A specific red light treatment made cartilage cells in a dish produce less of a protein that's typically associated with damaged or healing cartilage
Scientific Claim
Near-infrared light at 850 nm with 7 mW/cm² power density, applied daily for 240 seconds, significantly reduced collagen type I expression in cultured human chondrocytes from a 46-year-old female donor
Original Statement
“COL I production was also observed in chondrocytes (Fig. 5 C), but its expression was significantly downregulated following PBM exposure with 4 mW/cm² at 850 nm (pulsed, every other day, p < 0.001); or 7 mW/cm² at 850 nm (continuous, daily, p = 0.025)”
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 I expression with statistical significance for this specific parameter, so 'significantly reduced' is appropriate.
Evidence from Studies
Supporting (1)
Near-infrared photobiomodulation stimulates viability and cartilage matrix synthesis in human chondrocytes