People Innovation Excellence

The Energy Balance of Running

During the two years of its monthly appearance, this column has looked at many objects—cars, turbines, airplanes, windows, mobile phones, and nuclear reactors—made by humans. Today’s focus is on the human body, specifically the way it keeps itself cool.

Before the development of long-range projectile weaponry some tens of thousands of years ago, in Africa, our ancestors had only two ways to secure meat: by scavenging the leftovers of mightier beasts or by running down their own prey. Humans were able to occupy the second of those ecological niches thanks, in part, to two great advantages of bipedalism.

The first advantage is in how we breathe. A quadruped can take only a single breath per locomotive cycle because its thorax must absorb the impact on the front limbs. We, however, can choose other ratios, and that lets us use energy more flexibly. The second, and greater, advantage is in our extraordinary ability to regulate our body temperature, which allows us to do what lions cannot: to run long and hard in the noonday sun.

It all comes down to sweating. The two large animals we have mainly used for transport perspire profusely,…[Read more]


Published at : Updated
Leave Your Footprint

    Periksa Browser Anda

    Check Your Browser

    Situs ini tidak lagi mendukung penggunaan browser dengan teknologi tertinggal.

    Apabila Anda melihat pesan ini, berarti Anda masih menggunakan browser Internet Explorer seri 8 / 7 / 6 / ...

    Sebagai informasi, browser yang anda gunakan ini tidaklah aman dan tidak dapat menampilkan teknologi CSS terakhir yang dapat membuat sebuah situs tampil lebih baik. Bahkan Microsoft sebagai pembuatnya, telah merekomendasikan agar menggunakan browser yang lebih modern.

    Untuk tampilan yang lebih baik, gunakan salah satu browser berikut. Download dan Install, seluruhnya gratis untuk digunakan.

    We're Moving Forward.

    This Site Is No Longer Supporting Out-of Date Browser.

    If you are viewing this message, it means that you are currently using Internet Explorer 8 / 7 / 6 / below to access this site. FYI, it is unsafe and unable to render the latest CSS improvements. Even Microsoft, its creator, wants you to install more modern browser.

    Best viewed with one of these browser instead. It is totally free.

    1. Google Chrome
    2. Mozilla Firefox
    3. Opera
    4. Internet Explorer 9
    Close