Abstract
To elucidate structural and dynamical properties of biological water, pulsed NMR diffusion and spin-spin relaxation measurements have been conducted on rat and frog muscles in the relaxed, contracted, and exhausted state. In all three states the diffusion constant was approximately one-half that of ordinary water. These results are analyzed vis-a-vis recently reported studies of water in biological tissue and model systems. This analysis shows that our data are consistent with two fractions of muscle water: (1) a minor fraction representing the small percentage of water molecules hydrated to macromolecules with properties intermediate between ordinary water and ice, (2) a major fraction consisting of water with properties not unlike ordinary water, and the assumption that water protons are rapidly exchanging between the two fractions.
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