Red Light Therapy for Runners: Recovery, Timing and the Research
Red light therapy for runners has its best support for sore legs and for short lab running tests: a 2025 review found muscle soreness lower than placebo at 72 and 96 hours, and light on the legs a few minutes before a treadmill test let people run longer before exhaustion. It works as a small extra alongside good training, sleep and a gradual build in mileage. Below: timing around a run, sore legs, the running trials and their settings, common running complaints, a training block plan, safety and panel set-up.
Key takeaways
- A 2025 review of 14 controlled studies found muscle soreness lower than placebo at 72 and 96 hours when 660 to 950 nm light was applied to the worked muscles. Tsou, 2025
- In a crossover trial of 22 high-level football players, 810 nm light on the legs 5 minutes before a treadmill test extended time to exhaustion to 563.27 seconds, against 504.59 seconds with placebo. Tomazoni, 2019
- In a small trial in 20 male endurance runners, light on the legs before and after a run was followed by a 3000 m time about 7 seconds faster than with placebo. Lanferdini, 2021
- A 2022 review of lower-limb tendon pain and plantar heel pain found pain 14.98 mm lower than placebo on a 100 mm scale with laser light at recommended doses. Naterstad, 2022
- Novice runners had 17.8 injuries per 1,000 hours of running, against 7.7 for recreational runners, in a 2015 review of 13 studies. Videbæk, 2015
Does red light therapy for runners help?
It can help a little, mainly with muscle soreness in the days after hard sessions and with how long the legs last in lab running tests. Treat it as a small extra on top of good training, not a shortcut.
| Study | Who | Light and timing | What was found |
|---|---|---|---|
| Tsou, 2025 | 14 controlled studies | 660 to 950 nm, after hard exercise | Soreness lower than placebo at 72 and 96 hours |
| De Marchi, 2012 | 22 untrained men | 810 nm, 5 minutes before a treadmill test | Longer time to exhaustion, lower muscle damage markers |
| Tomazoni, 2019 | 22 football players | 810 nm, 5 minutes before a treadmill test | 563.27 against 504.59 seconds to exhaustion |
| Lanferdini, 2021 | 20 endurance runners | Before a 3000 m run and after the test | 3000 m about 7 seconds faster |
| Naterstad, 2022 | 18 trials, tendon and heel pain | Clinic lasers, often with exercise | Pain 14.98 mm lower than placebo at recommended doses |
A 2018 review of 39 trials with 861 participants found some effect in favour of light for time to exhaustion and repetitions, from evidence of very low to moderate quality. Vanin, 2018 Our guide to red light therapy for athletes covers the wider performance trials, where results for running times are still mixed.
Should runners use red light before or after a run?
Before, if you can manage it: most running trials lit the legs about 5 minutes before the run. After is also supported for soreness, so the main rule is to keep the session close to the run and on the legs you run on.
- Key sessions: for intervals, tempo runs or a race rehearsal, a short session on thighs and calves beforehand, then your normal warm-up.
- Long run: before works, and so does a session afterwards on the area that is usually sorest two days later.
Our athletes guide suggests finishing about 20 to 40 minutes before you start. Light does not replace five minutes of easy movement, and we have not seen evidence that a session hours later does the same job. Our article on red light therapy before or after a workout covers the timing research.
Can red light therapy for running recovery ease sore legs after a long run?
The closest evidence comes from soreness trials after hard exercise, where light on the worked muscles lowered soreness more than placebo at 72 and 96 hours. Those trials used lab exercise rather than races, so treat light as one part of recovery after a long run or marathon.
Normal muscle soreness starts one to three days after intense exercise, and Cleveland Clinic notes "It rarely lasts more than five days." Cleveland Clinic
Light before a hard session also showed up in recovery measures. A 2024 pooled analysis of 34 randomised trials of light before exercise found better strength recovery and lower creatine kinase, a blood marker of muscle damage. Li, 2024
The soreness review pooled only four studies, so its result is promising rather than proven; see the research on light and muscle recovery. Rest, easy movement, food and sleep do most of the work: "Athletic performance is reduced by a night or more without sleep." Walsh, 2021
Can red light help you run faster over 3000 m or 5K?
The results are encouraging in lab tests but small and early, so do not count on a faster race. The trial closest to real running is a small trial in 20 endurance runners.
Each runner did a 3000 m run with light and with placebo, 72 hours apart, and was about 7 seconds faster with light at the same effort rating. Lanferdini, 2021 Running economy, the energy cost of holding a pace, was 5% better 24 hours later.
Two lab trials timed a treadmill run to exhaustion that began 5 minutes after 810 nm light on the legs. In 22 untrained men, time to exhaustion and VO2max rose compared with placebo, and muscle damage markers were lower. De Marchi, 2012
Try any new routine in training before race day. Light on the skin is not on the World Anti-Doping Agency's prohibited list, as our athletes article explains; check the current list if you compete.
What settings did the running trials use?
The running trials used 810 nm near-infrared light on the thighs and calves, 30 to 100 seconds per point, a few minutes before the run. Tendon and knee trials gave light over several weeks alongside exercise.
| Trial or review | Light | Where | Dose and time | When | Schedule |
|---|---|---|---|---|---|
| De Marchi, 2012 | 810 nm laser | 12 sites per leg | 30 J, 30 seconds per site | 5 minutes before | One session |
| Tomazoni, 2019 | 810 nm laser | 17 sites per leg | 50 J, 100 seconds per site | 5 minutes before | One session |
| Vanin, 2018 (review) | 655 to 950 nm | Exercised muscles | 20 to 60 J small muscles, 60 to 300 J large | Mostly before | Varied |
| Stergioulas, 2008 | 820 nm laser | Achilles, 6 points | 5.4 J per session | With calf exercises | 12 sessions over 8 weeks |
| Allam, 2025 | Laser | 6 knee points | 4 J, 80 seconds per point | With exercise | Twice a week, 4 weeks |
Both lab trials covered the thigh front, hamstrings and calf. The knee figures come from a trial in 60 people with kneecap pain. Allam, 2025
All of these put light on the skin at set points, and joules per point do not convert into panel minutes. The pattern carries over: red and near-infrared light, thighs and calves, close to the run.
Which leg muscles should a runner light, and in what order?
The running trials lit the front of the thighs, the hamstrings and the calves, so those are the main targets. On a half-body panel, treat each of those as its own session.
- Thighs: both together at about 12 inches, front first, then turn around for the hamstrings.
- Calves: both together at about 12 inches, or one calf at about 6 inches.
- Shin or Achilles: about 6 inches, side-on or from behind for the Achilles; starting further back, at about 12 inches, is fine.
- Sole of the foot: sit with the foot turned towards the panel at about 6 inches.
If you only have time for one area, choose the one that is usually sorest two days after your long run.
Can red light help shin splints, Achilles pain or runner's knee?
The closest evidence comes from trials in lower-limb tendon pain and plantar heel pain, where clinic lasers lowered pain more than placebo. The gain was larger when light was added to exercise, so light fits alongside rest, load changes and physiotherapy.
In that 2022 review, pain was 18.15 mm lower on a 100 mm scale when light was added to an exercise programme. Naterstad, 2022
- Shin splints: the NHS advises ice for up to 20 minutes every 2 to 3 hours, a switch to swimming or yoga, and a gradual build back. NHS See our shin splints guide.
- Achilles pain: with calf exercises, pain during activity was 37.3 with light against 62.8 with placebo at 8 weeks, in 52 recreational athletes. Stergioulas, 2008 See red light therapy for Achilles tendonitis.
- Runner's knee: Mayo Clinic advises avoiding painful activities, physical therapy for strength and running form, and ice after exercise. Mayo Clinic Our knee pain article covers the light research.
- Plantar heel pain: it affects about 1 in 10 adults, and an NHS leaflet advises calf and foot stretches at least twice a day. Oxford University Hospitals
The same leaflet suggests new trainers every 300 to 500 miles. Footwear, load and form come first.
How should a runner fit red light into a marathon training block?
Use short sessions on run days, mainly before key sessions or after the long run, and keep the bigger factors first: gradual load, sleep and rest days. Our weekly plans come to about an hour of light a week, and rest-day sessions are the first to drop.
The International Olympic Committee's consensus on training load states that "poor load management is a major risk factor for injury". Soligard, 2016 It advises keeping weekly increases under 10%.
- Interval or tempo day: 10 to 15 minutes on the thighs or calves before, then your warm-up.
- Easy run: nothing needed, or a short session on whatever is sore.
- Long run: about 10 minutes on calves and thighs after, or before if that suits you better.
- Rest day: optional, and the first session to cut.
Coming back from injury, an NHS physiotherapy programme starts running once you are "pain free when fast walking for 30 minutes". Oxford University Hospitals
Is red light safe for runners with sunburned legs, chafing or a fresh strain?
Leave those areas out: the panel is not for use after sunburn on the body in the past 2 weeks, never over broken skin, and not in the first 2 to 3 days after a fresh sprain or strain. Ice and rest come first for a new injury.
- Summer running: sunburned legs or shoulders mean waiting 2 weeks before using the panel.
- Blisters and chafing: skip any area with broken skin until it has fully closed.
- Eyes: Cleveland Clinic advises home users to "shield your eyes for protection". Cleveland Clinic Wear the goggles even with the panel at foot level.
Ibuprofen and naproxen, which many runners take, can make skin more sensitive to light. Our precautions rule out photosensitising medication, so anyone taking a medicine should check with their pharmacist or doctor before using the device.
The panel is also not for use if you are pregnant, breastfeeding or preparing for pregnancy, have epilepsy or seizures triggered by light, have a thyroid condition or take thyroid medication, or have Fitzpatrick skin type V or VI.
Which running pains need a physio or doctor before light?
Pain at one spot on a bone, a pop at the back of the ankle, a knee that locks or gives way, or a swollen, red, painful calf needs checking before any light. So does dark urine or severe muscle pain and swelling after a race.
- Bone pain: tenderness at one small spot, or pain at rest or at night, can mean a stress fracture.
- Achilles: a sudden pop or snap, or being unable to push off or stand on tiptoe.
- Knee: locking, giving way, a hot or badly swollen joint, or a leg that cannot bear weight.
- After a race: Cleveland Clinic lists dark or bloody urine, severe swelling and sharp constant pain as reasons to see a doctor. Cleveland Clinic
How do you set up a Kivorla panel for runners' legs and feet?
Hang the panel low on a door or wall, or stand it upright on the floor, put the goggles on and place your legs or feet about 6 to 12 inches away. Run the red and near-infrared channels for 10 to 15 minutes per area, close to your run.
The 9-Spectrum Red Light Therapy Panel carries 480, 590, 630, 660, 670, 810, 830, 850 and 1060 nm, each dimmable from 1 to 100%. Its 810, 830 and 850 nm channels sit beside the 810 nm used in the running trials.
- Position: hang it with the included door hook, pulley, hanging cables and screws, low enough for your thighs or calves, or stand it on the floor.
- Channels: red and near-infrared on; 480 and 590 nm off. Continuous light is the simple default.
- Timer: 10 to 15 minutes per area. It runs from 1 to 30 minutes, and if no time is set the panel stops at 5 minutes.
- Skin: bare, clean, dry legs, with socks, tape and compression sleeves off.
- Goggles: on for every session, eyes closed, and never look into the panel.
- Heat: the surface stays at or below 40°C. Warm is fine; hot means stop or step back.
The running trials gave short times at set points. To stay closer to that range, use a shorter timer, turn the channels down from 100%, or step back to 12 inches. Leave at least 6 hours between 30-minute sessions. The panel comes with goggles and a controller; our face mask is shaped for the face only.
Standard shipping to the US, UK and Germany is free. Read the precautions before ordering. Under our return and refund policy, returns are accepted within 30 days: an unopened device with its seals intact is refunded less a 10% restocking fee, and an opened device that is undamaged and complete is refunded less 20%.
Kivorla devices are general wellness devices, not medical devices, and are not intended to treat running injuries. See a physiotherapist or doctor for bone pain, a pop in the tendon or a swollen calf, and keep the exercises and training plan your physio has set.