目的:评估近红外预照射对运动后下肢肌肉损伤和功能的影响,确定最佳剂量。
方法:PubMed,EMBASE,科克伦图书馆,EBSCO,WebofScience,CNKI(中国国家知识基础设施),系统搜索了万方数据(2009-2023年)。
方法:将近红外预照射对疲劳运动后下肢肌肉的随机对照试验纳入荟萃分析。在筛选的4550篇文章中,21符合纳入标准。
方法:纳入的研究特征由2位作者独立提取,通过讨论或第三作者解决了差异。质量评估利用了Cochrane偏差风险工具和评分系统。
结果:在21项研究中,对下肢肌肉的近红外预照射抑制了峰值扭矩的下降(SMD:1.33,95%CI:1.08至1.59,p<0.001,增加27.97±4.87NM),降低血乳酸(SMD:-0.2,95%CI:-0.37至-0.03,p=0.272,降低0.54±0.42mmol/L),肌酸激酶降低(SMD:-2.11,95%CI:-2.57至-1.65,p<0.001,降低160.07±27.96U/L),并减少延迟性肌肉酸痛(SMD:-0.53,95%CI:-0.81至0.24,p<0.001)。使用24小时截止显示两个趋势:治疗效果取决于功率和能量密度,最佳效果为24.16J/cm²和275J/cm²的能量,以及36.81mW/cm²和5495mW/cm²的功率。注意到在21项研究中,19人来自巴西,1来自美国,和1来自澳大利亚,结果表现出高度异质性结论::尽管我们更希望实验室的地理分散,但我们的发现表明近红外预照射减轻了下肢肌肉的峰值扭矩下降。受24小时阈值的能量和功率密度的影响,在24.16J/cm²处观察到最佳能量和功率密度,275J/cm²,36.81mW/cm²,和5495mW/cm²。它还能减少血乳酸,CK,和DOMS。
OBJECTIVE: To assess near-infrared preirradiation effects on postexercise lower-limb muscle damage and function and determine optimal dosage.
METHODS: PubMed, Embase, Cochrane Library, EBSCO, Web of Science, China National Knowledge Infrastructure, and Wanfang Data were systematically searched (2009-2023).
METHODS: Randomized controlled trials of near-infrared preirradiation on lower-limb muscles after fatigue exercise were incorporated into the meta-analysis. Out of 4550 articles screened, 21 met inclusion criteria.
METHODS: The included studies\' characteristics were independently extracted by 2 authors, with discrepancies resolved through discussion or by a third author. Quality assessment was performed using the Cochrane risk of bias tool and the Grading of Recommendations, Assessment, Development, and Evaluation System.
RESULTS: In 21 studies, near-infrared preirradiation on lower-limb muscles inhibited the decline in peak torque (standardized mean difference [SMD], 1.33; 95% confidence interval [CI], 1.08-1.59; p<.001; increasing 27.97±4.87N·m), reduced blood lactate (SMD, -0.2; 95% CI, -0.37 to -0.03; p=.272; decreasing 0.54±0.42mmol/L), decreased creatine kinase (SMD, -2.11; 95% CI, -2.57 to -1.65; p<.001; decreasing 160.07±27.96U/L), and reduced delayed-onset muscle soreness (SMD, -0.53; 95% CI, -0.81 to 0.24; p<.001). Using a 24-hour cutoff revealed 2 trends: treatment effectiveness depended on power and energy density, with optimal effects at 24.16 J/cm2 and 275 J/cm2 for energy, and 36.81 mW/cm2 and 5495 mW/cm2 for power. Noting that out of 21 studies, 19 are from Brazil, 1 from the United States, and 1 from Australia, and the results exhibit high heterogeneity.
CONCLUSIONS: Although we would have preferred a more geographic dispersion of laboratories, our findings indicate that near-infrared preirradiation mitigates peak torque decline in lower-limb muscles. Influenced by energy and power density with a 24-hour threshold, optimal energy and power densities are observed at 24.16 J/cm2, 275 J/cm2, 36.81 mW/cm2, and 5495 mW/cm2, respectively. Laser preirradiation also reduces blood lactate, creatine kinase, and delayed-onset muscle soreness.