消暑方法|烈日下用風扇仔變吹暖風易中暑 醫生教1個做法極速降溫6°C

文: 程家健
2024.06.30

日本消防局早前提醒,指手提風扇仔的鋰電池有機會在撞擊後損毀,如在掛在頸上時發生爆炸後果不堪設想。事實上,有醫生曾指出風扇仔吹出的氣流在炎熱天氣下可能變成暖風,汗水太快蒸發甚至有機會令體溫不降反升、導致中暑,建議用另一物品配合即可改善情況。

天氣持續炎熱,各種消暑方法自然份外受人注意。有日本網民於Twitter分享,指在戶外等高溫環境下利用手提迷你風扇送風,風扇吹出的氣流溫度有可能超過35度,情況與「焗桑拿」無異,極端情況甚至可引致中暑,消暑不成適得其反。

高溫下風扇劑吹頸或更易中暑

翻查資料,日本江東醫院副院長三浦邦久於2019年曾於電視節目《只有3成日本人知道的事》(《日本人の3割しか知らないこと》)表示,於氣溫高於35度的環境下使用迷你風扇降溫並非理想做法。他解釋指吹風扇時會將皮膚表面汗水蒸發,從而將熱力帶走,然而在烈日當空的高溫環境下吹風扇,可能令汗水在帶走熱能之前已被吹乾,或令體溫進一步上升而引致脫水,甚或中暑,

「在35度以上環境下開風扇,氣流其實與吹頭電風筒相差無幾;血液流經頸動脈時被加溫再流遍全身,體感溫度反而更高。」

三浦副院長又指,不少迷你風扇廣告都會示範將風扇掛胸前向頸吹,又或者掛在嬰兒車前面,認為兩種方法均不可取。要正確降溫他建議可以用毛巾濕水,如頸巾一般纏在頸上,已足以令體感溫度下降3.1度;如再配合風扇送風,體感溫度更可由34度下降至27.4度,亦即降溫足足6.6度。

6大防中暑方法  

家庭醫生林永和受訪時曾指出,當身體受熱過度,排汗等散熱機制不足以降溫,體溫就會不斷上升,當升至攝氏41度時,各種器官就會陸續失調,亦即中暑。患者初期會覺得非常口渴、疲倦、後尾枕痛、頭痛和皮膚泛紅等,若不及時處理,即有機會神志不清、語無倫次、全身抽筋,甚至死亡。小朋友、長者和長期病患者等均為中暑高危人士。

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