I used my cyclocomputer's lap button this time. For the first half of the ride (lap 1), I used a very low gear and worked to keep my cadence as high as possible without bouncing in the saddle (I averaged 107 rpm). Coming back (lap 2), I used a harder gear, but my cadence was still quite high.
I seem to get thirsty faster when using a very high cadence. Low-gear, high cadence riding puts more stress on the cardiovascular system; maybe that's why. It was quite warm, too; temperature in the low 80s. That was certainly a factor.
But back to high-cadence riding: supposedly the word "spinster" to mean an unmarried woman comes from the fact that, at one time, one of the few respectable ways an unmarried woman could earn a living was by spinning. A cyclist riding at 100+ rpm could be called a "spinster", too!