Immediate Effects of Strain Counterstrain Versus Fascial Distortion Model on Upper Trapezius Latent Trigger Points

Kyungnam University

Status: Completed

Conditions: Upper Trapezius Muscle; Latent Myofascial Trigger Points

Treatments: Other: Fascial Distortion Model; Other: Strain Counterstrain

Study type: Interventional

Funder types: Other

Identifiers

NCT07368426

JYK-2025-02

Details and patient eligibility

About

This pilot study aimed to compare the immediate effects of two manual therapy techniques, strain counterstrain (SCS) and the fascial distortion model (FDM), on pain-related outcomes and neuromuscular function in individuals with latent myofascial trigger points of the upper trapezius muscle. Twenty healthy adults with identified latent trigger points were randomly assigned to receive a single session of either SCS or FDM. Cervical range of motion, proprioception, pressure pain threshold, and cervical muscle strength were assessed before and immediately after the intervention. This study was conducted to obtain preliminary data regarding the short-term effects of two manual therapy approaches with contrasting stimulation characteristics.

Full description

Musculoskeletal pain of the cervical region is a prevalent health problem, and the upper trapezius muscle is frequently involved due to postural overload and mechanical stress. These factors are commonly associated with the development of latent myofascial trigger points, which may restrict range of motion and impair neuromuscular function even in the absence of spontaneous pain.

Various manual therapy techniques have been used to manage myofascial trigger points. Strain counterstrain (SCS) is an indirect, low-intensity technique that aims to reduce nociceptive input and muscle spindle activity by positioning the body in a pain-free posture. In contrast, the fascial distortion model (FDM) is a direct manual therapy approach that applies relatively high-intensity pressure to specific fascial distortions identified through patient body language and palpation.

This study was designed as a pilot, parallel-group, pre-post comparative trial to explore the immediate effects of SCS and FDM on pain-related and neuromuscular outcomes in individuals with latent myofascial trigger points of the upper trapezius. Twenty healthy adults were randomly assigned to receive a single session of either SCS or FDM. Cervical range of motion, joint position error, pressure pain threshold, and cervical muscle strength were assessed before and immediately after the intervention. The findings of this study are intended to provide preliminary evidence to inform future large-scale clinical trials comparing manual therapy techniques with differing stimulation characteristics.

Enrollment: 20 patients

Sex: All

Ages: 18 to 39 years old

Volunteers: Accepts Healthy Volunteers

Inclusion criteria

• Healthy adults aged 18 to 39 years.
• Presence of latent myofascial trigger points in the upper trapezius muscle.
• No history of neurological or orthopedic disorders within the past six months.
• Willingness to participate and provision of written informed consent.

Exclusion criteria

• Current or previous complaints of neck or shoulder pain.
• Ongoing treatment for musculoskeletal conditions.
• History of physical therapy or chiropractic treatment within the past six months.
• History of surgery or trauma involving the head or upper trunk.

Trial design

Primary purpose: Treatment

Allocation: Randomized

Interventional model: Parallel Assignment

Masking: Single Blind

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20 participants in 2 patient groups

Strain Counterstrain Group

Experimental group

Description:

Participants received a single session of strain counterstrain manual therapy applied to latent myofascial trigger points of the upper trapezius muscle.

Treatment:

Other: Strain Counterstrain

Fascial Distortion Model Group

Experimental group

Description:

Participants received a single session of fascial distortion model manual therapy applied to latent myofascial trigger points of the upper trapezius muscle.

Treatment:

Other: Fascial Distortion Model