The Necessity of Near-Infrared Protection

Gale, Yohei Tanaka Lisa

doi:10.4172/2161-1076.1000150

Surgery

2013

DOI: 10.4172/2161-1076.1000150

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The Necessity of Near-Infrared Protection

Yohei Tanaka Lisa Gale¹

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Cited by 2 publications

References 14 publications

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Protection from Near-Infrared to Prevent Skin Damage

Tanaka¹,

Gale²

2015

OPJ

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Over half of the solar energy consists of near-infrared, and in addition to natural near-infrared, humans are increasingly exposed to artificial near-infrared from electrical appliances. Thus, we are exposed to tremendous amounts of near-infrared. Despite the wide prevalence of a variety of ultraviolet blocking materials, the necessity to protect against near-infrared has not been well recognized. To clarify the necessity to protect against near-infrared, we assessed cell viability of human fibroblast cells after water-filtered broad-spectrum near-infrared (1100 -1800 nm together with a water-filter that excludes wavelengths 1400 -1500 nm) treatment using 2 sets of transparent polycarbonate plates, one to block ultraviolet and the other to block both ultraviolet and near-infrared. The cell viability was significantly decreased after 10 rounds of near-infrared irradiation at 20 J⁄cm 2 in near-infrared treated cells without a protective polycarbonate plate and near-infrared treated cells using the polycarbonate plate to block only ultraviolet. Assuming that the cell viability of the non-irradiated control to be 100, the cell viability of the near-infrared treated cells without any protection was 0.2. The cell viability of the near-infrared treated cells with the polycarbonate plate to block only ultraviolet was 0.3, whereas both ultraviolet and nearinfrared protected cells retained a viability of 85.1. The results of this study indicate that protection from not only ultraviolet but also near-infrared should be considered to prevent skin damage.

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Protection from Near-Infrared to Prevent Skin Damage

Tanaka¹,

Gale²

2015

OPJ

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Biological Defenses against Ultra-Violet, Visible Light, and Near-Infrared Exposure

Tanaka¹,

Motomura²,

Jinno³

2016

OPJ

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Objective: Humans are increasingly exposed to artificial light and electromagnetic wave radiation, in addition to solar radiation. Many studies have shown the biological effects of ultra-violet and near-infrared exposure, but few have extensively investigated the innate biological defenses within human tissues against visible light and near-infrared exposure. Herein, we investigated spectral properties of endogenous human biological defenses against ultra-violet to near-infrared. Methods: A double-beam spectrophotometer (190 -2700 nm) was used to measure the transmission spectra of a saline solution used to imitate perspiration, and oil to imitate sebum, as well as human skin, blood, adipose tissue, and muscle. Results: Saline (thickness, 0.5 mm) blocked 27.5% -98.6% of ultra-violet, 13.2% -34.

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The Necessity of Near-Infrared Protection

Cited by 2 publications

References 14 publications

Protection from Near-Infrared to Prevent Skin Damage

Protection from Near-Infrared to Prevent Skin Damage

Biological Defenses against Ultra-Violet, Visible Light, and Near-Infrared Exposure

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