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Yesterday
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Men more sensitive to blue light

11 Nov 2017
The cornea, the transparent outermost layer of the eye, protects the eye from infection and physical injury.

Sensitivity to blue-enriched light is influenced by sex differences, such that males display a stronger response even to very low light levels, a recent study suggests. Moreover, sex differences also affect the acute benefits of bedtime blue light exposure such as sustained attention.

In the study, 32 participants (mean age 25.2±3.1 years; 50 percent female) were subjected to 1.5 hours of dim light (<8 lx), 2 hours of darkness, 2 hours of light exposure (40 lx) and 45 minutes of dim light (<8 lx), in sequence, until habitual sleep time. Both groups were matched according to age, ethnicity and body mass index.

Males preferred the 40-lx light delivered by a 6,500-K than by a 2,500-K fluorescent lamp (62.5 vs 37.5 percent). An opposite trend was observed for females (12.5 vs 87.5 percent, respectively), with the difference between the sexes reaching significance (p=0.004).

In a posthoc analysis, males were found to perceive the 6,500-K light as significantly stronger than the 2,500-K light (mean, 85.6±4.5 vs 67.7±5.4).

Light condition, specifically the 6,500-K light, significantly improved the median response time (p<0.005) and 10-percent fastest response time (p<0.001) exclusively in males. No such effect was observed in females.

Moreover, following exposure to 6,500-K light before bedtime, males had significantly higher frontal nonrapid eye movement slow-wave activity (2 to 4 Hz) sleep electroencephalogram power density than women (p<0.05).

“Collectively, the data indicate that sex differences in light sensitivity might play a key role for ensuring the success of individually-targeted light interventions,” said researchers.

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Most Read Articles
Yesterday
Long-term use of benzodiazepines is independently associated with lower diastolic and systolic blood pressure in ambulatory blood pressure monitoring (ABPM) among older but not younger patients, a study has found.
3 days ago
There appears to be a paradox in the context of smoking and the risk of psoriatic arthritis (PsA), such that current smoking increases the risk of developing PsA in the general population but protects against the same risk among patients with psoriasis, according to a study.
4 days ago
Moderate increases in physical activity levels may translate to significant reductions in both fasting glucose and HbA1c, a study has found.
Pearl Toh, 14 Nov 2017
Performing percutaneous coronary intervention (PCI) on culprit lesion only, rather than a multivessel PCI, reduces the 30-day composite risk of death or severe renal failure in patients with acute myocardial infarction (MI) complicated by cardiogenic shock and multivessel disease, according to the CULPRIT-SHOCK* study presented at the TCT 2017 Congress held in Denver, Colorado, US.