A specific red light treatment made cartilage cells in a dish produce more of a key structural protein that helps keep joints healthy
Scientific Claim
Near-infrared light at 850 nm with 7 mW/cm² power density, applied daily for 240 seconds, significantly increased collagen type II expression in cultured human chondrocytes from a 46-year-old female donor
Original Statement
“Quantification of COL II staining intensity (Fig. 5 A) revealed that stimulated chondrocytes significantly increased COL II production in the ECM for most of the PBM protocols applied, except for 10 mW/cm² at 850 nm (continuous, daily, p < 0.001), which significantly reduced its expression”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The study directly measured collagen type II expression with statistical significance for this specific parameter, so 'significantly increased' is appropriate.
Evidence from Studies
Supporting (1)
Near-infrared photobiomodulation stimulates viability and cartilage matrix synthesis in human chondrocytes