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。1033Please respect copyright.ＰＥＮＡＮＡF8keIyAG7u
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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?1033Please respect copyright.ＰＥＮＡＮＡMslHeGOLqp
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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。1033Please respect copyright.ＰＥＮＡＮＡKpdlTNmDWW
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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。1033Please respect copyright.ＰＥＮＡＮＡCMdHIZGg62
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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。1033Please respect copyright.ＰＥＮＡＮＡmveuCChpUJ
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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1033Please respect copyright.ＰＥＮＡＮＡma8GeU9JHu
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70kg x 42.195km=1033Please respect copyright.ＰＥＮＡＮＡjtrgz4uJQu
2950kcal1033Please respect copyright.ＰＥＮＡＮＡVcbAKrnMnF
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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1033Please respect copyright.ＰＥＮＡＮＡWzXNVUh8kZ
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70kg x 1000 x 2% x 91033Please respect copyright.ＰＥＮＡＮＡuOctMVrCgM
=12600 kcal1033Please respect copyright.ＰＥＮＡＮＡsXiqUJjBk6
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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!1033Please respect copyright.ＰＥＮＡＮＡB4z358op7O
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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；1033Please respect copyright.ＰＥＮＡＮＡjAuPKErkeH
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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。1033Please respect copyright.ＰＥＮＡＮＡo4a0y5E1SP
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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。1033Please respect copyright.ＰＥＮＡＮＡpInAirC1p6
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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。1033Please respect copyright.ＰＥＮＡＮＡImHRp0H4Gm
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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/toc1033Please respect copyright.ＰＥＮＡＮＡDTNdQpoQuq
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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。1033Please respect copyright.ＰＥＮＡＮＡzWEc6HwCoa
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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/portfolio1033Please respect copyright.ＰＥＮＡＮＡjcp5RyJSEX
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Ref1:https://journals.physiology.org/doi/abs/10.1152/jappl.1963.18.2.3671033Please respect copyright.ＰＥＮＡＮＡCdbn3OPLSq
Ref2:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1859586/1033Please respect copyright.ＰＥＮＡＮＡiH4biHao10