BBC Earth (Asia) - - Q&A -

Ex­er­cise di­verts blood from your liver and di­ges­tive sys­tem to your skele­tal mus­cles. Hor­mones tell the body to con­vert fat into glu­cose, re­duce the pain you feel and im­prove your mood. Mus­cles gen­er­ate lac­tic acid as a by-prod­uct of in­ten­sive ex­er­cise and, as this builds up, the pH of the blood around the mus­cles drops. This drop in pH even­tu­ally pre­vents the mus­cles con­tract­ing fur­ther. At this point, you need to rest to al­low the lac­tic acid to be metabolised.

1. Brain The brain makes neu­ro­trans­mit­ters, like sero­tonin, dopamine and GABA. This is part of the rea­son why the brain con­sumes more en­ergy dur­ing ex­er­cise.

3. Lungs The mus­cles of the ribcage as­sist the di­aphragm to pull in up to 15 times more oxy­gen than at rest. Breath­ing gets faster but also deeper.

2. Heart Adren­a­line lev­els rise, which stim­u­lates the heart to beat faster. Cap­il­lar­ies in the mus­cles open wider, in­creas­ing blood flow there by up to 20 times.

4. Skin Your two mil­lion sweat glands can pro­duce 1.4 litres of sweat per hour. Waste heat is car­ried away by the la­tent heat of evap­o­ra­tion as it dries.

5. Mus­cles As you ex­er­cise, the large mus­cles in your arms and legs squeeze the veins run­ning through them, pump­ing blood back to your heart.

6. Bones High-im­pact and weightlift­ing ex­er­cises stim­u­late bone for­ma­tion and re­duce the rate of cal­cium loss as we get older.

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