produrne una soluzione progettuale. In collaborazione con la ditta Boscosystemlab, impegnata nel settore della produzione di dispositivi per la riabilitazione e l’allenamento fisico, si è ideato ed implementato un prototipo specifico per l’applicazione clinica di vibrazioni locali al corpo umano. L’apparecchio implementato rende ergonomica l’applicazione locale delle vibrazioni, è “auto-applicabile al paziente”, protegge l’operatore clinico dalle sollecitazioni vibratorie applicate al paziente ed è di agevole utilizzo. Dopo aver implementato il nostro dispositivo, abbiamo verificato che la somministrazione delle sollecitazioni meccaniche erogate da esso ed applicate sul corpo producessero degli effetti oggettivamente rilevabili, effettuando misure elettromiografiche di superficie, analizzando il comportamento dei muscoli a riposo e durante l’applicazione su di essi delle vibrazioni prodotte dal prototipo, rilevando una risposta muscolare maggiore nel secondo caso. Successivamente si è posta in essere una reale indagine clinica basata su sperimentazioni effettuate sul campo. In collaborazione con il Programma Aziendale di Medicina Fisica e Riabilitazione Ambulatoriale della Fondazione Policlinico Tor Vergata di Roma si è somministrato l’Esercizio Terapeutico Vibratorio (ETV), utilizzando il nostro dispositivo, ad un paziente con frattura della tibia destra con ritardo di consolidazione o pseudoartrosi. Le immagini radiologiche in itinere e la successiva analisi mediante l’introduzione dell’Indice di Massa Ossea (IMO) ci inducono ad affermare che la terapia vibratoria applicata con il prototipo, contribuisce in maniera decisiva alla terapia di quei quadri patologici che si presentano con disturbi della formazione del callo osseo, riuscendo a risolvere il ritardo di consolidazione, riducendo notevolmente i tempi di recupero del paziente; non è da trascurare inoltre il miglioramento indotto sullo stesso in merito alla sintomatologia parestesica ed alla risoluzione dell’edema perilesionale. L’obiettivo seguente è stato quello di verificare l’effetto delle vibrazioni a livello metabolico sul muscolo di applicazione. In quest’ottica abbiamo deciso di utilizzare un ossimetro tissutale, installato presso l’Ospedale Fatebenefratelli dell’Isola Tiberina di Roma, in grado di rilevare l’andamento delle concentrazioni di Hb e HbO2, facendo uso della NIRS (Near InfraRed Spectroscopy). Effettuando delle misure durante l’applicazione dell’ETV, è stato possibile ricavare informazioni inerenti l’attività metabolica muscolare nella zona trattata (il bicipite destro nelle nostre misure). Analizzando gli andamenti ottenuti da queste misurazioni si rileva una variazione della concentrazione di emoglobina totale, ossigenata, e non ossigenata e della percentuale di saturazione di ossigeno: in particolare per quel che concerne l’emoglobina ossigenata si riscontra un aumento della sua concentrazione. Ulteriori misurazioni ci rivelano che sebbene le variazioni di concentrazione dell’emoglobina possano essere provocate in parte da un aumento di temperatura superficiale, anche le stesse vibrazioni meccaniche inducono variazioni rilevanti.
In Rehabilitation Medicine, therapeutic application of vibration energy in specific clinical treatments and in sport rehabilitation is being affirmed more and more. Vibration exposure can have positive or negative effects on the human body, depending on the features and time of the characterizing wave. Short periods of vibration exposure and specific frequency values can determine positive adjustments of human body. Human body doesn’t vibrate like a unique body, but every element regarding its own resonance frequency can cause an amplification or attenuation of the vibrations applied. This is the reason why vibration application mechanisms are crucial: if applied in non specific way, Whole Body Vibration (WBV) treatments could have non positive effects. In order to focus the effect of vibration in the specific treatment area, local vibrations (LV) have been introduced in rehabilitation medicine. The initial aim of the present study was to translate the medical necessity of applying local vibration in clinical treatments into scientific-engineering language, producing a design solution. In collaboration with Boscosystem Company, a manufacturer of rehabilitation medicine and sport training devices, we have produced a specific prototype for LV application on human body. The device is user friendly, “auto-applicable” to the patient, it preserves clinical operator from vibration stress and it makes LV applications ergonomic. Then, we have tested our prototype, verifying that the vibration produced by it and applied on human body has objectively detectable effects, analyzing the behaviour of muscles in rest time and under vibration energy, by using surface electromyography, obtaining a greater response in the second scenary. Subsequently, a real clinical inquiry was made about the device effectiveness and its clinical use on patients. To achieve this goal, in collaboration with the Company Program of Physical Medicine and Day-Hospital Rehabilitation of Policlinico Tor Vergata in Rome, we have applied therapeutic exercise by vibration (TEV) produced by our device on a male patient with a non-union right tibial fracture. In itinere radiological images and Bone Mass Index analysis allow us to state that TEV, made by using our device, contributes decisively to the therapy of pathologies concerning disorders of bone callous forming, resolving the consolidation delay, reducing patient healing time; moreover it isn’t negligible the improvement induced on the patient, as far as paraesthetic symptomatology and reduction of perilesion edema are concerned. The next target of our study was the inquiry of TEV metabolic effects on the application muscle. So, we have used a Tissue Oximeter installed at Fatebenefratelli Isola Tiberina Hospital in Rome, that is able to detect Hb and HbO2 concentration trend, by using NIRS (Near InfraRed Spectroscopy). By making measurements during TEV application, it was possible to obtain information about metabolic activity in the treated area (biceps in our case). By analyzing Hb and HbO2 trends, we have shown a variation of total Hemoglobine, of oxygenated and non-oxygenated Hemoglobine and of oxygen saturation: in particular, we have shown an increase of oxygenated Hemoglobine. More measurements revealed us that, although Hemoglobine concentration increase could be partially caused by temperature rise, Local Vibrations themselves induce sensible variations.

Shaker table vibration testing is nothing new for electronic components. Such environmental tests are most often conducted in a sequential uniaxial setup, where the test article is sequentially rotated and excited along three different orthogonal orientations. While sequential axis testing does excite modes in all three directions sequentially, it does not quantify or qualify how modes along different axes interact with one another when excited simultaneously. Traditional linear dynamics does not predict any cross-axis interactions between different spectral modes in vibrating structures, but this has long been suspected to be an oversimplification for many cases. The authors demonstrated this in a previous experiment, in which printed wiring assemblies (PWAs) of the same design were subjected to sequential uniaxial and simultaneous biaxial excitations. Boards undergoing bi-axial excitation suffered fatigue damage accumulation rates much higher than the superposition of damage rates from sequential uniaxial tests. Even as far back as 2010, the military added multi degree of freedom (MDoF) vibration tests to their 810G standard — so MDoF testing is rapidly gaining traction in the accelerated stress testing community. The cost of performing MDoF vibration durability testing can be significant, so an important technical issue turns into identifying when MDoF testing is necessary, and when single degree of freedom (SDoF) testing is sufficient. This study addresses this issue using a combination of mathematical models and FEA simulations. It is intuitively obvious that larger and more massive circuit components are more susceptible to these nonlinear cross-axis interactions, especially as the excitation levels become significant; however our long term goal is to quantify the effects of such parameters on the nonlinear interactions. The focus of the study is a simple beam with a tip mass — representing a circuit component with leads for mounting to the printed wiring board (PWB). The study also considers the effect of the PWB dynamics on the mechanical response of the circuit element, as it undergoes worst case excitation. The effects of several parameters are investigated, including component properties (e.g. mass, and height) as well as bi-axial excitation conditions (eg. frequency, relative phase and amplitude).

Abstract Test fixtures are widely used in industry for quality control to determine the potential of a product to make excessive noise. Since acceptable parts may be rejected unnecessarily, or noisy parts may be passed if the test is inaccurate, it is desirable to have a reliable test setup, including the test fixture. When the part being tested is a motor and gearbox, and the test measurement is vibration, the vibratory response may vary significantly, depending on exactly how the motor and gear tones line up with the test fixture resonances. This potential for variability has led to vibration test fixtures being designed to be as precise as possible, so that the construction of the test fixture can be repeated from one application to the next. However, such an approach has led to rather stiff and massive designs, with few resonant modes, with the result that the repeatability of the measurements can be affected by rather small variations in motor speed and mounting conditions. A similar situation in acoustics leads to the use of reverberation chambers with rotating diffusers. This paper describes an investigation into the possibility of employing a vibration analog to the reverberant room as a test fixture, in order to make vibration measurements on a production line more reliable. The fixture is a plate, sized to achieve a higher modal density than exists in a typical test fixture. The geometry, edge restraints and interior loads are varied, either through analysis or experiments, to produce a variability of response to be averaged over during the data analysis period. Our conclusion is that the reverberant plate test fixture is able to reduce the variability of vibrational response in comparison to a more standard test fixture.