Cliffton Chan

Cervical lateral glide increases nociceptive flexion reflex threshold but not pressure or thermal pain thresholds in chronic whiplash associated disorders: A pilot randomised controlled trial

Sensory hypersensitivity indicative of augmented central pain processing is a feature of chronic whiplash associated disorders (WAD). This study investigated the immediate effects of a cervical spine manual therapy (SMT) technique on measures of central hyperexcitability. In a randomised, single blind, clinical trial, 39 participants with chronic WAD were randomly assigned to a cervical SMT (lateral glide) or manual contact intervention. The Neck Disability Index (NDI) and GHQ-28 were administered at baseline. Pressure pain thresholds (PPTs), thermal pain thresholds (TPTs) and Nociceptive Flexion Reflex (NFR) responses (threshold and VAS of pain) were measured pre and post intervention. There was a significantly greater increase in NFR threshold following SMT compared to the manual contact intervention (p = 0.04). PPTs at the cervical spine increased following both SMT (mean +/- SE: 24.1 +/- 7.3%) and manual contact (21 +/- 8.4%) with no difference between interventions. There was no difference between interventions for pain ratings with the NFR test, PPTs at the Median Nerve or Tibialis Anterior, heat or cold TPT. SMT may be effective in reducing spinal hyperexcitability in chronic WAD.

Effect of a musicians' exercise intervention on performance-related musculoskeletal disorders

PURPOSE To evaluate the effect of a purpose-designed exercise program on performance-related musculoskeletal disorders (PRMDs) and associated risk factors in a sample of professional orchestral musicians. METHODS A 10-week exercise program was made available to full-time musicians employed by the eight premier symphony orchestras of Australia. Questionnaires were administered before, immediately after (T1), and 6 months after interventions (T2) containing questions relating to change in frequency and severity of PRMDs, ratings of perceived exertion (RPE) during rehearsal, private practice, and performance, as well as nine performance-related factors. Participants were also asked to rate whether these performance-related factors affected their overall playing capacity during different playing situations. A comparative control group of musicians had no intervention and completed a modified questionnaire at the same time points. RESULTS Exercise participants (n=30) reported a reduction in frequency (p<0.05) and severity (p<0.05) of PRMDs at T1 but not at T2 compared to controls (n=23). The exercise group reported a significant improvement in RPE during private practice at T1 (p<0.01) and T2 (p<0.01), but not during rehearsal and performance. At T1, the intervention was rated to be moderately to highly effective for three performance-related factors: strengthening muscles that support playing, learning techniques that support playing, and posture. Further, participants reported an intervention effect on overall playing capacity during rehearsal at T1 and T2. CONCLUSIONS A tailored exercise program for musicians was effective at managing PRMDs, especially in reducing the frequency and severity of PRMDs. Physical therapy exercises should be considered in modifying performance-related factors that have been reported to be predictors of PRMDs.

Exercise DVD effect on musculoskeletal disorders in professional orchestral musicians

BACKGROUND Professional musicians report a high prevalence of performance-related musculoskeletal disorders (PRMDs). Excessive muscle tension and fatigue have been reported as important factors contributing to PRMDs. AIMS To evaluate feasibility and effectiveness of a specific exercise programme delivered via a digital video disc (DVD) targeting PRMDs and associated risk factors. METHODS Volunteers from eight Australian symphony orchestras undertook two or more sessions per week over 12 weeks. Questionnaires were administered pre- and post-intervention with items including the frequency and severity of PRMDs, perceived exertion during different playing situations, per formance effects of the DVD and satisfaction rates. Musicians who had also participated in an equivalent face-to-face programme prior to this DVD trial compared the two interventions. RESULTS One hundred and forty-four out of 576 musicians volunteered (25% uptake), and 50 participants completed a mean 2.1 (SD 0.42) sessions over the 12 week period (41% compliance). PRMD frequency and severity were significantly reduced post-intervention (P < 0.01). Participants reported benefits of the DVD on strengthening muscles, increasing ease of movement and improving flexibility related to playing. Despite this, perceived exertion levels during private practice, rehearsal and performance remained the same (not significant). Seventy-eight per cent of participants scored their overall experience of the use of the DVD as good or excellent. Owing to its convenience and detailed exercise demonstrations, the DVD was rated as better or much better overall than the face-to-face classes by 55% of participants who had experienced both. CONCLUSIONS An exercise DVD was well received and appeared to be effective, convenient and safe in managing occupational-specific musculoskeletal disorders in musicians.

Evidence-informed physical therapy management of performance-related musculoskeletal disorders in musicians

Playing a musical instrument at an elite level is a highly complex motor skill. The regular daily training loads resulting from practice, rehearsals and performances place great demands on the neuromusculoskeletal systems of the body. As a consequence, performance-related musculoskeletal disorders (PRMDs) are globally recognized as common phenomena amongst professional orchestral musicians. These disorders create a significant financial burden to individuals and orchestras as well as lead to serious consequences to the musicians’ performance and ultimately their career. Physical therapists are experts in treating musculoskeletal injuries and are ideally placed to apply their skills to manage PRMDs in this hyper-functioning population, but there is little available evidence to guide specific injury management approaches. An Australia-wide survey of professional orchestral musicians revealed that the musicians attributed excessively high or sudden increase in playing-load as major contributors to their PRMDs. Therefore, facilitating musicians to better manage these loads should be a cornerstone of physical therapy management. The Sound Practice orchestral musicians work health and safety project used formative and process evaluation approaches to develop evidence-informed and clinically applicable physical therapy interventions, ultimately resulting in favorable outcomes. After these methodologies were employed, the intervention studies were conducted with a national cohort of professional musicians including: health education, onsite injury management, cross-training exercise regimes, performance postural analysis, and music performance biomechanics feedback. The outcomes of all these interventions will be discussed alongside a focussed review on the existing literature of these management strategies. Finally, a framework for best-practice physical therapy management of PRMDs in musicians will be provided.

Development of a specific exercise programme for professional orchestral musicians

Background Musculoskeletal problems are common in professional orchestral musicians, and little is known about effective prevention strategies. Exercise is suggested to help in reducing work-related upper limb disorders and accordingly a trial of a specific exercise programme for this population was planned. Formative and process evaluation procedures were undertaken during the development of the programme to ensure high methodological credibility. Methods Literature reviews on exercise interventions for musicians as well as for neck, shoulder, abdominal, lower back and hip/pelvic body regions were undertaken. Current preventative and rehabilitation models were reviewed including undergraduate curriculums, postgraduate training programmes, and opinion from academic and clinical physiotherapists. Five series of progressive exercises were developed as a result. These were reviewed by expert physiotherapists who were blinded to the proposed progression difficulty of the exercises. A revised draft was produced for further review. This final programme was pilot trialed and feedback from the participants and physiotherapist instructors were obtained. Results No evidence-based literature regarding an exercise programme for professional orchestral musicians was found. An exercise programme was subsequently developed with progressive stages that followed an adapted exercise prevention and rehabilitation model. The blinded ranking of each exercise series produced varied results particularly in the abdominal and shoulder series. Feedback from the participants and instructors in the pilot study resulted in changes to the exercise difficulty, and the class format and structure. Conclusions Using available evidence on exercise prescription in collaboration with clinical consensus and current best practice, a specific exercise programme was developed to prevent and/or reduce occupational injuries in professional orchestral musicians.

The usefulness of on-site physical therapy-led triage services for professional orchestral musicians – a national cohort study

BackgroundAustralian professional orchestral musicians reported a lifetime prevalence of musculoskeletal injuries that had interfered with playing at 84%. Physical therapy-led triage clinics may be a practical method to manage the impact of high performance-related musculoskeletal disorders (PRMDs) in professional orchestral musicians. This study aimed to: a) collect information on presenting injuries, b) determine the participant’s provisional diagnosis, c) evaluate uptake of an on-site triage service, d) measure participant satisfaction, and e) identify factors influencing attendance.MethodsEight triage sessions were run on a fortnightly basis during a designated lunch break between rehearsal calls in seven premier symphony orchestras in Australia; a total population of 483 musicians. The participants received one or a combination of: a) education and advice relating to their provisional diagnosis, b) basic acute management and/or c) a referral to a suitable medical practitioner or allied health professional for further consultation or treatment. A three-month follow-up questionnaire was completed and a qualitative narrative themes-based analysis was undertaken to summarise participant and physical therapist feedback. Uptake, participant satisfaction and factors influencing attendance were measured.Results99 initial consultations (83 individuals) were conducted with more females (61%) utilizing the service than males (49%). The most common injury complaints were in the shoulder (22%), neck (18%), upper back (18%), and hand (8%). 66% of these were diagnosed as PRMDs. Of these injuries, 94% were considered preventable, 93% continued to affect playing, 68% were severe requiring a referral for further management, and 46% were recurrent. The advice at the triage service was rated as helpful or very helpful by 79% of the musicians, whilst 68% responded they were likely or very likely to continue to use the service if it was offered in the future. Of the participants that followed through with the referral advice, 67% reported that the referral advice was helpful or very helpful. Musicians’ and physical therapists’ written feedback indicated their acknowledgement for the need of this service. The main suggestions for improving attendance were increasing the music-specific physical therapy knowledge of therapists and overcoming competing time demands.ConclusionOn-site health services for musicians may facilitate better injury management by providing immediate and specific health advice.Trial registrationACTRN12612000220864

Beighton scores and cut-offs across the lifespan: cross-sectional study of an Australian population

Objectives The primary aim of this study was to evaluate generalized joint hypermobility (GJH) according to the Beighton scoring system in an Australian population. Secondary aims were to identify whether the commonly used Beighton score cut-off of ⩾4 is appropriate, and to suggest age- and sex-specific Beighton score cut-offs across the lifespan. Methods A thousand individuals aged 3-101 years were assessed for GJH with the Beighton scoring system. Differences between age, sex and ethnicity were investigated. The appropriateness of the ⩾4 cut-off was investigated with use of a binary logistic regression. Each Beighton score cut-off was established as the nearest Beighton score that delineated the uppermost 5% of the population. Results Overall, females and non-Caucasians had higher Beighton scores across the lifespan (P < 0.001). Based on a binary logistic regression model, if a cut-off of ⩾4 was utilized, the Beighton scoring system demonstrated a sensitivity of 0.8% and a specificity of 99.3% (P < 0.001). A cut-off of ⩾4 was only found to be appropriate for females aged 40-59 years and males aged 8-39 years. Conclusion Beighton scores varied across the lifespan and were significantly influenced by age, sex and ethnicity. Assessing GJH using the Beighton scoring system required age- and sex-specific cut-off scores based on the uppermost 5% values. This was confirmed by the low sensitivity, high specificity and 60% false-positive rate if a cut-off of ⩾4 was used for both sexes across the lifespan. To lower the risk of a false-positive diagnosis of GJH, further tests of hypermobility need to be utilized.

The prevalence of generalized and syndromic hypermobility in elite Australian dancers

OBJECTIVES To determine the prevalence of Generalized Joint Hypermobility (GJH) and Joint Hypermobility Syndrome/Ehlers-Danlos Syndrome-Hypermobility Type (JHS/EDS-HT) among dancers using established validated measures. DESIGN Observational Cohort Study. SETTING Laboratory. PARTICIPANTS 85 dancers from two dance institutions. MAIN OUTCOME MEASURES GJH was determined using the Beighton score (cut-point ≥5/9) and the Lower Limb Assessment Scale (LLAS) (cut-point ≥7/12). Presence of JHS/EDS-HT was assessed using the Brighton and Villefranche criteria. Paired sample t-test was performed to compare LLAS side-to-side scores, and percentage disagreements calculated to determine differences between the two GJH and the two JHS/EDS-HT measures. RESULTS 72% of dancers met the Beighton cut-point for GJH, while 38% and 42% met the LLAS cut-point on the left and right respectively. The proportion of dancers identified with GJH was different when assessed using the Beighton compared to the left and right LLAS (both p < 0.001), a disagreement of 48% and 46% respectively, with Beighton classifying more participants as having GJH. The Villefranche identified more dancers with JHS/EDS-HT than the Brighton (84% vs 31%, p < 0.001), with 54% disagreement. CONCLUSIONS High prevalence of generalized and syndromic hypermobility was found regardless of the criteria used. A higher Beighton cut-point, e.g. ≥6/9, to identify true GJH amongst dancers maybe warranted.

Torso and Bowing Arm Three-Dimensional Joint Kinematics of Elite Cellists: Clinical and Pedagogical Implications for Practice

BACKGROUND Elite cello playing requires complex and refined motor control. Cellists are prone to right shoulder and thoracolumbar injuries. Research informing injury management of cellists and cello pedagogy is limited. The aims of this study were to quantify the torso, right shoulder, and elbow joint movement used by elite cellists while performing a fundamental playing task, a C major scale, under two volume conditions. METHODS An eight degrees of freedom upper limb biomechanical model was applied to 3D motion capture data of the torso, upper arm, and forearm for 31 cellists with a mean experience of 19.4 yrs (SD 9.1). Two-factor ANOVA compared the joint positions between the four cello strings and two volume conditions. FINDINGS Significant (p<0.05) effects were found for either the string and/or volume conditions across all torso, shoulder, and elbow joint degrees of freedom. The torso was consistently positioned in left rotation from 5.0° (SD 5.6) at the beginning of the scale, increasing to 16.3° (5.5) at its apogee. The greatest mean shoulder flexion, internal rotation, and abduction joint angles were observed when playing at the tip of the bow on the top string (A): 107.2° (11.6), 59.1° (7.1), and -76.9° (15.7), respectively, during loud playing. INTERPRETATION Elite cellists use specific movement patterns to achieve string crossings and volume regulation during fundamental playing tasks. Implications of the static left-rotated torso posture and high degrees of combined shoulder flexion and internal rotation can be used to inform clinical and pedagogical practices.