Effects of Nunchaku Exercise for Improving Frozen Shoulder

Official title

Effects of Nunchaku Exercise on Adhesive Capsulitis (Frozen Shoulder) in Middle-aged and Older Adults: A Randomized Controlled Trial

Overview

The goal of this clinical trial is to investigate if nunchaku exercise works to treat adhesive capsulitis, or frozen shoulder in middle-aged or older adults. It will also learn about the adherence of this exercise intervention. The main questions it aims to answer are: * Does practicing nunchaku exercises help reduce shoulder pain and improve shoulder movement? * Do people stick with nunchaku exercises better, and spend more time practicing on their own, compared with standard exercises for alleviating frozen-shoulder? Researchers will compare nunchaku exercise to standard exercises for alleviating frozen-shoulder to see if nunchaku exercise works to alleviate frozen shoulder. Participants will: * Join small group exercise classes for 12 weeks, doing either nunchaku based exercises or standard exercises designed to help relieve frozen shoulder. * Have their shoulder pain and movement checked three times: * before training * after 6 weeks of training, * after finishing the 12 week program, and * 12 weeks after the program ends. * Keep a record of their home practice time.

Detailed description

Adhesive capsulitis, or frozen shoulder, is a progressive fibro-inflammatory condition characterized by synovitis, capsular thickening, and collagen remodeling, leading to substantial restrictions in active and passive shoulder motion. These movement limitations commonly result in impaired sleep, difficulties in self-care, and reduced capacity for work and leisure activities. Although conservative rehabilitation is the standard of care, real-world effectiveness is frequently constrained by poor adherence to home-based exercises, often due to discomfort and exercise monotony.

This randomized controlled trial investigates the effects of nunchaku exercise as a novel rehabilitative modality for individuals with adhesive capsulitis in the thawing phase. Nunchaku practice requires rhythmic, multiplanar arm motions, coordinated scapulohumeral control, and dynamic stabilization. These biomechanical characteristics align with therapeutic goals of end-range stretching, neuromuscular retraining, and rotator-cuff-based stabilization. The inherently rhythmic, skill-acquisition nature of nunchaku practice may also enhance intrinsic motivation and adherence relative to traditional exercise programs.

In this assessor-blinded, two-arm, parallel-group trial, 50 ethnic Chinese adults aged 45 years or older will be recruited and randomized 1:1 to either a standard shoulder mobilization and stretching exercise program (SMSE) or a nunchaku exercise program (NE). The nunchaku exercise program will adapt into a safe, soft-towel form suitable for older adults. Both interventions last 12 weeks and consist of twice-weekly, 60-minute, small-group sessions, supplemented by encouraged home practice. SMSE includes joint mobilization, end-range stretching, strengthening. NE follows the Level 1 nunchaku syllabus of the nunchaku system from the Hong Kong nunchaku association.

Outcomes will be assessed at baseline, week 6, week 12, and week 24. The primary outcome is the Shoulder Pain and Disability Index (SPADI). Secondary outcomes include the Visual Analog Scale for pain, Constant-Murley Score, pain-free range of motion, and intervention enjoyment (PACES-8). Adherence will be monitored through attendance, dropout rates, and weekly self-practice time.

This study aims to determine whether nunchaku exercise can improve adherence and produce superior clinical outcomes compared with standard rehabilitation in middle-aged and older adults with adhesive capsulitis.

Interventions

• Behavioral Shoulder Mobilization and Stretching Exercise (SMSE)
  Participants in this group will be offered a 12-week rehabilitation program consisting of two 60-minute sessions per week. This program has been designed by a registered physiotherapist in accordance with the Hospital Authority of Hong Kong's self-care guidelines. Each session includes joint mobilization exercises, end-range stretching using a towel or stick, and muscle-strengthening and stabilizing exercises. The training will be conducted in small groups by trained exercise instructors, and yo
• Behavioral Nunchaku Exercise
  Participants randomized to the Nunchaku Exercise group will participate in a 12-week training program consisting of two 60-minute sessions per week. To prioritize safety and minimize the risk of injury, you will use a soft towel with a knot at each end to simulate nunchaku movements (Figure 1). The training focuses on the level one syllabus of the standard nunchaku system, which involves rhythmic multi-angle movements, such as figure-eight trajectories and alternating hand transfers. Classes wil

Primary outcome measures

• Shoulder Pain and Disability Index (SPADI) [Time frame: From enrollment to the end of follow-up period at 24 weeks]

Secondary outcome measures (4)

• Visual Analog Scale for Pain (VAS) [Time frame: From enrollment to the end of follow-up period at 24 weeks]
• Constant-Murley Score (CMS) [Time frame: From enrollment to the end of follow-up period at 24 weeks]
• Pain-free Range of Motion (ROM) [Time frame: From enrollment to the end of follow-up period at 24 weeks]
• Enjoyment of intervention [Time frame: From mid-intervention at 6 weeks to to the end of follow-up period at 24 weeks]

Eligibility criteria

Inclusion criteria

• Ethnic Chinese;
• Age 45 years or above;
• Diagnosed with Adhesive Capsulitis (Frozen Shoulder) and currently in the thawing stage.

Exclusion criteria

• Presence of secondary causes of shoulder stiffness, including recent trauma, post-surgical stiffness, or structural lesions such as full-thickness rotator cuff tears or severe glenohumeral arthritis;
• Receipt of recent shoulder treatments known to influence short-term outcomes, including corticosteroid injections within the past three months, hydrodilatation, manipulation under anesthesia, arthroscopic capsular release within the past six months, or structured shoulder physiotherapy within the past three months;
• Presence of somatic conditions that limit their ability to participate safely in exercise (e.g., inability to walk without an assistive device).

Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.

Healthy volunteers: No

Study design

Allocation

Randomized

Model

Parallel assignment

Masking

Single blind

Primary purpose

Treatment

Study locations

Hong Kong · 1 center

• Department of Sports Science and Physical Education, The Chinese University of Hong Kong — Hong Kong

Identifiers

NCT: NCT07486193 · FS_nun_1

Primary sources (government registries)

• ClinicalTrials.gov (US NIH)

View this study on ClinicalTrials.gov ↗