間歇性斷食,可以喝咖啡嗎? - 健身

By Anonymous
at 2017-02-23T02:50
at 2017-02-23T02:50
Table of Contents
壞消息是,Patrick醫生在做專訪時,認為咖啡因會影響斷食效果[1][2]。
好消息是,也許沒有想像中的嚴重。
斷食只是降低胰島素?
除了胰島素,斷食期間還會降低呼吸商(respiratory quotient, RQ)。而低呼吸商是斷食對減脂最主要的貢獻。好消息是,有早期(1940s)研究指出,咖啡因不會對呼吸商有任何的影響[3]。
呼吸熵是什麼? (感謝lonelyheaven)
呼吸熵(RQ) = 吐出的二氧化碳 / 吸入的氧氣
當身體燃燒純葡萄糖,呼吸熵為1.0,表示吐出1份二氧化碳需要1份氧氣。而燃燒純脂肪酸時(身體進入酮態)。呼吸熵為0.66,表示吐出一份二氧化碳需要1.51份的氧氣。換言之,代謝脂肪需要更多的氧氣,而代謝碳水則否。
呼吸熵跟斷食有甚麼關係?
斷食重訓(Leangains)提倡人Martin說過 "斷食主要目的是降低呼吸熵(進入酮態燃脂)"。
斷食的結束與否(是否喝了咖啡),並不會瞬間改變呼吸熵。這也是為什麼在咖啡裡加點牛奶是被允許的。因為,這一點的牛奶不會將你的呼吸熵瞬間從0.66升高到1.0。這些牛奶的確會有影響,也許會在短時間內提高呼吸商到0.70或0.71,但絕對不會讓你持續多個小時的斷食前功盡棄。
加牛奶在咖啡? 這樣不會引起飢餓感嗎?
會的,所以我從來不加。我只在咖啡加鹽,這讓味道更順口
沒有黑咖啡,真的熬的過早上嗎?
可能會敖不過,安心地喝吧。黑咖啡對血糖、胰島素沒有任何明顯的影響。他基本上沒有
甚麼熱量,也不會對葡萄糖跟酮體的濃度有任何的貢獻。黑咖啡只是刺激神經系統並增加
肌肉中的鈣離子濃度而已,讓神經信號傳導更有效率。
--
等等,所以Patrick醫生倒底說了甚麼?
老實說,我不清楚。總之,我想喝咖啡就是了
--
[1] Let's Talk about Caffeine and Fasting
https://goo.gl/SX1jTj
[2] Dr. Patrick - Time restricted eating benefits
https://goo.gl/k9f5Kh
[3] The Effect of Various Amounts of Caffeine on the Gaseous Exchange and the
Respiratory Quotient in Man
https://goo.gl/XU9YsZ
--
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