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

20:43 EDT 20th September 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+

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.


The Effect of Vibration Characteristics on the Atomization Rate in a Micro-Tapered Aperture Atomizer.

Because little is known about the atomization theory of a micro-tapered aperture atomizer, we investigated the vibration characteristics of this type of atomizer. The atomization mechanism of a micro-tapered aperture atomizer was described, and the atomization rate equation was deduced. As observed via microscopy, the angle of the micro-tapered aperture changes with the applied voltage, which proved the existence of a dynamic cone angle. The forward and reverse atomization rates were measured at various vol...

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...


Study on vibration sensing performance of an equal strength cantilever beam based on an excessively tilted fiber grating.

An equal strength cantilever beam vibration sensor based on an excessively tilted fiber grating (Ex-TFG) with light intensity demodulation is proposed. The basic principles and sensing characteristics of vibration sensing of an equal strength cantilever beam and Ex-TFG, the combination of which is applied into vibration sensing, are analyzed. An Ex-TFG is attached to the middle axis of an equal strength cantilever beam. As the vibration of a piezoelectric ceramic causes the equal strength cantilever beam to...

Dynamic cues for whisker-based object localization: An analytical solution to vibration during active whisker touch.

Vibrations are important cues for tactile perception across species. Whisker-based sensation in mice is a powerful model system for investigating mechanisms of tactile perception. However, the role vibration plays in whisker-based sensation remains unsettled, in part due to difficulties in modeling the vibration of whiskers. Here, we develop an analytical approach to calculate the vibrations of whiskers striking objects. We use this approach to quantify vibration forces during active whisker touch at a rang...

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...

Transmission of vibration from a vibrating plate to the head of standing people.

Little is known about the transmission of vibration to the head when using whole-body vibration (WBV) training machines. This paper investigates the effect of frequency and posture on the transmission of vibration from a vibrating plate to the head of standing people. Nine male participants were exposed to vertical vibration at nine frequencies in the range of 17-46 Hz and vibration acceleration in the range of 7.85-18.64 m/s(peak). The participants adopted four standing postures described as standing wit...

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...

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...

Muscular activity and acceleration of box vibration in manual holding tasks : Effects of load and height of the load's center of gravity.

This study recruited 14 participants to examine the effects of load and height of load's center of gravity (COG) on muscular activities of brachioradialis, biceps brachii, and erector spinae, and on box vibration acceleration (g) in manual holding tasks. Each participant was asked to hold a box in twelve conditions (four loads × three heights of the load's COG). The results showed that the muscular activities of brachioradialis, biceps brachii, and erector spinae significantly increased with load; however,...

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...

Average middle ear frequency response curves with preservation of curve morphology characteristics.

For the validation of modelling results or the comparison of middle ear interventions, such as prostheses placement, average responses of middle ear vibrations are needed. One such response is the amplitude and phase of the vibration of the stapes footplate as a function of frequency. Average responses and their standard deviation are commonly obtained by calculating the mean of a number of measured responses at each frequency. A typical middle ear magnitude response curve shows a number of distinct peaks, ...

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 ...

Receiver-Operating Characteristic Analysis of Eigen-Based Clutter Filters for Ultrasound Color Flow Imaging.

The eigen-based filter has theoretically established itself as a potent solution in ultrasound color flow imaging (CFI) for combating against clutter arising from moving tissues. Yet, it remains poorly understood on how much gain in flow detection sensitivity and specificity can be delivered by this adaptive clutter filter. Here, we investigated the receiver operating characteristic (ROC) of the eigen-based clutter filter to statistically evaluate its efficacy. Our investigation was conducted using a new va...

The Influence of Number Magnitude on Vocal Responses.

The study investigated whether number magnitude can influence vocal responses. Participants produced either short or long version of the vowel [ɑ] (Experiment 1), or high or low-pitched version of that vowel (Experiment 2), according to the parity of a visually presented number. In addition to measuring reaction times (RT) of vocal responses, we measured the intensity, the fundamental frequency (f) and the first and second formants of the vocalization. The RTs showed that the long and high-pitched vocal re...

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...

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....

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.

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-energy single-frequency 167  nm deep-ultraviolet laser.

We report a high-energy single-frequency deep-ultraviolet (DUV) solid-state laser at 167.079 nm by the eighth-harmonic generation of a diode-pumped Nd:LGGG laser. A maximum DUV laser output energy of 1.5 μJ at a 5 Hz repetition rate with a 200 μs pulse duration is achieved. The central wavelength of the DUV laser is located at 167.079 nm and can be finely tuned from 167.075 to 167.083 nm. The linewidth is estimated to be 0.025 pm. To the best of our knowledge, this is the first Letter reporting a h...


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