Limiting exposure to blue light before going to bed is better for energy metabolism


Everyone knows that too much exposure to blue light is not good for vision. Not only that, using devices with lights at night can cause negative consequences for human health. Researchers from Japan have identified a new type of light that minimizes physiological changes during sleep.

In a study published in the journal Scientific Reports, researchers from the University of Tsukuba compared the effects of light-emitting diodes (LEDs), which are widely used for their energy-saving properties, with light-emitting diodes (LEDs). organic luminescence (OLED) during a physical process that occurs during sleep.

Polychromatic white LEDs emit large amounts of blue light, which has been linked to many negative health effects, including metabolic health. In contrast, OLEDs emit polychromatic white light containing less blue light. However, what the University of Tsukuba researchers wanted to solve was to compare changes in energy metabolism during sleep under the effects of nighttime exposure to LEDs and OLEDs.

Polychromatic white LEDs emit large amounts of blue light, which has been linked to many negative health effects, including metabolic health. In contrast, OLEDs emit polychromatic white light containing less blue light.

Professor Kumpei Tokuyama, lead author of the study, said: “Energy metabolism is an important physiological process that is altered by exposure to light. We hypothesized that compared with LEDs, OLED exposure would have a reduced impact on sleep structure and energy metabolism, similar to dim light.”

To test this hypothesis, the researchers exposed 10 male participants to LED, OLED, or dim light for four hours before they fell asleep in a metabolic chamber. The researchers then measured energy expenditure, body temperature, fat oxidation, and 6-sulfatoxymelatonin, a measure of melatonin levels, during sleep.

Professor Tokuyama explains: “The results partially confirmed our hypothesis. Although there was no effect on sleep structure, energy consumption and body temperature during sleep were significantly reduced after OLED exposure. Furthermore, fat oxidation during sleep was significantly lower after LED exposure compared with OLED.”

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In addition, fat oxidation during sleep was positively correlated with 6-sulfatoxymelatonin levels after OLED exposure, suggesting that the effect of melatonin activity on energy metabolism varies depending on the type of light exposure light.

“Therefore, night-time light exposure is associated with fat oxidation and body temperature during sleep. Our findings suggest that different types of light exposure are found,” said Professor Tokuyama. Specific light can influence weight gain, along with other physiological changes.”

Many occupations and activities involve exposure to artificial light before sleep. New research on the effects of different types of light on physical processes may facilitate the choice of alternative light sources. Choosing the right bedtime lighting can help minimize the negative consequences of nighttime light exposure. Furthermore, these findings enhance people’s knowledge about the role of light in energy metabolism during sleep.

Huong Giang (via: Science Daily)

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