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"Vibration Physiological effect."
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Effects of vibration therapy for post-stroke spasticity: a systematic review and meta-analysis of randomized controlled trials
Background
The efficacy of vibration therapy (VT) in people with post-stroke spasticity (PSS) remains uncertain. This study aims to conduct a comprehensive meta-analysis to assess the effectiveness of VT in PSS.
Methods
PubMed, Embase, Cochrane Library, Physiotherapy Evidence Database, and Web of Science were searched from inception to October 2022 for randomized controlled trials (RCTs) of VT in people with PSS. The primary outcome was spasticity, and secondary outcomes included pain, motor function, gait performance, and adverse events. A meta‑analysis was performed by pooling the standardized mean difference (SMD) with 95% confidence intervals (CI).
Results
A total of 12 studies met the inclusion criteria. Overall, VT had significant effects on reducing spasticity (SMD = − 0.77, 95% CI − 1.17 to − 0.36,
P
< 0.01) and pain (SMD = − 1.09, 95% CI − 1.74 to − 0.45,
P
< 0.01), and improving motor function (SMD = 0.42, 95% CI 0.21 to 0.64,
P
< 0.01) in people with PSS. However, VT had no significant effect on gait performance (SMD = − 0.23, 95% CI − 0.56–0.10). In addition, subgroup differences in short-term anti-spasticity effects between different vibration subtypes, vibration frequencies, vibration durations, frequency of sessions, control therapy, spasticity distribution, and population classification were not significant.
Conclusion
We found that VT significantly alleviated spasticity and pain in people with PSS and improved motor function, but its effect on gait performance was unclear. However, further studies are needed to validate these findings.
Journal Article
Acute effects of vibration foam rolling and local vibration during warm-up on athletic performance in tennis players
Athletes are currently fond of vibration foam rollers (VFRs) and commercial portable vibration percussion devices (PVPDs). It is still unknown whether using these devices during warm-up has an immediate impact on athletic performance. A randomized block design was used in this study. The acute effects of VFR and PVPD on tennis players’ athletic performance during warm-up were compared. For the countermovement jump (CMJ), reactive strength index (RSI), and hexagon test (HT), the difference in performance between all interventions was significant (p = 0.007–0.034, η 2 p = 0.266–0.364). Only those who received VFR had significantly different CMJ and HT results when compared to the control group (CMJ height = 53.18 ±4.49 cm, p = 0.03, d = 1.26; HT time = 10.73 ±0.4 s, p = 0.03, d = 1.12). Participants’ RSI values were significantly different after VFR (RSI = 2.01 ±0.11 cm·mm –1 , p = 0.012, d = 1.76) and PVPD (RSI = 1.99 ±0.11 cm·mm –1 , p = 0.025, d = 1.52) compared to the control group. Therefore, when using VFR and PVPD as part of warm-up protocols for tennis players of varying skill levels, VFR could have an immediate positive effect on power, reactive strength, and change of direction performance, while PVPD could immediately improve reactive strength performance.
Journal Article
Effectiveness and Physiological Safety of a Lung Vibration Device for Airway Clearance in Patients with Sputum Retention: A Randomized Crossover Study
Lung vibration is a chest physiotherapy technique used to facilitate sputum mobilization and improve airway clearance; however, its effectiveness may vary due to therapist-dependent factors. This study developed a lung vibration device and evaluated its effectiveness in patients with sputum retention. Twenty-five patients, aged ≥18 years with sputum retention, including those with bronchiectasis, pneumonia, and COPD-related conditions, participated in a randomized crossover trial and received two single interventions in random order: a conventional intervention (manual percussion, manual vibration, and suction) and an experimental intervention (manual vibration replaced by the device). Sputum volume and quality, rating of perceived dyspnea (RPD), peripheral oxygen saturation (SpO2), cardiovascular dynamics, respiratory rate, and body temperature were assessed before and immediately after each intervention. Sputum volume was significantly higher following the experimental intervention compared with the conventional intervention (p = 0.010). No significant between-intervention differences were observed in sputum quality, RPD, SpO2, cardiovascular parameters, respiratory rate, or body temperature (all p > 0.05). No potential adverse effects were reported. These findings suggest that the lung vibration device enhances sputum clearance in the short term, with no immediate adverse physiological effects observed, and may serve as a practical alternative to manual vibration.
Journal Article
Frequency-Range-Specific Hand–Arm Vibration Exposure and the Risk of Musculoskeletal Disorders of the Upper Extremities: The German Hand–Arm Vibration Study
To quantify the effect of frequency-range-specific hand–arm vibration (FRS-HAV) exposure on the risk of musculoskeletal disorders of the upper limb (UMSDs), we performed an analysis among the study sample of the German Hand–Arm Vibration Study. In total, 206 cases and 609 controls were included in this analysis. Cases were new patients with UMSDs. Controls were a random sample of people with compensable occupational injuries. Standardized personal interviews were performed among cases and controls. In addition to leisure activities and comorbidities, detailed work histories were obtained from all participants. To quantify FRS-HAV exposures, a database of vibration measurements of over 700 power tools was used. This database allows detailed quantification of vibration exposure over long periods of time. A dose–response relationship between FRS-HAV exposure and UMSDs was quantified using conditional logistic regression analyses. After adjustment for relevant confounders, consistent and statistically significant exposure–response relationships were observed between cumulative vibration exposure and UMSDs. The effect of vibration exposure on the risk of UMSDs is mainly concentrated in the frequency range ≤ 50 Hz. This suggests that the current ISO frequency-weighting curve for quantifying hand–arm vibration exposure is reasonable and can be used for vibration-related risk assessment, especially for musculoskeletal disorders.
Journal Article
Gender and Anthropometric Effects on Seat-to-Head Transmissibility Responses to Vertical Whole-Body Vibration of Humans Seated on an Elastic Seat
This study investigated the effects of gender and ten different anthropometric parameters on the vertical vibration transmission from seat to the head of the body seated on an elastic seat. The seat-to-head transmissibility (STHT) responses in the vertical and fore-aft directions of 58 participants (31 males and 27 females) were measured under three levels of vertical vibration (root mean square acceleration: 0.25, 0.50, and 0.75 m/s2) in the 0.50–20 Hz range, when sitting on a viscoelastic seat with and without a vertical back support, and with hands on a steering wheel. Apart from the important effects of elastic coupling between the body and seat, the results show distinctly different vertical and fore-aft STHT responses from the two genders. Moreover, the gender effect was strongly coupled with back support and excitation conditions. The primary resonance frequencies of male subjects were higher than those of female subjects, while the peak vertical STHT magnitudes were comparable. Owing to the strong coupled effects of gender and anthropometric dimensions, the study is designed to reduce the coupling by considering datasets for subjects with comparable chosen dimensions. Among the various anthropometric dimensions considered, the body mass and fat mass revealed strong influences on the primary resonance frequency, which was similar for male and female subjects with comparable body mass index and body fat mass. The vertical STHT magnitude of the two genders with the same lean body mass was also nearly identical. The peak fore-aft STHT magnitudes of the male subjects were notably higher than those of the female subjects with comparable anthropometric dimensions with the exception of the body mass.
Journal Article
In vitro mechanical vibration down-regulates pro-inflammatory and pro-fibrotic signaling in human vocal fold fibroblasts
Voice rest following phonotrauma or phonosurgery has a considerable clinical impact, but clinical recommendations are inconsistent due to inconclusive data. As biopsies of the vocal folds (VF) for molecular biology studies in humans are unethical, we established a new in vitro model to explore the effects of vibration on human vocal fold fibroblasts (hVFF) in an inflammatory and normal state, which is based on previously published models.
By using a phonomimetic bioreactor we were able to apply predefined vibrational stress patterns on hVFF cultured under inflammatory or normal conditions. Inflammatory and pro-fibrotic stimuli were induced by interleukin (IL)1β and transforming growth factor (TGF)β1, respectively. Mechanical stimulation was applied four hours daily, over a period of 72 hours. Outcome measurements comprised assessment of extracellular matrix (ECM)-related components, angiogenic factors, and inflammatory and fibrogenic markers on gene expression and protein levels.
Under inflammatory conditions, the inflammatory cytokine IL11, as well as the myofibroblast marker alpha smooth muscle actin (α-SMA) were significantly reduced when additional vibration was applied. The desirable anti-fibrotic ECM component hyaluronic acid was increased following cytokine treatment, but was not diminished following vibration.
Our experiments revealed the effect of vibrational stress on hVFF in an inflammatory state. Elevated levels of certain pro-inflammatory/pro-fibrotic factors could be mitigated by additional vibrational excitation in an in vitro setting. These findings corroborate clinical studies which recommend early voice activation following an acute event.
Journal Article
Self-reinforced piezoelectric chip for scaffold-free repair of critical-sized bone defects
The use of piezoelectric materials to treat critical-sized bone defects typically requires additional stimulation to generate their piezoelectric properties and the implantation of scaffolds to promote bone repair. Here we present a self-reinforced piezoelectric chip and demonstrate its efficacy in the treatment of critical-sized bone defects. Specifically, the chip is comprised of the third-generation semiconductor aluminum nitride (AlN) as a piezoelectric layer, molybdenum (Mo) electrodes, and a silicon substrate with an optimized internal cavity structure. All these components are confirmed to be non-cytotoxic. This design enables the chip to provide self-sustained and long-term electrical signals in response to physiological vibrations. After being implanted into a rabbit critical-sized femoral defect model, the chip creates a localized bioelectric microenvironment, thereby promoting vascularized bone repair within 4 weeks without using any scaffolds and additional tools. Moreover, the chip can be fixed onto the clinically used orthopedic plate system, representing a universal plug-and-play strategy.
Piezoelectric materials for bone repair usually require scaffold filling and external stimulation. Here, the authors present a self-reinforced chip that can spontaneously generate piezoelectric effect under physiological vibrations to achieve scaffold-free repair of critical-sized bone defects
Journal Article
Whole-body vibration training versus conventional balance training in patients with severe COPD—a randomized, controlled trial
Background
Whole-body vibration training (WBV) performed on a vibration platform can significantly improve physical performance in patients with chronic obstructive pulmonary disease. It has been suggested that an important mechanism of this improvement is based on an improvement in balance. Therefore, the aim of this study was to investigate the effects of WBV compared to conventional balance training.
Methods
48 patients with severe COPD (FEV
1
: 37 ± 7%predicted) and low exercise performance (6 min walk distance (6MWD): 55 ± 10%predicted) were included in this randomized controlled trial during a 3 week inpatient pulmonary rehabilitation. All patients completed a standardized endurance and strength training program. Additionally, patients performed 4 different balance exercises 3x/week for 2 sets of 1 min each, either on a vibration platform (Galileo) at varying frequencies (5–26 Hz) (WBV) or on a conventional balance board (BAL). The primary outcome parameter was the change in balance performance during a semi tandem stance with closed eyes assessed on a force measurement platform. Muscular power during a countermovement jump, the 6MWD, and 4 m gait speed test (4MGST) were secondary outcomes. Non-parametric tests were used for statistical analyses.
Results
Static balance performance improved significantly more (
p
= 0.032) in favor of WBV (path length during semi-tandem stand: − 168 ± 231 mm vs. + 1 ± 234 mm). Muscular power also increased significantly more (
p
= 0.001) in the WBV group (+ 2.3 ± 2.5 W/kg vs. − 0.1 ± 2.0 W/kg). 6MWD improved to a similar extent in both groups (WBV: 48 ± 46 m,
p
< 0.001 vs. BAL: 38 ± 32 m;
p
< 0.001) whereas the 4MGST increased significantly only in the WBV-group (0.08 ± 0.14 m/s
2
,
p
= 0.018 vs. 0.01 ± 0.11 m/s
2
,
p
= 0.71).
Conclusions
WBV can improve balance performance and muscular power significantly more compared to conventional balance training.
Trial registration:
Clinical-Trials registration number: NCT03157986; date of registration: May 17, 2017.
https://clinicaltrials.gov/ct2/results?cond=&term=NCT03157986&cntry=&state=&city=&dist
=
Journal Article
Vibrational exercise for Crohn’s to observe response (VECTOR): Protocol for a randomized controlled trial
Crohn’s disease (CD) is a long-term inflammatory gastrointestinal disorder, often adversely affecting physical, emotional, and psychological well-being. Pharmaceutical management is habitually adopted; although medicinal therapies require continuous administration, and are often associated with significant side effects and low adherence rates. Whole body vibration (WBV) represents a non-invasive technique, that provides vibration stimulation to the entire body. As WBV appears to target the physiological pathways and symptoms pertinent to CD epidemiology, it may have significant potential as a novel non-pharmaceutical intervention therapy in CD. This paper presents the study protocol for a randomised controlled trial investigating the impact of WBV on health outcomes in individuals with CD. This 6-week, parallel randomised controlled trial will recruit 168 individuals, assigned to receive WBV and lifestyle education 3 times per week compared to control, receiving lifestyle education only. The primary outcome of the trial will be the difference from baseline to post-intervention in health-related quality of life between the groups, assessed with the Inflammatory Bowel Disease Quality of Life Questionnaire. Secondary outcomes will include between-group differences in other questionnaires assessing fatigue, anxiety and pain, measures of physical fitness, and biological markers for disease activity and inflammation. Statistical analyses will follow an intention-to-treat approach, using linear mixed-effects models to compare changes between time points and both trial groups. Ethical approval was granted by the Nottingham Research Ethics Committee (REC: 24/EM/0106) and the study has been registered prospectively as a clinical trial (NTC06211400).
Journal Article