N/A N=44 Randomized Double-blind Treatment

Cranial Laser Reflex Technique for Hamstring Function

Hamstring Injury · Muscle Tone Increased · Muscle Pain · Muscle Weakness

Bottom Line

View on ClinicalTrials.gov: NCT03044106 ↗

Enrolled (actual)

Serious AEs

0.0%

Results posted

Jan 2019

Primary outcome: Primary: 90-90 Knee Extension Angle Test — 167.3; 166.4; 168.5; 168.8 degrees

Study Design & Population

Study type: Interventional
Phase: N/A
Interventions: CLRT (Device)
Age: Adult · 18+ yrs
Sex: All
Sponsor: University of North Carolina, Chapel Hill
Primary completion: Jul 2017

Outcome Measures

Outcome	Result	p-value
PRIMARY 90-90 Knee Extension Angle Test	167.3; 166.4; 168.5; 168.8	—
SECONDARY Handheld Dynamometry	17.2; 17.4; 16.9; 17.0	—
SECONDARY Pain Pressure Threshold	10.6; 11.0; 11.3; 11.5	—
SECONDARY Mean Difference Pre/Post KEA, Stratified by History of Prior Hamstring Strain	167.825; 168.4875; 167.1778; 165.9235; 171.65; 169.4875	0.0068 sig

Summary

Purpose: To conduct a pilot study of the effect of Cranial Laser Reflex Technique (CLRT) compared with sham laser on hamstring muscle flexibility, strength, and pain pressure threshold. Participants: Active, young adults ages 18 to 35. Procedures: A two-visit, assessor and participant-blinded crossover study with 1-week washout. Subjects will complete three functional hamstring tests before and after CLRT and sham laser treatment. Subjects will also complete questionnaires to assess their expectations and perceptions of the interventions.

Eligibility Criteria

Inclusion Criteria

Between 18-35 years of age
All genders
Willing to complete two study visits over 2-3 weeks
Able to read and communicate in English

Exclusion Criteria

Current lower back condition with pain, numbness or tingling that radiates down the legs
Active treatment for a major medical illness, such as heart disease, uncontrolled diabetes or hypertension, malignancy, autoimmune, or immune deficiency disorder
History of vasculitis, intracranial mass, clotting disorder (including medication-induced, e.g., warfarin)
Current skin malignancy on scalp
Cognitive dysfunction preventing informed consent
Pending or currently receiving benefits from personal injury litigation, including worker's compensation
Chronic long-term disability related to lumbosacral injury/symptoms
Epilepsy

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Data sourced from ClinicalTrials.gov (NCT03044106). Outcome figures and adverse-event rates are extracted automatically from the registry's posted results and are provided for clinician reference, not as a substitute for the primary publication.