Thoracic Expansion vs DNS Exercises in Forward Head Posture (FHP-DNS-TE)

Esra BECENI

Status: Not yet enrolling

Conditions: Forward Head Posture

Treatments: Behavioral: Thoracic Expansion Exercise; Behavioral: Dynamic Neuromuscular Stabilization Exercises

Study type: Interventional

Funder types: Other

Identifiers

NCT07238660

MU-FHP-DNS-TE-2025-01

Details and patient eligibility

About

This randomized controlled trial aims to compare the effects of thoracic expansion exercises and Dynamic Neuromuscular Stabilization (DNS) on respiratory function and bilateral trapezius muscle activity in individuals with forward head posture (FHP). A total of 32 participants aged 18-40 years with a craniovertebral angle (CVA) of less than 53° will be randomly assigned to either the DNS group or the thoracic expansion exercise group. Primary outcomes include respiratory function (FEV1, FVC, FEV1/FVC), trapezius muscle activation measured with EMG biofeedback, and craniovertebral angle. Secondary outcomes include thoracic mobility and health-related quality of life assessed using the St. George's Respiratory Questionnaire. Both interventions will be applied for 6 weeks. The study aims to determine which approach provides greater improvement in posture-related respiratory dysfunction and muscle activation.

Full description

Forward head posture (FHP) is a common postural deviation characterized by reduced craniovertebral angle (CVA), altered cervicothoracic alignment, and compensatory activation of accessory respiratory muscles. Individuals with FHP frequently demonstrate limited thoracic mobility, decreased respiratory efficiency, and increased demand on superficial neck musculature. These biomechanical alterations may negatively influence pulmonary function parameters such as FEV1 and FVC, as well as contribute to elevated electromyographic (EMG) activity in the upper trapezius muscles.

Various therapeutic approaches have been developed to address posture-related respiratory dysfunction. Thoracic expansion breathing exercises aim to enhance chest wall mobility and improve lung expansion across upper, middle, and lower thoracic regions. Dynamic Neuromuscular Stabilization (DNS), based on developmental kinesiology principles, seeks to optimize diaphragmatic function, intra-abdominal pressure regulation, and coordinated activation of deep stabilizing musculature. Although both methods have theoretical benefits for improving respiratory mechanics and postural alignment, comparative evidence regarding their differential effects in individuals with FHP remains limited.

This randomized controlled trial will investigate the immediate and short-term effects of thoracic expansion breathing exercises versus DNS-based stabilization exercises on respiratory function, cervicothoracic posture, and muscle activation patterns. Thirty-two adults aged 18-40 years with a CVA of less than 53° will be enrolled and randomly assigned using an opaque envelope method to one of two intervention groups: the Thoracic Expansion Exercise Group or the Dynamic Neuromuscular Stabilization Group. Each intervention protocol will be implemented over a 6-week period, consisting of twice-weekly supervised sessions complemented by twice-daily home exercise routines.

Outcome assessments will be conducted at baseline and at the end of the 6-week intervention period. These assessments will include: CVA measured by standardized lateral photography and ImageJ analysis; bilateral upper trapezius muscle activity assessed using surface EMG biofeedback; pulmonary function tests (FEV1, FVC, FEV1/FVC) conducted with spirometry; thoracic expansion measured at three levels using a tape-measure chest mobility test; and health-related quality of life evaluated with the St. George's Respiratory Questionnaire (SGRQ). The study protocol was approved by the Istanbul Medipol University Non-Interventional Clinical Research Ethics Committee.

This trial is designed to provide a comparative analysis of two commonly used physiotherapy interventions for FHP, with a focus on their effects on posture-related respiratory mechanics, thoracic mobility, and neuromuscular activation. All findings will be reported separately in the Results section. The present description outlines the scientific rationale, study design, and intervention procedures without duplicating eligibility criteria or outcome measure definitions.

Enrollment: 32 estimated patients

Sex: All

Ages: 18 to 40 years old

Volunteers: No Healthy Volunteers

Inclusion criteria

• Adults aged 18 to 40 years.
• Craniovertebral angle (CVA < 53°) indicating forward head posture.
• Able to perform exercise-based interventions.
• Voluntarily agrees to participate and signs the informed consent form.
• No neurological, orthopedic, systemic, or cardiopulmonary conditions that would limit participation.

Exclusion criteria

• Contraindications to exercise (e.g., acute musculoskeletal injury, uncontrolled cardiovascular disease).
• Chronic upper respiratory tract disease that may affect spirometry results. Presence of a cardiac pacemaker.
• Neurological disorders, systemic diseases, or mental impairments that could interfere with exercise cooperation.
• History of orthopedic or musculoskeletal surgery affecting mobility or posture.
• Currently participating in respiratory exercises, spinal stabilization training, or structured exercise programs.
• Engagement in professional sports or intensive physical training that may affect baseline neuromuscular measurements.
• Failure to comply with the exercise program (e.g., missing 3 consecutive days of prescribed exercises).

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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32 participants in 2 patient groups

Dynamic Neuromuscular Stabilization Group (DNSG)

Experimental group

Description:

Developmental DNS patterns (supine 90/90, prone on elbows, quadruped), performed twice daily for 6 weeks.

Treatment:

Behavioral: Dynamic Neuromuscular Stabilization Exercises

Thoracic Expansion Exercise Group (TEG)

Experimental group

Description:

Upper, middle, and lower lobe-focused thoracic expansion breathing exercises, twice daily for 6 weeks.

Treatment:

Behavioral: Thoracic Expansion Exercise