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PubMed Journals Articles About "Low-magnitude High-frequency Vibration Study On Fracture Rate In Community Elderly" RSS

10:42 EST 17th November 2018 | BioPortfolio

Low-magnitude High-frequency Vibration Study On Fracture Rate In Community Elderly PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Low-magnitude High-frequency Vibration Study On Fracture Rate In Community Elderly articles that have been published worldwide.

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Showing "magnitude High frequency Vibration Study Fracture Rate Community" PubMed Articles 1–25 of 88,000+

Subjective discomfort caused by vertical whole-body vibration in the frequency range 2-100 Hz.

Current standards assume the same frequency weightings for discomfort at all magnitudes of vibration, whereas biodynamic and psychological studies show that the frequency-dependence of objective and subjective responses of the human body depends on the magnitude of vibration. This study investigated the discomfort of seated human body caused by vertical whole-body vibration over the frequency range 2-100 Hz at relatively high magnitudes from 1.0 to 2.5 ms r.m.s. Twenty-eight subjects (15 males and 13 fe...


Modulation of Cortical Activity Induced by High-Frequency Whole-body Vibration Exercise: An fNIRS Study.

Whole-body vibration (WBV) has shown many positive effects on the human body in rehabilitation and clinical settings in which vibration has been used to elicit muscle contractions in spastic and paretic muscles.

Whole body vibration of different frequencies inhibits H-reflex but does not affect voluntary activation.

This study aimed to investigate the effects of whole-body vibration (WBV) at a frequency spectrum from 20 to 50 Hz on the Hoffmann (H) reflex and the voluntary motor output of ankle plantar-flexor muscles. A single-group (n: 8), repeated measures design was adopted with four conditions: standing (no vibration), 20, 35 and 50 Hz, each lasting one minute. H-reflex of the soleus muscle, maximal voluntary contraction (MVC) and central activation ratio (CAR) of the plantar-flexors were evaluated before, 1 an...


Transforming growth factor beta 1 mediates the low-frequency vertical vibration enhanced production of tenomodulin and type I collagen in rat Achilles tendon.

Vertical vibration (VV) is a whole-body vibration with mechanical loading that commonly used in rehabilitation and sports training to increase athlete muscle strength. Our previous study showed that low-magnitude, low-frequency VV at 8 Hz and 10 Hz increased myoblast myogenesis. Herein, we investigated whether a VV frequency at low-frequency 5-10 Hz has anabolic effects on tenocytes and improves tendon stiffness. In primary tenocytes, 10 Hz VV treatment increased the tenogenic marker gene expression of teno...

Ultrahigh-resolution optical vector analysis using fixed low-frequency electrical phase-magnitude detection.

An ultrahigh-resolution optical vector analyzer (OVA) is proposed and experimentally demonstrated based on microwave photonic frequency downconversion and fixed low-frequency electrical phase-magnitude detection. In the proposed OVA, two optical single-sideband (OSSB) signals are generated by two RF signals with a fixed frequency spacing. One propagates through an optical device under test (DUT) and is then combined with the other before entering to a low-speed photodetector. By photodetection, a low-freque...

A Novel Well Drill Assisted with High-Frequency Vibration Using the Bending Mode.

It is important for companies to increase the efficiency of drilling as well as prolong the lifetime of the drilling tool. Since some previous investigations indicated that a superposition of well drilling with an additional vibration increases the drilling efficiency, this paper introduces a novel well drill which is assisted with additional vibrations by means of piezoelectric sandwich bending vibration transducer. The proposed drill uses bending vibrations in two different directions to from an elliptica...

The influence of leaping frequency on secondary bone in cercopithecid primates.

Bone remodeling is at least partially mediated by the mechanical environment created by an animal's behavior. Here, we test the hypothesis that bone remodeling is primarily induced by high magnitude loads, likely encountered during leaping/bounding behaviors. Osteon population density (OPD), osteon cross-sectional area (On.Ar), and relative osteonal area (%HAV) were measured from femoral and humeral midshaft thin sections of four cercopithecids (N = 5 per species) from Taï Forest, Côte d'Ivoire: Colobus...

Dynamics of nanodroplets on vibrating surfaces.

We report the results of molecular dynamics investigations into the behaviour of nanoscale water droplets on surfaces subjected to cyclic-frequency normal vibration. Our results show, for the first time, a range of vibration-induced phenomena, including the existence of the following different regimes: evaporation, droplet oscillation, and droplet lift-off. We also describe the effect of different surface wettabilities on evaporation. The outcomes of this work can be utilised in the design of future nano-en...

Focal Vibration Stretches Muscle Fibers by Producing Muscle Waves.

Focal vibration is an effective intervention for the management of spasticity. However, its neuromechanical effects, particularly how tonic vibration reflex is induced explicitly, remain implicit. In this paper, we utilize a high-speed camera and a method of image processing to quantify the muscle vibration rigorously and disclose the neuromechanical mechanism of focal vibration. The vibration of 75 Hz is applied on the muscle belly of the biceps brachii and muscle responses are captured by a high-speed cam...

Iliac and mandible osteoblasts exhibit varied responses to LMHF vibration.

The facial bones and long bones have distinct developmental origins, structures and cellular compositions. This study aimed to compare the in vitro responses of human mandible and long bone osteoblasts to low-magnitude, high-frequency (LMHF) mechanical vibration in terms of expression of mediators of bone remodeling. Osteoblast-like cell cultures were prepared from iliac crest and mandibular bone specimens from three individuals and cultured in osteogenic induction media. Induction of mature osteoblastic ph...

Laser-Induced Microsphere Hammer-Hit Vibration in Liquid.

We demonstrate a new principle of the laser-induced hammer-hit vibration of a micron-sized black sphere in liquid glycerol with a single divergent Gaussian beam. The light-induced Δα-photophoretic force, which is significantly improved by the vibrating speed of the microparticle, is responsible for both the pushing and pulling force of the hammer-hit vibration. Our approach expands the optical manipulation of microparticle hammer-hit vibration to a liquid medium and provides full control over the trapped ...

Vagal Mediation of Low Frequency Heart Rate Variability During Slow Yogic Breathing.

Changes in heart rate variability (HRV) associated with breathing (respiratory sinus arrhythmia [RSA]) are known to be parasympathetically (vagally) mediated when the breathing rate is within the typical frequency range (9-24 breaths/min; high frequency HRV). Slow yogic breathing occurs at rates below this range and increases low frequency HRV power, which may additionally reflect a significant sympathetic component. Yogic breathing techniques are hypothesized to confer health benefits by increasing cardiac...

In-phase and Quadrature Analysis for Amplitude and Frequency Modulation Due to Vibrations on a Surface Acoustic Wave Resonator.

Surface acoustic wave resonators (SAWR) have found widespread usage in various modern consumer radiofrequency (RF) communications electronics, such as cellular phones, wireless devices, GPS devices, frequency control, and sensing applications. External mechanical vibrations modify a SAWR relative dimensions and the substrate's elastic properties, which alter the device's acoustic wave propagation velocity, and ultimately causes the SAWR RF response to change. Detecting vibrations is desirable for dynamic st...

Comparison of Single-Session Dose Response Effects of Whole Body Vibration on Spasticity and Walking Speed in Persons with Spinal Cord Injury.

Spasticity affects approximately 65% of persons with spinal cord injury (SCI) and negatively impacts function and quality of life. Whole body vibration (WBV) appears to reduce spasticity and improve walking function; however, the optimal dose (frequency/duration) is not known. We compared single-session effects of four different WBV frequency/duration dose conditions on spasticity and walking speed, in preparation for a planned multi-session study. Thirty-five participants with motor-incomplete SCI received...

Distributed fiber sparse-wideband vibration sensing by sub-Nyquist additive random sampling.

The round-trip time of the light pulse limits the maximum detectable vibration frequency response range of phase-sensitive optical time domain reflectometry (ϕ-OTDR). Unlike the uniform laser pulse interval in conventional ϕ-OTDR, we randomly modulate the pulse interval so that an equivalent sub-Nyquist additive random sampling (sNARS) is realized for every sensing point of the long interrogation fiber. For a ϕ-OTDR system with 10 km sensing length, the sNARS method is optimized by theoretical analysis ...

Finding Parameters around the Abdomen for a Vibrotactile System: Healthy and Patients with Parkinson's Disease.

Freezing of Gait (FOG) is one of the most disabling gait disorders in Parkinson's Disease (PD), for which the efficacy of the medication is reduced, highlighting the use of non-pharmacological solutions. In particular, patients present less difficulties in overcoming FOG when using feedback and especially with Biofeedback Systems. In this study it is intended to detect the frequency threshold and the minimum interval of perception of the vibrotactile feedback, through a proposed wearable system, a waistband...

High reward enhances perceptual learning.

Studies of perceptual learning have revealed a great deal of plasticity in adult humans. In this study, we systematically investigated the effects and mechanisms of several forms (trial-by-trial, block, and session rewards) and levels (no, low, high, subliminal) of monetary reward on the rate, magnitude, and generalizability of perceptual learning. We found that high monetary reward can greatly promote the rate and boost the magnitude of learning and enhance performance in untrained spatial frequencies and ...

Women with fracture, unidentified by FRAX, but identified by cortical porosity, have a set of characteristics that contribute to their increased fracture risk beyond high FRAX score and high cortical porosity.

The Fracture Risk Assessment Tool (FRAX) is widely used to identify individuals at increased risk for fracture. However, cortical porosity is associated with risk for fracture independent of FRAX and is reported to improve the net reclassification of fracture cases. We wanted to test the hypothesis that women with fracture who are unidentified by high FRAX score, but identified by high cortical porosity, have a set of characteristics that contribute to their fracture risk beyond high FRAX score and high cor...

A vibration analysis of a cracked micro-cantilever in an atomic force microscope by using transfer matrix method.

In this paper, the effects of crack size and its location have been investigated on the free vibration of an atomic force microscopy (AFM) cantilever applying transfer matrix method. By modeling the crack as a torsional spring and considering the boundary conditions at the contact point with sample's surface, the AFM cantilever vibration behavior has been formulated. Afterwards, the characteristic equation has been derived applying the transfer matrix. At the end, the effects of crack size and its location ...

The limitations of using simple definitions of glucocorticoid exposure to predict fracture risk: A cohort study.

To evaluate the effects of different definitions of glucocorticoid (GC) exposure on the magnitude and pattern of fracture risk using the same dataset.

Enhancement in mechanical quality factors of poly phenylene sulfide under high-amplitude ultrasonic vibration through thermal annealing.

Our previous study shows that poly phenylene sulfide (PPS) provides relatively high mechanical quality factors (Q factors) at ultrasonic frequency compared to other commonly-used functional polymers, and has potential as the vibrating body of a functional ultrasonic transducer. Since PPS has semicrystalline frameworks, its Q factors may be enhanced through thermal annealing. Prior to examining this feasibility, we developed a method for estimating Q factors under high-amplitude longitudinal vibration. Q fac...

Adding vibration to high-intensity intervals increase time at high oxygen uptake in well-trained cyclists.

The importance of accumulated time ≥90% of maximal oxygen consumption (VO ) to improve performance in well-trained endurance athletes is well established. The present study compared the acute effects of adding vibrations (VIB; 40 Hz) to the work intervals during a high-intensity cycling session (HIT) with a traditional HIT session without vibration (TRAD) on time ≥90% of VO , time ≥90% of peak heart rate (HR ), electromyography (EMG) activity and mean power in well-trained cyclists (n=10, VO =78.6±7....

ANITA-An active vibration cancellation system for scanning probe microscopy.

The high sensitivity of scanning probe microscopes poses a barrier to their use in noisy environments. Vibrational noise, whether from structural or acoustic sources, can manifest as relative motion between the probe tip and sample, which then appears in the probe position ("Z") feedback as it tries to cancel this motion. Here we describe an active cancellation process that nullifies the appearance of this vibration by adding a drive signal into the existing Z-feedback loop. The drive is digitally calculate...

High Frequency Autonomic Modulation: a new model for analysis of autonomic cardiac control.

Increase in high-frequency (HF) beat-to-beat heart rate oscillations by torsadogenic hERG blockers appears to be associated with signs of parasympathetic and sympathetic co-activation which cannot be assessed directly using classic methods of heart rate variability (HRV) analysis. The present work aimed to find a translational model that would allow this particular state of heart rate autonomic control to be assessed.

Cardiorespiratory responses in different types of squats and frequencies of Whole-Body Vibration in patients with Chronic Obstructive Pulmonary Disease.

This study aims to investigate the cardiorespiratory responses to different vibration frequencies to characterize the intensity of exercise, as well as to compare the effect of two types of squatting exercises (static and dynamic) on the Whole-Body Vibration (WBV) exercise in individuals with chronic obstructive pulmonary disease (COPD). Twenty-six subjects were divided and paired into healthy and COPD groups that performed static squatting associated with WBV (frequencies: 30, 35 and 40 Hz; amplitude: 2 mm...


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