Researchfor runners.

Active low-level laser treatment improved rest- and activity-related heel pain compared with placebo.

Population / model

30 adults enrolled; 25 completed

Design & comparison

904 nm laser versus placebo; six-week treatment

Measured outcome

Pain and ultrasound measures at six weeks.

Design & scope

Double-blind placebo comparison with 25 completers from 30 enrolled; six-week pain and ultrasound assessment.

Connection to the conversation

Published six-week plantar fasciitis trial.

Ultrasonographic evaluation of plantar fasciitis after low-level laser therapy: results of a double-blind, randomized, placebo-controlled trial.

Reviewed 22 October 2026

Six sessions over three weeks produced greater pain improvement than placebo, with follow-up through week eight.

Population / model

69 participants: 37 active, 32 placebo

Design & comparison

635 nm laser; six sessions over three weeks versus placebo

Measured outcome

Mean pain improvement: 29.6/100 active versus 5.4/100 placebo. The difference in improvement is 24.2/100, or 2.42 points on a 0–10 scale.

Design & scope

Randomized placebo comparison; manufacturer involvement disclosed in the study. Chart values are converted from the reported 0–100 scale.

Connection to the conversation

Published plantar fasciitis trial with assessments through week eight.

Low-Level Laser Therapy at 635 nm for Treatment of Chronic Plantar Fasciitis: A Placebo-Controlled, Randomized Study.

Reviewed 22 October 2026

Patients with selected symptomatic meniscal pathology had greater pain relief and improved Lysholm knee-function scores after low-level laser treatment.

Population / model

Patients with selected symptomatic meniscal pathology

Design & comparison

Double-blind, placebo-controlled low-level laser trial

Measured outcome

At four weeks, mean Lysholm score was 82.5 with laser versus 79.0 with placebo, from baselines of 77.0 and 77.2. Pain improvement favored laser (p<0.0001).

Design & scope

Selected symptomatic MRI-defined meniscal lesions; outcomes focused on pain and patient-reported knee function.

Connection to the conversation

Clinical symptom and function evidence in meniscal pathology.

Low-level laser therapy in meniscal pathology: a double-blinded placebo-controlled trial.

Reviewed 22 October 2026

BrdU-labeled proliferation and transwell migration increased after a single red-light or combined red/near-infrared exposure.

Population / model

Biceps tendon fibroblasts from two male surgical donors, aged 42 and 69; three independent experiments

Design & comparison

One 20-minute LED exposure: 630 nm, 10 mW/cm², 100 Hz, alone or with 880 nm, 40 mW/cm², 100 Hz.

Measured outcome

BrdU proliferation at approximately 24 hours: 2.21±0.76× control with red; 2.87±0.91× with combined light. Migration: 3.06±0.21× and 2.88±0.20× control. All p<0.05.

Design & scope

DNA-synthesis and migration assays in cultured human tendon-derived cells; donor count is distinct from experimental replicates.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Exploring the Effects of 630 nm Wavelength of Light-Emitting Diode Irradiation on the Proliferation and Migration Ability of Human Biceps Tendon Fibroblast Cells.

Reviewed 22 October 2026

A seven-day near-infrared regimen increased key components of the cartilage extracellular matrix.

Population / model

Healthy knee chondrocytes from one 46-year-old female donor; at least three independent experiments

Design & comparison

940 nm LED, 17 mW/cm² continuous, 180 seconds daily for seven days; calculated 3.06 J/cm² per session.

Measured outcome

Aggrecan protein by western blot reached 1.4× untreated control (p=0.001); sulfated glycosaminoglycan deposition increased (p<0.001). Across selected protocols, extracellular staining increased 1.3–1.5× for collagen-II and 1.5–2.1× for aggrecan.

Design & scope

The 940-nm result is a matrix-production endpoint. The staining ranges combine several favorable protocols and are assay-specific.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Near-infrared photobiomodulation stimulates viability and cartilage matrix synthesis in human chondrocytes.

Reviewed 22 October 2026

Cultured chondrocytes expressed more cartilage-associated genes and collagen-II while reducing collagen-I expression.

Population / model

Passage-3/4 chondrocytes from three-week-old rabbits; selected gene effects checked in human C28/I2 cells

Design & comparison

632.8 nm He-Ne laser, reported 12 mW over 0.91 cm²; eight minutes daily, reported 5.74 J/cm². Molecular assays followed one, three or five days.

Measured outcome

After five days: COL-II protein increased (p<0.05); Acan, Col2a1, Sox9 and CTNNB1 transcription increased (p<0.01). Matrix staining increased; secreted GAG was higher during days 8–12 after a six-day treatment course.

Design & scope

Cell-culture phenotype, gene expression and matrix measurements; fluence is reported as specified by the authors.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Promoted Viability and Differentiated Phenotype of Cultured Chondrocytes With Low Level Laser Irradiation Potentiate Efficacious Cells for Therapeutics.

Reviewed 22 October 2026

Treated osteoarthritic mice had lower cartilage-damage scores, stronger collagen-II staining and improved weight-bearing symmetry.

Population / model

Male C57BL/6 mice with surgically destabilized medial meniscus; five mice in the successful arm and five untreated OA controls

Design & comparison

940 nm LED, 44 mW/cm², reported 52 J/cm², 20 minutes, three times weekly for six weeks; started one week after surgery.

Measured outcome

OARSI histological damage score was 50% lower than untreated OA controls (p=0.03). Weight-bearing asymmetry improved by 31% (p=0.03). Collagen-II staining increased and MMP3-positive cells decreased.

Design & scope

Animal cartilage preservation assessed in stained tissue sections; companion rat-cell assays measured matrix synthesis and degradation genes.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Optimizing LED photobiomodulation parameters to prevent cartilage matrix degradation in knee osteoarthritis: in vitro and in vivo study.

Reviewed 22 October 2026

Near-infrared PBM added to standard burn care shortened the time to re-epithelialization compared with sham plus the same care.

Population / model

24 people with second-degree burns; 12 active and 12 sham

Design & comparison

904 nm superpulsed laser, 100 Hz, 200-nanosecond pulses; ten minutes, 1.1 J/session, twice weekly. Both groups received silver-sulfadiazine/paraffin-gauze care.

Measured outcome

Re-epithelialization: 8.3 versus 12.6 days (p<0.05), a calculated 4.3-day difference and 34% shorter time. Wound reduction, granulation and pain also improved.

Design & scope

Clinical skin-wound closure endpoint with concurrent standard care.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Effects of Photobiomodulation Adjunct Therapy via Superpulsed 904 nm Laser in Patients With Second-Degree Burns: Randomized Controlled Clinical Trial.

Reviewed 22 October 2026

Light-treated Achilles tendons had better fiber organization on histology and a collagen profile closer to healthy tissue.

Population / model

Male BALB/c mice: 13 healthy, 13 injured and 14 injured-plus-LED animals across experiments; representative histology plots generally four per group.

Design & comparison

Methods report 630/880 nm LEDs, 10/40 mW/cm², 100 Hz, 20 minutes, reported 12/48 J/cm², daily for two weeks beginning 24 hours after injury.

Measured outcome

Day-14 fiber-structure and fiber-arrangement scores improved versus injured untreated controls (p<0.005). Collagen-I:III ratio moved toward healthy levels; collagen-III and TGF-β1 decreased.

Design & scope

Microscopic tissue organization and collagen-expression endpoints after surgically induced Achilles injury in mice.

Connection to the conversation

Selected positive tendon histology and extracellular-matrix findings.

Efficacy of Light-Emitting Diode-Mediated Photobiomodulation in Tendon Healing in a Murine Model.

Reviewed 22 October 2026

Laser-treated rats had fewer inflammatory cells and lower selected inflammatory signals at 24 hours.

Population / model

60 male Wistar rats with induced acute knee inflammation

Design & comparison

808 nm laser, 4 J, at 50 or 100 mW; induced joint inflammation with injured untreated and uninjured controls.

Measured outcome

Inflammatory-cell counts and selected cytokine measures at 24 hours.

Design & scope

Papain-induced acute knee inflammation in male Wistar rats; responses were measured by cell counts and cytokine assays.

Connection to the conversation

Preclinical evidence for inflammatory modulation.

Effect of low-level laser therapy on the expression of inflammatory mediators and on neutrophils and macrophages in acute joint inflammation.

Reviewed 22 October 2026

Serum TNF-α was higher in people with ACL injury than in knee-healthy reference participants, both early after injury and around two years later.

Population / model

152 ACL-injured participants; 16 knee-healthy cytokine-reference participants

Design & comparison

Prospective follow-up after ACL injury; nonrandomized comparison with reference participants

Measured outcome

Serum TNF-α was 1.5-fold higher at a median 11 weeks after injury and 1.4-fold higher at the final visit, about 27 months after injury.

Design & scope

Prospective nonrandomized serum-biomarker study with 16 cytokine-reference participants and no preinjury measurements.

Connection to the conversation

Human evidence connecting joint injury with a circulating inflammatory signal.

An Anterior Cruciate Ligament Rupture Increases Levels of Urine N-terminal Cross-linked Telopeptide of Type I Collagen, Urine C-terminal Cross-linked Telopeptide of Type II Collagen, Serum Aggrecan ARGS Neoepitope, and Serum Tumor Necrosis Factor–α.

Reviewed 22 October 2026

An experimentally induced inflammatory stimulus temporarily reduced endothelium-dependent dilation in healthy volunteers.

Population / model

12 volunteers underwent brachial-dilation measurements; 6 underwent resistance-vessel testing

Design & comparison

Vaccine inflammatory stimulus in healthy people; vascular measurements before and after

Measured outcome

Endothelium-dependent responses were impaired at eight hours. Resistance-vessel responses recovered by 32 hours.

Design & scope

Acute vaccine-stimulus experiment, with conduit- and resistance-vessel physiology measured over hours.

Connection to the conversation

Experimental human evidence for the inflammation–vascular-function connection.

Acute systemic inflammation impairs endothelium-dependent dilatation in humans.

Reviewed 22 October 2026

Randomized, sham-controlled substudies measured higher aortic pulse-wave velocity after vaccine-induced inflammation; aspirin pretreatment attenuated the response.

Population / model

100 healthy people across the study’s substudies

Design & comparison

Randomized, double-blind, sham-controlled experiments using an acute vaccine inflammatory stimulus

Measured outcome

Aortic pulse-wave velocity increased by 0.43 m/s at eight hours.

Design & scope

Healthy volunteers in short-term inflammatory-challenge experiments; arterial stiffness measured by aortic pulse-wave velocity.

Connection to the conversation

Experimental human evidence linking inflammatory activity and arterial stiffness.

Acute systemic inflammation increases arterial stiffness and decreases wave reflections in healthy individuals.

Reviewed 22 October 2026

After ACL reconstruction, laser-treated rats had lower capsule IL-1β expression, less arthrogenic contracture and selected improvements in fibrotic changes.

Population / model

29 male rats after ACL reconstruction

Design & comparison

830 nm laser, 150 mW, 120 seconds daily after ACL reconstruction; outcomes at one and two weeks.

Measured outcome

Attenuated joint-capsule IL-1β expression at one week, alongside contracture and selected fibrosis outcomes.

Design & scope

Local joint-capsule, motion and fibrosis endpoints after surgery in an animal model.

Connection to the conversation

ACL-specific preclinical evidence for local inflammatory and fibrotic modulation.

Low-Level Laser Therapy Attenuates Arthrogenic Contracture Induced by Anterior Cruciate Ligament Reconstruction Surgery in Rats.

Reviewed 22 October 2026

At nine months, the active-treatment group required a lower mean levothyroxine dose to maintain normal thyroid-hormone concentrations. Thyroid echogenicity improved and anti-TPO levels were lower.

Population / model

43 patients with chronic autoimmune thyroiditis: 23 active, 20 placebo

Design & comparison

Ten sessions; 830 nm laser, 50 mW, reported fluence 707 J/cm². Medication withdrawal and retitration were investigator-managed.

Measured outcome

Mean required levothyroxine: 38.59 versus 106.88 µg/day at nine months (p<0.001). Anti-TPO p=0.043; echogenicity p<0.001.

Design & scope

Disease-specific, clinician-monitored protocol; medication decisions remained part of specialist care.

Connection to the conversation

Positive thyroid-function study with randomized placebo comparison.

Low-level laser in the treatment of patients with hypothyroidism induced by chronic autoimmune thyroiditis: a randomized, placebo-controlled clinical trial.

Reviewed 22 October 2026

PBM plus supplements was associated with favorable thyroid-marker changes over six months. In the PBM group, median anti-TPO declined from 523.60 to 88.25 IU/mL.

Population / model

74 women enrolled; 38 six-month completers: 18 PBM, 20 comparison

Design & comparison

820 nm, 200 mW; eight points, 20 seconds and 32 J/cm² per point; six sessions across three weeks. Both groups received selenium 100 µg/day, vitamin D3 when indicated, clinician-managed levothyroxine and dietary advice.

Measured outcome

Anti-TPO group median fell 83% from baseline to six months in PBM completers (within-group). The time-by-group analysis favored PBM for anti-TPO, TSH and FT4 (p<0.0001).

Design & scope

Patient-preference allocation; endpoint numbers describe the 38 completers. The 83% is a within-group change in medians.

Connection to the conversation

Published combined PBM, vitamin D3 and selenium protocol.

Efficacy of Combined Photobiomodulation Therapy with Supplements versus Supplements alone in Restoring Thyroid Gland Homeostasis in Hashimoto Thyroiditis: A Clinical Feasibility Parallel Trial with 6-Months Follow-Up.

Reviewed 22 October 2026

PBM plus supplements produced greater improvements in T3, T3/T4 ratio and anti-TPO than supplements alone. Mean weekly levothyroxine requirements declined by about half in the PBM group.

Population / model

350 patients: 210 PBM plus supplements; 140 supplements only

Design & comparison

850 nm laser, 100 mW, eight ultrasound-mapped points, 20 seconds/point, 28.57 J/cm²/point. Six sessions across three days. Selenium, vitamin D and iron replacement as indicated; concurrent levothyroxine care.

Measured outcome

At three months, weekly levothyroxine means changed 419.2→208.8 µg with PBM and 385.1→369.9 µg with supplements alone; final between-group p=0.03. T3/T4: 0.009→0.013 vs 0.008→0.008; between-group p=0.0001.

Design & scope

Nonrandomized comparison with co-interventions and clinician-managed medication.

Connection to the conversation

Positive clinical thyroid study, distinct from the D3/selenium feasibility study.

Impact of Photobiomodulation on T3/T4 Ratio and Quality of Life in Hashimoto Thyroiditis.

Reviewed 22 October 2026

A single duodenal light treatment lowered the Firmicutes-to-Bacteroidetes ratio at weeks one and two and increased Shannon diversity at week two.

Population / model

Male diabetic Goto–Kakizaki rats; five treated and four sham animals

Design & comparison

Surgically inserted duodenal OLED catheter; one ten-minute treatment. Red spectrum 600–700 nm; 1.33 mW total radiant power and 798 mJ total energy.

Measured outcome

F/B ratio decreased at weeks 1–2; Shannon diversity increased at week two (p<0.05). Beta diversity changed at week one (p<0.05) and two (p<0.01).

Design & scope

Internal, catheter-delivered light in a diabetic model. F/B describes a context-specific compositional shift.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

OLED catheters for inner-body phototherapy: A case of type 2 diabetes mellitus improved via duodenal photobiomodulation.

Reviewed 22 October 2026

Claudin-1 organization was better preserved, with greater crypt-cell proliferation and fewer inflammatory and apoptotic changes.

Population / model

Male C57BL/6 mice with DSS-induced colitis; four groups, five per group

Design & comparison

Red LED, 90 seconds daily on days 6–9 after DSS withdrawal, applied to ventral sites and beside the external anus.

Measured outcome

Better claudin-1 organization; increased epithelial proliferation and Annexin A1; lower IL-1β and IL-6 elevations, apoptosis, ulcers and inflammatory infiltration.

Design & scope

Intestinal histology, tight-junction protein organization and inflammatory markers during short-term experimental colitis recovery.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Red light-emitting diode treatment improves tissue recovery in DSS-induced colitis in mice.

Reviewed 22 October 2026

Treated mice had less gross tissue injury and neutrophil-associated inflammatory activity after chemically induced colitis.

Population / model

40 male Swiss mice across five randomized groups; eight per group

Design & comparison

One 940 nm LED exposure: four minutes, 4.05 J/cm², 270 mW total, 64.8 J; 16 cm² array 1 cm above the dorsal abdomen.

Measured outcome

At 18 hours after induction, gross-lesion score was 2 with LED versus 9.5 untreated. MPO activity was approximately 53% lower; IL-1β, TNF-α and IL-6 were reduced (p<0.05).

Design & scope

Acute acetic-acid colitis. Numerical lesion and MPO results are reported in the author’s thesis manuscript containing this study.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Light-emitting diodes at 940 nm attenuate colitis-induced inflammatory process in mice.

Reviewed 22 October 2026

Near-infrared treatment preserved microbial populations and supported intestinal crypt architecture, goblet cells and epithelial proliferation.

Population / model

BALB/c mice in exercise and antibiotic/lactic-acidosis models; complementary anaerobic fecal cultures

Design & comparison

980 nm abdominal irradiation, alone or with hindlimbs; ten sessions across 30 days in the exercise experiment. Authors targeted 0.1 J/cm² transmitted tissue dose.

Measured outcome

Caecal crypt architecture improved in the abdominal-treatment exercise group (p=0.0004). Under acidosis, crypt length, goblet-cell counts and epithelial proliferation increased; seven measured microbial phyla were preserved.

Design & scope

Histology, proliferation and microbiome endpoints in mouse stress models; stated tissue dose accounts for transmission through skin.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Photobiomodulation Strengthens Muscles via Its Dual Functions in Gut Microbiota.

Reviewed 22 October 2026

Laser-Doppler measurements showed an immediate increase in flow after wrist irradiation, with a larger increase during follow-up.

Population / model

20 healthy nonsmokers randomized to red or near-infrared light; mean age 30±8 years

Design & comparison

830 nm LED, 55 mW/cm², five minutes over the wrist; 16.5 J/cm². Palm flow monitored during exposure and for 20 minutes afterward.

Measured outcome

Near-infrared flow increased 27% during exposure (p=0.049) and 54% during the 20-minute follow-up (p=0.004), relative to baseline.

Design & scope

Acute human physiological measurement; response depended on wavelength and initial skin temperature.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Microcirculatory Response to Photobiomodulation—Why Some Respond and Others Do Not: A Randomized Controlled Study.

Reviewed 22 October 2026

An 890 nm LED treatment increased capillary blood-cell velocity and superficial skin flow compared with both placebo and warm packs.

Population / model

30 healthy volunteers randomized to active LED, sham LED or warm packs

Design & comparison

890 nm LED array in skin contact; 60 mW/cm² for 30 minutes, 108 J/cm² over 22.5 cm².

Measured outcome

Both capillary blood-cell velocity and skin-flow increases were greater with active treatment than either comparator (all p<0.05).

Design & scope

Immediate pre/post microcirculation measurements in healthy feet, with sham and heat comparisons.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

Immediate Effects of Monochromatic Infrared Energy on Microcirculation in Healthy Subjects.

Reviewed 22 October 2026

Whole-body red-light exposure increased laser-Doppler flow and plasma nitric-oxide precursor concentrations immediately after treatment.

Population / model

C57BL/6 mice; acute perfusion experiments with separate ischemia experiments

Design & comparison

670 nm LED, 50 mW/cm² for ten minutes; 30 J/cm². Whole-body exposure for the reported acute perfusion result.

Measured outcome

Flow increased from 453±45 to 1,097±75 Doppler intensity units, approximately 2.4× (p=0.0013). Plasma NO-precursor concentration increased from 19.7±3.0 to 29.9±3.9 nM (p=0.0469).

Design & scope

Acute mouse perfusion and biochemical measurements. Values are means±SD; the circulating measurement concerns NO-related precursor species.

Connection to the conversation

Selected positive finding; source-specific model and endpoint.

In Vivo Characterization of a Red Light-Activated Vasodilation: A Photobiomodulation Study.

Reviewed 22 October 2026