科普專欄–薯不揀單 - 深入淺出–點解瘦削運動員都能夠跑畢馬拉松全程？

在長時間的運動下，脂肪會為身體帶來能源，支撐身體肌肉所需。馬拉松全程為42.195km，脂肪所提供的能源協助絕對不可或缺。1054Please respect copyright.ＰＥＮＡＮＡZxGE29adBi
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在這個前題下，為何為數不少的瘦削運動員都可以足夠應付長距離的馬拉松呢?1054Please respect copyright.ＰＥＮＡＮＡeElnaNfo9o
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（圖2）在此，我們嘗試一下利用數學角度，以卡路里的消耗量探討這一個問題。1054Please respect copyright.ＰＥＮＡＮＡTfkX6d6omW
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有研究確認(Ref1,2)，身體消耗的卡路里是與行走總距離有關，而非行走速度。1054Please respect copyright.ＰＥＮＡＮＡyGRb90fLC9
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他們最終得出的公式為每1kg行走1km平地就會消耗1卡路里。1054Please respect copyright.ＰＥＮＡＮＡ0iH9GlGekB
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如果我們假設1個70kg的男人跑一場馬拉松，所消耗的總卡路里就會為1054Please respect copyright.ＰＥＮＡＮＡY20BvkzpA3
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70kg x 42.195km=1054Please respect copyright.ＰＥＮＡＮＡfCorqwG2xc
2950kcal1054Please respect copyright.ＰＥＮＡＮＡMbT6szEBbP
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（圖3）身體的脂肪每克約可以提供9kcal，如果我們用上最極端的例子，負責儲存能源的體脂只佔身體重量2% (正常為10-32%)的話，所提供得到的能源就會是1054Please respect copyright.ＰＥＮＡＮＡ0RkeT2TcdS
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70kg x 1000 x 2% x 91054Please respect copyright.ＰＥＮＡＮＡT0rp8ykRMe
=12600 kcal1054Please respect copyright.ＰＥＮＡＮＡNIC2SW8S3h
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而基於每場馬拉松所消耗的卡路里僅為2950kcal關係，12600/2950 = 4.27，單憑身體脂肪所提供的能源，就足以應付4場馬拉松!1054Please respect copyright.ＰＥＮＡＮＡqFvQGXwKjC
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這個跑4次馬拉松的結果是以極低（儲存能量用的體脂2%）這個極端例子作計算，可以推算得到正常人的話絕對是遊刃有餘跑1場馬拉松；1054Please respect copyright.ＰＥＮＡＮＡbwwXkzQ0xL
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此計算方式是假設整場馬拉松是平地鋪設，沒有高低鈄坡。1054Please respect copyright.ＰＥＮＡＮＡO7DVIFBGK5
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（圖4）不過，魔鬼在細節，這集反應熱烈的話，下一集將會探討這個計算方式的漏洞以及馬拉松選手經常會遇到所謂Hit The Wall的問題。1054Please respect copyright.ＰＥＮＡＮＡ9otTdWzOBD
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如果想我快啲出文的話，請入去Penana網站科普專欄–薯不揀單俾一個like以及Bookmark，這對我非常之重要。1054Please respect copyright.ＰＥＮＡＮＡpWhRELKwkR
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Link: https://www.penana.com/story/66244/%E7%A7%91%E6%99%AE%E5%B0%88%E6%AC%84-%E8%96%AF%E4%B8%8D%E6%8F%80%E5%96%AE/toc1054Please respect copyright.ＰＥＮＡＮＡribBS6YSwU
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同時亦可以在Penana網站裡按「買一嚿/半嚿薯仔」，以課金的方式推動我繼續搜羅資料寫文，多謝。1054Please respect copyright.ＰＥＮＡＮＡd4kKbEiZNv
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https://www.penana.com/user/27349/%E8%96%AF%E4%BB%94%E8%81%9E%E8%8C%B1%E8%8E%89/portfolio1054Please respect copyright.ＰＥＮＡＮＡKCs09kUGaB
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有興趣接收科學資訊的話，歡迎follow IG: potatopigtongue。1054Please respect copyright.ＰＥＮＡＮＡI8d5fZgp4X
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Ref1:https://journals.physiology.org/doi/abs/10.1152/jappl.1963.18.2.3671054Please respect copyright.ＰＥＮＡＮＡi432xisUlu
Ref2:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1859586/1054Please respect copyright.ＰＥＮＡＮＡ3eFUOr8Z9d