A low proportion of systematic reviews in physical therapy are registered: a survey of 150 published systematic reviews

There is more to the knee joint than just the quadriceps: A systematic review with meta-analysis and evidence gap map of hamstring strength, flexibility, and morphology in individuals with gradual-onset knee disorders

BACKGROUND

Impairments in hamstring strength, flexibility, and morphology have been associated with altered knee biomechanics, pain, and function. Determining the presence of these impairments in individuals with gradual-onset knee disorders is important and may indicate targets for assessment and rehabilitation. This systematic review aimed to synthesize the literature to determine the presence of impairments in hamstring strength, flexibility, and morphology in individuals with gradual-onset knee disorders.

METHODS

Five databases (MEDLINE, Embase, CINAHL, SPORTDiscus, and Web of Science) were searched from inception to September 2022. Only studies comparing hamstring outcomes (e.g., strength, flexibility, and/or morphology) between individuals with gradual-onset knee disorders and their unaffected limbs or pain-free controls were included. Meta-analyses for each knee disorder were performed. Outcome-level certainty was assessed using the Grading of Recommendations Assessment, Development, and Evaluation, and evidence gap maps were created.

RESULTS

Seventy-nine studies across 4 different gradual-onset knee disorders (i.e., knee osteoarthritis (OA), patellofemoral pain (PFP), chondromalacia patellae, and patellar tendinopathy) were included. Individuals with knee OA presented with reduced hamstring strength compared to pain-free controls during isometric (standard mean difference (SMD) = -0.76, 95% confidence interval (95%CI) : -1.32 to -0.21) and concentric contractions (SMD = -0.97, 95%CI : -1.49 to -0.45). Individuals with PFP presented with reduced hamstring strength compared to pain-free controls during isometric (SMD = -0.48, 95%CI : -0.82 to -0.14), concentric (SMD = -1.07, 95%CI : -2.08 to -0.06), and eccentric contractions (SMD = -0.59, 95%CI : -0.97 to -0.21). No differences were observed in individuals with patellar tendinopathy. Individuals with PFP presented with reduced hamstring flexibility when compared to pain-free controls (SMD = -0.76, 95%CI : -1.15 to -0.36). Evidence gap maps identified insufficient evidence for chondromalacia patellae and hamstring morphology across all gradual-onset knee disorders.

CONCLUSION

Our findings suggest that assessing and targeting impairments in hamstring strength and flexibility during rehabilitation may be recommended for individuals with knee OA or PFP.

Local anesthetics as a tool for Staphylococcus spp. control: a systematic review

The objective of this work was to carry out a systematic review on the effectiveness of local anesthetics as antimicrobial agents against Staphylococcus spp. Searches were performed in the PubMed, Web of science, Scopus, Embase and Lilacs databases. As inclusion criteria, complete original articles, with in vitro experimental tests with the application of selected anesthetics and bacteria of the genus Staphylococcus spp. This review followed the methodological checklist for writing papers reporting systematic reviews by the PRISMA statement. The risk of bias was assessed according to the JBI critical appraisal checklist. Analysis was performed using an anesthetic-moderated simple linear regression model. This systematic review was registered by the Open Science Framework-OSF ( https://doi.org/10.17605/OSF.IO/C5JM7 ). Initially, 1141 articles were found, of which, after careful selection, 52 articles were analyzed. Lidocaine was the most commonly used anesthetic, being evaluated in 35 of the articles. S. aureus ATCC 25923 was the standard microorganism in 17 articles. The impact of the anesthetic concentration in relation to the antimicrobial effect was evaluated and the results showed that there was no statistically significant difference. (F [5, 12] = 0.688 p = 0.642), even when taking into account the moderator effect of anesthetics individually. Therefore, although the antimicrobial effect of local anesthetics was demonstrated in 82.7% of the studies evaluated, great heterogeneity of the results was found, which made it impossible to carry out a meta-analysis and make recommendations based on the evidence.

Determining the Completeness of Registration and Reporting in Systematic Reviews of Yoga for Health

Introduction: Yoga is a mind-body practice often used to improve health. Systematic reviews (SRs) of randomized controlled trials on yoga for health are foundational to evidence-based yoga interventions and require rigorous and transparent methods, including preparation of a protocol (e.g., PROSPERO) and following SR reporting guidelines (e.g., Preferred Reporting Items for Systematic Reviews and Meta-Analyses [PRISMA]). Objective: To evaluate the availability of protocols and the completeness of reporting for SRs on yoga for health. Methods: We used a previously assembled database of SRs focused on the use of yoga for health. The authors independently extracted data on protocol availability, PROSPERO registration, and reporting for each PRISMA 2009 checklist item. Discrepancies were discussed or referred to a third author. We used Stata 10 software to produce descriptive statistics and tests for relationships between registration, reporting, and publication year, country, and journal type. Results: We included 147 reviews published between 2005 and 2019. The most common first author country was the United States or Germany (total 67/147; 46%), and the most common journal type was specialty journals (71/147; 48%). Most reviews (116/147; 79%) made no mention of a protocol or registration, and only 15/147 (10%) reviews were linked to an accessible protocol or registration. Most SRs published in 2010 or later mentioned or cited PRISMA (97/139; 70%), and individual PRISMA items were addressed between 10% and 100% of the time. PRISMA reporting improved; over time, but there was no relationship with country or journal type. Discussion: This study identifies a need for increased SR registration for yoga research. The assessment of PRISMA reporting did not evaluate the comprehensiveness with which each item was reported, and while trends are encouraging, there is likely room for improvement. We recommend registering all yoga SRs and following updated PRISMA and recent yoga-specific guidelines for reporting. This may increase transparency, minimize bias, and produce high-quality data to inform evidence-based yoga practices.

Trials and tribulations of transparency related to inconsistencies between plan and conduct in peer-reviewed physiotherapy publications: A methodology review

RATIONALE

The physiotherapy profession strives to be a leader in providing quality care and strongly recognizes the value of research to guide clinical practice. Adherence to guidelines for research reporting and conduct is a significant step towards high-quality, transparent and reproducible research.

AIM/OBJECTIVE

Assess integrity between planned and conducted methodology in randomized controlled trials (RCTs) and systematic reviews (SRs) published in physiotherapy journals.

METHODS

Eighteen journals were manually searched for RCTs and SRs published from 1 July 2021 through 31 December 2021. Studies were included if the journal or specific study was indexed in PubMed and published/translated in English. Descriptive statistics determined congruence between preregistration data and publication.

RESULTS

Forty RCTs and 68 SRs were assessed. Forty-three SRs included meta-analysis (MA). Of the 34 registered RCTs, 7 (20.6%) had no discrepancy between the registration and publication. Two trials (5.9%) addressed all discrepancies, 4 (11.8%) addressed some and 21 (61.8%) did not address any discrepancies. Of the 36 registered MAs, 33 (91.7%) had discrepancies between the registration and publication. Two (5.6%) addressed all discrepancies and three (8.3%) had no discrepancies. Eight SRs without MA published information not matching their registration, and none provided justification for the discrepancies.

CONCLUSION

Most RCTs/SRs were registered; the majority had discrepancies between preregistration and publication, potentially influencing the outcomes and interpretations of findings. Journals should require preregistration and compare the submission with the registration information when assessing publication suitability. Readers should be aware of these inconsistencies and their implications when interpreting and translating results into practice.

Is the quality of systematic reviews influenced by prospective registration: a methods review of systematic musculoskeletal physical therapy reviews

INTRODUCTION

It is unknown if verified prospective registration of systematic reviews (SRs) and the randomized clinical trials (RCTs) that they use affect an SR's methodological quality on A MeaSurement Tool to Assess Systematic Reviews 2 (AMSTAR 2).

METHODS

Data originated from interventional SRs published in International Society of Physiotherapy Journals Editors (ISPJE) member journals, indexed in MEDLINE, between 1 January 2018 and 18 August 2021. Blinded reviewers identified the SRs and extracted the data for the variables of interest for the SRs and the RCTs.

RESULTS

Two of 14 ISPJE member journals required prospective SR registration. Twenty SRs were identified, and 169 unique, retrievable RCTs were included within those SRs. One (5.0%) of the 20 SRs and 15 of the 169 (8.9%) RCTs were prospectively registered and published consistent with this intent. Nineteen (95.0%) of the 20 identified SRs was categorized as 'critically low' on the AMSTAR 2.

DISCUSSION

SRs and the RCTs identified within them were infrequently prospectively registered, prospectively verifiable, or prospectively verified based on the established research record.

CONCLUSIONS

Ensuring that SRs and RCTs have fidelity with the research record from conception to publication may help rule out low-value interventions, decrease variability in physical therapy practice, and solidify evidence-based physical therapy practice.

What Parameters Influence the Effect of Cold-Water Immersion on Muscle Soreness? An Updated Systematic Review and Meta-Analysis

OBJECTIVE

Our objective was to determine the efficacy of cold-water immersion (CWI) on the management of muscle soreness to identify the impact of immersion time, water temperature, CWI protocol, and type of exercise on this outcome.

DESIGN

Intervention systematic review and meta-analysis.

SETTING

MEDLINE/PubMed, Embase, Central, and SPORTDiscus databases were searched from their earliest record to July 30, 2020. Only randomized controlled trials that assessed muscle soreness comparing CWI and control were included. Studies were pooled in different subgroups regarding the used protocol: water temperature (severe or moderate cold), immersion time (short, medium, or longer time), CWI protocol (intermittent or continuous application), and type of exercise (endurance or resistance exercise). Data were pooled in a meta-analysis and described as weighted mean difference (95% confidence interval, P < 0.05).

PARTICIPANTS

Athletes and nonathletes.

INTERVENTIONS

Cold-water immersion and control condition.

MAIN OUTCOME MEASURES

Muscle soreness.

RESULTS

Forty-four studies were included. For immediate effects, CWI was superior to control regardless of water temperature and protocol, and for short and medium immersion times and endurance exercises. For delayed effects, CWI was superior to control in all subgroups except longer immersions time.

CONCLUSIONS

This study suggests that CWI is better than control for the management of muscle soreness and water temperature and CWI protocol do not influence this result, but only short and medium immersions times presented positive effects. Aiming immediate effects, the best results suggest CWI application only after endurance exercises, while delayed effect CWI was superior both after endurance and resistance exercises.

A Reporting Quality Assessment of Systematic Reviews and Meta-Analyses in Sports Physical Therapy: A Review of Reviews

This review of reviews aimed to evaluate the reporting quality of published systematic reviews and meta-analyses in the field of sports physical therapy using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. This review of reviews included a literature search; in total, 2047 studies published between January 2015 and December 2020 in the top three journals related to sports physical therapy were screened. Among the 125 identified articles, 47 studies on sports physical therapy were included in the analysis (2 systematic reviews and 45 meta-analyses). There were several problems areas, including a lack of reporting for key components of the structured summary (10/47, 21.3%), protocol and registration (18/47, 38.3%), risk of bias in individual studies (28/47, 59.6%), risk of bias across studies (24/47, 51.1%), effect size and variance calculations (5/47, 10.6%), additional analyses (25/47, 53.2%), and funding (10/47, 21.3%). The quality of the reporting of systematic reviews and meta-analyses of studies on sports physical therapy was low to moderate. For better evidence-based practice in sports physical therapy, both authors and readers should examine assumptions in more detail, and report valid and adequate results. The PRISMA guideline should be used more extensively to improve reporting practices in sports physical therapy.

Do patients with acute low back pain in emergency departments have more severe symptoms than those in general practice? A systematic review with meta-analysis

INTRODUCTION

There is a common belief that patients presenting to emergency departments have more severe pain levels and functional limitations than those in general practice. The aim of this systematic review was to compare pain and disability levels of patients with acute low back pain presenting to general practice versus those presenting to emergency departments.

METHODS

Electronic searches were conducted in MEDLINE, EMBASE and CINAHL from inception to February 2019. Observational studies including patients with acute non-specific low back pain presenting to emergency departments and/or general practice were eligible. Pain and/or disability scores expressed on a 0-100 scale were the primary outcomes. Risk of bias was evaluated using a validated tool for observational studies and the overall quality of evidence was assessed using GRADE. Meta-analysis using random effects and meta-regression were used to test for differences between the two settings.

RESULTS

We included 12 records reporting results for 10 unique studies with a total of 6,999 participants from general practice (n = 6) and emergency departments (n = 4). There was low quality evidence (downgraded for indirectness and inconsistency) that patients presenting to emergency departments had higher pain scores than those in general practice with a mean difference of 17.3 points (95%CI: 8.8 to 25.9 on a 0-100 scale). Similarly, there was low quality evidence (downgraded for indirectness and inconsistency) that patients presenting to emergency departments had higher disability scores than those in general practice (mean difference: 21.7, 95%CI: 4.6 to 38.7 on a 0-100 scale).

CONCLUSION

Patients with acute non-specific low back pain presenting to emergency departments may report higher levels of pain and disability than those seen in general practice.

PROSPERO REGISTRATION NUMBER

CRD42017076806.

Do exercise-based prevention programmes reduce non-contact musculoskeletal injuries in football (soccer)? A systematic review and meta-analysis with 13 355 athletes and more than 1 million exposure hours

OBJECTIVE

The aim of this systematic review was to investigate the effect of exercise-based programmes in the prevention of non-contact musculoskeletal injuries among football players in comparison to a control group.

DESIGN

Systematic review and meta-analysis of randomised controlled trials.

DATA SOURCES

MEDLINE, EMBASE, CENTRAL, CINAHL, PEDro and SPORTDiscus databases were searched from the earliest record to January 2021.

ELIGIBILITY CRITERIA

Studies were eligible if they (1) included football players aged 13 years or older, (2) used exercise-based programmes as intervention, (3) presented the number of non-contact musculoskeletal injuries (ie, defined as any acute sudden onset musculoskeletal injury that occurred without physical contact) and exposure hours for each group, and (4) had a control group (eg, usual training, minimal intervention, education). All types of exercise-based prevention programmes were eligible for inclusion. Risk of bias for each included study and overall quality of evidence for the meta-analysis were assessed.

RESULTS

Ten original randomised controlled trials with 13 355 football players and 1 062 711 hours of exposure were selected. Pooled injury risk ratio showed very low-quality evidence that exercise-based prevention programmes reduced the risk of non-contact musculoskeletal injuries by 23% (0.77 (95% CI 0.61 to 0.97)) compared with a control group.

CONCLUSION

Exercise-based prevention programmes may reduce the risk of non-contact musculoskeletal injuries by 23% among football players. Future high-quality trials are still needed to clarify the role of exercise-based programmes in preventing non-contact musculoskeletal injuries among football players.

PROSPERO REGISTRATION NUMBER

CRD42020173017.

Should low-quality evidence dominate high-level evidence? A systematic review and meta-analysis of systematic reviews of musculoskeletal physical therapy interventions

OBJECTIVES

To determine the: 1) quality of articles cited in systematic reviews (SRs); 2) methodological quality of the SRs; and 3) impact of quality on level 1A evidence.

METHODS

SRs related to musculoskeletal physical therapy interventions were identified. The methodological quality of the SRs and articles cited by the SRs were assessed by two blinded reviewers. Data analysis was performed by a third blinded researcher. Additional comparisons were made based on the Journal Impact Factor, spin, financial bias, and conflict of interest.

RESULTS

Twenty-four SRs were identified; 21/24 SRs had 'critically low' quality on the AMSTAR 2. Thirty-four percent of included studies were 'low quality,' and 58% of SRs included studies that had unreported external validity. One-half of the SRs represented 'spin,' and one-third of the SRs generated conclusions based on low-quality clinical trials.

DISCUSSION

The 'critically low' SRs methodological quality was exacerbated by low-quality research inclusion. Most SRs failed to follow best practices, including prospective registration and integration of professional librarians in the search process. Based on the high proportion of SRs that include low-quality trials and overall low methodological quality, further discussion regarding practice recommendations on level vs. quality of evidence is warranted.

LEVEL OF EVIDENCE

1a.

Emergency department interventions for adult patients with low back pain: a systematic review of randomised controlled trials

BACKGROUND

Most low back pain trials have limited applicability to the emergency department (ED) because they provide treatment and measure outcomes after discharge from the ED. We investigated the efficacy and safety of pharmacological and non-pharmacological interventions delivered in the ED to patients with non-specific low back pain and/or sciatica on patient-relevant outcomes measured during the emergency visit.

METHODS

Literature searches were performed in MEDLINE, EMBASE and CINAHL from inception to week 1 February 2020. We included all randomised controlled trials investigating adult patients (≥18 years) with non-specific low back pain and/or sciatica presenting to ED. The primary outcome of interest was pain intensity. Two reviewers independently screened the full texts, extracted the data and assessed risk of bias of each trial using the Physiotherapy Evidence Database (PEDro) scale. The overall quality of evidence, or certainty, provided by a set of trials evaluating the same treatment was evaluated using the Grading of Recommendations Assessment, Development and Evaluation (GRADE) approach, which considers imprecision, inconsistency, indirectness and bias in the evidence.

RESULTS

Fifteen trials (1802 participants) were included with 12 of 15 at low risk of bias (ie, PEDro score >6). Based on results from individual trials and moderate quality evidence, ketoprofen gel was more effective than placebo for non-specific low back pain at 30 min (mean difference (MD) -15.0, 95% confidence interval (CI) -21.0 to -9.0). For those with sciatica (moderate quality evidence), intravenous paracetamol (acetaminophen) (MD -15.7, 95% CI -19.8 to -11.6) and intravenous morphine (MD -11.4, 95% CI -21.6 to -1.2) were both superior to placebo at 30 min. Based on moderate quality of evidence, corticosteroids showed no benefits against placebo at emergency discharge for non-specific low back pain (MD 9.0, 95% CI -0.71 to 18.7) or sciatica (MD -6.8, 95% CI -24.2 to 10.6). There were conflicting results from trials comparing different pharmacological options (moderate quality evidence) or investigating non-pharmacological treatments (low quality evidence).

CONCLUSION

Ketoprofen gel for non-specific low back pain and intravenous paracetamol or morphine for sciatica were superior to placebo, whereas corticosteroids were ineffective for both conditions. There was conflicting evidence for comparisons of different pharmacological options and those involving non-pharmacological treatments. Additional trials measuring important patient-related outcomes to EDs are needed.

Patient Education for Patellofemoral Pain: A Systematic Review

OBJECTIVE

To evaluate the effect of education interventions compared with any type of comparator on managing patellofemoral pain (PFP).

DESIGN

Intervention systematic review. PROSPERO identifier: CRD42018088671.

LITERATURE SEARCH

MEDLINE, Embase, CINAHL, and Web of Science were searched for studies evaluating the effect of education on clinical and functional outcomes in people with PFP.

STUDY SELECTION CRITERIA

Two reviewers independently assessed studies for inclusion and quality. We included randomized controlled trials on PFP where at least 1 group received an education intervention (in isolation or in combination with other interventions).

DATA SYNTHESIS

Available data were synthesized via meta-analysis where possible; data that were not appropriate for pooling were synthesized qualitatively. Interpretation was guided by the Grading of Recommendations Assessment, Development and Evaluation approach.

RESULTS

Nine trials were identified. Low-credibility evidence indicated that health education material alone was inferior to exercise therapy for pain and function outcomes. Low- and very low-credibility evidence indicated that health professional-delivered education alone produced outcomes similar to those of exercise therapy combined with health professional-delivered education for pain and function, respectively.

CONCLUSION

Health professional-delivered education may produce similar outcomes in pain and function compared to exercise therapy plus health professional-delivered education in people with PFP. J Orthop Sports Phys Ther 2020;50(7):388-396. Epub 29 Apr 2020. doi:10.2519/jospt.2020.9400.

Co-occurrence of Chronic Musculoskeletal Pain and Cardiovascular Diseases: A Systematic Review with Meta-analysis

Objective

To determine the magnitude of the association between cardiovascular disease and chronic musculoskeletal pain.

Design

Systematic review with meta-analysis.

Methods

A comprehensive search was performed in five electronic databases. Population-based studies reporting the prevalence of cardiovascular diseases in adults stratified by chronic musculoskeletal pain status were considered eligible. Two independent reviewers performed the screening of the records following the inclusion criteria, extracted data, and evaluated the risk of bias of the included studies using an assessment tool of risk of bias for observational studies. In addition, we assessed the overall quality of evidence using an adaptation of the GRADE approach for prognosis.

Results

Twenty studies were included in this review. There was high-quality evidence that people with chronic musculoskeletal pain are 1.91 times more likely to report having a cardiovascular disease compared with those without chronic musculoskeletal pain (risk ratio = 1.91, 95% confidence interval = 1.64–2.21).

Conclusions

Our findings demonstrated associations between chronic musculoskeletal pain and any cardiovascular diseases. Future studies are still warranted to better understand the association between chronic musculoskeletal pain and the specific types of cardiovascular diseases.

Overall confidence in the results of systematic reviews on exercise therapy for chronic low back pain: a cross-sectional analysis using the Assessing the Methodological Quality of Systematic Reviews (AMSTAR) 2 tool

OBJECTIVE

To evaluate the overall confidence in the results of systematic reviews of exercise therapy for chronic non-specific low back pain using the AMSTAR 2 tool.

METHODS

PubMed, Embase, Cochrane Database of Systematic Reviews, PEDro and CINAHL was searched up to February 2017. Two independent reviewers selected systematic reviews of randomized controlled trials that investigated exercise therapy in patients with low back pain. AMSTAR 2 assessment was performed by pairs of reviewers, and the overall confidence in the results of the systematic reviews were rated as 'High', 'Moderate', 'Low' and 'Critically low'. Descriptive analysis was used to summarize the characteristics of included systematic reviews. The percentage of systematic reviews achieving each item from the AMSTAR 2 and the overall confidence in the results were tabulated.

RESULTS

The search identified 38 systematic reviews. Most of the reviews included a median of 10 clinical trials and total sample size of 813 participants per review. Five of 38 (13%) reviews were Cochrane reviews, and 8 (21%) systematic reviews had a protocol published or registered prospectively. The overall confidence in the results of 28 reviews (74%) was rated as 'Critically low', 6 (16%) as 'Low', 1 (2%) as Moderate, while 3 of 38 reviews (8%) were rated as 'High'.

CONCLUSION

The results demonstrate very low confidence in the results of most systematic reviews of exercise in chronic non-specific low back pain. Clinicians are more likely to deliver the most efficacious interventions to patients by critically appraising systematic reviews using AMSTAR 2 before making their decisions.

A descriptive analysis of the characteristics and the peer review process of systematic review protocols published in an open peer review journal from 2012 to 2017

BACKGROUND

An a priori design is essential to reduce the risk of bias in systematic reviews (SRs). To this end, authors can register their SR with PROSPERO, and/or publish a SR protocol in an academic journal. The latter has the advantage that the manuscript for the SR protocol is usually peer-reviewed. However, since authors ought not to begin/continue the SR before their protocol has been accepted for publication, it is crucial that SR protocols are processed in a timely manner. Our main aim was to descriptively analyse the peer review process of SR protocols published in 'BMC Systematic Reviews' from 2012 to 2017.

METHODS

We systematically searched MEDLINE via PubMed for all SR protocols published in 'BMC Systematic Reviews' between 2012 and 2017, except for protocols for overviews, scoping reviews or realist reviews. Data were extracted from the SR protocols and Open Peer Review reports. For each round of peer review, two researchers judged the extent of revision (minor/major) based on the reviewer reports. Their content was further investigated by two researchers in a random 10%-sample using PRISMA-P as a guideline. All data were analysed descriptively.

RESULTS

We identified 544 eligible protocols published in 'BMC Systematic Reviews' between 2012 and 2017. Of those, 485 (89.2%) also registered the SR in PROSPERO, the majority (87.4%) before first submission of the manuscript for the SR protocol (median 49 days). The absolute number of published SR protocols increased from 2012 to 2017 (21 vs 145 protocols), as did the median processing time (61 vs 142 days from submission to acceptance) and the proportion of protocols requiring a major revision after first peer review (19.1% vs 52.4%). Reviewer comments most frequently addressed the PRISMA-P item 'Eligibility criteria'. Overall, 76.0% of the reviewer comments suggested more transparency.

CONCLUSIONS

The number of published SR protocols increased over the years, but so did the processing time. In 2017, it took several months from submission to acceptance, which is critical from an author's perspective. New models of peer review such as post publication peer review for SR protocols should be investigated. This could probably be realized with PROSPERO.

Current evidence does not support whole body vibration in clinical practice in children and adolescents with disabilities: a systematic review of randomized controlled trial

BACKGROUND

Whole body vibration has been used alone or combined with other interventions in rehabilitation of children and adolescents with disabilities; however, there is limited evidence to support this approach.

OBJECTIVES

To review the strength, quality, and conclusiveness of evidence supporting the use of whole body vibration in children and adolescents with disabilities.

METHODS

Electronic database search included Medline, AMED, Embase, Cochrane, SportDiscus, CINAHL and PEDro from the inception to June 2018. Studies investigating the effects of whole body vibration, alone or combined with other interventions, compared to minimal intervention or other interventions were included. The outcomes measured were: body structure and function (lean body mass, bone mineral density, knee muscle strength and overall stability) and activity and participation (gait speed, walking distance, gross motor function, self-care and mobility).

RESULTS

Fifteen randomized trials involving 403 participants were included. Methodological quality of eligible trials was moderate (mean of 5.5 points on the 10-point PEDro scale). Overall, whole body vibration was no better than minimal intervention. In all comparisons where additional effect of whole body vibration was better than other interventions, the effect size ranged from low to high in the trials, but ranged from very-low to low quality at short and medium-term follow-up. Sensitivity analysis for health condition and low-quality studies showed impact on trunk bone mineral density of additional effect of whole body vibration at medium-term compared to other interventions.

CONCLUSION

The low to very-low quality of evidence suggests caution in recommending the use of this approach. New studies could change the findings of this review. PROSPERO registration: CRD42017060704.