Red Light Therapy for Shin Splints & Running Injuries

Running injuries are frustratingly predictable. Each year, between 37 and 56 per cent of recreational runners sustain an injury that disrupts their training. Shin splints alone account for approximately 13 to 17 per cent of all running injuries, followed closely by ankle sprains, Achilles tendinopathy, and plantar fasciitis.

The standard treatment for most running injuries follows the same pattern: rest, ice, anti-inflammatory medication, and gradual return to activity. Red light therapy offers a complementary approach that targets the underlying tissue damage rather than merely masking symptoms — and the evidence for its use in musculoskeletal recovery is substantial.

Shin splints (medial tibial stress syndrome)

Shin splints — medically termed medial tibial stress syndrome (MTSS) — cause pain along the inner edge of the shinbone. The condition involves inflammation and microdamage to the periosteum (the membrane covering the bone), the tibialis posterior muscle, and the surrounding connective tissue.

In severe or chronic cases, MTSS can progress to tibial stress fractures, making early and effective treatment important.

How red light therapy helps

Red light therapy addresses shin splints through several mechanisms:

Anti-inflammatory action. The periosteal inflammation driving shin splint pain responds to photobiomodulation. Hamblin (2017) demonstrated that red and near-infrared light reduce TNF-alpha, IL-1beta, and IL-6 — the key inflammatory cytokines involved in musculoskeletal inflammation (AIMS Biophysics, 4(3), 337-361).

Bone and periosteal healing. Near-infrared light at 850nm penetrates to the bone surface and has been shown to stimulate osteoblast activity and periosteal repair. Pinheiro et al. (2006) demonstrated enhanced bone repair with 830nm laser therapy in an animal model (Photomedicine and Laser Surgery, 24(5), 642-647).

Pain modulation. Red light therapy has a direct analgesic effect, partly through modulation of nerve conduction velocity and partly through reduction of inflammatory mediators that sensitise nociceptors. Bjordal et al. (2003) conducted a systematic review confirming that LLLT provides clinically significant pain relief in musculoskeletal conditions (Australian Journal of Physiotherapy, 49(2), 107-116).

Protocol for shin splints

Wavelength: 850nm (near-infrared) preferred for periosteal penetration; 660nm (red) as adjunct for superficial inflammation
Dose: 4 to 8 J/cm² per treatment point
Application: Treat along the medial tibial border, covering the full length of the painful area. Use 3 to 4 treatment points spaced 2 to 3cm apart.
Frequency: Daily during the acute phase (first 1 to 2 weeks), then every other day during recovery
Duration: 4 to 6 weeks, combined with relative rest and gradual return to running
Device: A wrap or handheld device applied directly to the shin. A small panel can work but maintaining contact with the curved tibial surface is easier with a flexible device.

Ankle sprains

Ankle sprains — particularly lateral (inversion) sprains damaging the anterior talofibular ligament — are common in runners who train on uneven terrain, trails, or worn-out shoes. The injury involves partial or complete tearing of ligament fibres, local inflammation, bleeding, and swelling.

Evidence for red light therapy

Stergioulas (2004) conducted a randomised, double-blind, placebo-controlled trial of 820nm laser therapy for acute ankle sprains. The treatment group showed:

Significantly faster return to weight-bearing activities
Reduced swelling at days 3, 7, and 14 post-injury
Lower pain scores throughout the recovery period

The treatment group returned to sport approximately 4 days earlier than the placebo group — a meaningful difference for active individuals.

de Bie et al. (1998) also studied 904nm pulsed laser therapy for ankle sprains and found a statistically significant improvement in functional outcomes at 10 days post-injury (British Journal of Sports Medicine, 32(4), 314-320).

Protocol for ankle sprains

Wavelength: 820 to 850nm (near-infrared) — ligaments sit deep within the joint and require penetrating wavelengths
Dose: 4 to 6 J/cm² per treatment point
Application: Treat the anterior and lateral aspects of the ankle, focusing on the damaged ligament area. Apply to 4 to 6 points around the joint.
Timing: Begin as soon as possible after injury — ideally within 24 to 48 hours
Frequency: Daily for the first 7 to 10 days, then every other day
Duration: Continue until functional recovery is complete (typically 2 to 6 weeks depending on severity)
Combine with: PRICE protocol (Protection, Rest, Ice, Compression, Elevation) during the acute phase, followed by progressive rehabilitation exercises

Achilles tendinopathy

Achilles tendinopathy — pain and dysfunction of the Achilles tendon — is one of the most stubborn running injuries. The condition involves degenerative changes in the tendon collagen, often with neovascularisation (abnormal blood vessel growth) and chronic low-grade inflammation.

Evidence

Tumilty et al. (2010) conducted a systematic review of LLLT for Achilles tendinopathy and found moderate evidence supporting its effectiveness for pain reduction and functional improvement (Photomedicine and Laser Surgery, 28(1), 3-16). The optimal parameters identified were near-infrared wavelengths (780 to 860nm) at doses of 2 to 8 J/cm².

Bjordal et al. (2006) recommended that LLLT for tendinopathy should use wavelengths of 780 to 860nm, with the laser or LED applied directly over the tendon at multiple points (Photomedicine and Laser Surgery, 24(2), 158-168).

Protocol for Achilles tendinopathy

Wavelength: 850nm (the Achilles tendon is superficial but thick — 5 to 7mm — and NIR ensures full-thickness penetration)
Dose: 4 to 8 J/cm² per point, 3 to 5 treatment points along the tendon
Frequency: Daily during acute flare-ups, 3 times per week for chronic tendinopathy
Duration: 6 to 12 weeks. Achilles tendinopathy is notoriously slow to resolve regardless of treatment.
Combine with: Eccentric heel drop exercises (the gold standard rehabilitation for Achilles tendinopathy)

Pre-exercise and post-exercise use

Beyond treating specific injuries, there is growing evidence that red light therapy applied before or after exercise can reduce muscle damage and accelerate recovery.

Leal-Junior et al. (2015) conducted a systematic review and meta-analysis of photobiomodulation for exercise performance and recovery. They found that pre-exercise application:

Reduced creatine kinase levels (a marker of muscle damage) by a mean of 18 per cent
Decreased lactate accumulation
Improved time to exhaustion

Post-exercise application reduced delayed-onset muscle soreness (DOMS) and accelerated recovery of muscle function (Lasers in Medical Science, 30(2), 925-939).

For runners, this translates to a practical protocol:

Before a run: 3 to 5 minutes of 660nm + 850nm light applied to major muscle groups (quadriceps, calves, hamstrings). This may reduce post-run soreness and muscle damage.
After a run: 5 to 10 minutes of treatment to fatigued muscles and any areas of recurring discomfort. Focus on known problem areas (shins, Achilles, knees).

Device recommendations for runners

For shin splints and Achilles: A flexible wrap that conforms to the lower leg is the most practical option. Look for dual wavelength (660nm + 850nm) with adjustable fit. See our best body wraps page.

For ankle sprains: A handheld device allows precise targeting of ligament damage around the complex ankle joint anatomy. Wraps designed for larger joints may not provide optimal coverage for the ankle.

For general recovery: A medium-sized panel (half-body) allows you to treat large muscle groups efficiently after training sessions. Position the panel to cover the front and back of the legs in separate sessions.

The bottom line

Red light therapy has a solid evidence base for the treatment of common running injuries. Shin splints, ankle sprains, and Achilles tendinopathy have all been studied in controlled trials, with results showing reduced pain, faster healing, and earlier return to activity.

The therapy works best as a complement to, not a replacement for, proper rehabilitation. Rest, progressive loading, physiotherapy exercises, and addressing the underlying causes (training errors, footwear, biomechanics) remain essential. Red light therapy accelerates the biological healing processes that underpin recovery.

For runners, the additional evidence supporting pre-exercise and post-exercise application makes a red light device a versatile tool for both injury treatment and routine recovery. The risk is negligible, the evidence is credible, and the practical barrier to use is low — particularly with wearable wraps that can be applied during stretching or while icing.