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Table 4 Sulfatoxymelatonin (aMT6s/crea), tryptophan (trp), and kynurenine (kyn) concentrations under office light (OL) and bright light (BL) exposure

From: Impact of a single, short morning bright light exposure on tryptophan pathways and visuo- and sensorimotor performance: a crossover study

Time aMT6s/crea [ng/mg] trp [μmol/L] kyn [μmol/L]
OL exposure BL exposure OL exposure BL exposure OL exposure BL exposure
Morning urine 20.8 (12.2–29.4) 14.0 (8.6–19.4) n.a. n.a.
7:15 a.m. 17.8 (10.9–24.7) 14.6 (8.7–20.5) 82.0 (77.2–86.9) 75.6 (70.3–81.0) 3.2 (2.8–3.7) 2.8 (2.5–3.0)
9:15 a.m. 12.1 (8.0–16.1)# 12.2 (7.3–17.1)#,* 69.5 (65.0–74.1)* 69.3 (64.9–73.7) 2.8 (2.6–3.0) 2.7 (2.4–2.9)
11:15 a.m. 8.4 (2.1–14.7)#,*,** 3.9 (2.4–5.4) #,*,** 66.5 (62.5–70.1)* 69.5 (65.9–73.1) 2.7 (2.4–3.0) 2.6 (2.3–2.8)
  1. Values represent mean values and 95% confidence intervals
  2. #p < 0.05 as compared to morning urine
  3. *p < 0.05 as compared to 7:15 a.m.
  4. **p < 0.05 as compared to 9:15 a.m.