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Message: <blockquote data-quote="Professional Student" data-source="post: 19016349" data-attributes="member: 788957">Fair enough. But the OP's original question was where does the heat produced by shivering come from. If only 50%-70% of the energy released from ATP hydrolysis is converted to mechanical energy, that means that nearly half of the energy is lost directly as heat, which is a massive amount of energy considering it's nearly the same amount of energy that's used to contract the muscles in the first place. I think it's important to make the distinction between mechanical energy and friction. The 50%-70% of the energy that is converted to mechanical energy is not all, or even primarily, lost as heat produced from friction. The energy is used to initiate movement and overcome the elasticity of the filaments themselves. In fact, I would argue that almost no heat production is the result of friction because the filaments are not actually sliding against one another.Imagine you are in a tree and are getting down by the means of a rope. Anyone that has ever slid down a rope knows that you can't do it, because the rope burns your hands very quickly because of the friction. If you want to get down without injury you must let go of the rope one hand at a time like your climbing a ladder, lowering yourself each time. The second example is almost identical to the sliding filament theory where the filaments are sliding in relation to each other but not actually against each other. That's a very interesting link you provided, I wish the whole content was free!</blockquote>

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