国产av不卡一区二区_欧美xxxx做受欧美_成年人看的毛片_亚洲第一天堂在线观看_亚洲午夜精品久久久中文影院av_8x8ⅹ国产精品一区二区二区_久久精品国产sm调教网站演员_亚洲av综合色区无码一二三区_成人免费激情视频_国产九九九视频

冬天來(lái)了，我們?cè)诼飞峡偪吹侥昀系娜舜┲窈竦囊路墒悄贻p人似乎并沒(méi)有這么怕冷。怕不怕冷和年齡有關(guān)系嗎？

Studies have found that the body’s response to cold changes significantly over a lifetime, with older people, especially men older than about 60, less able to maintain their core temperature at a given cold exposure than young people.

But a 2002 Finnish review in The International Journal of Sports Medicine also noted that older people had a reduced skin sensitivity to the cold and a reduced subjective perception of how cold it is, thereby making them slower to react to protect themselves and more vulnerable to death from hypothermia.

The skin’s protective reaction of constricting surface blood vessels is slower with age, and the cold-induced rise in metabolic rate is also weakened in older people, but the mechanism is unknown.

Cold sensitivity at any age is related to general ill health, especially an abnormally low body mass index and other factors like thyroid malfunction, so older people with these problems may feel more uncomfortable in the cold.

In mapping the temperature sensitivity of the body surface over the life span, a 1998 study reported in the journal Somatosensory & Motor Research found that the greatest age-related changes took place in the extremities, especially the feet, where sensitivity thresholds often become too large to measure.

（來(lái)源：紐約時(shí)報(bào)網(wǎng)站 實(shí)習(xí)生許雅寧 英語(yǔ)點(diǎn)津 Annabel 編輯）