Abstract
Light-induced melatonin suppression in children is reported to be more sensitive to white light at night than that in adults; however, it is unclear whether it depends on spectral distribution of lighting. In this study, we investigated the effects of different color temperatures of LED lighting on children's melatonin secretion during the night. Twenty-two healthy children (8.9 ± 2.2 years old) and 20 adults (41.7 ± 4.4 years old) participated in this study. A between-subjects design with four combinations, including two age groups (adults and children) and the two color temperature conditions (3000 K and 6200 K), was used. The experiment was conducted for two consecutive nights. On the first night, saliva samples were collected every hour under a dim light condition (<30 lx). On the second night, the participants were exposed to either color temperature condition. Melatonin suppression in children was greater than that in adults at both 3000 K and 6200 K condition. The 6200 K condition resulted in greater melatonin suppression than did the 3000 K condition in children (P < 0.05) but not in adults. Subjective sleepiness in children exposed to 6200 K light was significantly lower than that in children exposed to 3000 K light. In children, blue-enriched LED lighting has a greater impact on melatonin suppression and it inhibits the increase in sleepiness during night. Light with a low color temperature is recommended at night, particularly for children's sleep and circadian rhythm.
| Original language | English |
|---|---|
| Article number | e13942 |
| Journal | Physiological Reports |
| Volume | 6 |
| Issue number | 24 |
| DOIs | |
| Publication status | Published - Dec 2018 |
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All Science Journal Classification (ASJC) codes
- Physiology
- Physiology (medical)
Cite this
Melatonin suppression and sleepiness in children exposed to blue-enriched white LED lighting at night. / Lee, Sang il; Matsumori, Kouhei; Nishimura, Kana; Nishimura, Yuki; Ikeda, Yuki; Eto, Taisuke; Higuchi, Shigekazu.
In: Physiological Reports, Vol. 6, No. 24, e13942, 12.2018.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Melatonin suppression and sleepiness in children exposed to blue-enriched white LED lighting at night
AU - Lee, Sang il
AU - Matsumori, Kouhei
AU - Nishimura, Kana
AU - Nishimura, Yuki
AU - Ikeda, Yuki
AU - Eto, Taisuke
AU - Higuchi, Shigekazu
PY - 2018/12
Y1 - 2018/12
N2 - Light-induced melatonin suppression in children is reported to be more sensitive to white light at night than that in adults; however, it is unclear whether it depends on spectral distribution of lighting. In this study, we investigated the effects of different color temperatures of LED lighting on children's melatonin secretion during the night. Twenty-two healthy children (8.9 ± 2.2 years old) and 20 adults (41.7 ± 4.4 years old) participated in this study. A between-subjects design with four combinations, including two age groups (adults and children) and the two color temperature conditions (3000 K and 6200 K), was used. The experiment was conducted for two consecutive nights. On the first night, saliva samples were collected every hour under a dim light condition (<30 lx). On the second night, the participants were exposed to either color temperature condition. Melatonin suppression in children was greater than that in adults at both 3000 K and 6200 K condition. The 6200 K condition resulted in greater melatonin suppression than did the 3000 K condition in children (P < 0.05) but not in adults. Subjective sleepiness in children exposed to 6200 K light was significantly lower than that in children exposed to 3000 K light. In children, blue-enriched LED lighting has a greater impact on melatonin suppression and it inhibits the increase in sleepiness during night. Light with a low color temperature is recommended at night, particularly for children's sleep and circadian rhythm.
AB - Light-induced melatonin suppression in children is reported to be more sensitive to white light at night than that in adults; however, it is unclear whether it depends on spectral distribution of lighting. In this study, we investigated the effects of different color temperatures of LED lighting on children's melatonin secretion during the night. Twenty-two healthy children (8.9 ± 2.2 years old) and 20 adults (41.7 ± 4.4 years old) participated in this study. A between-subjects design with four combinations, including two age groups (adults and children) and the two color temperature conditions (3000 K and 6200 K), was used. The experiment was conducted for two consecutive nights. On the first night, saliva samples were collected every hour under a dim light condition (<30 lx). On the second night, the participants were exposed to either color temperature condition. Melatonin suppression in children was greater than that in adults at both 3000 K and 6200 K condition. The 6200 K condition resulted in greater melatonin suppression than did the 3000 K condition in children (P < 0.05) but not in adults. Subjective sleepiness in children exposed to 6200 K light was significantly lower than that in children exposed to 3000 K light. In children, blue-enriched LED lighting has a greater impact on melatonin suppression and it inhibits the increase in sleepiness during night. Light with a low color temperature is recommended at night, particularly for children's sleep and circadian rhythm.
UR - http://www.scopus.com/inward/record.url?scp=85058773235&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85058773235&partnerID=8YFLogxK
U2 - 10.14814/phy2.13942
DO - 10.14814/phy2.13942
M3 - Article
C2 - 30556352
AN - SCOPUS:85058773235
VL - 6
JO - Physiological Reports
JF - Physiological Reports
SN - 2051-817X
IS - 24
M1 - e13942
ER -