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Exercising in the sun can promote bone health.
More sun exposure can help synthesize vitamin D and not easy to be deficient in calcium.
Exercising in the sun can help regulate your mood and strengthen your immune system.
Exercising in the sun can also help with weight loss. (Related reading: Sunbathing can help you lose weight in these ways, you may not know…
Have more sun exposure, and it is not easy to be depressed. (Related reading: 10 minutes of efficient sun exposure? Sufficient vitamin D supplementation…
And recently, a major study was published in BMC Medicine, a subsidiary of BMC, which found that sun exposure for 1.5 hours per day >, to minimize dementia risk.
Let’s have a look!
BMC: 1.5 hours of light, lowest risk of dementia
A major study was published April 25 in the medical journal BMC Medicine to assess whether outdoor light hours are associated with dementia risk< /strong>, and to investigate whether the optimal duration varies with clinical parameters.
Researchers conducted a prospective cohort study of 36,2094 participants and found that time outdoors is associated with dementia risk.
The data for the
study came from a prospective cohort of 362,094 UK Biobank participants.
Researchers investigated a potential nonlinear relationship between sun exposure and dementia risk.
The researchers then used a multivariate Cox proportional hazards regression model to estimate the hazard ratio (HR) for the association between sun exposure and dementia outcome, using the point of change as refer to.
As a result, after a median follow-up of 9.0 years, researchers found that 4149 people (1.15%) were diagnosed with dementia strong>.
And RCS showed a J-shaped relationship between outdoor light hours and dementia risk, with the lowest risk for the three change points (mean 1.5 hours/day, summer 2 hours/day, 1 hour/day in winter).
(Above: Estimated lowest point of dementia risk based on piecewise linear model was an average of 1.5 hours/day, 2 hours/day in summer, and 1 hour/day in winter)
Researchers conclude: SunshineThere was a J-shaped association between exposure and dementia risk.
Appropriate sunlight exposure can be effective in preventing dementia.
A significantincrease in dementia risk was observed at both low and high exposure times.
1.5 hours of optimal outdoor light
Additionally, multivariate Cox regression analysis showed that participants were fewer than those who received an average of 1.5 hours of outdoor light per day (adjusted HR= 1.184 95%CI 1.000-1.401) or more (adjusted HR=1.210, 95%CI 1.054-1.390 ) periods of sun exposure were associated with a higher risk of dementia.
Additionally, the researchers found that compared with participants who received 2 hours of outdoor light per day in summer, the duration was shorter (adjusted HR=1.182, 95%CI 1.008-1.387) or more (adjusted HR=1.086, 95%CI 0.973-1.213) time participants, tended to have a higher risk of developing dementia.
and compared to the reference group (average, 1.5 hours/day; summer, 2 hours/day; winter, 1 hour/day), low and high daylight hours Both groups were associated with a higher risk of dementia.
Additionally, the researchers found that compared to subjects younger than 60, participants aged 60 or older had more sun exposure time points than all populations studied. be longer. (This value is about 3 hours/day in summer and 1 hour/day in winter).
In conclusion, the results of this study suggest a J-type correlation between outdoor sun exposure and dementia risk.
Andreasonable sun exposure could prevent dementia in Britons living in high latitudes far from the equator.
As for the relationship between sun exposure and cognitive decline, researchers have made several hypotheses.
Sunshine helps synthesize vitamin D
Related studies indicate that vitamin D receptors are widely found in neurons and glial cells.
The research team believes that outdoor light can prevent dementia by the way it affects vitamin D in the body, because vitamin D is involved in several key pathways of brain health, including, for example, >Neurotransmission, neuroprotection, modulation of immune response, inhibition of pro-inflammatory agents and modulation of oxidative stress, etc.
Vitamin D levels in human tissues vary significantly with sunlight. So the researchers wanted to use sun exposure time to get a rough idea of vitamin D levels in older adults.
Light affects SCN suprachiasmatic nucleus and affects cognition
In addition to vitamin D status, researchers have found that ambient sunlight may also affect the suprachiasmatic nucleus (SCNsubchiasmatic nucleus) known as the body’s internal clock by regulating circadian rhythms and /strong>, is the central structure of the mammalian circadian rhythm regulation system, producing and regulating many biological rhythms such as sleep-wake, hormones, metabolism and reproduction. Sleep disturbances, circadian rhythm disturbances in hormones and behavior are common symptoms in the elderly, SCN The structural and functional changes of the above disorders are considered to be the neurobiological basis of the above disorders.), to affect the physiological and cognitive functions of the human body.
And one of the regulatory functions of SCN is to inhibit the conversion of serotonin into melatonin by the pineal gland. Studies have found that melatonin is associated with many mental and cognitive functions. Knowledge disabilities about .
Risk of excessive sun exposure
However, excessive sun exposure is also strongly associated with an increased risk of many negative human health outcomes, including, for example, sunburn, skin cancer (melanoma) , lip cancer and keratinocytes) and eye diseases (cataracts, UV keratitis) and more.
The absorption of UV light by the epidermal cells of the skin and eyes results in the production of reactive oxygen and nitrogen species that can harm living thingsMolecules, such as membrane lipids and DNA, UV light directly damages DNA by forming pyrimidine dimers.
Research finds that direct exposure of the human head to solar radiation in an upright position may raise brain temperature beyond core temperature because broad-spectrum light It can penetrate several millimeters of the skin and heat the underlying tissue.
There is an inverted U-shaped relationship between hyperthermia and cognitive performance.
Prolonged exposure to sunlight on the human head and neck can increase core temperature by 1°C, which can lead to cognitive decline. (It seems that it is more suitable to wear a hat if you are in the sun, or take a cool water head to cool down your head)
Additionally, researchers found that the association between sun exposure and cognitive decline was stronger in female and older participants.
Key Thin Dragon Says
1.5 hours of sun exposure is luxury for me.
For many beauty-loving girls, it’s terrifying.
According to this research data, most people don’t have enough sunshine, including myself, I spend most of my time indoors writing and live broadcasting, it seems that I really need more sunshine .
Moderate sunlight exposure can be of great help in preventing dementia.
Sunlight is also good for a good mood, boosts immune system function, and improves your sleep, so why not?
Get more sun, no problem except darkening.
If you’re worried, you can Scientific sun exposure 10 minutes of efficient sun exposure? Supplement with adequate vitamin D…)