The study demonstrates that the heat of activation in a muscle twitch under extreme loads is about the same in magnitude and onset as at ordinary lengths.
No immediate clinical implications; leaves open translation of activation heat to human cardiac energetics.
Under extreme loads a stimulated muscle neither shortens nor develops tension. The heat production in a twitch is then rather less than one-half of its value with maximal shortening. Under such conditions the heat of shortening and the mechanical work are nil. The remaining heat, therefore, is heat of activation alone. It is about the same in magnitude and onset as the heat of activation at ordinary lengths.
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Archibald Vivian Hill (1950) studied this question.
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