Background: The effect of mobilization on lumbar back pain has been fully described in several clinical aspects, but evidence for muscle strength would be still less clear.
Objective: To assess the effect of lumbar mobilization on lower limb strength in healthy individuals.
Methods and Analysis: Healthy people aged 18-65 will be included regardless of race or sex. Original peer-reviewed primary reporting randomized controlled trials (RCTs) will be included. Electronic databases, such as MEDLINE, EMBASE, Cochrane Central Register of Controlled Trials, Web of Science, Pedro, CINAHL, ClinicalTrials.gov will be searched from inception until July 30. Only studies published in English will be included in this review. Two reviewers will complete the screening for eligibility independently, and the other two reviewers will also complete the risks of data extraction and bias assessment independently. Lower Limb strength will be assessed as primary outcome, and particular intervention or participant characteristics will be assessed as the secondary outcomes. Meta-analysis will be conducted using Review Manager 5.3.3, and evidence level will be assessed using the method for Grading of Recommendations Assessment, Development and Evaluation. Outcomes will be presented as the weighted mean difference or standardized mean difference with 95% CI. If I2 ≤ 50%, P>.1, the fixed effect model will be used, otherwise, random-effects model will be used. Ethics and dissemination: This review might not be necessary ethical approval because it does not require individual patient’s data; these findings will be published in conference presentations or peer-reviewed journal articles. PROSPERO registration number: CRD42020150144.

INTRODUCTION
    Rationale
    Objectives
    Methods and analysis
    Study records
    Data items
    Data synthesis
ETHICS AND DISSEMINATION
REFERENCES

• Wansuk Choi(Department of Physical Therapy, International University of Korea)
• Taeseok Choi(Department of Physical Therapy, Howon University)
• Hojung An(Department of Physical Therapy, Dongnam Health University)
• Jisung Kim(Department of Physical Therapy, Suwon Women's University)
• Seoyoon Heo(Department of Occupational Therapy, School of medical and Health Care, Kyungbok University) correspondence