Crow Joshua A, Stauffer John W, Levine David, Dale R Barry, Borsa Paul A
Pain Research and Intervention Center of Excellence, Department of Community Dentistry and Behavioral Science, College of Dentistry, University of Florida, Gainesville.
Department of Applied Physiology and Kinesiology, College of Health and Human Performance, University of Florida, Gainesville.
J Athl Train. 2024 Jul 1;59(7):724-730. doi: 10.4085/1062-6050-0171.23.
Photobiomodulation therapy (PBMT) applied as a preconditioning treatment before exercise has been shown to attenuate fatigue and improve skeletal muscle contractile function during high-intensity resistance exercise. Practical implications for preconditioning muscles with PBMT before fatiguing exercise include a safe and noninvasive means to enhance performance and reduce the risk of musculoskeletal injury.
To examine the muscle fatigue-attenuating effects of PBMT on performance of the shoulder external-rotator muscle group when applied as a preconditioning treatment before high-intensity, high-volume resistance exercise.
Sham-controlled, crossover design.
Laboratory.
Twenty healthy men (n = 8) and women (n = 12) between the ages of 18 and 30 years.
INTERVENTION(S): Photobiomodulation therapy was administered using a near-infrared laser (λ = 810/980 N·m, 1.8 W/cm2, treatment area = 80-120 cm2) to the shoulder external-rotator muscles at a radiant exposure of 10 J/cm2. Participants performed 12 sets of isokinetic shoulder exercise. Each set consisted of 21 concentric contractions of internal and external rotation at 60°/s. The sets were subdivided into 3 blocks of exercise (block 1: sets 1-4; block 2: sets 5-8; block 3: sets 9-12).
MAIN OUTCOME MEASURE(S): Normalized peak torque (N·m/kg), average peak torque (N·m), total work (N·m), and average power (W).
During the last block of exercise (sets 9-12), all performance measures for the active PBMT condition were 6.2% to 10% greater than the sham PBMT values (P < .02 to P < .001).
Photobiomodulation therapy attenuated fatigue and improved muscular performance of the shoulder external rotators in the latter stages of strenuous resistance exercise.
光生物调节疗法（PBMT）作为运动前的预处理已被证明可减轻疲劳，并在高强度抗阻运动期间改善骨骼肌收缩功能。在疲劳运动前用PBMT预处理肌肉的实际意义包括一种安全且无创的提高运动表现和降低肌肉骨骼损伤风险的方法。
研究PBMT作为高强度、大运动量抗阻运动前的预处理时，对肩部外旋肌群运动表现的肌肉疲劳减轻作用。
假对照交叉设计。
实验室。
20名年龄在18至30岁之间的健康男性（n = 8）和女性（n = 12）。
使用近红外激光（λ = 810/980 N·m，1.8 W/cm²，治疗面积 = 80 - 120 cm²）对肩部外旋肌进行光生物调节疗法，辐射暴露量为10 J/cm²。参与者进行12组等速肩部运动。每组包括以60°/s进行21次内旋和外旋的向心收缩。这些组被细分为3个运动块（块1：第1 - 4组；块2：第5 - 8组；块3：第9 - 12组）。
标准化峰值扭矩（N·m/kg）、平均峰值扭矩（N·m）、总功（N·m）和平均功率（W）。
在运动的最后一个块（第9 - 12组）中，主动PBMT组的所有运动表现指标均比假PBMT组的值高6.2%至10%（P <.02至P <.001）。
光生物调节疗法在剧烈抗阻运动后期减轻了肩部外旋肌的疲劳并改善了肌肉表现。
