Wun-Ting Luo1, Chieh-Jui Lee1, Ka-Wai Tam2,3,4,5,6, Tsai-Wei Huang6,7,8. 1. School of Medicine, College of Medicine, Taipei Medical University, Taipei. 2. Center for Evidence-Based Health Care, Taipei Medical University-Shuang Ho Hospital, New Taipei City. 3. Department of Medical Research, Taipei Medical University-Shuang Ho Hospital, New Taipei City. 4. Department of Surgery, School of Medicine, College of Medicine, Taipei Medical University, Taipei. 5. Department of Surgery, Taipei Medical University-Shuang Ho Hospital, New Taipei City. 6. Cochrane Taiwan, Taipei Medical University, Taipei. 7. Center for Nursing and Healthcare Research in Clinical Practice Application, Wan Fang Hospital, Taipei Medical University, Taipei. 8. School of Nursing, College of Nursing, Taipei Medical University, Taipei, Taiwan.
Abstract
CONTEXT: Athletes must maintain their peak state of strength. Previous studies have investigated the effect of low-level laser therapy (LLLT) on muscular performance. A previous systematic review and meta-analysis has investigated this issue in healthy participants but not in physically active athletes. OBJECTIVE: To investigate whether LLLT can improve muscular performance and soreness recovery in athletes. DATA SOURCES: PubMed, EMBASE, and Cochrane Library. STUDY SELECTION: Published randomized controlled trials and crossover studies till December 2020. STUDY DESIGN: Systematic review and meta-analysis. LEVEL OF EVIDENCE: Level 3. DATA EXTRACTION: Assessment of study quality was rated using the risk of bias assessment method for randomized trials (Cochrane Handbook for Systematic Reviews of Interventions). RESULTS: A total of 24 studies were included. LLLT application before exercise significantly improved lower-limb muscle strength in 24-hour, 48-hour, 96-hour, and 8-week follow-up groups. Furthermore, decreased soreness index, serum creatine kinase concentrations, interleukin-6, and thiobarbituric acid reactive substance concentrations and a trend toward the improvement of contract repetition number and VO2 kinetic outcomes were observed. CONCLUSION: Although a definite therapeutic effect of LLLT is yet to be established, the current evidence supports that LLLT use improves muscular performance in physically active athletes. Additional trials with large sample sizes and robust design should be conducted before strong recommendations are made.
CONTEXT: Athletes must maintain their peak state of strength. Previous studies have investigated the effect of low-level laser therapy (LLLT) on muscular performance. A previous systematic review and meta-analysis has investigated this issue in healthy participants but not in physically active athletes. OBJECTIVE: To investigate whether LLLT can improve muscular performance and soreness recovery in athletes. DATA SOURCES: PubMed, EMBASE, and Cochrane Library. STUDY SELECTION: Published randomized controlled trials and crossover studies till December 2020. STUDY DESIGN: Systematic review and meta-analysis. LEVEL OF EVIDENCE: Level 3. DATA EXTRACTION: Assessment of study quality was rated using the risk of bias assessment method for randomized trials (Cochrane Handbook for Systematic Reviews of Interventions). RESULTS: A total of 24 studies were included. LLLT application before exercise significantly improved lower-limb muscle strength in 24-hour, 48-hour, 96-hour, and 8-week follow-up groups. Furthermore, decreased soreness index, serum creatine kinase concentrations, interleukin-6, and thiobarbituric acid reactive substance concentrations and a trend toward the improvement of contract repetition number and VO2 kinetic outcomes were observed. CONCLUSION: Although a definite therapeutic effect of LLLT is yet to be established, the current evidence supports that LLLT use improves muscular performance in physically active athletes. Additional trials with large sample sizes and robust design should be conducted before strong recommendations are made.
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