Research Shows Red Light Therapy Prevents Muscle Soreness and Fatigue
This is an overview of the clinical research on light therapy and the prevention of muscle soreness, with samples from representative studies and trials published in peer-reviewed journals.
Less delayed onset muscle soreness: Delayed onset muscle soreness (DOMS) is pain and stiffness you feel 24 to 72 hours after a workout or strenuous activity. A double-blind, randomized trial assessed light therapy, exercise, and DOMS, and concluded:
- “The light therapy group exhibited a significant decrease in pain associated with DOMS.”
- “The McGill Pain Questionnaire showed a significant difference in pain scores at the 48-hour period.”
- Conclusion: Light therapy “provides a beneficial effect to patients who may experience DOMS after an exercise session.” 
A 2014 trial assessed the skeletal muscular performance and recovery after exercise for healthy men. The researchers found that pre-exercise light therapy “significantly increases performance, decreases DOMS, and improves biochemical markers related to skeletal muscle damage.”  This aligns with previous research showing red light therapy treatments before exercise delay the onset of muscle fatigue.  Less soreness & damage after intense workouts: A 2014 trial tested red light therapy for the muscle recovery of healthy young men after undergoing a “damaging eccentric exercise.” The light therapy group showed significantly reduced muscle strength loss, less muscle soreness, and fewer range of motion impairments, and that was demonstrated up to 4 days after a damaging exercise. 
Postmenopausal women feel less soreness from exercise: Light therapy has proven clinically effective at reducing muscle soreness for a wide range of populations, with especially encouraging results for postmenopausal women combining red light therapy with exercise.
In addition to improving quadricep performance, a 2014 trial also found that red light therapy “reduces peripheral fatigue in postmenopausal women.”  Infrared-LED therapy associated with treadmill training has also been shown to improve muscle power and delay leg fatigue in postmenopausal women. 
Less running damage: A 2012 trial concluded that runners in the light therapy group experienced decreased “exercise-induced oxidative stress and muscle damage.” Researchers stated that the modulation of the redox system (reducing oxidative stress) by light therapy likely led to a delay and reduction in skeletal muscle fatigue after running. 
Less knee muscle fatigue: A recent 2018 study found that red light therapy applied before and after exercise reduced knee muscle fatigue.  Similar results of a trial on knee muscle fatigue in 2010 found that light therapy before exercise was an effective way to prevent the increase of muscle proteins in the blood serum.” 
Fighting inflammation: Research shows red light therapy also helps reduce inflammation that can lead to cell damage. [13,14,15]
That research is backed up by the experiences of Joovv users every day, like Jorge Cruise, one of Hollywood’s top personal trainers. He told us he recommends Joovv to his celebrity clients because inflammation pain is the #1 reason people miss their workouts. He says Joovv minimizes pain and keeps his clients in the gym. We wrote an article about how red light therapy reduces inflammation if you want to learn more. You can also check out this article about relieving joint pain.
Lower creatine kinase levels point to less muscle damage with light therapy: Creatine kinase (CK) is a vital enzyme in your body that you make in greater numbers in response to muscle damage and tissue injury. As a result, it’s commonly used in blood tests to assess muscle damage. 
Many studies have shown a stark decrease in CK levels for light therapy groups versus placebo and control groups.
A recent 2018 systematic review and meta-analysis was conducted in the Clinical Journal of Sports Medicine, to assess the muscular effects of light therapy, especially concerning creatine kinase levels after exercise. After reviewing 14 studies, the authors concluded that light therapy has a positive effect on the control of creatine kinase activity. 
Large Base of Clinical Research Shows Red Light Therapy Enhances Muscle Recovery
Red light therapy’s healing and regenerating effects on muscle recovery have been shown across numerous trials, and it’s backed up by all the pro athletes and world-class trainers who swear by Joovv for muscle recovery every day at the highest levels of competition.
In 2015, researchers performed a systematic review and meta-analysis of numerous randomized, placebo-controlled trials on red light therapy and muscular recovery and performance. Based on the body of research, the authors concluded that red light therapy “improves muscular performance and accelerates recovery.” 
Pro Athletes Use Red Light Therapy for Muscle Recovery
The clinical results match the muscle recovery benefits Joovv users see every day, including many pro athletes.
TJ Dillashaw is one of the great fighters of the era. He’s the current UFC bantamweight champion, a title he’s holding for the second time now, at 32 years old, in one of the most physically grueling competitions on the planet. TJ uses Joovv every day and wrote a guest post in 2018 about the importance of the recovery phase of training, especially as athletes age and try to stay healthy.
Pro volleyball players recover faster with red light: Beach volleyball is incredibly taxing on leg and stomach muscles, but top players have responded extremely well to red light therapy.
A double-blind, placebo-controlled trial tested pro volleyball players and found this about the light therapy group:
“Post-exercise levels of biochemical markers decreased significantly: Blood Lactate, Creatine Kinase, and C-Reactive Protein levels.” 
That wouldn’t surprise Olympic volleyball star Lauren Fendrick. Lauren is one of the best beach volleyball players in the world and she’s Joovvin’ too. Lauren competed for Team USA at the Rio Olympics in 2016, and has her eyes set on 2020 in Tokyo. She talked to Joovv and told us her biggest lesson learned from competing in her first Olympics was that she needed to focus more on recovery.
Research shows pro soccer & rugby players recover faster with red light therapy: Recent clinical studies on professional rugby and soccer players assessed male athletes’ endurance, speed, and ability to recover from demanding games and workouts. Researchers found that red light therapy accelerated the players’ recovery times, leading the authors of both studies to recommend red light therapy for athletic recovery.
The results on the rugby field matched the lab results: rugby players receiving light therapy treatments saw a “significantly decreased percentage of change in blood lactate levels (p ≤ 0.05) and perceived fatigue (p ≤ 0.05).” [20,21]
Endurance Athletes Trust Joovv Red Light Therapy
Recovering from demanding workouts: Researchers in the 2014 trial cited above found light therapy lessens muscle soreness after strenuous exercise, and also that a single red light therapy treatment immediately after a damaging exercise was effective at reducing muscle soreness and strength loss. 
Quicker recovery for postmenopausal women: As with the research on preventing muscle fatigue, postmenopausal women showed impressive muscle recovery results with red light therapy. In 2013, a team of researchers analyzed the exercise tolerance and muscle recovery of 30 postmenopausal women over 6 months. One group received near infrared light therapy and did treadmill training, the other just the treadmill.
Researchers found that “time of recovery showed a significant decrease only in the LED group.” They concluded that light therapy and training “can improve maximal performance and post-exercise recovery in postmenopausal women.” 
Red light therapy beats cryotherapy for muscle recovery in clinical tests: A 2016 study evaluated both cryotherapy and red light therapy for muscle recovery. Researchers found that light therapy alone was “optimal for post-exercise recovery,” with decreased DOMS and creatine kinase activity versus placebo or cryotherapy. They concluded that light therapy by itself led to “complete recovery to baseline levels from 24 hours after high-intensity eccentric contractions.” 
These positive results build on a base of earlier research. For example, a 1990 study assessed numerous soft-tissue injuries and concluded light therapy was an effective recovery method, with significantly increased healing times. 
Bottom Line: Red and Infrared Light Therapy Speeds Muscle Recovery and Prevents Muscle Soreness
Study after study has shown red light therapy both prevents muscle soreness, and speeds muscle recovery after exercise.
You don’t have to be an Olympian to see the benefits of. Clinical research has demonstrated red light therapy’s effectiveness with men and women, from young adults to seniors, and across the fitness spectrum, from professional athletes to everyday "Joes and Janes".
Scientific Sources and Medical References:
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Tullberg M, Alstergren PJ, Ernberg MM. Effects of low-power laser exposure on masseter muscle pain and microcirculation. Pain. 2003;105:89–96.
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Baroni BM, et al. Low level laser therapy before eccentric exercise reduces muscle damage markers in humans. Eur J Appl Physiol. 2010 Nov;110(4):789-96.
Bjordal JM, Lopes-Martins RA, Iversen VV. A randomised, placebo controlled trial of low level laser therapy for activated achilles tendinitis with microdialysis measurement of peritendinous prostaglandin E2 concentrations. Br J Sports Med. 2006;40:76–80.
Aimbire F, Albertini R, Pacheco MT, et al. Low-level laser therapy induces dose-dependent reduction of TNF alpha levels in acute inflammation. Photomed Laser Surg. 2006;24:33–37.
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University of Rochester Medical Center. Health Encyclopedia, Creatine Kinase.
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Leal Junior EC, Lopes-Martins RA, Rossi RP, et al. Effect of cluster multi-diode light emitting diode therapy (LEDT) on exercise-induced skeletal muscle fatigue and skeletal muscle recovery in humans. Lasers in Surgical Medicine. 2009 Oct;41(8):572-7.
Pinto HD, Vanin AA, et al. Photobiomodulation Therapy Improves Performance and Accelerates Recovery of High-Level Rugby Players in Field Test: A Randomized, Crossover, Double-Blind, Placebo-Controlled Clinical Study. Journal of Strength and Conditioning Research. 2016 Dec;30(12):3329-3338.
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