WHOLE-BODY VIBRATION EXERCISE IS WELL TOLERATED IN PATIENTS WITH DUCHENNE MUSCULAR DYSTROPHY: A SYSTEMATIC REVIEW

Trunk-oriented Exercises Versus Whole-body Vibration on Abdominal Thickness and Balance in Children with Duchene Muscular Dystrophy

OBJECTIVES

Progressive proximal muscle weakening in children with Duchenne muscular dystrophy (DMD) impairs postural adjustments by impairing motor function and preventing ambulation. During daily activities, for gait and dynamic balance, certain postural modifications are required. The objective was to compare the impact of trunk-oriented exercises versus whole-body vibration on abdominal muscle thickness and balance in children with DMD.

METHODS

Participants in this study were 30 boys with DMD, aged 6 to 10 years old. Children were divided into two groups (A and B) randomly. Children in group (A) underwent a prescribed regimen of physical therapy along with trunk-oriented exercises, whereas group (B) received the same regimen as group (A) together with whole-body vibration three times per week for three consecutive months. Balance and the thickness of the abdominal muscles were measured using the Biodex balance system and ultrasonography, respectively, before and after therapy.

RESULTS

When compared to the pre-treatment results in both groups, the post-treatment results showed a significant difference in all measured variables (p<0.05). Post-treatment values showed that all of the measured variables significantly differed in favor of group A.

CONCLUSIONS

Trunk-oriented exercises can improve abdominal thickness and balance more effectively than whole-body vibration in children with DMD.

CLINICALTRIALS

gov ID: NCT05688072.

The new challenge of “exercise + X″ therapy for Duchenne muscular dystrophy—Individualized identification of exercise tolerance and precise implementation of exercise intervention

Duchenne muscular dystrophy (DMD) is an X-linked recessive fatal muscular disease. Gene therapy, cell therapy, and drug therapy are currently the most widely used treatments for DMD. However, many experiments on animals and humans suggested that appropriate exercise could improve the effectiveness of such precision medicine treatment, thereby improving patient’s muscle quality and function. Due to the striated muscle damage of DMD individuals, there are still many debates about whether DMD animals or patients can exercise, how to exercise, when to exercise best, and how to exercise effectively. The purpose of this review is to summarize and investigate the scientific basis and efficacy of exercise as an adjuvant therapy for DMD gene therapy, cell therapy and drug therapy, as well as to present the theoretical framework and optional strategies of “exercise + X″″ combination therapy.

The effect of aerobic training on motor function and muscle architecture in children with Duchenne muscular dystrophy: A randomized controlled study

OBJECTIVE

To explore the effects of aerobic training adding to home-based exercise program on motor function and muscle architectural properties in children with Duchenne muscular dystrophy.

DESIGN

This is a prospective randomized controlled study.

SETTING

Pediatric neuromuscular clinic in a tertiary care center.

SUBJECTS

Children with Duchenne muscular dystrophy.

INTERVENTIONS

Children were randomly divided into two groups whereby 12-weeks aerobic training was additionally given in treatment group in contrast to the control group which received only home-based exercise program.

MAIN MEASURES

Motor Function Measure and Six Minute Walk Test were used for clinical evaluation, and muscle architectural properties (thickness, pennation angle and fascicle length) were measured by ultrasound imaging. Both groups were assessed at baseline and after 12-weeks of training.

RESULTS

Median age of children was 7.9 years in the treatment group and 8.6 years in the control group (p > 0.05). Significant improvements were obtained for Motor Function Measure and Six Minute Walk Test from baseline to 12-weeks in the treatment group; Motor Function Measure total score changed from 83.2 (6.1) to 86.9 (4.0) vs. 82.3 (10.2) to 80.4 (9.4) points in the control group (p  =  0.006); 6 Minute Walk Test distance changed from 395.3 (46.6) to 413.0 (52.3) vs. 421.7 (64.4) to 393.8 (68.2) meters in the control group (p < 0.001). However, muscle architectural parameters did not change during study period (p > 0.05).

CONCLUSION

Aerobic training may be of additional value in improving motor function and performance with no remarkable effect on muscle architectural properties.

Integrative ATAC-seq and RNA-seq Analysis of the Longissimus Muscle of Luchuan and Duroc Pigs

Luchuan pig is a typical obese pig breed in China, and the diameter and area of its longissimus dorsi muscle fibers are significantly smaller than those of Duroc (lean) pig. Skeletal muscle fiber characteristics are related to meat quality of livestock. There is a significant correlation between the quality of different breeds of pork and the characteristics of muscle fiber, which is an important factor affecting the quality of pork. The diameter and area of muscle fibers are related to muscle growth and development. Therefore, we used the assay for transposase-accessible chromatin using sequencing (ATAC-seq) and RNA sequencing (RNA-seq) analysis to investigate the potential mechanism underlying the difference in skeletal muscle growth and development between the two types of pigs. First, transposase-accessible chromatin was analyzed to map the landscape of open chromatin regions and transcription factor binding sites. We identified several transcription factors that potentially affected muscle growth and development, including TFAP4, MAX, NHLH1, FRX5, and TGIF1. We also found that transcription factors with basic helix-loop-helix structures had a preference for binding to genes involved in muscle development. Then, by integrating ATAC-seq and RNA-seq, we found that the Wnt signaling pathway, the mTOR signaling pathway, and other classical pathways regulate skeletal muscle development. In addition, some pathways that might regulate skeletal muscle growth, such as parathyroid hormone synthesis, secretion, and action, synthesis and degradation of ketone bodies, and the thyroid hormone signaling pathway, which were significantly enriched. After further study, we identified a number of candidate genes (ASNS, CARNS1, G0S2, PPP1R14C, and SH3BP5) that might be associated with muscle development. We also found that the differential regulation of chromatin openness at the level of some genes was contrary to the differential regulation at the level of transcription, suggesting that transcription factors and transcriptional repressors may be involved in the regulation of gene expression. Our study provided an in-depth understanding of the mechanism behind the differences in muscle fibers from two species of pig and provided an important foundation for further research on improving the quality of pork.

The Effect of Adiposity on Cardiovascular Function and Myocardial Fibrosis in Patients With Duchenne Muscular Dystrophy

Background

Patients with Duchenne muscular dystrophy (DMD) develop cardiomyopathy because of a dystrophin deficiency causing fibrofatty replacement of the myocardium. Corticosteroid use and mobility limitations place these patients at risk for increased adiposity. We sought to determine the association of adiposity with cardiovascular dysfunction in patients with DMD.

Methods and Results

This was a retrospective review of patients with DMD who underwent both cardiac magnetic resonance imaging and dual‐energy x‐ray absorptiometry within 1 year. The cardiac magnetic resonance imaging parameters included left ventricular ejection fraction and the presence of late gadolinium enhancement (LGE positive [LGE+]). The adiposity indices, measured by dual‐energy x‐ray absorptiometry, included percentage of body fat, whole body fat mass indexed to height, and body mass index. A total of 324 patients were identified. Fifty‐two percent had LGE+, and 36% had cardiac dysfunction (left ventricular ejection fraction <55%). Patients with cardiac dysfunction had higher whole body fat mass indexed to height and body mass index on univariate analysis (mean difference between patients with and without cardiac dysfunction: +2.9 kg/m, P=0.001; and +1.5 kg/m², P=0.03, respectively). whole body fat mass indexed to height remained independently associated with cardiac dysfunction on multivariable analysis after adjusting for age, LGE+, and corticosteroid duration. High whole body fat mass indexed to height and percentage of body fat were associated with LGE+ on univariate analysis (mean difference between patients with and without LGE+: +2.0 kg/m, P=0.02; and +2.4%, P=0.02, respectively). Using multivariable analysis, including age and cardiac dysfunction, high percentage of body fat remained independently associated with LGE+.

Conclusions

This study demonstrates an independent association of adiposity with cardiac dysfunction and LGE+ in patients with DMD. Preventing adiposity may mitigate the later development of ventricular dysfunction in DMD.

Possible Mechanisms for the Effects of Sound Vibration on Human Health

This paper presents a narrative review of research literature to “map the landscape” of the mechanisms of the effect of sound vibration on humans including the physiological, neurological, and biochemical. It begins by narrowing music to sound and sound to vibration. The focus is on low frequency sound (up to 250 Hz) including infrasound (1–16 Hz). Types of application are described and include whole body vibration, vibroacoustics, and focal applications of vibration. Literature on mechanisms of response to vibration is categorized into hemodynamic, neurological, and musculoskeletal. Basic mechanisms of hemodynamic effects including stimulation of endothelial cells and vibropercussion; of neurological effects including protein kinases activation, nerve stimulation with a specific look at vibratory analgesia, and oscillatory coherence; of musculoskeletal effects including muscle stretch reflex, bone cell progenitor fate, vibration effects on bone ossification and resorption, and anabolic effects on spine and intervertebral discs. In every category research on clinical applications are described. The conclusion points to the complexity of the field of vibrational medicine and calls for specific comparative research on type of vibration delivery, amount of body or surface being stimulated, effect of specific frequencies and intensities to specific mechanisms, and to greater interdisciplinary cooperation and focus.

Current and emerging therapies for Duchenne muscular dystrophy and spinal muscular atrophy

Many neuromuscular diseases are genetically inherited or caused by mutations in motor function proteins. Two of the most prevalent neuromuscular diseases are Duchenne Muscular Dystrophy (DMD) and Spinal Muscular Atrophy (SMA), which are often diagnosed during the early years of life, contributing to life-long debilitation and shorter longevity. DMD is caused by mutations in the dystrophin gene resulting in critical muscle wasting, with cardiac or respiratory failure by age 30. Lack of dystrophin protein is the leading cause of degeneration of skeletal and cardiac muscle. Corticosteroids and artificial respirators remain as the gold-standard management of complications and have significantly extended the life span of these patients. Additionally, drug therapies including eteplirsen (EXONDYS 51®), golodirsen (VYONDYS 53™), and viltolarsen (VILTEPSO®) have been approved by the FDA to treat specific types of DMD. SMA is defined by the degeneration of the anterior horn cells in the spinal cord and destruction of motor neuron nuclei in the lower brain-stem caused by SMN1 gene deletion. Loss of SMN1 protein is partly compensated by SMN2 protein synthesis with disease severity being affected by the success of SMN2 gene synthesis. Evidence-based recommendations for SMA are directed towards supportive therapy and providing adequate nutrition and respiratory assistance as needed. Treatment and prevention of complications of muscle weakness are crucial for reducing the phenotype expression of SMA. Furthermore, drug therapies including injectables such as onasemnogene abeparvovec-xioi (ZOLGENSMA®), nusinersen (SPINRAZA®), and an oral-solution, risdiplam (EVRYSDI™), are medications that have been FDA-approved for the treatment of SMA. This review discusses the current and emerging therapeutic options for patients with DMD and SMA.

Effect of Whole-Body Vibration on the Functional Responses of the Patients with Knee Osteoarthritis by the Electromyographic Profile of the Vastus Lateralis Muscles during the Five-Repetition Chair Stand Test: A Randomized Crossover Trial

Knee osteoarthritis (KOA) can cause functional disability. Neuromuscular function is relevant in the development and progression of KOA. It can be evaluated by the analysis of the surface electromyography (sEMG), which has an important role in the understanding of KOA. Whole-body vibration (WBV) is an intervention suggested to treat KOA. The objective of this work was to verify the effectiveness of WBV on the functionality of lower limbs by the electromyographic profile of the vastus lateralis (VL) muscles during the five-repetition chair stand test (5CST) in patients with KOA. This was a two-period crossover trial study (8-week washout). Nineteen patients with KOA were allocated to the group submitted to WBV (WBVG), with peak-to-peak displacement of 2.5 to 7.5 mm, frequency from 5 to 14 Hz, and acceleration peak from 0.12 to 2.95 g, or to the control group (0 Hz) (2 days per week for 5 weeks). The 5CST and the sEMG of the VL during 5CST were evaluated before and after the interventions. Results: Significant differences in 5CST were evident only in WBVG (p = 0.018), showing a decrease of the execution time. The sEMG profile showed no significative difference. Therefore, only 10 sessions of WBV with comfortable posture can bring about improvement in functionality of KOA patients without alteration of the muscle excitation.

Effect of Aerobic Physical Exercise in an Animal Model of Duchenne Muscular Dystrophy

Duchenne muscular dystrophy (DMD) is a condition caused by an amendment to the X chromosome, inherited as a recessive trait, and affects 1:3500 live births, especially males. Low-intensity exercise is known to decrease certain parameters associated with muscular degeneration in animal models of progressive muscular dystrophies. In the present study, 28-day-old male mdx and wild-type (wild) mice were used. The animals were subjected to a low-intensity physical exercise protocol for 8 weeks. It was found that this protocol was able to reduce oxidative stress in muscle tissue and in most of the CNS structures analyzed, with a significant increase in antioxidant activity in all analyzed structures. It is thus possible to infer that this exercise protocol was able to reduce oxidative stress and improve the energy metabolism in brain tissue and in the gastrocnemius muscle of animals with DMD.

Exercise in muscle disorders: what is our current state?

PURPOSE OF REVIEW

Regular exercise improves muscle and cardiovascular function, which is why exercise is used as an adjuvant treatment in myopathies. In this review, we provide an update on recent exercise studies (from 2016) performed in humans with inherited myopathy.

RECENT FINDINGS

Several studies provide new and interesting insight in the field of exercise in myopathies. A retrospective cohort study suggests that exercise may actually increase rate of disease progression in dysferlinopathy, and high intensity exercise, which is normally discouraged in muscle disorders because of the risk of muscle damage, is demonstrated to be an efficient time saving mode of exercise to train patients with facioscapulohumeral muscular dystrophy. Exoskeletons and antigravity trainers are examples of new devices, which provide an opportunity for very weak patients to train. Finally, several studies, including two randomized controlled trials, support the beneficial role of exercise as treatment of myopathy.

SUMMARY

The reviewed studies extend previous knowledge about exercise, indicating that exercise is generally safe and well tolerated, and improves functional outcomes in patients with inherited muscle disease. However, recent studies also highlight the fact that the effect of exercise differs with mode of exercise and exercise prescriptions should be disease specific.

Clinical Approaches of Whole-Body Vibration Exercises in Individuals with Stroke: A Narrative Revision

Stroke is associated with long-term disability and patients experience numerous physical impairments including muscle weakness, particularly in the paretic limbs, balance, and functional mobility. During acute stroke rehabilitation, when individuals are less likely to be functionally independent and rely on rehabilitative care, the efficacy of low skill interventions that can reduce sedentary behaviour should be established. As such, this narrative revision focused on the use of empirical studies of whole-body vibration exercise (WBVE) on different health outcomes in stroke patients. The effects of WBVE on neuromuscular performance (muscular strength and power), mobility, spasticity, and cardiovascular responses have been highlighted. Although some positive results were reported we can conclude that there is no solid evidence confirming the beneficial effects of WBVE among people with stroke compared with either other types of physical activities or sham WBVE. Therefore, further research should be performed in this area, testing the feasibility and efficacy of using WBVE in a more homogeneous sample of stroke patients or comparing different WBVE parameters.

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.

Assessment Through the Short Physical Performance Battery of the Functionality in Individuals With Metabolic Syndrome Exposed to Whole-Body Vibration Exercises

Physical activity is recommended in the management of individuals with metabolic syndrome (MetS), and recent studies have suggested whole-body vibration exercise (WBVe) for this population. The aim of this study was to evaluate the functionality through the Short Physical Performance Battery (SPPB) in individuals with MetS after WBVe. The SPPB evaluates the balance, the gait speed, and the lower limb strength (five-chair stand [5CS] test). Forty-four individuals with MetS were divided into WBVe (WBVeG) and control (CG) groups. The individuals of the WBVeG performed 10 sessions of WBVe in an oscillating/vibratory platform (OVP), barefoot, for 3 minutes at the peak-to-peak displacements of 2.5, 5.0, and 7.5 mm, with a resting period of 1 minute (total time: 18 minutes/session). The frequencies ranged from 5 up to 14 Hz. The individuals of the CG performed all the steps of the study, but the OVP was turned off. Before the first and after the tenth session, the individuals performed the SPPB. Significant responses were found in the WBVeG, analyzing the total score of the SPPB (P = .005), the balance test (P = .01), the gait speed (P = .006), and the 5CS test (P = .03), resulting in the improvement of the functionality of individuals with MetS.

Can whole body vibration exercises affect growth hormone concentration? A systematic review

Whole body vibration (WBV) has been recognized as an effective alternative exercise modality to resistance exercise for its ability in enhancing force and power, generating capacity in skeletal muscle, increasing bone mass and improving cardiovascular function. Since the effect of WBV exercises on growth hormone (GH) levels has been never compared and discussed, the aim of this study was to review systematically the literature to verify the WBV effects on GH concentration. By using PubMed, Scopus and PEDRo databases with the keywords 'growth hormone' or GH and 'whole body vibration' or WBV, we found and analysed 12 papers (182 subjects recruited), verifying their level of evidence (National Health and Medical Research Council hierarchy of evidence) and the methodological quality (PEDRo scale). Although WBV induced GH responses in nine out of 12 publications, caution should be however taken when considering the results due to the markedly different methodologies among these publications.