Key result
Exposure to 458 nm monochromatic light significantly increased the high-frequency component of heart rate variability and oral temperature compared to 550 nm light during the daytime.
Why the study?
Does 458 nm monochromatic light exposure affect autonomic nerve function and body temperature compared to 550 nm light?
Does 458 nm monochromatic light exposure affect autonomic nerve function and body temperature compared to 550 nm light?
Short-wavelength (458 nm) monochromatic light exposure affects the circadian rhythms of autonomic nerve function and body temperature more than 550 nm light.
Short-wavelength light may modulate daytime autonomic function and temperature; leaves open clinical relevance for circadian health pending larger studies.
We report the time-of-day-dependent effects of monochromatic lights at wavelength of 458 nm and 550 nm on human physiological and psychological parameters under the same irradiance density (9.8 µW/cm2 at eye level). We conducted an experiment in the daytime and nighttime on different days. Twelve subjects were selected, none of whom was either a morning-type or evening-type person, as assessed by the morningness/eveningness questionnaire. We found that 458 nm light exposure caused a greater high-frequency (HF)/(HF+low-frequency (LF)) component than did 550 nm light. The change of oral temperature (ΔTor) during exposure to 458 nm light was larger than that to 550 nm light in the daytime. Our findings indicate that short-wavelength monochromatic light can affect the circadian rhythms of autonomic nerve function and body temperature.
No takes yet. Share an insight, caveat, or question.
An et al. (2009) studied Healthy (n=12). 458 nm monochromatic light vs. 550 nm monochromatic light was evaluated on High-frequency (HF)/(HF+LF) component of heart rate variability in the daytime (p=<0.05). Exposure to 458 nm monochromatic light significantly increased the high-frequency component of heart rate variability and oral temperature compared to 550 nm light during the daytime.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: